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A kilohertz repetition rate 1.9 μm H2 Raman oscillator

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2 Author(s)
Stewart, R.B. ; ABIOMED, Danvers, MA, USA ; Kung, R.

Raman conversion of a high-repetition-rate Q-switched Nd:YAG laser using a gaseous H2 Raman medium is reported. With a H2 cell placed in a focusing intracavity Raman oscillator, 3 W of average power at 1.9 μm was obtained from a 15-W 1.06-μm laser operating at 2 kHz. Although the pump beam was multimode, the Stokes output was diffraction limited. At kilohertz repetition rates, conversion efficiencies were improved with a flowing gas cell which substantially reduced the thermal lensing effect in the Raman medium. A rate equation approach was used to model the intracavity conversion process

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Quantum Electronics, IEEE Journal of  (Volume:25 ,  Issue: 10 )