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The pressure sensitivity of the phase of light propagating in a single-mode fiber coated with a thin nickel jacket is determined both analytically and experimentally. The measured acoustic response of the fiber is found to be 1 order of magnitude lower than that of the bare fiber, in agreement with analytical predictions. The technique thus appears to be a promising way for desensitizing optical-fiber leads for use with fiber-optic sensors.

We present characteristics of 850-nm oxide confined vertical-cavity surface-emitting lasers (VCSELs) developed for applications in optical parallel data links and free-space optical interconnects. Low threshold currents of less than 200 ltA, wall-plug efficiencies approaching 30%, operating voltages of less than 2 V for 1 mW of optical power, and operation over a wide temperature range, up to 190°C, are demonstrated. We optimized VCSEL arrays for operation at elevated temperatures for use in dense free-space interconnects. Excellent performance uniformity -optical power of 1±0.1 mW at a drive current of 3 mA -across a 20x20 array was achieved at 75°C. We integrated two-dimensional top emitting VCSEL arrays with topilluminated metal-semiconductor-metal (MSM) detectors for future use with CMOS integrated circuits. We discuss design issues encountered in VCSEL-based modules for optical interconnects.

Abstract— Stimulant‐induced changes in soluble preparations from rabbit olfactory epithelium were monitored by ultraviolet difference spectroscopy. A time‐dependent decrease of absorbance, maximum at 267 nm, was generated when specific stimulants were mixed with the olfactory preparations. Only seven of the 37 organic chemicals tested generated the absorbance change at 267 nm. The olfactory preparations exhibited a high degree of selectivity and sensitivity; measurable absorbance changes were observed when the active stimulant concentrations were 1 × 10−5m. The experimental results suggest a complex mechanism of conformational change for the initial stimulant‐induced molecular interactions in biological chemosensing.

We report in this paper the development of an automated thermoplastic holographic camera which produces reproducible results from cycle -to -cycle and from sample to sample. Design innovations and performance characterization of the camera are described; its use in holographic interferometry is also illustrated. AbstractWe report in this paper the development of an automated thermoplastic holographic camera which produces reproducible results from cycle-to-cycle and from sample to sample. Design innovations and performance characterization of the camera are described; its use in holographic interferometry is also illustrated.