Pulsed single-mode doubly resonant optical parametric oscillator based on the Vernier effect

Summary form only. Nanosecond pulsed optical parametric oscillators (OPOs) are very attractive sources for numerous applications of spectroscopy provided that stable single-mode operation is obtained. Although the output of a Q-switched OPO is naturally multimode, we show here that pulsed single-mode output can be achieved from a compact and rugged device based on a dual-cavity DROPO (doubly resonant optical parametric oscillator). This is of particular importance for pollutant detection and for nonlinear spectroscopy applications such as four-wave mixing diagnostics.