13 March 2024Mirrorless backward-wave optical parametric oscillator: a unique approach for laser frequency down-shifting with preserved spectral features
A. Zheng,1,2 K. M. Mølster,3 X. Délen,2,4 P. Mutter,3 J.-B. Dherbecourt,1,2 J.-M. Melkonianhttps://orcid.org/0000-0002-3447-8446,1,2 A. Zukauskas,3 F. Laurell,3 P. Georges,2,4 M. Raybaut,1,2 V. Pasiskevicius,3 A. Godard1,2
1ONERA (France) 2Univ. Paris-Saclay (France) 3KTH Royal Institute of Technology (Sweden) 4Lab. Charles Fabry, CNRS (France)
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We present our last numerical and experimental results on a mid-infrared source based on a tunable Yb-based hybrid MOPA pump and a Backward Wave Optical Parametric Oscillators (BWOPO). The BWOPO has a record-low oscillation threshold of 19.2 MW/cm2 and generates mJ-level output with an overall conversion efficiency exceeding 70%. The BWOPO acts a frequency shifter of the pump radiation toward the forward wave, maintaining the pump spectral properties. The demonstrated tuning range of 10 GHz is already compliant for DIAL applications. We have also developed advanced numerical modelling of the BWOPO taking into account spectral and, for the first time, spatial beam profiles.
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A. Zheng, K. M. Mølster, X. Délen, P. Mutter, J.-B. Dherbecourt, J.-M. Melkonian, A. Zukauskas, F. Laurell, P. Georges, M. Raybaut, V. Pasiskevicius, A. Godard, "Mirrorless backward-wave optical parametric oscillator: a unique approach for laser frequency down-shifting with preserved spectral features," Proc. SPIE PC12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII, PC1286905 (13 March 2024); https://doi.org/10.1117/12.3001671