Search query: Degenerate four-wave mixing in semiconductor-doped glasses

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abstract: We report degenerate four wave mixing (DFWM) of visible radiation in borosilicate glasses doped with crystallites of the mixed semiconductor CdS x Se 1 x These semiconductor doped glasses available commercially in the form of colored glass filters exhibit third order nonlinearities of ~10 9 10 8 esu for DFWM with short ~10 nsec) laser pulses at various visible wavelengths. Our studies on the temporal decay of the transient gratings indicate that the nonlinearity is not thermal in origin but may be attributed to the generation of a short lived electron hole plasma. In contrast with DFWM experiments in other semiconductors invoking gratings of optically generated carriers (or other mobile particles) we report unique diffusion independent decay of the gratings in these glasses; this is deduced from the dependence of the intensity and polarization of the DFWM signal on the polarization combinations of the input beams. Finally, we report detailed data on the aberration correction properties of these isotropic glasses.
author_names: Ravinder K Jain

Richard C Lind
title: Degenerate four wave mixing in semiconductor doped glasses
year: 1983

author_names: K S Bindra

Shrikant M Oak

Kailash C Rustagi
title: Degenerate four wave mixing in semiconductor doped glasses below the absorption edge
year: 1999

abstract: A model for nonlinear transmission and degenerate four wave mixing in semiconductor doped glasses was developed and compared with experiment. The results of a plasma screening theory were used to model the nonlinear response of the semiconductor microcrystallites. The effects of carrier density dependent relaxation times, two photon absorption, free carrier absorption, and background absorption were included in the analysis. Good agreement between theoretical predictions and both nonlinear transmission and degenerate four wave mixing experiments at l 532 nm was obtained for 15 nsec laser pulses. For 30 psec pulses, with which higher intensities were available, features suggestive of two photon absorption and background absorption were observed. We conclude that free carrier absorption is not significant in these systems. Finally, it was shown that photodarkening is associated with the semiconductor crystallites in the glass matrix and that the host glass itself and unstruck samples exhibit little or no photodarkening.
author_names: Kenneth W DeLong

Allan Gabel

Colin T Seaton

George I Stegeman
title: Nonlinear transmission, degenerate four wave mixing, photodarkening, and the effects of carrier density dependent nonlinearities in semiconductor doped glasses
year: 1989

abstract: NearlyDegenerateFour+WaveMixinginSemiconductor+dopedGlassesZHANGYun(Zhang Yun )ZHAOFeng(Zhao Feng (Dept.ofAppliedPhysics,HarbinInstituteofTe.
title: Nearly Degenerate Four Wave Mixing in Semiconductor doped Glasses
year: 1997

author_names: Zhao-Qing Feng
title: Nearly Degenerate Four Wave Mixing in Semiconductor doped Glasses
year: 1997

abstract: Semiconductor doped glasses have been shown to exhibit large nonlinearities together with reasonably high transmissions near the band gap.1,2 Unfortunately, the nanosecond duration radiative recombination1 3 seems to hinder the use of such materials for high speed nonlinear applications. On the other hand, as the semiconductor concentration in these composite materials is relatively small the high overall transmission permits strongly saturating absorption of all crystallite with a moderate laser intensity. Therefore, Auger recombination can play an important role at the high free carrier concentration achieved in such a case and strongly decrease the radiative lifetime of the material.
author_names: Frederic de Rougemont

Robert Frey
title: Intracavity nearly degenerate four wave mixing in optically saturated semiconductor doped glasses
year: 1987

abstract: The fidelity of phase conjugation by degenerate four wave mixing in ruby and semiconductor doped glasses has been measured by means of our own modified Twyman Green interferometer [Opt. Lett. 14, 183 (1989) implementing two phase conjugate mirrors. It is shown that the fidelity of phase conjugators with an OG530 color filter as the nonlinear medium reaches a value of 99% The fidelity of ruby is also reported. Additionally the effect of the recording system on the value of the fidelity is discussed.
author_names: Solomon M Saltiel

B M Van Wonterghem

Dimitri A Parthenopoulos

Tracy E Dutton

Peter M Rentzepis
title: Fidelity of optical phase conjugation by degenerate four wave mixing in semiconductor glasses and ruby
year: 1989

abstract: The time dependence of both the photoluminescence due to carrier recombination and the gratings created by degenerate four wave mixing were measured in semiconductor doped color filter glasses. Values ranging from 80 to less than 16 ps (laser pulse width limited) are measured in several different samples at various excitation levels. A slower mechanism, believed to be thermal in nature, is also observed with a lifetime in excess of 9 ns.
author_names: S S Yao

Chris K Karaguleff

Allan Gabel

Rance M Fortenberry

Colin T Seaton

George I Stegeman
title: Ultrafast carrier and grating lifetimes in semiconductor doped glasses
year: 1985

abstract: We present a phenomenological theory of the intensity dependent dielectric function of semiconductor doped glasses near the absorption edge. It is shown that efficient phase conjugation by degenerate four wave mixing should be possible in these materials.
author_names: Kailash C Rustagi

Christos Flytzanis
title: Optical nonlinearities in semiconductor doped glasses.
venue: Optics letters
year: 1984

abstract: Using time resolved techniques, absorption recovery, and degenerate four wave mixing, we directly observe the nonexponential intensity dependent recombination of free carriers photoexcited in semiconductor doped glasses. We assign this behavior to Auger recombination.
author_names: Philippe Roussignol

Martin Kull

Daniel Ricard

Frederic de Rougemont

Robert Frey

Christos Flytzanis
title: Time resolved direct observation of Auger recombination in semiconductor doped glasses
year: 1987