Self‐Frequency‐Mixing Raman Laser Based on RbTiOPO₄

Abstract

In this work, the generation of yellow laser emission from a self‐frequency‐mixing Raman laser utilizing RbTiOPO4 (RTP) is reported. The RTP crystal is positioned within the cavity of a Nd:YAG/Cr4+:YAG composite, passively Q‐switched laser. By utilizing this intracavity configuration, Raman conversion of the fundamental laser wavelength to Stokes wavelengths and frequency mixing of these near‐infrared wavelengths to the visible wavelength range is achieved using a single RTP crystal. Multiple visible wavelengths are generated, with a primary line at 574.3 nm and additional weaker lines at 552.3 and 563.9 nm. An average output power of 180 mW is measured from the output coupler end of the laser setup (note that laser emission in the visible wavelength range is also generated toward the input end of the laser cavity) for an incident pump power of 11.4 W. The results demonstrate the potential of RTP as a self‐frequency‐mixing, Raman crystal, which may be used for the development of efficient and compact yellow lasers.