Patent ID: 7916388

Claim:
A device comprising: a first laser source producing a first output beam having a wavelength, λ l , a second laser source producing a second output beam having a wavelength, λ 2 , with, λ 1 ≠λ 2 , an amplifier having a gain band including λ 1 and λ 2 , wherein said amplifier comprises a plurality of amplifier chambers positioned along a common beam path an optical isolator having a polarization discriminating optic substantially transmitting light having a first linear polarization and substantially blocking transmission of light having a linear polarization orthogonal to said first polarization; a coupling optic having a transmission-reflection ratio, TRR 1 , for light having a wavelength, λ 1 , and a transmission-reflection ratio, TRR 2 , for light having a wavelength, λ 2 , with TRR 1 ≠TRR 2 , the optic coupling the first output beam and second output beam onto a common beam path through the amplifier, and wherein said coupling optic is positioned between two amplifier chambers on the common beam path.