Stability and frequency tuning of thermally loaded continuous-wave AgGaS_{2} optical parametric oscillators
JOSA B, Vol. 16, Issue 9, pp. 1481-1498 (1999)
http://dx.doi.org/10.1364/JOSAB.16.001481
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Abstract
We analyze and investigate experimentally the output stability and the frequency tuning characteristics of weakly triply resonant silver gallium sulfide (AgGaS_{2}) optical parametric oscillators. These oscillators are subject to thermally induced bistability and passive self-frequency-locking phenomena. The robust self-frequency-locking on a single-mode pair (thermal lock) originates from the material’s ability to correct external cavity-length perturbations, which would normally cause a mode hop, by increasing or decreasing the optical path length of the cavity through the thermo-optic effect triggered by the intracavity signal–idler power fluctuations. The Fourier frequency bandwidth of this passive servo is limited to ∼1 kHz by the thermal diffusion time constant, which is proportional to the ratio of the specific heat to the thermal conductivity C_{p}/K_{c}. A thermal feedback servo gain as high as 180 is obtained, owing to the large thermal figure of merit η= (dn/dT)/K_{c} of AgGaS_{2}, leading to routine passive mode-hop-free operation for more than 30 min, without the need for an external cavity-length servo. Analysis of the stability range of the thermally loaded standing-wave resonator shows that thermal lensing is less critical for shorter doubly resonant optical parametric oscillator cavities employing shorter-curvature mirrors, in agreement with experimental observations. When a doubly resonant oscillator operates near the boundary of the power stability range a self-pulsing behavior is observed on a number of axial mode pairs. This self-pulsing is found to originate from the destabilization of a self-locked cw state, and the transition from self-pulsing to the stable self-frequency-locked state is found to be controlled by the pump frequency detuning. The passive stability allows the single-parameter frequency tuning to be studied. Under pure thermal lock operation the oscillators show a tendency to resist the pump frequency and temperature tuning processes. When an external cavity-length servo is implemented continuous tuning over 850 MHz, by means of the pump frequency tuning (Δν_{s}/Δν_{p}≈0.66), and over 100 MHz, by means of the crystal temperature (Δν_{s}/ΔT≈250 MHz/°C), is obtained. These tuning ranges are in good agreement with calculations based on a cold doubly resonant oscillator.
© 1999 Optical Society of America
OCIS Codes
(160.4330) Materials : Nonlinear optical materials
(190.1450) Nonlinear optics : Bistability
(190.4870) Nonlinear optics : Photothermal effects
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
Citation
A. Douillet, J.-J. Zondy, A. Yelisseyev, S. Lobanov, and L. Isaenko, "Stability and frequency tuning of thermally loaded continuous-wave AgGaS_{2} optical parametric oscillators," J. Opt. Soc. Am. B 16, 1481-1498 (1999)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-16-9-1481
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