Abstract

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 $2\times {10}^{-4}$. To the best of our knowledge, this is the first demonstration of combining lasing and ${\chi }^{(2)}$ 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.

© 2017 Optical Society of America

Geometric tuning: spectroscopy using whispering-gallery resonator frequency-synthesizers

Christoph S. Werner, Wataru Yoshiki, Simon J. Herr, Ingo Breunig, and Karsten Buse
Optica 4(10) 1205-1208 (2017)

Output power enhancement of a self-frequency-doubled laser by selective excitation of inequivalent active centers in La₂CaB₁₀O₁₉ (Nd:LCB) crystal

Qiannan Fang, Haohai Yu, Huaijin Zhang, Guochun Zhang, Jiyang Wang, and Yicheng Wu
Opt. Lett. 42(23) 4861-4864 (2017)

Second-harmonic generation of light at 245 nm in a lithium tetraborate whispering gallery resonator

Josef U. Fürst, Karsten Buse, Ingo Breunig, Petra Becker, Josef Liebertz, and Ladislav Bohatý
Opt. Lett. 40(9) 1932-1935 (2015)

LED-pumped whispering-gallery laser

Simon J. Herr, Karsten Buse, and Ingo Breunig
Photon. Res. 5(6) B34-B38 (2017)

Fano resonances in a high-Q terahertz whispering-gallery mode resonator coupled to a multi-mode waveguide

Dominik Walter Vogt and Rainer Leonhardt
Opt. Lett. 42(21) 4359-4362 (2017)