Patent ID: 9450374
Filing Date: 2016-09-20
CPC Classification: H01S

Claim Text:
1. A pump laser system for producing high power laser light of a predetermined pump wavelength comprising: a first laser emitting light at the predetermined pump wavelength; a second laser emitting light at a wavelength shorter than the predetermined pump wavelength; an optical arrangement configured to multiplex light from the first laser and the second laser into an output; and a length of regular single-mode optical fiber coupled at a proximal end to said output of said optical arrangement and providing Raman gain at the predetermined pump wavelength to convert the second laser light to light at the predetermined pump wavelength, said length of optical fiber providing Raman gain being a flexible cable for extending to a remotely located optical amplifier, wherein optical powers of the multiplexed first and second laser lights are at respective power levels that result in more power at said predetermined pump wavelength being delivered to a distal end of said length of optical fiber than would be the case if the optical power coupled into said length of optical fiber was entirely at said predetermined pump wavelength.