Multi-wavelength grating-outcoupled surface emitting laser system
View Patent ↗A surface emitting semiconductor laser system having four cavities that couple light from a single aperture. Each of the four cavities overlaps at the outcoupling aperture. Each cavity is fabricated to resonate at a different central wavelength, outputting a different frequency of light, each of which can be independently modulated.
1. A surface emitting semiconductor laser system, comprising:
a first cavity having a first reflector at a first end and a second reflector at a second end;
a second cavity having a third reflector at a first end and a fourth reflector at a second end;
a third cavity having a fifth reflector at a first end and a sixth reflector at a second end;
a fourth cavity having a seventh reflector at a first end and an eighth reflector at a second end;
wherein the second reflector is reflective of a first wavelength of light but transmissive of a second wavelength of light;
wherein the fourth reflector is reflective of the second wavelength but transmissive of the first wavelength;
wherein the sixth reflector is reflective of a third wavelength of light but transmissive of a fourth wavelength of light;
wherein the eighth reflector is reflective of the fourth wavelength but transmissive of light the third wavelength.
2. The system of claim 1 , wherein the first, second, third, and fourth cavities all overlap an outcoupling aperture.
3. The system of claim 1 , wherein each cavity resonates at a different wavelength.
4. The system of claim 1 , wherein the first, third, fifth, and seventh reflectors are shallow distributed Bragg reflector gratings.
5. The system of claim 1 , wherein the second, fourth, sixth, and eighth reflectors are deep distributed Bragg reflector gratings.