Tr. Stevenson et al., DOUBLY RESONANT OPTICAL PARAMETRIC OSCILLATOR FORMED BY INDEX MATCHING CAVITY MIRRORS DIRECTLY ONTO AN UNCOATED LIB3O5 CRYSTAL, Optics letters, 20(7), 1995, pp. 722-724
We demonstrate the use of index-matching fluid to contact cavity mirro
rs directly onto an uncoated LiB3O5 crystal to form a compact, stable
resonator for use as an optical parametric oscillator. Specifically, w
e report on the characteristics of a continuous-wave, doubly resonant,
type II phase-matched LiB3O5 optical parametric oscillator formed in
this way. Using a single-frequency argon-ion pumping laser operating a
t 514.5 nm, we measured a pump power threshold of approximate to 100 m
W and a total external conversion efficiency of approximate to 15%. By
altering the crystal temperature under noncritical phase matching, we
measured coarse frequency tuning over approximate to 36 THz, limited
only by mirror coating bandwidths. We discuss also the transverse and
longitudinal mode properties of the optical parametric oscillator outp
uts.