SKU: COAD
The COAD is designed for low-light-level detection for the 0.9 to 2.57 µm wavelength range. It has an amplified, thermoelectrically cooled (-10°C), switchable-gain, switchable-bandwidth, extended InGaAs PIN photoconductive detector. The detector is mounted on a thermoelectric cooler with a thermistor that provides feedback to maintain a constant temperature of about -10°C via an internal circuitry. This cooling enhances detectivity, resulting in higher gains and lower thermal noise. The gain, response bandwidth, and sensitivity are all interrelated. Two eight-position rotary switches allow for varying the gain in 10 dB steps and selecting bandwidths from 500 Hz to 1 MHz to optimize performance for specific applications. The first two gain steps (0 dB and 10 dB) are biased to -2 V for high-speed performance, while the remaining gain steps are unbiased for high-precision measurements. Integration with a MEMS chopper is an option that further reduces the noise floor. The detector is DC-coupled with a 50 Ω load impedance and an output signal of up to 5 V. The detector is compatible with any SM1-threaded accessory, such as fiber adaptors, light filters, apertures, etc.
Warning: Do not block, limit airflow to, or stop the cooling fan, as this will increase output noise and damage the TEC cooler.
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