Low temperature performance of a commercially available InGaAs image sensor

We report the evaluation results of a commercially available InGaAs image sensor manufactured by Hamamatsu Photonics K. K., which has sensitivity between 0.95μm and 1.7μm at a room temperature. The sensor format was 128×128 pixels with 20 μm pitch. It was tested with our original readout electronics and cooled down to 80 K by a mechanical cooler to minimize the dark current. Although the readout noise and dark current were 200 e - and 20 e - /sec/pixel, respectively, we found no serious problems for the linearity, wavelength response, and intra-pixel response.