THORLABS NPL Series User manual

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
NPL Series of
Nanosecond Pulsed
Lasers
User Guide

Nanosecond Pulsed Lasers 
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Table of Contents
Chapter 1Introduction..........................................................................................................................1
1.1.Parts List ..........................................................................................................................1
1.2.Description.......................................................................................................................1
Chapter 2Safety....................................................................................................................................3
2.1.Warnings and Cautions ..................................................................................................3
2.2.Precautions......................................................................................................................3
Chapter 3Quick Start Guide................................................................................................................4
Chapter 4Operation..............................................................................................................................5
4.1.Block Diagram .................................................................................................................5 
4.2.Power................................................................................................................................5
4.3.Interlock Circuit ...............................................................................................................6
4.4.Pulse Widths and Repetition Rates ...............................................................................7
4.5.Trigger Port......................................................................................................................7
4.6.Optical Output .................................................................................................................7
Chapter 5Specifications......................................................................................................................8
5.1.Optical Specifications.....................................................................................................8
5.2.Trigger Specifications..................................................................................................... 9
5.3.Power, Environmental, and Physical Specifications ...................................................9
5.4.Typical Pulse Width vs. Control Setting .....................................................................10
5.5.Typical Output Pulse Waveforms ................................................................................10
Chapter 6Mechanical Drawings.........................................................................................................16
6.1.NPL64A...........................................................................................................................16
6.2.NPL41B, NPL45B, NPL49B, NPL52B, and NPL64B ....................................................17
6.3.NPL41C, NPL45C, NPL52C, and NPL64C....................................................................18
Chapter 7Maintenance, Repair, and Fuses......................................................................................19
7.1.Maintenance...................................................................................................................19
7.2.Troubleshooting ............................................................................................................19
Chapter 8Declaration of Conformity.................................................................................................20
Chapter 9Thorlabs Worldwide Contacts..........................................................................................21

Nanosecond Pulsed Lasers Chapter 1: Introduction
Rev. F, January 7, 2019 Page 1
Chapter 1 Introduction
1.1. Parts List
Inspect the shipping container for damage. If the shipping container appears damaged, retain it until all contents
have been inspected and the unit has been mechanically and electrically tested. Verify receipt of all items:
1. Laser Head
2. +15 V Power Supply with Location-Specific Plug
3. 2 mm Flat Head Screwdriver (Item #s Ending in B or C)
4. Set of Keys for the Key Switch
5. Interlock Pin (Installed)
6. Two ECM225 Clamps
7. Quick Start Guide
1.2. Description
The NPL series of pulsed diode lasers are designed to provide a convenient, turn-key source of nanosecond pulse
trains. Model options are summarized in the table below and include different typical emission wavelengths, output
powers, repetition frequency range, and fixed or adjustable pulse widths.
Item # Typical Center
Wavelength Pulse Width Peak Output Power
Internal
Trigger
Max Rep.
Rate
NPL64A 640 nm ± 10 nm 10 ns 13 mW No 10 MHz
NPL41B 405 nm ± 10 nm 6 ns to 38 ns 38 mW
Yes 10 MHz
NPL45B 450 nm ± 10 nm 5 ns to 39 ns 75 mW
NPL49B 488 nm ± 10 nm 6 ns to 39 ns 50 mW
NPL52B 520 nm ± 10 nm 5 ns to 39 ns 30 mW
NPL64B 640 nm ± 10 nm 5 ns to 39 ns 50 mW
NPL41C 405 nm ± 10 nm
6 ns to 129 ns
1000 mW
No 50 kHz
NPL45C 450 nm ± 10 nm 1600 mW
NPL52C 520 nm ± 10 nm 1500 mW
NPL64C 640 nm ± 10 nm 1000 mW
Models with item numbers ending in A provide fixed-duration 10 ns pulses in response to a user-supplied trigger
input. Models with item numbers ending in B offer variable pulse width control and internal oscillators that trigger
the laser pulses at 1 MHz, 5 MHz, or 10 MHz in addition to user-triggered operation. Models ending in C offer higher
pulse energies, variable pulse width control, and user trigger input at repetition frequencies up to 50 kHz. The optical
output is a free-space beam with an integrated factory set collimated lens. Note that the shutter is permanently
attached.
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Nanosecond Pulsed Lasers Chapter 1: Introduction
Page 2 TTN122959-D02
The only differences in the back panels of the A, B, and C versions, shown below, are the pulse width and repetition
rate controls. A versions have neither, B versions have both pulse width and repetition rate control, and C versions
have only pulse width control. In these images, the shorting device (interlock pin) that ships installed in the Interlock
jack has been removed.
Figure 1 Back Panel of NPLxA Lasers
Figure 2 Back Panel of NPLxB Lasers
Figure 3 Back Panel of NPLxC Lasers
Interlock
Jack
Laser
Status
Key
Switch
Power
Jack
Trigger
Port
Repetition
Rate Control
Pulse Width
Control
Interlock
Jack
Laser
Status
Key
Switch
Power
Jack
Trigger
Port
Interlock
Jack
Laser
Status
Key
Switch
Power
Jack
Trigger
Port
Pulse Width
Control

Nanosecond Pulsed Lasers Chapter 2: Safety
Rev. F, January 7, 2019 Page 3
Chapter 2 Safety
All statements regarding safety of operation and technical data in this instruction manual will only apply when the
unit is operated correctly. If equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired. Only with written consent from Thorlabs may changes to single
components be carried out or components not supplied by Thorlabs be used.
2.1. Warnings and Cautions
Warning: Laser Radiation - This is a Class 3B laser system. Observe all
safety precautions and wear protective eyewear appropriate for this type of
device. Align system at lower output power if possible. Do not position device
so that is difficult to access the switch and interlock.
Caution – Use of controls or adjustments or performance of procedures other
than those specified herein may result in hazardous radiation exposure.
Caution: ESD Sensitive Component - The components inside this instrument are ESD sensitive. Take
all appropriate precautions to discharge personnel and equipment before making any connections to the
unit.
Caution: Components not Water Resistant - This instrument should be kept clear of environments where
liquid spills or condensing moisture are likely. It is not water resistant. To avoid damage to the instrument,
do not expose it to spray, liquids, or solvents.
Caution: Follow Intended Usage Guidelines
Inputs and outputs must only be connected with shielded connection cables.
The safety of any system incorporating the equipment is the responsibility of the assembler of the system.
If equipment is used in a manner not specified by the manufacturer, the protection provided by the
equipment may be impaired. Only with written consent from Thorlabs may changes to single components
be carried out or components not supplied by Thorlabs be used. There are no user serviceable components
inside this device.
2.2. Precautions
The following statement applies to the products covered in this manual, unless otherwise specified herein. The
statement for other products will appear in the accompanying documentation.
Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to
Part 15 of the FCC Rules, and meets all requirements of the Canadian Interference Causing Equipment Standard
ICES-003 for digital apparatus. These limits are designed to provide reasonable protection against harmful
interference in an industrial installation. This equipment generates, uses, and can radiate radio frequency energy
and, if not installed and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a particular installation. Thorlabs
is not responsible for any radio television interference caused by modifications of this equipment or the substitution
or attachment of connecting cables and equipment other than those specified by Thorlabs. The correction of
interference caused by such unauthorized modification, substitution or attachment will be the responsibility of the
user. The use of shielded I/O cables is required when connecting this equipment to any and all optional peripheral
or host devices. Failure to do so may violate FCC and ICES rules.
This product has been tested and found to comply with the limits according to IEC 61326-1 for using connection
cables shorter than 3 meters (9.8 feet).

Nanosecond Pulsed Lasers Chapter 3: Quick Start Guide
Page 4 TTN122959-D02
Chapter 3 Quick Start Guide
1. Mount the laser head as needed using the supplied ECM225 clamps and either imperial or metric
screws. After screwing the ECM225 clamps to any convenient base or post, such as one of
Thorlabs’ TR series optical posts, snap the clamps on to the bottom side of the NPL housing.
Firmly tighten the clamps using the locking screws. Figure 4 shows an example of an NPL laser
head mounted on an optical table.
2. Orient the laser to ensure the output beam will be safely contained.
3. Connect the power supply cable to the head, and then plug the power supply into mains power.
4. Make sure the shutter has been rotated to the closed position and interlock pin is in place at this
time. An external interlock circuit can be added later for more convenient integration of the
interlock safety feature.
5. Put on laser safety goggles if your situation requires them.
6. Turn the power switch on using the key switch.
7. The dual color LED indicator (red/blue) will blink until the laser temperature has stabilized. Initial
warm up can take 30 - 60 seconds. The indicator will then glow continuously when the laser
output is enabled. Note there is a four second delay between the time the indicator glows solid
and laser output is enabled. Note also that there will be no optical output unless the laser is
triggered. The B versions are triggered either externally or via internal oscillator, and the A and C
versions require an external trigger.
8. Ensure the laser is pointing in a safe direction, and then rotate the shutter to the open position.
For the B and C versions of the laser, note that adjusting the variable pulse width and/or
repetition rate controls will change the average output power.
Note the beam shape is asymmetric as is typical of solid-state diode lasers that do not use anamorphic
optical components to circularize the beam. Anamorphic elements, such as anamorphic prism pairs, are
available from Thorlabs.
Figure 4 Laser Head Mounted Using the Included ECM225 Clamps

Nanosecond Pulsed Lasers Chapter 4: Operation
Rev. F, January 7, 2019 Page 5
Chapter 4 Operation
4.1. Block Diagram
The block diagram in Figure 5 depicts the internal architecture of the laser head, which contains all of the pulser
drive electronics, safety interlocks, and trigger circuits, as well as the temperature stabilization system. The dual
color LED indicator (red/blue) is designed to be visible through most laser safety glasses. It blinks during the 30 -
60 s warm up and glows continuously while the laser is enabled.
Power is supplied by the included +15 V power supply. For the B versions of the laser, nothing else is required to
produce stable trains of nanosecond laser pulses. The A and C versions require only the application of an external
trigger. The elements unique to the B versions are noted in Figure 3 by the yellow blocks. The Repetition Rate
Control and Oscillators provide internally-generated trigger signals, which make it possible for the B versions to
produce stable trains of nanosecond pulses without an external trigger.

Figure 5 Block Diagram of the NPL Series Laser Head
4.2. Power
Power is supplied by the external, +15 V, wall-mounted DS15 Power Supply included with the unit and shown in
the left image of Figure 6. The power supply includes a location-specific plug. The mini-XLR type connector, which
uses a latching mechanism to prevent accidental pull-out, plugs into the laser head as shown in the right image of
Figure 6.
Figure 6 The DS15 Power Supply (left) connects to the back panel of the laser head (right).

Nanosecond Pulsed Lasers Chapter 4: Operation
Page 6 TTN122959-D02
The key switch controls power to all internal components. When the key switch is turned on, the temperature
stabilization system is activated. There is a 30 - 60 second warm up, during which time the LED indicator light blinks.
When the LED stops blinking, there is an additional four second delay and then laser is enabled. Note there will not
be any optical output until the interlock is satisfied, a trigger signal is supplied, and the shutter is opened.
4.3. Interlock Circuit
The laser is equipped with a phono-type interlock jack located on the back panel. To enable the laser source, a
short circuit must be applied across the terminals of the interlock connector. The shorting device (interlock pin)
installed in all units shipped from Thorlabs performs this function. Leave the shorting device installed unless using
an external safety circuit or other type of remotely controlled switch to enable laser output.
Making use of the Interlock feature requires the appropriate 2.5 mm phono-type plug, which is shown in the left
diagram of Figure 7 and is readily available through most electronics retailers. The plug should be wired to the
external safety circuit or switch and then plugged into the back panel’s interlock jack in place of the shorting
device. The electrical specifications of the interlock jack are listed in the following table, and the circuit schematic
describing how the interlock jack is connected inside the laser head is shown in the right diagram of Figure 7.
Parameter Specification
Interlock Switch Requirements Must be Normally Open Dry Contacts,
Apply no External Voltages to the Interlock Input
Type of Mating Connector 2.5 mm Mono Phono Jack
Open Circuit Voltage 5 VDC
(Center Pin is at 5 VDC, Ring is Ground)
The user’s safety circuit must be attached to the phono plug and wired such that the ring and center pin are
shorted when it is safe to enable the laser. The laser will be enabled when connection is closed. If it changes to
an open state, the laser source will turn off.
Figure 7 The interlock circuitry internal to the laser head (right) applies a 5 VDC bias across the
ring and center pin of the phono-type plug (left). An external circuit that shorts the ring and center
pin enables the laser.

Ring
Center Pin
Center Pin
+5.0 V
1.00 kΩ
10.0 kΩ
Ring
GND

Nanosecond Pulsed Lasers Chapter 4: Operation
Rev. F, January 7, 2019 Page 7
4.4. Pulse Widths and Repetition Rates
The models of the NPL series with item numbers ending in A and C require a user trigger input to the SMA connector
on the back panel. The A version supports rates up to 10 MHz. The C version supports rates up to 50 kHz. The
slowest supported edge transition time for the trigger signal is 1 ms. See the specifications in Chapter 5 for correct
voltage levels.
The models of the NPL series with item numbers ending in B offer additional controls for varying repetition rate
using internal oscillators as well as selecting a user trigger. Use the included 2 mm flathead screwdriver to operate
these controls. The photograph in Figure 8 shows three oscillator settings: A, B, and C. These positions provide
repetition frequencies of 1 MHz, 5 MHz, and 10 MHz, respectively. Position D allows the user to apply an external
signal to trigger the laser pulses. This control can be seen immediately to the right of the pulse width control in the
photo and can be adjusted with the same small screwdriver.
The models of the NPL series with item numbers ending in B and C offer controls for varying the pulse width. Use
the included 2 mm flathead screwdriver to operate this control as shown in Figure 8. The range of pulse widths for
each model are listed in the specifications table in Section 5.1. The pulse width control directly programs the
pulse generator and has 16 positions, which allows the pulse width to be adjusted in approximately 15 equal
increments. Plots of typical pulses and a plot of pulse width as a function of control setting are included in Section
5.5.2.
Figure 8 Use the included 2 mm flathead screwdriver to adjust the pulse width and repetition rate
controls.
4.5. Trigger Port
The Trigger In/Out port has dual function. If the internal oscillators are used (on B models), then the Trigger port
provides an output signal that is synchronized with the pulse generation. In the user-triggered mode, the SMA port
allows external trigger signals to drive the pulse generator. See the Specifications table in Chapter 5 for the correct
signals levels and port impedances.
4.6. Optical Output
The optical output is finally enabled by opening the safety shutter. This is done by rotating the flap
through 180°. Magnets will hold the flap either in the open or closed position. Note that the shutter is
permanently attached.

Nanosecond Pulsed Lasers Chapter 5: Specifications
Page 8 TTN122959-D02
Chapter 5 Specifications
5.1. Optical Specifications
Item # NPL64A NPL41B NPL45B NPL49B NPL52B NPL64B
Center Wavelength,
Typical
640 nm
± 10 nm
405 nm
± 10 nm
450 nm
± 10 nm
488 nm
± 10 nm
520 nm
± 10 nm
640 nm
± 10 nm
Pulse Width
(FWHM)
10 ns ± 1
ns1
6 ns ± 1 ns
(Min Setting)
38 ns ± 3 ns
(Max Setting)2
5 ns ± 1 ns
(Min Setting)
39 ns ± 3 ns
(Max Setting)2
6 ns ± 1 ns
(Min Setting)
39 ns ± 3 ns
(Max Setting)2
5 ns ± 1 ns
(Min Setting)
39 ns ± 3 ns
(Max Setting)2
5 ns ± 1 ns
(Min Setting)
39 ns ± 3 ns
(Max Setting)2
Internal Trigger No Yes (1, 5, or 10 MHz)
User Trigger
Frequency (Max)310 MHz
Pulse Energy, Max 0.12 nJ 1.50 nJ 3.00 nJ 2.00 nJ 1.20 nJ 2.00 nJ
Average Power, Max 1.2 mW 15 mW 30 mW 20 mW 12 mW 20 mW
Peak Power, Max 13 mW 38 mW 75 mW 50 mW 30 mW 50 mW
Beam Pointing
Accuracy4≤3°
Beam Divergence
(1/e2), Typical
1.5 mrad
(Major Axis)
0.5 mrad
(Minor Axis)
0.5 mrad
(Major Axis)
0.3 mrad
(Minor Axis)
0.5 mrad
(Major Axis)
0.25 mrad
(Minor Axis)
0.8 mrad
(Major Axis)
0.4 mrad
(Minor Axis)
1.5 mrad
(Major Axis)
0.5 mrad
(Minor Axis)
Collimating Lens C340TMD-B C610TME-A C340TMD-B
Item # NPL41C NPL45C NPL52C NPL64C
Center Wavelength,
Typical
405 nm
± 10 nm
450 nm
± 10 nm
520 nm
± 10 nm
640 nm
± 10 nm
Pulse Width
(FWHM)
6 ns ± 1 ns (Min Setting)
129 ns ± 5 ns (Max Setting)2
Internal Trigger No
User Trigger
Frequency (Max)350 kHz
Pulse Energy, Max 128 nJ 204 nJ 186 nJ 126 nJ
Average Power, Max 6.4 mW 10.2 mW 9.3 mW 6.3 mW
Peak Power, Max 1000 mW 1600 mW 1500 mW 1000 mW
Beam Pointing
Accuracy4≤3°
Beam Divergence
(1/e2), Typical
4.9 mrad
(Major Axis)
0.2 mrad
(Minor Axis)
2.4 mrad
(Major Axis)
0.14 mrad
(Minor Axis)
3.7 mrad
(Major Axis)
0.6 mrad
(Minor Axis)
10.2 mrad
(Major Axis)
0.5 mrad
(Minor Axis)
Collimating Lens C610TME-A C610TME-B
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1Pulse widths are of fixed duration. Please see Section 5.5.1 for a plot of a typical pulse.
2Pulse widths are adjustable over 16 discrete settings, from the minimum to the maximum specified widths. Please see Section 5.5.2 for plots
of typical pulses as well as a plot of typical pulse width vs. the pulse width control setting.
3The maximum supported edge transition time is 1 ms.
4Relative to a beam axis normal to the plane of the front panel.

Nanosecond Pulsed Lasers Chapter 5: Specifications
Rev. F, January 7, 2019 Page 9
5.2. Trigger Specifications
Parameter Specification
Coupling AC Coupled
Max Input Frequency5Item #s Ending in A or B 10 MHz
Item #s Ending in C 50 kHz
Input Voltage 200 mVpp to 2 Vpp
Input Impedance 5 kΩ
Output Voltage6900 mV (Hi-Z Load)
600 mV (50 ΩLoad)
Max Jitter720 ps RMS
100 ps Peak-to-Peak
Delay8From External Trigger Input to Optical Output 35 ns ± 5 ns
From Internal Trigger Output to Optical Output628 ns ± 5 ns
5.3. Power, Environmental, and Physical Specifications
Parameter Specification
DC Input Voltage Range to Laser Head 14 V to 16 V
DC Input Current to Laser Head 800 mA Max
AC Input Frequency Range to DS15 Power Supply 50 Hz - 60 Hz
AC Input Voltage to DS15 Power Supply 100 V to 240 V
Operating Temp Range 10 °C to 40 °C
Storage Temp Range 0 °C to 50 °C
Humidity Range (RH) 5% to 85%
Maximum Dimensions without ECM225 Clamps 139.6 mm x 61.5 mm x 48.7 mm
(5.49" x 2.42" x 1.92")
Maximum Dimensions with ECM225 Clamps 139.6 mm x 61.5 mm x 54.7 mm
(5.49" x 2.42" x 2.15")
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
5The maximum supported edge transition time is 1 ms.
6Only for item numbers ending in B.
7Applies to external triggering (all item numbers) and internal triggering (only item numbers ending in B).
8Trigger delay is measured between the SMA connector and the optical output at the lens.

Nanosecond Pulsed Lasers Chapter 5: Specifications
Page 10 TTN122959-D02
5.4. Typical Pulse Width vs. Control Setting
Figure 9 Typical pulse widths for the NPL41C and NPL41B. Pulse width has 16 different settings,
and actual pulse widths will vary from laser to laser. The NPL64A model does not have pulse
width control.
5.5. Typical Output Pulse Waveforms
5.5.1. NPL64A
Figure 10 Typical pulse for the NPL64A, which outputs pulses of fixed width. Signal features below
zero are artifacts introduced by the detector.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0
20
40
60
80
100
120
140
NPL41C
NPL41B
Typical Pulse Width vs. Control Setting
Pulse Width (ns)
Pulse Width Setting
30 40 50 60 70 80 90
0
2
4
6
8
10
12
14
NPL64A Typical Pulse
Optical Power (mW)
Time (ns)

Nanosecond Pulsed Lasers Chapter 5: Specifications
Rev. F, January 7, 2019 Page 11
5.5.2. NPL41B
Figure 11 Typical pulses for the NPL41B. The Pulse Width control on the back panel allows the pulse
width to be adjusted to one of 16 settings. (See Figure 2)
5.5.3. NPL45B
Figure 12 Typical pulses for the NPL45B. The Pulse Width control on the back panel allows the pulse
width to be adjusted to one of 16 settings. (See Figure 2)
30 40 50 60 70 80 90 100 110
0
5
10
15
20
25
30
35
40
Pulse Width
6 ns
8 ns
12 ns
18 ns
30 ns
37 ns
NPL41B Typical Pulses
Optical Power (mW)
Time (ns)
30 40 50 60 70 80 90 100 110
0
10
20
30
40
50
60
70
80
Pulse Width
4 ns
9 ns
14 ns
20 ns
27 ns
39 ns
NPL45B Typical Pulses
Optical Power (mW)
Time (ns)

Nanosecond Pulsed Lasers Chapter 5: Specifications
Page 12 TTN122959-D02
5.5.4. NPL49B
Figure 13 Typical pulses for the NPL49B. The Pulse Width control on the back panel allows the pulse
width to be adjusted to one of 16 settings. (See Figure 2)
5.5.5. NPL52B
Figure 14 Typical pulses for the NPL52B. The Pulse Width control on the back panel allows the pulse
width to be adjusted to one of 16 settings. (See Figure 2)
Signal features below zero are artifacts introduced by the detector.
30 40 50 60 70 80 90 100 110
0
5
10
15
20
25
30
35
40
45
50
55
Pulse Width
6 ns
8 ns
12 ns
20 ns
31 ns
39 ns
NPL49B Typical Pulses
Optical Power (mW)
Time (ns)
30 40 50 60 70 80 90 100 110
0
5
10
15
20
25
30
35
Pulse Width
4 ns
11 ns
19 ns
30 ns
38 ns
NPL52B Typical Pulses
Optical Power (mW)
Time (ns)

Nanosecond Pulsed Lasers Chapter 5: Specifications
Rev. F, January 7, 2019 Page 13
5.5.6. NPL64B
Figure 15 Typical pulses for the NPL64B. The Pulse Width control on the back panel allows the pulse
width to be adjusted to one of 16 settings. (See Figure 2)
Signal features below zero are artifacts introduced by the detector.
5.5.7. NPL41C
Figure 16 Typical pulses for the NPL41C. The Pulse Width control on the back panel allows the pulse
width to be adjusted to one of 16 settings. (See Figure 2)
30 40 50 60 70 80 90 100 110
0
5
10
15
20
25
30
35
40
45
50
55
Pulse Width
4 ns
11 ns
19 ns
30 ns
38 ns
NPL64B Typical Pulses
Optical Power (mW)
Time (ns)
0 25 50 75 100 125 150 175 200
0
250
500
750
1000
1250
1500
Pulse Width
6 ns
31 ns
55 ns
80 ns
105 ns
129 ns
NPL41C Typical Pulses
Optical Power (mW)
Time (ns)

Nanosecond Pulsed Lasers Chapter 5: Specifications
Page 14 TTN122959-D02
5.5.8. NPL45C
Figure 17 Typical pulses for the NPL45C. The Pulse Width control on the back panel allows the pulse
width to be adjusted to one of 16 settings. (See Figure 3)
5.5.9. NPL52C
Figure 18 Typical pulses for the NPL52C. The Pulse Width control on the back panel allows the pulse
width to be adjusted to one of 16 settings. (See Figure 3)
0 25 50 75 100 125 150 175 200
0
200
400
600
800
1000
1200
1400
1600
1800
Pulse Width
6 ns
31 ns
56 ns
80 ns
105 ns
129 ns
NPL45C Typical Pulses
Optical Power (mW)
Time (ns)
0 25 50 75 100 125 150 175 200
0
200
400
600
800
1000
1200
1400
1600
1800
Pulse Width
6 ns
31 ns
56 ns
81 ns
105 ns
129 ns
NPL52C Typical Pulses
Optical Power (mW)
Time (ns)

Nanosecond Pulsed Lasers Chapter 5: Specifications
Rev. F, January 7, 2019 Page 15
5.5.10. NPL64C
Figure 19 Typical pulses for the NPL64C. The Pulse Width control on the back panel allows the pulse
width to be adjusted to one of 16 settings. (See Figure 3)
0 25 50 75 100 125 150 175 200
0
200
400
600
800
1000
1200
Pulse Width
5 ns
31 ns
54 ns
80 ns
104 ns
129 ns
NPL64C Typical Pulses
Optical Power (mW)
Time (ns)

Nanosecond Pulsed Lasers Chapter 6: Mechanical Drawings
Page 16 TTN122959-D02
Chapter 6 Mechanical Drawings
6.1. NPL64A
Figure 20 Mechanical Drawing of the NPL64A

Power Key
Switch
14.0 mm
(0.55") 22.9 mm
(0.90")
6.4 mm
(0.25")
10.0 mm
(0.39") 61.5 mm
(2.42")
54.7 mm
(2.15")
57.2 mm
(2.25")
105.6 mm
(4.16")
139.6 mm
(5.49")
Includes Two ECM225 Mounting Clamps
with Three M4 (#8) Counterbores in Each
2.5 mm Phono-Type
Interlock Jack
Laser Enabled
Light
DS15 Power
Supply Jack
±15 VDC
Trigger In/Trigger Out
SMA Connector
C340TMD-B
Lens
SM05 (0.535"-40)
Series Internal Thread
Clamp Locking
Screw 2 mm (5/64") Hex
44.6 mm
(1.75")
48.7 mm
(1.92")
17.8 mm
(0.70")

Nanosecond Pulsed Lasers Chapter 6: Mechanical Drawings
Rev. F, January 7, 2019 Page 17
6.2. NPL41B, NPL45B, NPL49B, NPL52B, and NPL64B
Figure 21 Mechanical Drawing for Item Numbers Ending in B
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Nanosecond Pulsed Lasers Chapter 6: Mechanical Drawings
Page 18 TTN122959-D02
6.3. NPL41C, NPL45C, NPL52C, and NPL64C
Figure 22 Mechanical Drawing for Item Numbers Ending in C