Patent ID: 11949211
Assignee: nan
Field: Optics (Instruments)
Classification: CPC H | IPC H

Claim 18:
19. A vertical-external-cavity surface-emitting laser (VECSEL) comprising:
a heat spreader, wherein the heat spreader comprises a first material having a first refractive index and wherein the heat spreader is cooled via direct contact with a cooling medium;
a semiconductor active region formed on a top surface of the heat spreader, wherein the semiconductor active region comprises a second material having a second refractive index; and
a high contrast grating formed on a top surface of the semiconductor active region, wherein the high contrast grating comprises a third material having a third refractive index, wherein a period, a fill factor, an etch depth, and an index of refraction of the high contrast grating are optimized such that a zero-order diffraction from the high contrast grating is minimized and higher diffraction orders transmitted to allow for total internal reflection at an interface of the heat spreader,
wherein the second refractive index is greater than the first refractive index and a fourth refractive index, wherein the fourth refractive index represents a medium that a pump laser beam propagates through that is incident on the high contrast grating.