Patent ID: 9478930
Filing Date: 2016-10-25
CPC Classification: G02B,H01S

Claim Text:
1. A beam coupler comprising: a first beam displacer having a first input end and a first output end, the first beam displacer being configured to receive at the first input end a linearly-polarized signal seed having a first wavelength, and an unpolarized pump beam having a second wavelength, the unpolarized pump beam including first and second linear polarization components, the first beam displacer being further configured to spatially translate the first linear polarization component of the unpolarized pump beam to co-locate the first linear polarization component of the unpolarized pump beam with the linearly-polarized signal seed at the first output end; a second beam displacer having a second input end and a second output end, the second beam displacer being configured to spatially translate the second linear polarization component of the unpolarized pump beam and recombine the first and second linear polarization components of the unpolarized pump beam, and to co-locate the unpolarized pump beam with the linearly-polarized signal seed at the second output end; and a dual-wavelength waveplate interposed between the first output end of the first beam displacer and the second input end of second beam displacer, and configured to rotate polarizations of each of the first linear polarization component, second linear polarization component, and linearly-polarized signal seed.