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Proceedings Paper

Experimental study of gain amplification in DFDL under repetitive excitation
Author(s): Nasrullah Khan; Tom A. Hall
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Paper Abstract

A theoretical model was developed and simulated to confirm the result of our experimental study showing gain accumulation and peak pulse shifting phenomenon during repetitive excitation of distributed feedback dye laser. The dye cell was excited by 10 to 20 pulses of a frequency doubled, passively Q-switched and Mode-locked Nd:YAG laser. The output pulses of DFDL and Nd:YAG laser were investigated by Imacon 675-streak camera. At zero mutual delay of DFDL and Nd:YAG the peak of DFDL output envelope of pulses was delayed from the peak of the excitation Nd:YAG envelope of pulses by more than one inter-pulse period of excitation laser. Various types of cases such as different excitation energies and inter-pulse time periods were studied and a DFDL intensity based model was developed. The delay between the peaks of pulse envelopes of Nd:YAG and DFDL depends upon the inter-pulse period of the excitation laser. A computer program was used to simulate the experimentally measured delay to estimate thermal decay constants and energy retained by the medium. It was found that for smaller inter- pulse periods the effect of gradual gain build-up becomes very significant to effect some of the more sensitive applications such as energy per pulse in laser eye treatment, photonic switching and bit error rate in fiber optic communication.

Paper Details

Date Published: 23 June 1999
PDF: 6 pages
Proc. SPIE 3609, Optical Pulse and Beam Propagation, (23 June 1999); doi: 10.1117/12.351061
Show Author Affiliations
Nasrullah Khan, Univ. of Putra (Malaysia)
Tom A. Hall, Univ. of Essex (United Kingdom)

Published in SPIE Proceedings Vol. 3609:
Optical Pulse and Beam Propagation
Yehuda B. Band, Editor(s)

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