Extension of spectral range of Peltier cooled photodetectors to 16 µm

A. Piotrowski; J. Piotrowski; W. Gawron; J. Pawluczyk; M. Pedzinska

doi:10.1117/12.829933

6 May 2009 Extension of spectral range of Peltier cooled photodetectors to 16 μm

A. Piotrowski, J. Piotrowski, W. Gawron, J. Pawluczyk, M. Pedzinska

Proceedings Volume 7298, Infrared Technology and Applications XXXV; 729824 (2009) https://doi.org/10.1117/12.829933
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

We have developed various types of photodetectors operating without cryocooling. Initially, the devices were mostly used for uncooled detection of CO₂ laser radiation. Over the years the performance and speed of response has been steadily improved. At present the uncooled or Peltier cooled photodetectors can be used for sensitive and fast response detection in the MWIR and LWIR spectral range. The devices have found important applications in IR spectrometry, quantum cascade laser based gas analyzers, laser radiation alerters and many other IR systems. Recent efforts were concentrated on the extension of useful spectral range to >13 μm, as required for its application in FTIR spectrometers. This was achieved with improved design of the active elements, use of monolithic optical immersion technology, enhanced absorption of radiation, dedicated electronics, series connection of small cells in series, and last but not least, applying more efficient Peltier coolers. Practical devices are based on the complex HgCdTe heterostructures grown on GaAs substrates with MOCVD technique with immersion lens formed by micromachining in the GaAs substrates. The results are very encouraging. The devices cooled with miniature 4 stage Peltier coolers mounted in TO-8 style housings show significant response at wavelength exceeding 16 μm.

Citation Download Citation

A. Piotrowski, J. Piotrowski, W. Gawron, J. Pawluczyk, and M. Pedzinska "Extension of spectral range of Peltier cooled photodetectors to 16 μm", Proc. SPIE 7298, Infrared Technology and Applications XXXV, 729824 (6 May 2009); https://doi.org/10.1117/12.829933

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