1.35 GHz linearly tunable singl-frequency Nd: YVO₄ laser

The investigation on 808 nm CW lase-diode pumped all soli-state linearly tunable Nd:YVO4 laser was conducted in this paper. By utilizing methods of short cavity, inclined thin etalon and frequency stabilization including gain medium temperature control, mechanical vibration damping of the laser base and aerial isolation of external turbulence and noises, single frequency laser output at 1 064 nm was achieved with a maximum output power of 140 mW. Frequency characteristics was monitored by a Fabr-Perot interferometer and beam density distribution was also scanned, beam quality M2 was measured to be about 1.05 by knife technique. Electr-optical RTP crystal was fixed in the cavity and connected to a high power source, which allowed cavity length modulation by linear electr-optical effect. During the cavity length tuning process, mode hops were avoided by the real time angle tilting of the thin etalon. Frequency tuning range of the 1 064 nm laser reaches 1.35 GHz. Programed sa-tooth with a 2 200 V amplitude was further applied on the RTP and a 20 Hz periodical linear frequency tuning laser with an average power of 85 mW was obtained.