Doubly resonant optical parametric oscillator synchronously pumped by a frequency-doubled, mode-locked, and Q-switched diode laser pumped neodymium yttrium lithium fluoride laser

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Abstract
We report on the synchronous pumping of an optical parametric oscillator (OPO) using a frequency‐doubled, mode‐locked, and Q‐switched diode laser pumped yttrium lithium fluoride laser. Using a 1 W pump diode, frequency modulation mode locking, and acousto‐optic Q switching, a pulse envelope of 75 ns duration and 45 μJ of energy in 21 ps pulses at 360 MHz repetition rate was obtained. This was frequency doubled in 90° phase‐matched MgO:LiNbO3 with 47% energy conversion efficiency. The doubly resonant OPO based upon temperature‐tuned MgO:LiNbO3 had an energy conversion efficiency of 20% at degeneracy. The tuning range of 983–1119 nm was limited by the mirror reflectivities.