Chapter 3 Setup - THORLABS DET Series User Manual

DET08C(/M) 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 8-32 (M4 on the /M version) tapped holes located on the
bottom and side of the housing, and mount using post holder.
Attach a 50 Ω SMA-to-coaxial cable (i.e., Item # CA28xx) to the output
2.
of the detector. Select and provide a terminating resistor to the
remaining end of the cable. See Chapter 4, page 7, to determine
resistor values. Thorlabs sells a 50 Ω terminator (Item # T4119) for best
frequency performance and a variable terminator (Item # 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-measuring devices.
Note: For fastest response, terminate with a 50 Ω load.
3. 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.
4. Apply a light source to the detector.
Rev F, May 15, 2019
Chapter 3: Setup
Page 3