A single-frequency blue laser at 461 nm is generated by frequency doubling an amplified diode laser operating at 922 nm via a LBO crystal placed in an ultra-compact resonant linear cavity. The best optical conversion efficiency achieved by the setup is 87% which gives more than 1 W of power in the blue. The frequency-converted beam is characterized in terms of long-term power stability, residual intensity noise, hysteresis induced by the input power stability, and geometrical shape. The generated 461 nm radiation can be used to obtain a magneto-optical trap on strontium 5s21S0 – 5p1 P1 transition.
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