Studies on the Character of Wide Band Frequency Doubling in LiB₃O₅ Crystal

The angular acceptance and the spectral acceptance about the retracing point of phase-matching angles for type I second-harmonic generation in LiB₃O₅(LBO) crystal have been measured. The exact wavelength in retracing point is found to be 1.303μm, and the spectral acceptance bandwidth and angular acceptance width are about 115nm-cm and 11mrad-cm respectively. A possible application of LBO crystal in direct frequency doubling of femtosecond laser pulse has been predicted with theory.