Compact second-harmonic generation laser module with 1 W optical output power at 490 nm

Published in:
Opt. Express, vol. 17, no. 25, pp. 22785-22790 (2009).
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Abstract:
We demonstrate continues-wave 1 W at 490 nm on a 2.5 cm³ micro-optical bench using single-path second-harmonic generation with a periodically poled MgO:LiNbO₃ bulk crystal. The pump laser is a distributed Bragg reflector tapered diode laser having a single-frequency spectrum and a pump power of 9.5 W. Based on that 1 W blue light could be achieved resulting in an optical conversion efficiency of 11%. Furthermore, the module has an output power stability of better than 2% and the blue laser beam shows an nearly diffraction limited beam quality of M²_σ = 1.2 in vertical and M²_σ = 2 in lateral direction.

OCIS codes:
(140.2020) Diode Lasers; (140.3515) Lasers frequency doubled; (190.2620) Harmonic generation and mixing; (240.3990) Micro-optical devices

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