US 12,132,296 B2
Laser having reduced coherence via a phaser shifter
Shiva Shahin, Seattle, WA (US); and Dale Eugene Zimmerman, Redmond, WA (US)
Assigned to Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed by Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed on May 14, 2021, as Appl. No. 17/321,074.
Prior Publication US 2022/0368105 A1, Nov. 17, 2022
Int. Cl. H01S 5/0625 (2006.01); G02B 27/01 (2006.01); G02B 27/48 (2006.01); H01S 5/026 (2006.01); H01S 5/06 (2006.01); H01S 5/065 (2006.01); H01S 5/40 (2006.01)
CPC H01S 5/0625 (2013.01) [G02B 27/0172 (2013.01); G02B 27/48 (2013.01); H01S 5/026 (2013.01); H01S 5/0652 (2013.01); G02B 2027/0178 (2013.01); H01S 5/0614 (2013.01); H01S 5/4012 (2013.01); H01S 5/4093 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A laser device, comprising:
a laser having an optical cavity including an active gain section and a phase shifter;
a waveguide configured to receive lased light emitted from the laser; and
a controller configured to 1) excite the active gain section to lase light out of the optical cavity and 2) while the light is being lased out of the optical cavity, modulate a refractive index of the phase shifter to shift an optical phase of lasing modes of the lased light to thereby reduce coherence of the lased light and increase an exponential decay rate of a coherence function of the lased light high enough to mitigate fringe interference due to overlap between lasing modes of the lased light and waveguide-defined fringes of the waveguide.