Tunable two wavelength laser for super heterodyne interferometer - comprises diode pumped solid state laser and allows tuning of differential frequency of two wavelengths in typical range of 0 to 30 GHz by phase modulation

摘要

The resonator of the solid state laser contains an electro-optical crystal which, with the application of an external electrical field, produces relative shift of the laser frequencies by phase modulation dependent on polarisation. The electric field serving for the tuning, lies transversely or longitudinally to the electro-optical crystal in accordance with the crystal cut. USE/ADVANTAGE - In interferometer for absolute measurement. Very compact, small line width, produces two beams mutually at right angles, which can be detuned over complete range of 0 to 30 GHz.