Spectral and Spatial Coherence in Solid State Raman Lasers
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Multiple standing wave and traveling wave Ba(NO3)2 Solid State Raman Lasers (SSRLs) have been built and characterized. The Ba(NO3)2 SSRLs were pumped by a 1338 nm wavelength Nd:YAG laser resulting in 1556 nm output wavelength. Folded Raman ring resonators have produced near- transform-limited spectral coherence via injection-seeding. Several different resonators have also produced near-diffraction limited spatial coherence, without seeding. A three-mirror ring configuration Ba(NO3)2 SSRL produced 1/5 wave peak-to-valley wavefront aberration, 175 mJ/pulse and 30 pulses per second while being pumped by lasers with a beam quality figure of merit M2 > 15. The spectral and spatial coherence of the SSRLs is indicative of a rich phenomenology.
KeywordsRing Resonator Spatial Coherence Fiber Amplifier Master Oscillator Wavefront Aberration
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