THORLABS PMTSS Series User manual

PMTSS Series
Photomultiplier Tube
User Guide

Copyright August 9 , 2016 Thorlabs, Inc.Allrights reserved.
Information in this document is subject to change without notice. No part of this publication may be repro duced, stored in aretrieval system, or
transmitted in any form or any means electronic or mechanical, including photocopying and recording for any purpose other than the purchaser's
personal use without the written permission of Thorlabs, Inc.
Thorlabs, Inc.
108 Powers Court
Sterling, VA 20166
703-651-1700

PMTSS
Table of Contents
Chapter 1 Warning Symbol Definitions.............................................................................................1
Chapter 2 Safety...................................................................................................................................2
Chapter 3 Description .........................................................................................................................3
3.1. Front Panel Overview................................................................................................... 3
3.2. Back Panel Overview.................................................................................................... 4
Chapter 4 Getting Started...................................................................................................................5
4.1. Ordering Codes ............................................................................................................ 5
4.2. Unpacking and Inspection ........................................................................................... 5
4.3. Setting up PMTSS Series ............................................................................................. 6
4.3.1. Preparation............................................................................................................................6
4.3.2. Expanding the Detection Channels (PMTSS2).....................................................................6
Chapter 5 Maintaining the PMTSS Series.......................................................................................10
5.1. Storing the PMTSS Series.......................................................................................... 10
Chapter 6 Connection and Programming....................................................................................... 11
Chapter 7 Performance Plots...........................................................................................................12
Chapter 8 Specifications................................................................................................................... 13
8.1. General Specifications............................................................................................... 13
8.2. Performance Specifications....................................................................................... 13
Chapter 9 Mechanical Drawing ........................................................................................................14
Chapter 10 Cable Wiring Diagram .....................................................................................................17
Chapter 11 Certifications and Compliance.......................................................................................18
Chapter 12 Warranty............................................................................................................................ 19
Chapter 13 Regulatory ........................................................................................................................20
13.1. Waste Treatment is Your Own Responsibility.......................................................... 20
13.2. Ecological Background.............................................................................................. 20
Chapter 14 Thorlabs Worldwide Contacts........................................................................................ 21

PMTSS Chapter 1: Warning Symbol Definitions
Rev B, August 9, 2016 Page 1
Chapter 1 Warning Symbol Definitions
Below is a list of warning symbols you may encounter in this manual or on your device.
Symbol
Description
Direct Current
Alternating Current
Both Direct and Alternating Current
Earth Ground Terminal
Protective Conductor Terminal
Frame or Chassis Terminal
Equipotentiality
On (Supply)
Off (Supply)
In Position of a Bi-Stable Push Control
Out Position of a Bi-Stable Push Control
Caution: Risk of Electric Shock
Caution: Hot Surface
Caution: Risk of Danger
Warning: Laser Radiation
Caution: Spinning Blades May Cause Harm

PMTSS Chapter 2: Safety
Page 2 TTN043089-D02
Chapter 2 Safety
All statements regarding safety of operation and technical data in this user guide will only apply when the unit is
operated correctly. Please read the following warnings and cautions carefully before operating the device.
CAUTION
DO NOT use the device for anything other than its intended use.

PMTSS Chapter 3: Description
Rev B, August 9, 2016 Page 3
Chapter 3 Description
Thorlabs’ PMT (Photomultiplier Tube) modules are designed for easy integration of PMT detection into imaging
systems and are ideal for laser scanning microscopy. These side-on PMTs have a broadband spectral response
(185 –900 nm), gain > 107, and a fast response time (1.4 ns). The modules use a Cockcroft-Walton circuit with low
power consumption. A BNC connector supplies the output data from the detectors. The PMTSS series consist of
PMTSS (Stand-Alone PMT), PMTSS2 (Two-Channel PMT), and PMTSS2-SCM (Single-Channel Add-on PMT).
The PMTSS2 module consists of two multi-alkali standard sensitivity PMTs, a DFM dichroic filter cube insert, and
a base. The filter insert enables easy exchange of dichroic mirror/emission filter sets. This configuration enables
dual-channel detection of signals at two different wavelengths. The input port of the filter block features SM1 (1.035”-
40) threading, which is directly compatible with a wide array of Thorlabs’ SM1 Lens tubes and fiber collimation
adapters. The module has an SMA fiber connector for attaching an SMA-terminated multimode fiber patch cable.
The base of the module is equipped with 1/4" (M6) slots for attachment to an imperial or metric optical table or
breadboard. Due to the weight of the unit, we recommend placing it on a table or breadboard. Add on the PMTSS2-
SCM module to the PMTSS2 module to increase the number of detection channels. The two-channel PMTSS2
modules are expandable to up to eight detection channels.
The PMTSS is a stand-alone photosensor module in a compact aluminum housing. It is a multi-alkali PMT detector
without any filter block and base. It has a C-mount internal thread. For compatibility with Thorlabs’ SM1 lens tubes,
convert the C-mount thread to external SM1 threads using Thorlabs’ SM1A9 C-mount to SM1 adapter. For
compatibility with a 30 mm cage system, attach an SM1T2 externally SM1-threaded coupler to the SM1A9, which
is compatible with any of our SM1-threaded 30 mm cage plates.
3.1. Front Panel Overview
Detector Element
Internal C-Mount Thread
(1.00-32-2A)

PMTSS Chapter 3: Description
Page 4 TTN043089-D02
3.2. Back Panel Overview
Serial Number
PMT Pre-AMP Bulkhead
Internal Power
BNC Output

PMTSS Chapter 4: Getting Started
Rev B, August 9, 2016 Page 5
Chapter 4 Getting Started
This section is provided for those interested in getting the PMT up and running quickly.
4.1. Ordering Codes
Ordering Codes
Description
PMTSS
Stand-Alone Photomultiplier Tube
PMTSS2
Dual-Channel Photomultiplier Tube
PMTSS2-SCM
Single-Channel Add-On Photomultiplier Tube
4.2. Unpacking and Inspection
Open the package, and carefully remove the PMT and its accessories. The table lists the standard accessories
shipped with the device.
Name
Quantity
PMTSS
PMTSS2
PMTSS2-SCM
PMT
1
2
1
Male M8 x 1
Connectors with
Colored Wire
Leads
1
2
1
M8 x 1 Extension
Cords
1
2
1
Fiber Patch Cable
-
1
-
PMT Module
Mount
-
-
1
PMT 2 Channel
Assembly
-
1
-
C-Mount Cap
1
-
-
Inspect the device and its accessories for any missing parts or damage. If there is any problem, please contact
Thorlabs by Phone: [phone] or email: [e-mail].

PMTSS Chapter 4: Getting Started
Page 6 TTN043089-D02
4.3. Setting up PMTSS Series
WARNING
DO NOT switch on the light source until the setup is complete. Use proper eye and skin
protection for the corresponding wavelength in use while setting up the photomultiplier tube to
detect hazardous wavelengths, such as UV, blue lights, and other high intensity radiations.
WARNING
Use proper eye and skin protection for the corresponding wavelength in use while operating
the photomultiplier tube with hazardous wavelengths, such as UV, blue lights, and other high
intensity radiations.
CAUTION
DO NOT expose the photomultiplier tube to strong light sources (especially UV). They can
temporarily increase the noise in the signal.
4.3.1. Preparation
1. Mount the PMT on your optical table or application.
2. Connect the PMT Pre-Amp Bulkhead Internal Power cable Pin 1 to a standard power supply and Pin 2
(0.25 –1.2 V) to a voltage control unit.
3. Connect the output signal to a data acquisition system.
4. Align the light source to the PMT input, and switch on the light source.
5. Remove the C-Mount cap (PMTSS module).
6. Vary the voltage in the voltage control unit to control the PMT gain.
4.3.2. Expanding the Detection Channels (PMTSS2)
Add the PMTSS2-SCM module to the PMTSS2 module to increase the number of detection channels. The PMTSS2
module is expandable to up to eight detection channels.
CAUTION
DO NOT switch on the photomultiplier tube module while installing additional detection channels.
Stray lights may temporarily increase the noise in the signal and may damage the detector element.

PMTSS Chapter 4: Getting Started
Rev B, August 9, 2016 Page 7
1. Use a 2 mm hex key to remove the setscrews (2x) from the PMT Face Plate, and remove the Fiber Couple
Lens Tube.
2. Slide the PMT Face Plate out of the assembly.
Setscrews
PMT Face Plate
Fiber Couple
Lens Tube
PMT Face Plate

PMTSS Chapter 4: Getting Started
Page 8 TTN043089-D02
3. Use the 2 mm hex key to remove the setscrews (2x) from the PMTSS2-SCM module, and slide the
PMTSS2 detection block onto the PMTSS2-SCM.
4. Use the 2 mm hex key to fasten the setscrews (2x) into the PMTSS2-SCM.
PMTSS2
Detection
Block
PMTSS2-SCM
Setscrews
Setscrews

PMTSS Chapter 4: Getting Started
Rev B, August 9, 2016 Page 9
5. Slide the PMT Face Plate onto the PMTSS2-SCM detection block.
6. Mount the Fiber Couple Lens Tube on the PMT Face Plate, and use the 2 mm hex key to fasten the
setscrews into the PMT Face Plate.
The setscrews secure the Fiber Couple Lens Tube.
7. Mount the unit on the optical table.
8. Attach an SMA-terminated multimode fiber patch cable to the Fiber Couple Lens Tube.
PMT Face Plate

PMTSS Chapter 5: Maintaining the PMTSS Series
Page 10 TTN043089-D02
Chapter 5 Maintaining the PMTSS Series
To clean the PMTSS/PMTSS2/PMTSS2-SCM:
Use a soft, damp cloth to clean the housing.
Use only optical grade wipes to clean the window of the tube.
There are no serviceable parts in the PMTSS series optical head. If you suspect a problem with the module, please
contact Thorlabs by Phone: [phone] or email: [e-mail] for assistance from an
applications engineer.
5.1. Storing the PMTSS Series
When not in use, store the PMTSS/PMTSS2/PMTSS2-SCM in an environment without light leakage or stray light.

PMTSS Chapter 6: Connection and Programming
Rev B, August 9, 2016 Page 11
Chapter 6 Connection and Programming
The following schematic drawings provide information on the general electrical connections and the protocol to
program the PMTSS.
Figure 1 Voltage and Resistance Programming

PMTSS Chapter 7: Performance Plots
Page 12 TTN043089-D02
Chapter 7 Performance Plots
Figure 2 Cathode Radiant Sensitivity
Figure 3 PMTSS Gain

PMTSS Chapter 8: Specifications
Rev B, August 9, 2016 Page 13
Chapter 8 Specifications
8.1. General Specifications
Specification
Value
Module Dimensions
PMTSS
5.20” x 1.26” x 2.50”
(132.0 mm x 32.1 mm x 63.5 mm)
PMTSS2
10.18” x 8.09” x 3.40”
(258.5 mm x 205.5 mm x 86.4 mm)
PMTSS2-SCM
8.09” x 2.43” x 3.40”
(205.5 mm x 61.8 mm x 86.4 mm)
Operating Temperature
+15 to +40 C
Storage Temperature
-20 to +50 C
Input Voltage
+ 15 V DC
Input Current (Max)
7 mA
Output Signal Current
10 µA (Max)
Weight
PMTSS
0.3 kg
PMTSS2
1.4 kg
PMTSS2-SCM
0.9 kg
8.2. Performance Specifications
Specification
Value
PMT Type
Multialkali
Photocathode Geometry
Side On
Spectral Response
185 –900 nm
Peak Wavelength (λp)
450 nm
Radiant Sensitivity at λpa (Typical)
105 mA/W
Quantum Efficiency at λpa (Calculated)
>28%
Photocathode Active Area
0.15" x 0.51"
(3.7 mm x 13.0 mm)
Dark Current
2.0 nA (Typical); 10 nA (Max)
Warm-Up Time Before Control Voltageb
30 –60 minutes
Rise and Fall Time
1.4 ns
Settling Timec
10 s
Gain (Max)
>1.0 x 107
PMT Voltage
+250 –1000 V
PMT Control Voltage
+0.25 –1.2 V via M8 x 1 Power Connector
Recommended Control Voltage Adjustment
Range
+0.25 –1 V
Window
UV-Transmitting Glass (n = 1.48)
a. Radiant Sensitivity (RS) is related to quantum efficiency (QE) by the following expression:
𝑄𝐸 (%)= 𝑅𝑆 (𝑚𝐴/𝑊)
𝜆 (𝑛𝑚) 𝑥 124
b. The dark current rate specification is valid when the PMT has been turned on in the dark, no control voltage has
been applied during the specified warm-up time, and no signal has been incident during the specified warm-up time.
c. The time required for the output to reach a stable level for control voltage adjustment from +1 V to +0.5 V.

PMTSS Chapter 9: Mechanical Drawing
Page 14 TTN043089-D02
Chapter 9 Mechanical Drawing
Pin
Description
1
V+ Power Supply Unit
2
V Control (0.25V to 1.2V)
3
No Connection
4
Ground Power Supply Return
Figure 4 Mechanical Drawing of the PMTSS Housing

PMTSS Chapter 9: Mechanical Drawing
Rev B, August 9, 2016 Page 15
Figure 5 Mechanical Housing of PMTSS2 Housing

PMTSS Chapter 9: Mechanical Drawing
Page 16 TTN043089-D02
Figure 6 Mechanical Drawing of PMTSS2-SCM Housing

PMTSS Chapter 10: Cable Wiring Diagram
Rev B, August 9, 2016 Page 17
Chapter 10 Cable Wiring Diagram
H1
Signal
H2
Color
1
V+ Power Supply Input
3
BROWN
2
V Control (0.25 to 1.2V)
2
WHITE
3
No Connection
-
BLUE
4
GND Power Supply Return
1
BLACK
Figure 7 External Power Cable