Abstract

In the absence of a thermal radiation background, it is possible to obtain a very high responsivity with far ir extrinsic photoconductive detectors. Using a low noise liquid helium-cooled preamplifier, we have obtained an NEP of ${10}^{-14}{\text{W Hz}}^{-\frac{1}{2}}$ for Ge:Ga at 100 μ in an instrument designed for rocket ir astronomy. The limiting noise factor appears to be generation recombination noise due to thermal excitation of other impurities present in the germanium.

© 1969 Optical Society of America

A Rocket-Borne Liquid Helium-Cooled Infrared Telescope. I: Dewar and Optics

D. P. McNutt, K. Shivanandan, and P. D. Feldman
Appl. Opt. 8(11) 2199-2204 (1969)

Rocket-Borne Liquid Helium Cooled Telescope

Martin Harwit, J. R. Houck, and K. Fuhrmann
Appl. Opt. 8(2) 473-477 (1969)

A Liquid Nitrogen Cooled, Rocket Borne, Infrared Telescope

Martin Harwit, D. P. McNutt, K. Shivanandan, and B. J. Zajac
Appl. Opt. 5(11) 1732-1735 (1966)

Superfluid-Helium-Cooled Rocket-Borne Far-Infrared Radiometer

A. G. Blair, F. Edeskuty, R. D. Hiebert, D. M. Jones, J. P. Shipley, and K. D. Williamson
Appl. Opt. 10(5) 1043-1050 (1971)

A ³He-Cooled Bolometer for the Far Infrared

H. D. Drew and A. J. Sievers
Appl. Opt. 8(10) 2067-2071 (1969)