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High power continuous laser at 461 nm based on a compact and high-efficiency frequency-doubling linear cavity

OPTICS EXPRESS(2021)

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Abstract
A Watt-level continuous and single frequency blue laser at 461 nm is obtained by frequency-doubling an amplified diode laser operating at 922 nm via a LBO crystal in a resonant Fabry-Perot cavity. We achieved a best optical conversion efficiency equal to 87% with more than 1 W output power in the blue, and limited by the available input power. The frequency-converted beam is characterized in terms of long term power stability, residual intensity noise, and geometrical shape. The blue beam has a linewidth of the order of 1 MHz, and we used it to magneto-optically trap Sr-88 atoms on the 5s(2) S-1(0) - 5s5p P-1(1) transition. The low-finesse, linear-cavity doubling system is very robust, maintains the lock for several days, and is compatible with a tenfold increase of the power levels which could be obtained with fully-fibered amplifiers and large mode area fibers. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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Key words
continuous laser,linear cavity,high-efficiency,frequency-doubling
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