Patent ID: 9658461
Date: 2017-05-23
CPC Classifications: G02B,H01S

Claim:
1. A laser apparatus comprising: an array of beam emitters each emitting a beam of a different wavelength, each emitted beam having a fast diverging axis and a slow diverging axis; disposed optically downstream of the array of beam emitters, a fast-axis collimating lens for collimating the beams along the fast diverging axis; disposed optically downstream of the fast-axis collimating lens, a slow-axis collimating lens for reducing divergence of the beams along the slow diverging axis, wherein a distance between the slow-axis collimating lens and the array of beam emitters is selected to incompletely collimate the beams along the slow diverging axis and thereby introduce cross-talk between the fast diverging axis and slow diverging axis of each of the beams; disposed optically downstream of the slow-axis collimating lens, an optical rotator for rotating the beams, wherein a focal length of the optical rotator is selected to reduce the cross-talk arising from the incomplete collimation of the beams along the slow diverging axis; disposed optically downstream of the optical rotator, focusing optics for focusing the rotated beams toward a dispersive element; disposed optically downstream of the focusing optics, the dispersive element for receiving and dispersing the focused beams; and disposed optically downstream of the dispersive element, a partially reflective output coupler for receiving the dispersed beams, reflecting a first portion thereof back toward the dispersive element, and transmitting a second portion thereof as a multi-wavelength output beam.