Abstract
Singly-resonant optical parametric oscillators (SROs) operate with optimal efficiency at a pump power to threshold power ratio of (π/2)2 [1]. Additionally, SROs can exhibit multimode operation [2] at pump ratios above this optimal ratio, or even the onset of modulation instabilities at pump ratios lower than this optimal ratio, which prompts the demand for a functional method to control the output coupling and thus the threshold of SROs. In this work we demonstrate a simple approach to manage the SROs output coupling, through a straightforward one-dimensional translation of a volume Bragg grating (VBG) with continuously chirped diffraction efficiency. In contrast to previously published approaches, which either involved the cumbersome choice of suitable outcoupling mirrors or the employment of an additional anti-resonant cavity [3], our approach enables output coupling adjustment during SRO operation, while guaranteeing a minimal amount of additional parasitic losses, since only one cavity element has to be replaced.
© 2015 IEEE
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