Abstract

A Raman laser based on a bulk silicon single crystal with 1.127μm emission wavelength is demonstrated. The Si crystal with 30mm length was placed into an external cavity and pumped by a Q-switched Nd:YAG master oscillator power amplifier system. Strong defocusing of the pump and Raman laser beam by free carriers was compensated by an intracavity lens. Raman laser operation with a pulse duration of 2.5ns was identified by a Raman laser threshold significantly lower than the single-pass stimulated Raman-scattering threshold. Linear absorption losses of the 1.06415μm pump radiation are strongly reduced by cooling the Si crystal to a temperature of 10K.

© 2011 Optical Society of America

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