High power continuous laser at 461 nm based on a compact and high-efficiency frequency-doubling linear cavity.
Opt Express
; 29(17): 27760-27767, 2021 Aug 16.
Article
em En
| MEDLINE
| ID: mdl-34615185
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-Pérot 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 88Sr atoms on the 5s2â
1S0 - 5s5pâ
1P1 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.
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MEDLINE
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En
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2021
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Article