A Peltier cooled long wavelength infrared (LWIR ) position sensitive photon detector (PSD) based on the lateral effect is reported for the first time. It is a modified PIN LWIR HgCdTe photodiode forming the tetra lateral PSD of the photosensitive area 1×1 mm2, cooled to 205 K, optimized for the 4-11 µm wavelength band and reverse biased. The position resolution close to 1 µm was achieved with 32x averaging of 100 ns QCL laser pulses of the 10.5 µm wavelength and the 0.3 nJ energy focused on the spot of 240 µm 1/e2 diameter, with the box-car integration times of 1 µs and correlated double sampling.
We describe a new system for broadband characterization of mid-infrared (MIR) photodetectors, manufactured by the VIGO System and encapsulated in TO-8 can. The system comprises a high repetition rate pulsed quantum cascade laser source, stimulating a detector in a special test fixture that is connected to ports of a vector network analyzer (VNA) with a pair of cables. The system operates in a mode of nonlinear VNA, i.e. it is capable of measuring magnitude and phase spectra of harmonic signals up to 5 GHz of bandwidth. This approach enables recovering sub-nanosecond differential pulses of amplitudes below 1 mV and speed up performance evaluation of MIR detectors tested.
This article presents a laser diode driver that provides a fast modulation of a laser beam. A pulsed current source was designed and built to test Infra-Red (I-R) receivers in the Time Domain (TD). The proposed solution allows to estimate pulse responses of various photodetectors, whereas the testing was performed with a PiN photodetector. The pulse response brings the information on the behavior of the device under test in a wide frequency range. In addition, an experimental application of the proposed method is presented too. System discussed in this paper has been fully designed and manufactured in Warsaw University of Technology (WUT) in Institute of Electronic Systems (ISE).
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