Dual-wavelength oscillation in an electronically tuned Ti : sapphire laser

Citation
N. Saito et al., Dual-wavelength oscillation in an electronically tuned Ti : sapphire laser, J OPT SOC B, 18(9), 2001, pp. 1288-1296
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Optics & Acoustics
Journal title
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
ISSN journal
0740-3224 → ACNP
Volume
18
Issue
9
Year of publication
2001
Pages
1288 - 1296
Database
ISI
SICI code
0740-3224(200109)18:9<1288:DOIAET>2.0.ZU;2-F
Abstract
Theoretical and experimental studies are carried out on the simultaneous du al-wavelength oscillation of a gain-switched Ti:Al2O3 laser, which is elect ronically tuned with an acousto-optic tunable filter (AOTF). Simultaneous o scillation at two wavelengths is performed by feeding two different radio f requencies (RFs) to the AOTF, although Ti:Al2O3 is known to be homogeneousl y broadened. Analysis based on semiclassical theory explains the temporal b ehavior and stability of dual-pulse oscillation, which is achieved by contr olling the cavity lifetimes for two operating wavelengths independently. Th e relationship between gain and cavity loss, which is controllable through the diffraction efficiency of the AOTF by adjusting RF powers, is studied. The effects of variations of the pump pulse energy and in the spontaneous e mission intensity have been studied in the numerical laser model for dual-w avelength operation. Because of the competition between the dual-wavelength pulses, the fluctuations in peak power in the experiment were observed to double compared with those observed during single-wavelength operation. Mos t experimental results of output characteristics agreed qualitatively with those of numerical predictions except for instability, which was significan tly lower than the predicted value. (C) 2001 Optical Society of America.