Source: http://aoot.osa.org/ol/abstract.cfm?uri=ol-42-13-2435
Timestamp: 2019-04-25 13:47:08+00:00

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A highly efficient mirrorless optical parametric oscillator (MOPO), pumped by narrowband nanosecond pulses at 1064 nm, is demonstrated. The MOPO is based on quasi-phase-matched parametric interaction of counter-propagating photons in 1-mm-thick periodically poled Rb-doped KTiOPO4 crystal with a period of 755 nm. It generates a co-propagating signal at 1740 nm and a counter-propagating idler at 2741 nm, achieving mJ-level output with a total signal-and-idler conversion efficiency of 47%. Both generated waves present narrow spectral bandwidths, thanks to the unique properties of the counter-propagating nonlinear interaction. The high conversion efficiency, inherently narrow spectral width, and simplicity of the optical setup make the MOPO an attractive alternative to conventional co-propagating optical parametric oscillators.
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Fig. 1. PFM images of the domain structure on the non-polar b face of a representative PPRKTP crystal. The images have been scanned at (a) 100 μm, and (b) 900 μm below the patterned face, respectively.
Fig. 2. Schematic illustration of the experimental setup. HW, half-wave plate; POL, polarizer; PR, partially reflecting mirror for the idler wave; L, lens; DM, dichroic mirror.
Fig. 3. (a) MOPO conversion efficiency and pump depletion as a function of pump energy. (b) MOPO signal-conversion efficiency distribution across the optical aperture of the PPRKTP crystal.
Fig. 4. Measured spectra of (a) the pump, (b) forward-propagating signal, and (c) backward-propagating idler waves.
Fig. 5. Far-field intensity profiles of (a) incident pump, (b) signal, and (c) idler beams at a pump energy two times above the MOPO threshold.

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