Hannover 2020 – scientific programme
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 2: Laser Systems
K 2.3: Talk
Tuesday, March 10, 2020, 14:30–14:45, f428
Influence of the dispersion in a doubly resonant optical parametric oscillator — •Christian Markus Dietrich1,2, Ihar Babushkin1,2,3, José R.C. Andrade1,2, Han Rao1,2, and Uwe Morgner1,2 — 1Leibniz University Hannover, Institute for Quantum Optics, Hannover, Germany — 2Cluster of Excellence PhoenixD, Hannover, Germany — 3Max Born Institute, Berlin, Germany
We present measurements and a numerical model of the spectral behaviour of a doubly resonant optical parametric oscillator (DROPO) in relation to the intracavity second and third order dispersion. DROPOs can be interesting light sources for comb generation and spectroscopy. In a DROPO the signal and idler wavelengths are both resonant and need to fulfill a proper phase relation, which is influenced by the dispersion of the cavity. This leads to complex length detuning characteristics in the optical spectrum. Self phase locking of the DROPO to the pump appears at degeneracy and proper length tuning. By using this effect, phase-stable multi-color light fields can be generated which are promising for high harmonic generation and other effects. Our experimental work is explained by a numerical model solving the coupled differential equations for the two orthogonal polarization directions in the amplifier crystal. Even though the model is restricted to one spatial dimension only, it can help for understanding the complex pulsing dynamics in a DROPO.