Femtowatt photoreceivers are ideal for ultra-low-light-level detection. When used with a chopper and a lock-in amplifier, these photoreceivers can easily achieve sensitivity levels in the femtowatt range.
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femtowatt-photoreceivers - Drawings
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Specifications
Optical Input
Free Space
Detector Type
PIN
Detector Material
2151: Silicon 2153: InGaAs
Detector Diameter
1.0 mm
Bandwidth (-3 dB)
DC-750 Hz (DC) 30-750 Hz (AC)
Output Connector
Male BNC
Output Impedance
100 Ω
Maximum Transimpedance Gain
2x1010 V/A (DC Low and AC Low) 2x1011 V/A (AC High)
Power Requirements
Internal 9-V battery
Saturation Power
2151: 0.5 nW 2153: 0.25 nW
Damage Threshold
10 mW
Features
Amazing Amounts of Gain
These photoreceivers provide amazing amounts of gain (up to 2x1011 V/W) while being simple to use, making the most difficult spectroscopy or fluorescence experiment easy. Their high-gain and low-noise performance is achieved by careful selection of the amplifier-resistor pair. A large feedback resistor provides the high-gain values, while an ultra quiet amplifier keeps noise to a minimum. These photoreceivers are sensitive from the UV all the way to the IR, giving you the flexibility to work wherever you get the most signal. Their 1-mm photodetector diameter even makes alignment easy.
Typical responsivity of Models 2151 (blue) and 2153 (black)
Three Fixed Gain Settings
You can easily switch among the three fixed gain settings of 2x1011 (AC), 2x1010 (AC), and 2x1010 (DC) V/A. The two AC settings have a low-frequency roll-off at 30 Hz and eliminate DC drifts.
Battery Powered for Low-noise Performance
Powered by a single 9-V battery, these photoreceivers do not require cooling or high-voltage power supplies. Moreover, only a single coaxial cable is needed to connect the photodetector to other instruments. This elimiates ground loops, the most common source of noise. A non-conductive pad electrically isolates the case from the table, further eliminating noise pickup.
Using Filters and Optical Fiber
Newport offers accessories that can be used to attach a filter or optical fiber to these photoreceivers. To filter out unwanted background signals, a spike or band-pass filter can be mounted directly on the photodetector with the 1280 filter holder accessory. Model 1281 is an FC fiber adapter that allows an FC-connectorized fiber to be attached in front of these photoreceivers. Both accessories are sold separately and not included with the photoreceiver.
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