Abstract
Spectral broadening of the fundamental field in intracavity Raman lasers is investigated. The mechanism for the spectral broadening is discussed and the effect is compared in two lasers using Raman crystals with different Raman linewidths. The impact of the spectral broadening on the effective Raman gain is analyzed, and the use of etalons to limit the fundamental spectral width is explored. It was found that an improvement in output power could be obtained by using etalons to limit the fundamental spectrum to a single narrow peak.
Highlights
IntroductionContinuous-wave (CW) intracavity Raman lasers can be compact and convenient sources of radiation in regions of the spectrum that are difficult to reach with other laser sources [1]
Continuous-wave (CW) intracavity Raman lasers can be compact and convenient sources of radiation in regions of the spectrum that are difficult to reach with other laser sources [1].Despite the physical simplicity of intracavity Raman lasers, the interactions between the various electromagnetic fields and the population inversion in the laser gain crystal are complex
Some of the same researchers observed similar broadening in a YVO4/Nd:YVO4/YVO4 Raman laser [9], with the fundamental spectrum broadening from 0.23 nm at the Raman threshold to 1.09 nm at maximum power, whilst the Stokes spectral width varied from 0.14 nm to 0.52 nm
Summary
Continuous-wave (CW) intracavity Raman lasers can be compact and convenient sources of radiation in regions of the spectrum that are difficult to reach with other laser sources [1]. A variety of spectral competition effects can arise in these systems, including undesired cascading to higher Stokes orders [2, 3], competition between different Raman shifts in the Raman crystal [4] or between a Raman shift in the laser gain crystal and that in the Raman crystal [5], and broadening of the spectrum of the fundamental laser emission due to the spectrally-varying loss induced by Stokes field. Dekker et al [6] observed complex structure developing in the fundamental and Stokes spectra of their frequency-doubled Nd:GdVO4 self-Raman laser, with a second fundamental peak at 1066 nm appearing at high powers This was attributed to the SRSinduced loss for the main fundamental transition at 1063 nm permitting the orthogonal 1066 nm transition to reach threshold [6].
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