Photodetectors

We offer ready-made systems and components

Silicone, germanium and avalanche photodetectors

Hinds Instruments' photodetector modules are specifically designed for use with high frequency optical signals including those generated in Photoelastic Modulator (PEM) applications.

We offer three Photodetector Modules:

Silicon Photodiode Detectors
Germanium Photodiode Detectors
Avalanche Photodiode Detectors

All Hinds PhotoDetectors include these features:

Frequency Response. DC up to 1 MHz.
Dark-current and/or Background DC Null.
Preamplification for Current to Voltage Conversion and Buffering for Impedance Matching to Signal Cables.
Power Supply included

APD Detector Module include these additional features:

Fully Adjustable Gain
Broad Spectral Range, 200-1000nm
Large Active Area, 19.6mm2
Low Power/Low Voltage, Bipolar, +/-12V
Approaches PMT sensitivity

PEM-based optical systems require detectors with a frequency response of at least twice the operating frequency of the PEM. This makes Hinds detection systems ideal for your PEM applications.

For many applications, separate lowpass or DC signals and wide-band AC signals derived from the detector output are required. With the help of the Signal Conditioning Unit, this is possible.

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DET-200

APD-100

Silicon photodetectors

Hinds’ detection systems are specifically designed for use with high frequency optical signals including those generated in Photoelastic Modulator (PEM) applications.

Hinds’ detection features include:

Frequency response of DC to several times the operating frequency of the PEM being used, 400kHz - 1 MHz depending on the model
The DET-200 maintains a constant bandwidth throughout all gain settings
Gain Selection, 10 positions
The DET-200 exhibits a constant DC offset throughout all gain settings
Offset Voltage (all gain settings), < ± 5mV
Hi Z load from 0-10V and a 50Ω load from 0-5V
Power supply included
Optional standoffs for mounting a precision polarizer mount

The DET-200 dimensions are 2” x 2” x 1” and have a #8-32 tapped hole for post mounting. The following detectors are suitable for signals in the 0.05mW to 5 mW range. For lower signal levels Hinds see avalanche diode photodetector the APD-100.

DET-200 Specifications

Model	Type	Spectral Range (nm)	Active Area	Frequency Response	NEP w/√Hz
2	Si-PC	350 - 1100	16 mm²	DC - 1 MHz	3.55e-12
4	Si-PV	350 - 1100	16 mm²	DC - 1 MHz	7.99e-12
6	Si-PV	200 - 1100	20 mm²	DC - 400 kHz	3.77e-11

Germanium photodetectors

Hinds’ detection systems are specifically designed for use with high frequency optical signals including those generated in Photoelastic Modulator (PEM) applications.

Hinds’ detection features include:

Frequency response of DC to several times the operating frequency of the PEM being used, 400kHz - 1 MHz depending on the model
The DET-200 maintains a constant bandwidth throughout all gain settings
Gain Selection, 10 positions
The DET-200 exhibits a constant DC offset throughout all gain settings
Offset Voltage (all gain settings), < ± 5mV
Hi Z load from 0-10V and a 50Ω load from 0-5V
Power supply included
Optional standoffs for mounting a precision polarizer mount

Model	Type	Spectral Range (nm)	Active Area	Frequency Response	NEP w/√Hz
7	Ge-PV	800 - 1600	3 mm²	DC - 1 MHz	1.17e-11
8	Ge-PV	800 - 1600	20 mm²	DC - 1 MHz	3.92e-11

Avalanche photodetector

Hinds Instruments offers an avalanche diode photodetector module that is optimized for use with the PEM and low light levels. It is less expensive, safer, more rugged and easier to use than a photomultiplier tube (PMT).

The gain is adjustable and the bandwidth is DC to 450 kHz, making it useful for circular dichroism experiments and other polarization measurements that involve small, fast (PEM frequency) signals.

Hinds designed the module using an avalanche photodiode that is sensitive to a minimum 5 microWatt (at maximum gain) signal and is usable from 200 – 1000 nm. While it is not sensitive enough for photon counting, it is well suited for most other applications that previously required a PMT. Unlike a PMT, it does not require the expense or large footprint of a high voltage power supply.

APD-100 Specifications and Output Characteristics

Spectral Range (nm)	Peak Sensitivity Wavelength	Photodiode Diameter	Effective Active Area	NEP at Response Peak	Frequency Bandwidth (3dB)
200 - 1000	620 nm	5 mm	19.6 mm²	1 pW/√Hz	DC to 450 kHz

Output Voltage at Saturation	Min Gain	1.34
	Max Gain	8.5
Photoelectric Sensitivity, V/W	Min Gain λ = 620nm	0.04 x 10⁶
	Max Gain λ = 620nm	2 x 10⁶
Maximum Input Light Level, uW	Min Gain λ = 620nm	250
	Max Gain λ = 620nm	5
Minimum Detection Limit	Max Gain λ = 620nm	2 nW r.m.s.

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