학술논문
150-ps pulse Raman generator pumped by a 1-kHz sub-nanosecond passively Q-switched laser system.
Document Type
Article
Author
Source
Subject
*BARIUM compounds
*POWER amplifiers
*FORCE & energy
*SINGLE crystals
*WAVELENGTHS
*PHASE modulation
*RAMAN spectroscopy
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Language
ISSN
0946-2171
Abstract
Raman conversion with a single Ba(NO) crystal (barium nitrate) either in single- and double-pass travelling-wave setups has been investigated. A Master-Oscillator-Power-Amplifier (MOPA) system, based on a passively Q-switched (PQS) laser generating 500-ps pulses and delivering a total energy of 350 μJ at 1 kHz, was used as pump source for the Raman generator. The two-passes setup yielded 116-μJ, 150-ps Fourier- and diffraction-limited pulses at 1198 nm for ≈3× the Raman threshold with no additional Stokes lines, and conversion efficiency of 35%. Such results are interesting not only for direct applications of the wavelength-shifted laser source, but also for further pulse-compression and supercontinuum generation in fibers. Indeed, self-phase modulation up to 0.82 nm has been demonstrated (pulse compression down to 5 ps) as well as 120-nm supercontinuum. [ABSTRACT FROM AUTHOR]