All-solid-state Quasi-continuous-wave Tunable Ti: Sapphire Laser and Pump-tuning PPLN-OPO

摘要

In this paper, high power and high efficiency operation of an all solid state, quasi-continuous-wave, Ti: sapphire laser is obtained with a laser diode pumped frequency doubled Nd: YAG laser. Discussing the output characters with three kinds of oscillate cavity, we acquire high output power, high light quality Ti: sapphire laser with flat to flat oscillate cavity. The maximum output power is 6.1W at 797nm with pump power of 27W, conversion efficiency is 22.6%, FWHM is 38.4ns and M~2 is 3.6. Tuning by birefringent filter, all solid state titanium doped sapphire laser's output wavelength is from 750～950nm and average output power is 4.7W. Pump-tuning method is very important and useful to OPO because it can relieve the OPO of any requirement for crystal translation or temperature variation. In this way, using PPLN crystal with poled period of 20.5μm, 1017～ 3384nm quasi-continuous-wave output is obtained pumped by Ti: sapphire laser which is tuned from 770 to 820nm. The maximum output power is 1.9W at 1208nm and conversion efficiency is 32%.OPO's average output power is 1.3W in whole output wavelength.