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Suppression of relaxation–oscillations in intra-cavity optical parametric oscillators by two-photon absorption

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Abstract

The applications of continuous-wave (cw), intra-cavity optical parametric oscillators (ICOPO) in molecular sensing and spectroscopy have been hampered by their relaxation–oscillation and power–stability problems. To solve these problems, we propose a two-photon-absorption (TPA) mechanism into ICOPOs. In a proof-of-principle experiment, we inserted a CdTe plate into an ICOPO as a TPA medium and demonstrated efficient suppression of relaxation–oscillations, obtaining an intensity–noise reduction of over 70 dB at the relaxation–oscillation frequency. To the best of our knowledge, this is the first demonstration of relaxation–oscillation suppression in ICOPOs based on TPA.

© 2020 Optical Society of America

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