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Self-frequency doubling in a laser-active whispering-gallery resonator

: Herr, Simon; Folwill, Yannick; Buse, Karsten; Breunig, Ingo


Optics Letters 42 (2017), No.13, pp.2627-2630
ISSN: 0146-9592
Journal Article
Fraunhofer IPM ()
whispering Gallery Resonator; nonlinear optics; integrated optics; Laser

Lasing and self-frequency doubling are achieved in a millimeter-sized laser-active whispering-gallery resonator made of neodymium-doped lithium niobate. A low-cost 808-nm laser diode without external frequency stabilization is sufficient to pump the neodymium ions. Laser oscillation around 1.08 μm drives a frequency-doubling process within the same cavity providing green light. The electrical-optical efficiency of the system reaches up to 2×10−4. To the best of our knowledge, this is the first demonstration of combining lasing and 𝜒(2) frequency conversion in a single high-𝑄 whispering-gallery resonator. This approach is general and can be applied to other materials and other nonlinear optical processes.