US 11,940,652 B2
High-power all fiber telescope
Richard D. Faulhaber, San Carlos, CA (US); and Martin H. Muendel, Oakland, CA (US)
Assigned to Lumentum Operations LLC, San Jose, CA (US)
Filed by Lumentum Operations LLC, San Jose, CA (US)
Filed on Jun. 2, 2022, as Appl. No. 17/805,082.
Application 17/805,082 is a division of application No. 16/588,838, filed on Sep. 30, 2019, granted, now 11,360,269.
Claims priority of provisional application 62/813,486, filed on Mar. 4, 2019.
Prior Publication US 2022/0299710 A1, Sep. 22, 2022
Int. Cl. G02B 6/42 (2006.01); B23K 26/06 (2014.01); B23K 26/073 (2006.01); G02B 6/32 (2006.01); H01S 3/08 (2023.01)
CPC G02B 6/32 (2013.01) [B23K 26/0626 (2013.01); B23K 26/0648 (2013.01); B23K 26/073 (2013.01); G02B 6/4206 (2013.01); G02B 6/4296 (2013.01); H01S 3/08059 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
guiding a laser output from a first end of an optical waveguide to a second end of the optical waveguide; and
modifying the laser output by a fiber telescope coupled to the second end of the optical waveguide,
wherein the fiber telescope comprises a set of graded-index optical elements comprising:
a first graded-index optical element having a first core radius, and
a second graded-index optical element having a second core radius that is different from the first core radius,
wherein a diameter of the fiber telescope matches a diameter of the optical waveguide at the second end of the optical waveguide and
wherein the modifying includes at least one of:
a magnification of the laser output,
a demagnification of the laser output,
a shifting of an image plane relative to a caustic waist of the laser output, or
beam shaping of the laser output.