We demonstrate a novel method for improvement of spatial beam quality by use of the angular selectivity of a thick phase grating inserted into various laser cavities. Preliminary experiments with an intentionally degraded beam from a Nd:YVO ₄ laser have enhanced beam propagation factor M² by a factor of 4.5. Operation with a broad-area laser diode in an external cavity with a thick grating was achieved. We obtained 100 mW of cw power in a beam with an M² of 1.3. Moreover, a reduction of the output spectrum by as much as a factor of 3.8 was obtained.

© 2003 Optical Society of America

[Optical Society of America ]

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