Journal
OPTICS EXPRESS
Volume 27, Issue 11, Pages 15351-15358Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.27.015351
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- Deutsche Forschungsgemeinschaft (DFG) [BR 4194/6-1]
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Whispering-gallery-mode resonators made of laser-active materials can serve as efficient microphotonic coherent light sources. However, the majority of experimental realizations relies on expensive pump light sources like narrow-linewidth or pulsed laser systems, which is inappropriate for most applications. In order to overcome this, we present a whispering-gallery laser system without the need for an expensive pump light source and at the same time with unprecedented laser performance: A laser-active resonator made of Nd:YVO4 is non-resonantly excited, employing a low-cost laser diode without any external frequency stabilization, emitting up to 100 mW optical power around 810 nm wavelength. Continuous-wave single-frequency lasing at 1064 nm wavelength is achieved with directed laser light emission in the mW-regime. The temporal power and frequency stability are within +/- 1.5 VG and +/- 30 MHz, respectively. Modehop-free frequency fine-tuning is achieved exceeding 11 GHz tuning range by changing the temperature of the cavity. Faster tuning can he expected when applying geometric or electro-optic instead of thermal tuning. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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