US EPA

3160249 

Journal Article 

5.7  W cw single-frequency laser at 671  nm by single-pass second harmonic generation of a 17.2  W injection-locked 1342  nm Nd : YVO₄ ring laser using periodically poled MgO : LiNbO₃ 

Koch, P; Ruebel, F; Bartschke, J; L'huillier, JA 

2015 

Yes 

Applied Optics
ISSN: 0003-6935
EISSN: 1539-4522 

54 

33 

9954-9959 

English 

26836563 

10.1364/AO.54.009954 

WOS:000364988100045 

We demonstrate a continuous wave single-frequency laser at 671.1 nm based on a high-power 888 nm pumped Nd:YVO₄ ring laser at 1342.2 nm. Unidirectional operation of the fundamental ring laser is achieved with the injection-locking technique. A Nd:YVO₄ microchip laser serves as the injecting seed source, providing a tunable single-frequency power of up to 40 mW. The ring laser emits a single-frequency power of 17.2 W with a Gaussian beam profile and a beam propagation factor of M²<1.1. A 60-mm-long periodically poled MgO-doped LiNbO₃ crystal is used to generate the second harmonic in a single-pass scheme. Up to 5.7 W at 671.1 nm with a Gaussian shaped beam profile and a beam propagation factor of M²<1.2 are obtained, which is approximately twice the power of previously reported lasers. This work opens possibilities in cold atoms experiments with lithium, allowing the use of larger ensembles in magneto-optical traps or higher diffraction orders in atomic beam interferometers.