D. Lee et Nc. Wong, STABILIZATION AND TUNING OF A DOUBLY RESONANT OPTICAL PARAMETRIC OSCILLATOR, Journal of the Optical Society of America. B, Optical physics, 10(9), 1993, pp. 1659-1667
We present experimental results of frequency tuning and stabilization
of a type-II phase-matched potassium titanyl phosphate (KTP) doubly re
sonant optical parametric oscillator. Four tuning elements were employ
ed to control the stability and tuning of the parametric oscillator. D
iscrete frequency tuning of a nearly degenerate optical parametric osc
illator over a range of approximately 3 THz was obtained by crystal an
gle tuning and cavity-length scanning. We achieved continuous frequenc
y tuning over a 0.5-GHz range through the use of temperature and elect
ro-optic tuning of the KTP crystal. Using these frequency-control tech
niques, we phase locked the signal-idler beat frequency to an external
microwave frequency source, thus demonstrating tunable optical freque
ncy division. The power spectral density of the residual phase noise o
f the phase-locked signal-idler beat note was measured to be 0.3 mrad/
square-root Hz. Characteristics of two different cavity designs, their
operations, tuning behavior, and stability issues are examined.