Chapter 3 Setup - THORLABS DET01CFC User Manual

InGaAs 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 a Thorlabs TR-series ½" diameter post into
one of the #8-32 (M4 on /M version) tapped hole, located on the bottom and
side of the sensor, and mount into a PH-series post holder.
2. Attach a 50 Ω SMA to Coax cable (i.e. CA28xx) to the output of the DET.
Select and install a terminating resistor to the remaining end of the cable
(BNC Side), 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. 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 G, April 17, 2017
Chapter 3: Setup
Page 3