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IEEE Journal of Quantum Electronics

Two photon induced optical bistability in CdHgTe at room temperature

D. Craig, Ajoy Kumar Kar, Jinesh Mathew, Alan Miller

Published Sep 1, 1985• 25 citations
Publisher

Abstract

We report the first observation of quasi-steady state optical bistability in a 360 μm thick, uncoated Cd0.23Hg0.77Te etalon at room temperature as a result of the generation of free carriers through two photon absorption of pulsed 10.6 μm radiation from a hybrid TEA CO2laser (FWHM = 1.75 μs). The experimental results are compared with the predictions of a computer model.

DOI
10.1109/jqe.1985.1072816

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physica status solidi (b)•Dec 1, 1988•1 citation
We report the first observation of quasi-steady state optical bistability in a 360 μm thick, uncoated Cd0.23Hg0.77Te etalon at room temperature as a result of the generation of free carriers through two photon absorption of pulsed 10.6 μm radiation from a hybrid TEA CO2laser (FWHM = 1.75 μs). The experimental results are compared with the predictions of a computer model.
We report the first observation of quasi-steady-state optical bistability in an InSb etalon at room temperature as a result of the generation of free carriers through two photon absorption of 10 μm radiation. Nonlinear tuning of the etalon through two free spectral ranges has been achieved, with bistability observed around the two cavity resonances. Switching from a low to high transmission state has been achieved in times less than 10 ns while switching in the opposite direction occurs within 50-100 ns. The experimental results have been successfully fitted to a numerical model of the device.
We have observed bistability of the n-type Cd x Hg1− x Te in Auger-dominated in the following conditions: the input probe beam, obtained by splitting the CO2 laser with a ZnSe splitter, was incident upon the CdHgTe detector 1. The output probe beam, passing through the Fabry-Perot etalon, was detected by the CdHgTe detector 2. All beams were chopped using a mechanical chopper with a tunable mark/space ratio between 20:1 at a high speed synchronous motor. The signals of the incident and transmission intensity synchronously detected by using the CdHgTe detectors at 77 K were displayed on an oscilloscope. Our specimen was n-type Cd x Hg1− x Te (x = 0.225) at 77 K, the intrinsic carrier concentration n = 9.8 × 1014 cm-3, the mobility μ = 3.15 × 104 (cm2/V sec). The absorption coefficient α = 72 cm was polished plane parallel to form an etalon 215 μm thick, the reflectivities of which are R F = R B = R = 32%. In our experiment, the incident intensity I is 750 W/cm2 and both the laser mode and power stability met the standards.
We report the observation of optical bistability in an InSb resonator at room temperature. This effect and fringe shifts were caused by nonlinear refraction induced by two-photon absorption of radiation from a single longitudinal mode injection-locked pulsed CO2 laser operating at 9.6–10.6 μm. Intensities as low as 100 kW/cm2 were found to be sufficient to tune the 250-μm-thick cavity through a fringe maximum. From our results we deduce a value of χ(3) of the order of 10−4 esu over the range of intensities investigated.