Patent ID: RE40019

Claim:
A high-efficiency cladding pumping fiber laser apparatus comprising: a laser fiber having cladding with its having a core doped with at least one active species and defining an aperture , at least one laser diode array module , for emitting a laser beam with a beam spot dimension , an imaging optical system, wherein said the imaging optical system is disposed between said the laser diode array module and an the aperture of said the laser fiber and focuses the laser beam from said the laser diode array module onto the aperture of said the laser fiber; and wherein said the laser diode array module comprises at least one laser diode array with a the beam having fast and slow axis divergence, a collimating structure, and an optical relay system; and wherein said the imaging optical relay system has at least one optical element for beam relay and is disposed between said the laser diode array module and said the laser fiber, whereby the laser beam from said the laser diode array module is relayed to a more distant point with the beam spot dimension being kept substantially unchanged.