Abstract
Self-stimulating Raman (self-Raman) laser technology, based on Raman-active laser crystals such as Nd doped vanadates or Nd doped tungstates in combination with a frequency-doubling crystal, is capable of providing simple, low-cost, and compact yellow laser systems. Potential applications include biomedicine, ophthalmology, DNA sequencing, and laser display. Passive Q-switching (using a saturable absorber), generates short pulses at high pulse rates and increases the Raman conversion efficiency while maintaining compactness of the system. In this paper, we present a compact (cavity length ∼30mm) passively Q-switched yellow laser based on an intra-cavity-doubled, diode-pumped, self-stimulating Raman composite Nd:YVO 4 /YVO 4 small-scale laser with a Cr:YAG crystal as the Q-switching element. The pump source was a 4.5W high brightness 808nm laser diode. To our knowledge, this is the first report of passively Q-switched yellow output from a self-stimulating Raman laser based on composite vanadates. A large quantum energy defect between pump and laser photons occurring in stimulated Raman frequency conversion impacts on the efficiency and the further power scaling of the system. Use of composite materials, consisting of Nd doped YVO 4 and un-doped YVO 4 , reduces the severe thermal loading in the self-Raman laser crystal.
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