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This paper proposed a novel tunable dual frequency laser with large frequency difference,which used LD to pump the Nd∶YAG microchip in the end surface and put the liquid pressure on the radial direction of the crystal by a pressure transporting thin film. As a result of the stress birefringence, there was a mode splitting phenomenon of the microchip laser longitudinal mode. Both theoretical analysis and experiments indicated that there is a directly proportional relation between the frequency difference and the pressure, so the tunable frequency difference could be obtained when the pressure was changed. A large frequency difference of about 3.4 GHz with linear tunable relation was achieved in the experiment,so it can be a practical light source for the absolute distance interferometry.
This paper proposed a novel tunable dual frequency laser with large frequency difference, which used LD to pump the Nd: YAG microchip in the end surface and put the liquid pressure on the radial direction of the crystal by a pressure transporting thin film. of the stress birefringence, there was a mode splitting phenomenon of the microchip laser longitudinal mode. Both theoretical analysis and experiments indicating that there is a directly proportional relation between the frequency difference and the pressure, so the tunable frequency difference could be obtained when the pressure A large frequency difference of about 3.4 GHz with linear tunable relation was achieved in the experiment, so it can be a practical light source for the absolute distance interferometry.