NDLI: Whispering gallery optical parametric oscillators: Coupling is the key

Content Provider	IEEE Xplore Digital Library
Author	Werner, C.S. Beckmann, T. Buse, K. Breunig, I.
Copyright Year	2013
Description	Author affiliation: Dept. of Microsyst. Eng. - IMTEK, Univ. of Freiburg, Freiburg, Germany (Werner, C.S.; Beckmann, T.; Buse, K.; Breunig, I.)
Abstract	Optical parametric oscillators (OPOs) are versatile sources for coherent light. They convert a pump wave at wavelength $λ_{p}$ to a signal at $λ_{s}$ and an idler wave at $λ_{i}$ fulfilling the condition $1/λ_{p}$ = $1/λ_{s}$ + $1/λ_{i}.$ Thus, the only fundamental tuning limitation is, that the frequency of the generated waves is lower than the one of the pump wave. The standard setup comprises a dielectric mirror resonator which is inherently large and coated for a specific spectral range. Recently, optical parametric oscillation has been demonstrated in optical whispering gallery resonators (WGRs). These monolithic cavities guide light by total internal reflection, combining very high quality factors and small mode volumes. This allows pump thresholds down to 10 μW pump power. Unlike conventional mirror resonators, whispering gallery resonators offer the ability to continuously vary the coupling strength. This is, e.g., possible by changing the distance between the coupler (in our case a prism) and the resonator. Our theoretical model suggests that strong overcoupling is necessary to achieve a high conversion efficiency. In contrast to this, to minimize the pump threshold the system should be weakly undercoupled. This allows to optimize the system for either high efficiency or low threshold power. Here, we experimentally proof this stated behavior.
Sponsorship	Eur. Phys. Soc.
Starting Page	1
Ending Page	1
File Size	139634
Page Count	1
File Format	PDF
e-ISBN	9781479905942
DOI	10.1109/CLEOE-IQEC.2013.6800860
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-05-12
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Couplings Optical resonators Optical pumping Optical coupling Mirrors Nonlinear optics Oscillators
Content Type	Text
Resource Type	Article

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