Abstract

Work sponsored by NASA and reported in NASA Tech Briefs.8, No. 2 ( Winter1983) has many developments of interest to the optics community. For example:

© 1985 Optical Society of America

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Figures (13)

Fig. 1
Fig. 1

Infrared-sensitive monolithic integrated circuit (top) combines a voltage divider containing a lead chalcogenide photoresistor with an FET source follower. The circuit is shown schematically below. The source and drain of the FET are p-doped regions in the underlying n-type silicon wafer. All the other structures are formed at or deposited above the original surface plane of the wafer.

Fig. 2
Fig. 2

GaAs Schottky-barrier device is composed of layers deposited by conventional semiconductor fabrication techniques. This device differs from earlier ones of the same general type in its inclusion of an intermediate metal layer.

Fig. 3
Fig. 3

Output current vs voltage was measured under identical illumination for representative devices of the present and older types.

Fig. 4
Fig. 4

CMOS nand gate has an open circuit at the marked point. This fault can be detected by the occurrence of the output F = 0 at the end of the input sequence (X1,X2) = (1,1);(0,1).

Fig. 5
Fig. 5

Flip-flop modulator generates a square-wave carrier frequency that is half the clock frequency and turns the carrier on and off. The final demodulator output is the logical inverse of the data input.

Fig. 6
Fig. 6

Hotspots (picture elements with high dark current) are identified by scanning the CCD without illumination (left). This allows the image-processing system to eliminate false star indications (right).

Fig. 7
Fig. 7

In a telescope field divided into 10 strips, 10 pairs of optical fibers are moved laterally and longitudinally to any required position in their assigned strips. Only one fiber pair is shown here. The fixed ends of the fibers are arrayed in a line at the spectrograph entrance slit.

Fig. 8
Fig. 8

In this imaging system designed for use in fluid-flow research, the cube beam splitters can be replaced by plate-type beam splitters or pellicle beam splitters.

Fig. 9
Fig. 9

Alignment of a lidar system can be accomplished visually by using a low-power He–Ne laser that has been previously adjusted so that its visible beam is parallel to the invisible infrared CO2 laser beam.

Fig. 10
Fig. 10

Glass thermal-control coating has an outer scattering layer and an inner high-emissivity layer. The absorptivity/emissivity ratio is less than 0.4. The coating can withstand repeated exposure to temperatures in excess of 1093°C.

Fig. 11
Fig. 11

These five processing steps outline the laser-diode fabrication.

Fig. 12
Fig. 12

An n-type layer of InP on top of a p-type quaternary layer replaces the oxide stripe, offering improved laser performance.

Fig. 13
Fig. 13

Performances of uncoded and coded PPM are compared in terms of error probability and information rate.

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