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Studies of medium infrared materials for nonlinear optical devices

Studies of medium infrared materials for nonlinear optical devices
Studies of medium infrared materials for nonlinear optical devices
The thesis describes the characterisation of ternary II-IV-V2 and I-III-VI2 semiconductors with a view to their application in medium infrared nonlinear optical devices. An extensive state-of-the-art of the properties of ternaries is presented. Detailed studies on linear optical and some other properties have been made of silver thiogallate (AgGaS2). Phasematched second harmonics were generated in AgGaS2 near a noncritical matching region. Transmission ranges of thirteen ternary compounds have been studied experimentally and basic physical phenomena identified. Two theoretical models have been developed; a semi-empirical force-conatant model for predicting the infrared cut-offs, and a modified Sellmeier formula for the representation of refractive index dispersion.

Methods for interpolating refractive indices have been studied in detail and the Sellmeier parameters for ternaries and some other medium infrared nonlinear materials are presented. Phase-matching conditions for second harmonic generation, parametric oscillation, up-conversion and down-conversion have been analysed for the following compounds; AgGaS Z' AgGaSe Z' ZnGeP2 ZnSiAs2 CdGeAs2 Ag3AsS3, Ag3SbS3, a-HgS, Te and CdSe. Particular emphasis is placed on techniques involved in the generation of tunable infrared radiation.

Finally described is an entirely new method of generating infrared radiation tunable over a wide wavelength. range by the down-conversion of the outputs of a parametric oscillator with limited tuning.
Bhar, Gopal C.
416e2aea-b48a-4f7d-8562-5730af62f526
Bhar, Gopal C.
416e2aea-b48a-4f7d-8562-5730af62f526
Smith, R. C.
2890e5a7-d3ae-4850-924a-be58b7a15a73

Bhar, Gopal C. (1973) Studies of medium infrared materials for nonlinear optical devices. University of Southampton, Department of Electronics, Doctoral Thesis, 186pp.

Record type: Thesis (Doctoral)

Abstract

The thesis describes the characterisation of ternary II-IV-V2 and I-III-VI2 semiconductors with a view to their application in medium infrared nonlinear optical devices. An extensive state-of-the-art of the properties of ternaries is presented. Detailed studies on linear optical and some other properties have been made of silver thiogallate (AgGaS2). Phasematched second harmonics were generated in AgGaS2 near a noncritical matching region. Transmission ranges of thirteen ternary compounds have been studied experimentally and basic physical phenomena identified. Two theoretical models have been developed; a semi-empirical force-conatant model for predicting the infrared cut-offs, and a modified Sellmeier formula for the representation of refractive index dispersion.

Methods for interpolating refractive indices have been studied in detail and the Sellmeier parameters for ternaries and some other medium infrared nonlinear materials are presented. Phase-matching conditions for second harmonic generation, parametric oscillation, up-conversion and down-conversion have been analysed for the following compounds; AgGaS Z' AgGaSe Z' ZnGeP2 ZnSiAs2 CdGeAs2 Ag3AsS3, Ag3SbS3, a-HgS, Te and CdSe. Particular emphasis is placed on techniques involved in the generation of tunable infrared radiation.

Finally described is an entirely new method of generating infrared radiation tunable over a wide wavelength. range by the down-conversion of the outputs of a parametric oscillator with limited tuning.

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More information

Published date: 1973
Organisations: University of Southampton, Electronics & Computer Science

Identifiers

Local EPrints ID: 394744
URI: https://eprints.soton.ac.uk/id/eprint/394744
PURE UUID: 68e8163b-5669-420e-b18b-60d7bcfa254e

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Date deposited: 22 Jun 2016 12:40
Last modified: 20 Dec 2018 17:31

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