US 12,422,600 B1
Laser beam extraction using distributed bragg reflector (DBR) mirror systems with a piezoelectric layer
Srinivas Gandrothula, Palo Alto, CA (US); and Shuji Nakamura, Goleta, CA (US)
Assigned to Blue Laser Fusion, Inc., Palo Alto, CA (US)
Filed by Blue Laser Fusion, Inc., Palo Alto, CA (US)
Filed on Aug. 9, 2024, as Appl. No. 18/799,148.
Int. Cl. G02B 17/00 (2006.01); G02B 5/08 (2006.01); H02N 2/00 (2006.01); H02N 2/04 (2006.01)
CPC G02B 5/0833 (2013.01) [G02B 17/004 (2013.01); H02N 2/04 (2013.01); H02N 2/22 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A Variable Reflectance Distributed Bragg Reflector (VR-DBR) mirror device comprising:
a transparent substrate;
a plurality of stacked layers of materials with at least two different refractive indices to form a distributed Bragg reflector (DBR) overlying the transparent substrate:
a piezoelectric layer comprising a plurality of voids configured with a single or the plurality of stacked layers such that the piezoelectric layer is configured to the DBR;
at least one electrical contact coupled to the piezoelectric layer containing the voids, the electrical contact characterized by a conductive material; and
a electric energy coupled to the electrical contact and configured to supply an electric field in the piezoelectric layer containing the voids to alter a refractive index of the piezoelectric layer and change a reflection spectrum of the DBR to allow a laser beam to traverse through a portion of the DBR;
wherein at a wavelength of a laser emission of the laser beam, the DBR has an initial reflectivity of more than 99% that is changed to a reflectivity of 30% and less.