Chapter 3 Setup - THORLABS DET10A2 User Manual

Si Biased Detector

Chapter 3 Setup

The detector can be set up in many different ways using our extensive line of
adapters. However, the detector should always be mounted and secured for best
operation. Step 1 in the setup instructions below outline how to mount the
detector onto a post.
1. Unpack the optical head, install either an imperial or metric optical post into
one of the mounting holes located on the bottom and side of the sensor, and
mount using a post holder. Note that these detectors feature tapped holes
that accept both 8-32 and M4 threads, so using either imperial or metric TR
posts is possible.
2. Attach a 50 Ω coax cable (i.e. RG-58U) to the output of the DET. Select and
install a terminating resistor to the remaining end of the cable and connect to
a voltage measurement device. See Chapter 4, page 7 to determine resistor
values. Thorlabs sells a 50 Ω terminator (T4119) for best frequency
performance and a variable terminator (VT2) for output voltage flexibility.
Note the input impedance of your measurement device since this will act as
a terminating resistor. A load resistor is not necessary when using current
measurement devices.
3. Power the DET on using the power switch. To check battery voltage, see the
Battery Check section on page 7.
4. Install any desired filters, optics, adapters, or fiber adapters to the input
aperture.
!
The DET10A2 was designed to allow maximum accessibility to the
photodetector by having the active area surface of the diode flush with the
outside of the DET housing. When using fiber adapters, make sure that the
fiber ferrule does not crash into the detector. Failure to do so may cause
5. During alignment, take appropriate precautions, such as using reduced
radiation power, or other precautions, and use proper eye and/or skin
protection as recommended by the radiation source manufacturer.
6. Apply a light source to the detector.
Rev A, December 27, 2017
Caution!
damage to the diode and/or the fiber.
Chapter 3: Setup
!
Page 3