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Southeastern Symposium on System Theory (SSST)

Generation of a short pulse by optical free induction decay (OFID) using the rising edge of a TEA CO/sub 2/ laser pulse for excitation

C.R. Rodrigues, S. M. Mahajan, Carl A. Ventrice

Published Nov 27, 2002• 0 citations
Publisher

Abstract

The generation of short CO/sub 2/ laser pulses is achieved in several ways such as the optical free induction decay (OFID) technique. The OFID technique is a relatively simpler mechanism of generating short pulses and easily invites further study of the technique. The present work involves the interaction of the rising edge of a pulsed CO/sub 2/ laser with ammonia and Dymel in an effort to generate an OFID pulse.

DOI
10.1109/ssst.1998.660116

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The generation of short CO/sub 2/ laser pulses is achieved in several ways such as the optical free induction decay (OFID) technique. The OFID technique is a relatively simpler mechanism of generating short pulses and easily invites further study of the technique. The present work involves the interaction of the rising edge of a pulsed CO/sub 2/ laser with ammonia and Dymel in an effort to generate an OFID pulse.
A simple application of the Stark-pulse technique, developed by Brewer and Shoemaker, demonstrates optical free induction decay-the optical analog of free induction decay in NMR. A molecular sample which is coherently prepared by a cw laser beam exhibits such a decay when it is suddenly switched out of resonance by a Stark field. Observations are presented for a nondegenerate Doppler-broadened infrared transition of NH2{\mathrm{H}}_{2}H2​D, where the sample is optically thin, and the decay behavior can be compared quantitatively with a solution of the Bloch equations. When the molecular sample is prepared under steady-state conditions, the solutions are analytic; for pulse excitation, a numerical solution is required. The treatment invokes a hard-collision relaxation model. Such characteristics as the abrupt termination of the decay and the related edge echo, which result from Doppler dephasing, can be examined for Stark pulses of finite extent.