Primes LQM+ 20 User manual

LaserQualityMonitor LQM+
LQM+ 20, LQM+ 200/500, LQM+ HP (10/20 kW)
LaserDiagnosticsSoftware LDS
Revision 02/2019 EN
Operating Manual
35,0(6
Translation of the original instructions

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IMPORTANT!
READ CAREFULLY BEFORE USE.
KEEP FOR FUTURE USE.

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Table of contents
1 Basic safety instructions 7
2 Symbol explanations 9
3 About this operating manual 10
4 Conditions at the installation site 10
5 Introduction 10
5.1 System description .................................................................................................................10
5.2 Measuring principle ................................................................................................................12
5.3 Short overview installation .......................................................................................................13
6 Transport 14
7 Installation 14
7.1 Preparation and installation position ........................................................................................14
7.2 Manually aligning the LaserQualityMonitor LQM+ ....................................................................15
7.2.1 Alignment tool...........................................................................................................15
7.2.2 Manual alignment of the LQM+ 20 basic device and the LQM+ 200/500 with
1st attenuator ............................................................................................................15
7.2.3 Fine adjustment at the 1st attenuator .........................................................................16
7.3 Install the LaserQualityMonitor LQM+ ......................................................................................17
7.3.1 Install the LQM+ 20/200/500 without bottom plate ...................................................17
7.3.2 Install the LQM+ 200/500 with bottom plate .............................................................18
7.3.3 Install the LQM+ HP with bottom plate......................................................................19
8 Connect cooling circuit (LQM+ HP and LQM+ 500only) 20
8.1 Water quality ...........................................................................................................................20
8.2 Water pressure........................................................................................................................20
8.3 Humidity..................................................................................................................................21
8.4 Water connections and water flow rate....................................................................................22
8.4.1 LQM+ HP (10 kW and 20 kW)...................................................................................22
8.4.2 LQM+ 500 ................................................................................................................22
8.4.3 Remove the sealing plugs of the water connections..................................................23
9 Electrical connection 24
9.1 Connections............................................................................................................................24
9.2 Pin assignment .......................................................................................................................25
9.2.1 Power supply...........................................................................................................25
9.2.2 Inlet external trigger ..................................................................................................25
9.2.3 Outlet internal trigger.................................................................................................25
9.3 Safety facilities ........................................................................................................................26
9.3.1 Monitoring side access to the measuring objective and neutral-density filters............26
9.3.2 Temperature control..................................................................................................26
9.3.3 Safety interlock .........................................................................................................27
9.4 Connection to the PC and connect power supply ...................................................................28
10 Status display 29
11 Measurement 30
11.1 Safety instructions...................................................................................................................30
11.2 Selection and change of the measuring objective and the neutral density filter ........................31
11.2.1 Selection of the measuring objective .........................................................................31
11.2.2 Exchanging the measuring objective or the neutral density filter ................................32
11.2.3 Neutral density filter ..................................................................................................33

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11.3 Connect the LaserQualityMonitor LQM+ with the LaserDiagnosticsSoftware LDS ...................34
11.3.1 Connect device.........................................................................................................34
11.3.2 Change the network address of a connected device.................................................34
11.4 Set up the LaserQualityMonitor LQM+ with the LaserDiagnosticsSoftware LDS ......................35
11.4.1 Choose the beam pointing function...........................................................................35
11.4.2 Start beam search ....................................................................................................36
11.4.3 Log beam pointing stability .......................................................................................38
11.4.4 If the laser beam is not found ....................................................................................39
11.5 Perform an automatic caustic measurement............................................................................40
11.5.1 Choose automatic caustic measurement mode ........................................................40
11.5.2 Configure settings (Device control > Settings)........................................................41
11.5.3 Configure advanced settings (Device control > Advanced).....................................41
11.5.4 Starting an automatic caustic measurement..............................................................42
11.5.5 Measurement results display.....................................................................................42
11.6 Perform power measurement..................................................................................................43
11.6.1 Choose power measurement mode..........................................................................43
11.6.2 Configure settings (Device control)..........................................................................44
11.6.3 Starting a power measurement .................................................................................44
11.6.4 Measurement results display.....................................................................................45
12 Troubleshooting 46
13 Maintenance and service 47
14 Storage 47
15 Measures for the product disposal 47
16 Declaration of conformity 48
17 Technical data 49
18 Dimensions 50
18.1 LQM+ 20 ................................................................................................................................50
18.2 LQM+ 200/500 (without bottom plate) ....................................................................................51
18.3 LQM+ HP................................................................................................................................52
19 Appendix 53
19.1 Changing the factory setting on the LQM+ 20/200UV .............................................................53
19.2 HighYAG collimation module up to 6 kW .................................................................................55
19.2.1 Key data for the cooling system for the HighYAG collimation module ........................56
19.2.2 Schematic of the cooling system for the HighYAG collimation module.......................56
19.2.3 Remove/Install the HighYAG collimation module .......................................................57
19.2.4 Choosing the measuring objective with a HighYAG collimation module installed........58
19.3 IPG collimation module up to 20 kW .......................................................................................60
19.3.1 Possible combinations of the LaserQualityMonitor LQM+ HP (20 kW) with IPG
collimators ................................................................................................................61
19.3.2 The use of the measuring objectives 1:1 and 5:1 ......................................................62
19.3.3 Maximum Power.......................................................................................................62
19.4 Optical path in LQM+ HP (with IPG Collimator)........................................................................63
20 Formula and algorithms for raw beam back calulation 64

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PRIMES - The Company
PRIMES manufactures measuring devices used to analyze laser beams. These devices are employed for
the diagnostics of high-power lasers ranging from CO2lasers and solid-state lasers to diode lasers. A wave-
length range from infrared through to near UV is covered, offering a wide variety of measuring devices to
determine the following beam parameters:
• Laser power
• Beam dimensions and position of an unfocused beam
• Beam dimensions and position of a focused beam
• Beam quality factor M²
PRIMES is responsible for both the development, production, and calibration of the measuring devices. This
guarantees optimum quality, excellent service, and a short reaction time, providing the basis for us to meet all
of our customers’ requirements quickly and reliably.
PRIMES GmbH
Max-Planck-Str. 2
64319 Pfungstadt
Germany
Tel [phone]
[email protected]
www.primes.de

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1 Basic safety instructions
Intended use
The LaserQualityMonitor LQM+ is exclusively intended for measurements which are carried out in or nearby
the optical path of high power lasers. Please mind and adhere to the specifications and limit values given in
chapter 17 „Technical data“ on page 49. Other forms of usage are improper. The information contained in
this operating manual must be strictly observed to ensure proper use of the device.
Using the device for unspecified use is strictly prohibited by the manufacturer. By usage other than intended
the device can be damaged or destroyed. This poses an increased health hazard up to fatal injuries. When
operating the device, it must be ensured that there are no potential hazards to human health.
The device itself does not emit any laser radiation. During the measurement, however, the laser beam is
guided onto the device which causes reflected radiation (laser class 4). That is why the applying safety regu-
lations are to be observed and necessary protective measures need to be taken.
In measuring mode, the laser control’s safety interlock must be connected with the device.
Observing applicable safety regulations
Please observe valid national and international safety regulations as stipulated in ISO/CEN/TR standards as
well as in the IEC-60825-1 regulation, in ANSI Z 136 “Laser Safety Standards” and ANSI Z 136.1 “Safe Use
of Lasers”, published by the American National Standards Institute, and additional publications, such as the
“Laser Safety Basics”, the “LIA Laser Safety Guide”, the “Guide for the Selection of Laser Eye Protection”
and the “Laser Safety Bulletin”, published by the Laser Institute of America, as well as the “Guide of Control
of Laser Hazards” by ACGIH.
Necessary safety measures
DANGER
Serious eye or skin injury due to laser radiation
During the measurement the laser beam is guided on the device, which causes scattered or
directed reflection of the laser beam (laser class 4).
The LaserQualityMonitor LQM+ cannot be operated in any of the available configurations
without taking the following precautions. All precautions must be taken, even when the fiber
is in the collimator or fiber adapter.
X
Please take the following precautions.
If people are present within the danger zone of visible or invisible laser radiation, for example near laser
systems that are only partly covered, open beam guidance systems, or laser processing areas, the following
safety measures must be implemented:
• Connect the laser control’s safety interlock to the device. Check that the safety interlock will switch off
the laser properly in case of error.
• Please wear safety goggles adapted to the power, power density, laser wave length and operating
mode of the laser beam source in use.
• Depending on the laser source, it may be necessary to wear suitable protective clothing or protective
gloves.
• Protect yourself from direct laser radiation, scattered radiation, and beams generated from laser radiation
(by using appropriate shielding walls, for example, or by weakening the radiation to a harmless level).
• Use beam guidance or beam absorber elements that do not emit any hazardous substances when they
come in to contact with laser radiation and that can withstand the beam sufficiently.
• Install safety switches and/or emergency safety mechanisms that enable immediate closure of the laser
shutter.

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• Ensure that the device is mounted securely to prevent any movement of the device relative to the beam
axis and thus reduce the risk of scattered radiation. This in the only way to ensure optimum performance
during the measurement.
Employing qualified personnel
The device may only be operated by qualified personnel. The qualified personnel must have been instructed
in the installation and operation of the device and must have a basic understanding of working with high-
power lasers, beam guiding systems and focusing units.
Conversions and modifications
The device must not be modified, neither constructionally nor safety-related, without our explicit permission.
The device must not be opened e.g. to carry out unauthorized repairs. Modifications of any kind will result in
the exclusion of our liability for resulting damages.
Liability disclaimer
The manufacturer and the distributor of the measuring devices do not claim liability for damages or injuries
of any kind resulting from an improper use or handling of the devices or the associated software. Neither the
manufacturer nor the distributor can be held liable by the buyer or the user for damages to people, material
or financial losses due to a direct or indirect use of the measuring devices.

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2 Symbol explanations
The following symbols and signal words indicate possible residual risks:
DANGER
Means that death or serious physical injuries will occur if necessary safety precautions are not
taken.
WARNING
Means that death or serious physical injuries may occur if necessary safety precautions are not
taken.
CAUTION
Means that minor physical injury may occur if necessary safety precautions are not taken.
NOTICE
Means that property damage may occur if necessary safety precautions are not taken.
The following symbols indicating requirements and possible dangers are used on the device:
Components susceptible to ESD
Read and observe the operating instructions and safety guidelines before startup!
Further symbols that are not safety-related:
Here you can find useful information and helpful tips.
With the CE designation, the manufacturer guarantees that its product meets the requirements of
the relevant EC guidelines.
X
Call for action

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3 About this operating manual
This documentation describes the installation and configuration of the LaserQualityMonitor LQM+ and the
execution of measurements with the LaserDiagnosticsSoftware LDS.
The LaserDiagnosticsSoftware LDS must be installed on the PC for measuring operation of the LaserQuali-
tyMonitor LQM+. The basic version of the LaserDiagnosticsSoftware LDS is included in the scope of delivery
for the device.
For a detailed description of the software installation, file management and evaluation of the measured data,
please refer to the separate operating manual LaserDiagnosticsSoftware LDS.
4 Conditions at the installation site
• The device must not be operated in a condensing atmosphere.
• The ambient air must be free of organic gases.
• Protect the device from splashes of water and dust.
• Operate the device in closed rooms only.
5 Introduction
5.1 System description
The LaserQualityMonitor LQM+ is used to measure the beam properties of a beam source either by measur-
ing the open beam across several meters or with a fiber placed in a fiber holder or collimator.
Cw lasers can be measured and pulsed lasers can also be measured using an internal trigger.
The electronics and all optical components shown are installed in the LQM+ 20 basic device. The LQM+ 20
basic device can be supplemented by a front-end module with a beam splitter, an absorber and an align-
ment unit, which enables the use of the device even in the multikilowatt range. Fiber retainers, collimators,
neutral density filters as well as additional measuring objectives are available upon request.
The laser power can also be measured with the integrated power meters in the 1st and 2nd attenuator (only
LQM+ 500 and LQM+ HP).

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Fig. 5.1: Components of the LQM+ 20 basic device
Power meter
(LQM+ 500 only)
Alignment unit
1st Attenuator
Fig. 5.2: Components of the LQM+ 200/500
1st Attenuator
Alignment unit
Absorber with
power meter
2nd Attenuator with beam splitter
Fig. 5.3: Components of the LQM+ HP (10/20 kW)

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5.2 Measuring principle
Due to the very long measuring path of three to six Rayleigh lengths, a lot of measuring is needed to char-
acterize a collimated laser beam. The LaserQualityMonitor LQM+ therefore generates a compact caustic
inside the device by focusing the irradiated collimated laser beam with a focussing optic. In the process, the
focused beam is weakened as it passes through an integrated prisms and OD filter and then appears on the
CCD sensor, enlarged by a measuring objective.
The LaserDiagnosticsSoftware LDS software determines the radius, location, and orientation of the laser
beam by moving the prisms inside the device and measuring the two-dimensional power density distribution
repeatedly at various positions. The electronic integration time control of the CCD sensor expands the sys-
tem’s dynamic area. As a result of this, it generally isn’t necessary to adjust the filter during a measurement.
The following laser sources can be measured:
• All cw and pulsed laser sources in the wave length area of 340 – 360nm/515 – 545nm/1030 –
1090nm with medium power from approx. 1mW up to multikilowatt ranges with an M² ranging from 1
to approx. 50.
• The beam diameter at the aperture of the measuring system can vary in the range of 1.5mm to 15mm
(22mm only for LQM+ HP 20 kW), with divergence below 10mrad.
Focusing opticLaser beam Prisms
Measuring objective 5:1
Position 1
(illustrated inserted)
CCD sensorOD filter
Measuring objective 1:1
Position 2
(illustrated not inserted)
Prisms
Trigger
Absorber
Fig. 5.4: Optical assembly of the LQM+ 20 basic device
Scaning rangeRaw beam
Focusing optic Measuring objective
CCD sensor
Fig. 5.5: Measuring Principle

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5.3 Short overview installation
1. Installing the LaserDiagnosticsSoftware LDS on the computer
• Software is part of the scope of delivery
See separate Operating
Manual of the LaserDiagnos-
ticsSoftware LDS
2. Taking safety precautions Chapter 1 on page7
3. Prepare Installation (only during open beam measurement)
• Make preparations
• Set the installation position
• Align the device manually
Chapter 7 on page14
4. Connect the water-cooling (LQM+ HP and LQM+ 500 only)
• Connection diameter
• Observe flow rate
Chapter 8 on page20
5. Power supply
• Connect power supply
• Connect safety interlock
Chapter 9 on page24
6. Connection with the computer
• Via Ethernet or LAN
Chapter 9.4 on page28
7. Complete Installation (only during open beam measurement)
• Align the device with the LaserDiagnosticsSoftware LDS according to
chapter 11.4 on page35.
• Mount the device firmly in accordance with chapter 7 on page14
Chapter 11.4 on page35
8. Measure
• Follow the safety instructions
• Select and use the measuring objective and neutral-density filter
• Check the device‘s alignment with the LaserDiagnosticsSoftware LDS
• Perform a test measurement
Chapter 11 on page30

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6 Transport
WARNING
Risk of injury when lifting or dropping the device
Lifting and positioning heavy devices can, for example, stress intervertebral disks and cause
chronic changes to the lumbar or cervical spine. The device may fall.
X
Use a lifting device to lift and position the device.
NOTICE
Damaging/destroying the device
Optical components may be damaged if the device is subjected to hard shocks or is allowed
to fall.
X
Handle the device carefully when transporting or installing it.
X
To avoid contamination, cover the apertures with the provided lid or optical tape.
X
Only transport the device in the original PRIMES transport box.
NOTICE
Damage/destruction of the device caused by leaking or freezing cooling water
Leaking cooling water can damage the device. Transporting the device at temperatures
near or below freezing and without emptying the cooling circuit completely can damage the
device.
X
Empty the lines of the cooling circuit completely.
X
Don’t use any compressed air to empty the cooling circuit.
X
Even when the lines of the cooling circuit have been emptied, a small amount of residual
water will remain in the device at all times. This may leak out and end up inside the device.
Close the connector plug of the cooling circuit with the included sealing plug.
7 Installation
7.1 Preparation and installation position
Check the space available before mounting the device, especially the required space for the connection
cables and hoses (please see chapter 18 „Dimensions“ on page 50). The device must be firmly assembled
and must be mounted with screws (see chapter 7.3 on page17).
The LaserQualityMonitor LQM+ can be mounted and operated in any position. During open beam measure-
ment, the LaserQualityMonitor LQM+ must be aligned with the laser beam. The steps taken for installation
can be found in chapter 5.3 on page13.

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7.2 Manually aligning the LaserQualityMonitor LQM+
For an open beam measurement, the LaserQualityMonitor LQM+ must be aligned with the alignment tool to
the laser beam. The inlet aperture must be aligned centrally and at a right angle to the laser beam:
1. Align the LaserQualityMonitor LQM+ manually with a pilot laser and the alignment tool.
• The LaserQualityMonitor LQM+ is properly aligned when the pilot beam is centered through the holes in
the alignment tool.
2. Check the alignment as specified in chapter 11.4 on page35 with the alignment mode of the
LaserDiagnosticsSoftware LDS.
7.2.1 Alignment tool
An alignment tool is provided for the various LaserQualityMonitor versions that can be used for all aperture
diameters. After inserting the alignment tool into the aperture, it is fastened to a metal half ring with magnets.
Magnets Metal half ring
Fig. 7.1: Alignment tool for aligning the LQM+ versions with various apertures
7.2.2 Manual alignment of the LQM+ 20 basic device and the LQM+ 200/500 with 1st attenuator
LQM+ 20 basic device LQM+ 200/500 with 1st attenuator
Fig. 7.2: Alignment tool mounted on the LQM+ 20 basic device and the LQM+ 200/500 with 1st attenuator

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7.2.3 Fine adjustment at the 1st attenuator
With the 1st attenuator, the angle of incidence of the laser beam can be finely adjusted to the appropriate
angle with two integrated micrometer screws (see Fig. 7.3 on page16).
The laser beam can thus be aligned within the boundaries for the LaserQualityMonitor LQM+. The feedback
to change the beam position through fine adjustments is issued via the LaserDiagnosticsSoftware LDS (see
chapter 11.4 on page35).
+
-
+
-
Fig. 7.3: Micrometer screws on the 1st attenuator module for fine adjustment (for the example of the LQM+ 500)

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7.3 Install the LaserQualityMonitor LQM+
DANGER
Serious eye or skin injury due to laser radiation
For an open beam measurement, the LaserQualityMonitor LQM+ must be aligned to the
laser beam.
If the device is moved from its calibrated position, increased scattered or directed reflection
of the laser beam occurs during measuring operation (laser class 4).
X
When mounting the device, please ensure that it cannot be moved, neither due to an unin-
tended push or a pull on the cables and hoses.
7.3.1 Install the LQM+ 20/200/500 without bottom plate
285
120 60
44.3 60
150
Fig. 7.4: Fastening threaded holes LQM+ 20/200/500 without bottom plate
There are four M6 mounting threads on the underside of the device for fastening it onto a holder provided by
the customer. We recommend screws of the strength class 8.8.
4 threaded holes M6

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7.3.2 Install the LQM+ 200/500 with bottom plate
60
M6
120
Fig. 7.5: Fastening threaded holes LQM+ 200/500 with bottom plate
For the connection of a customer specific part, there are four threads M6 in the bottom plate. We recom-
mend screws of the strength class 8.8.
4 threaded holes M6

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7.3.3 Install the LQM+ HP with bottom plate
Fig. 7.6: Fastening bores and alignment threads LQM+ HP with bottom plate
4 mounting holes Ø 7.8mm
4 threaded holes M8 for the alignment

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8 Connect cooling circuit (LQM+ HP and LQM+ 500only)
DANGER
Fire hazard; Damage/Destruction of the device due to overheating
If there is no water cooling or a water flow rate which is insufficient, there is a danger of
overheating, which can damage the device or set it on fire.
X
Operate the device with a connected water cooling and a sufficient water flow rate only.
8.1 Water quality
NOTICE
Damage/Destruction of the device due to different chemical potentials
The parts of the device which get in contact with cooling water consist of copper, brass or
stainless steel. Connecting the unit to a colling curcuit containing aluminum components
may cause corrosion of the aluminum due to the different chemical potentials.
X
Do not connect the device on a cooling circuit in which aluminum components are installed.
• The device can be operated with tap water as well as demineralized water.
• Do not operate the device on a cooling circuit containing additives such as anti-freeze.
• Do not operate the device on a cooling circuit in which aluminum components are installed. Especially
when it comes to the operation with high powers and power densities, it may otherwise lead to corrosion
in the cooling circuit. In the long term, this reduces the efficiency of the cooling circuit.
• Should the cooling fail, the device can withstand the laser radiation for a few seconds. In this case,
please check the device as well as the water connections for damages.
• Large dirt particles or teflon tape may block internal cooling circuits. Therefore, please thoroughly rinse
the system before connecting it.
8.2 Water pressure
Normally, 2 bar primary pressure at the entrance of the absorber are sufficient in case of an unpressurized
outflow.
NOTICE
Damage/Destruction of the device due to overpressure
X
The maximum permissible water inlet pressure must not exceed 4bar.