CONTINUOUSLY TUNABLE NARROW-BAND OPERATION OF AN INJECTION-SEEDED RING-CAVITY OPTICAL PARAMETRIC OSCILLATOR - SPECTROSCOPIC APPLICATIONS

A pulsed beta-barium berate optical parametric oscillator is injection seeded by cw diode lasers, yielding continuously tunable narrow-band output at its idler wavelength. A notable feature of this optical para metric oscillator is that it comprises a simple passive ring cavity wi th no active control of path length as the seed wavelength is scanned. We demonstrate this by recording Doppler-limited photoacoustic absorp tion spectra of acetylene gas and Doppler-free two-photon fluorescence spectra of rubidium vapor.