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US Patent 7639718 Output coupler for external cavity laser

Patent 7639718 was granted and assigned to Ondax Inc. on December, 2009 by the United States Patent and Trademark Office.

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Patent abstract

The disclosed invention is an external cavity laser with a volume holographic VHG output coupler. The facet of the VHG is coated with a very high reflectivity coating (HR close to 100%) for the purpose of reflecting the second harmonic (SH) light generated intra-cavity. The HR coating for the SH light has also an anti-reflection (AR) coating at the fundamental wavelength. The reflected second harmonic (SH) light is either reflected directly out of the cavity by the VHG or back to the cavity towards the optics that deflect the SH light out of the cavity.

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