Abstract

Some developments of interest to opticists have been selected by Charles Braun, from NASA Tech Briefs 13, No. 5 ( May 1989). Further information can be obtained by writing to NASA STI Facility Manager, TU Division, P.O. Box 8757, BWI Airport, Baltimore, MD 21240-9985, citing the identifying number.

© 1989 Optical Society of America

Full Article  |  PDF Article

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.


Figures (5)

Fig. 1
Fig. 1

Errors in the wavefront reflected from mirror A would be corrected by compensating errors in the surface of mirror D. The corrections ensure that points in the image occupy the same relative positions in the image that they do in the field of view.

Fig. 2
Fig. 2

Flash coupled photodetector combines high quantum efficiency, charge collection efficiency, and ultralow read noise.

Fig. 3
Fig. 3

Multilayer structure would include HgCdTe light sensors with Si readout devices and GaAs signal processing circuits. A CdTe layer would provide a base for building up the HgCdTe layer.

Fig. 4
Fig. 4

Alternating, semitransparent semiconductor layers contain space charge barriers that form quantum wells. The modulating light (with photon energy greater than the semiconductor bandgap) induces photovoltaic action, which affects the transmission of the modulated light (having photon energy less than the bandgap).

Fig. 5
Fig. 5

Instruction sets for different computer operations reside on different external memory chips. Laser diodes activated for each operation generate light, which is reflected by the holographic optical element to designated receptors in the arithmetic and logic unit. The pattern of light beams embodies the instruction set at a given instant.

Metrics