Title :
Efficient difference frequency generation (DFG) employing injection-seeded optical parametric oscillator (OPO)
Author :
Haidar, S. ; Ito, H.
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
Abstract :
Efficient high energy OPO´s employing LiNbO3 or KTP crystals pumped by conventional Nd:YAG laser have been demonstrated in the range of 1-5 μm. To extend the source beyond 5 μm range an additional nonlinear step may be employed to generate difference-frequency of the two waves (signal and idler) obtained from an OPO. The difference frequency mixing is most easily done in nonlinear crystals such as AgGaSe2 and AgGaS2 which phase match over 3-18 μm and 1-12 μm range respectively. OPO output beam divergence and spectral linewidth should be very narrow for efficient difference-frequency mixing in a nonlinear crystal. An injection-seeded OPO with unstable resonator can have such properties
Keywords :
gallium compounds; lithium compounds; optical frequency conversion; optical parametric oscillators; optical phase matching; optical resonators; potassium compounds; silver compounds; spectral line breadth; ternary semiconductors; titanium compounds; 1 to 12 mum; 1 to 5 mum; 3 to 18 mum; AgGaS2; AgGaSe2; KTP; KTiOPO4; LiNbO3; Nd:YAG laser; OPO output beam divergence; YAG:Nd; YAl5O12:Nd; efficient difference frequency generation; high energy OPO; idler; injection-seeded optical parametric oscillator; nonlinear crystals; phase match; signal; spectral linewidth; unstable resonator; Crystals; Frequency; Laser excitation; Laser modes; Mirrors; Nonlinear optics; Optical resonators; Optical retarders; Pump lasers; Tuning;
Conference_Titel :
LEOS '99. IEEE Lasers and Electro-Optics Society 1999 12th Annual Meeting
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-5634-9
DOI :
10.1109/LEOS.1999.811861
