Efficient near diffraction limited blue light source by sum-frequency mixing of a BAL and a solid-state laser
✍ Scribed by K.P. Sørensen; P. Tidemand-Lichtenberg; C. Pedersen
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 295 KB
- Volume
- 8
- Category
- Article
- ISSN
- 1612-2011
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✦ Synopsis
Sum-frequency mixing of an 808 nm broad area laser (BAL) with a build-in grating structure for spectral control and a 1064 nm solid-state laser is experimentally investigated. The spectrally improved 20 μm wide BAL can deliver up to 700 mW of output power with an M 2 of 1.4 and 5.3 in the fast and slow axis of the diode, respectively. The BAL output beam is single-passed through a periodically poled KTiOPO 4 (PP-KTP) crystal placed in an intra-cavity beam waist of a 1064 nm Nd:YVO4 laser, resulting in 100 mW of sum-frequency generated blue output power. This corresponds to a power conversion efficiency of 15%. The near diffraction limited blue output beam is measured to have an M 2 of 1.2 and 1.7 in the directions corresponding to the fast and slow axis of the BAL diode, respectively.
SFG power @ 460 nm, mW 70