Widely tunable infrared source system and method
A system and method for tuning and infrared source laser in the Mid-IR wavelength range. The system and method comprising, at least, a plurality of individually tunable emitters, each emitter emitting a beam having a unique wavelength, a grating, a mirror positioned after the grating to receive at least one refracted order of light of at least one beam and to redirect the beam back towards the grating, and a micro-electro-mechanical systems device containing a plurality of adjustable micro-mirrors.
1. A method of tuning a beam source, the method comprising:
providing a plurality of beam emitters each emitting a beam having a different wavelength;
converging the beams emitted by the beam emitters onto a grating, whereby the beams are split into a plurality of orders;
reflecting a first one of the orders through the grating and back to the plurality of beam emitters, whereby each beam is reflected back to the beam emitter from which it was emitted to thereby stabilize the beam to its different wavelength;
receiving a second one of the orders at an array of individually controllable reflectors; and
redirecting one or more of the beams within the second one of the orders, with one or more of the reflectors, back to the grating, whereby the one or more of the beams are transmitted as one or more tuned output beams.
2. The method of claim 1 , wherein the beams emitted by the beam emitters are converged onto the grating at least in part by an optical element.
3. The method of claim 1 , wherein convergence of the beams onto the grating arises at least in part due to positioning of beam emitters to emit beams that converge toward each other.
4. The method of claim 1 , wherein the grating comprises a reflective diffraction grating or a transmissive diffraction grating.
5. The method of claim 1 , further comprising redirecting one or more of the beams within the second one of the orders, with one or more of the reflectors, to a beam dump.
6. The method of claim 1 , further comprising collimating one or more of the tuned output beams.
7. The method of claim 1 , wherein the first one of the orders is reflected back to the plurality of beam emitters by a mirror, the mirror being spaced apart from the grating.
8. The method of claim 1 , wherein the array of individually controllable reflectors is at least a portion of a micro-electro-mechanical systems device.
9. The method of claim 1 , wherein the array of individually controllable reflectors is at least a portion of a digital light processing chip.
10. The method of claim 1 , wherein at least one of the beam emitters comprises a quantum cascade laser source.
11. A method of tuning a beam source, the method comprising:
providing a plurality of beam emitters each emitting a beam having a different wavelength;
converging the beams emitted by the beam emitters onto a grating;
after converging the beams onto the grating, reflecting a first portion of each beam back to the beam emitter by which it was emitted to thereby stabilize the beam to its different wavelength;
after converging the beams onto the grating, for at least one of the beams, reflecting a second portion of the beam, with one of a plurality of individually controllable reflectors, as a tuned output beam in a direction away from the plurality of beam emitters.
12. The method of claim 11 , wherein the beams emitted by the beam emitters are converged onto the grating at least in part by an optical element.
13. The method of claim 11 , wherein convergence of the beams onto the grating arises at least in part due to positioning of beam emitters to emit beams that converge toward each other.
14. The method of claim 11 , wherein the grating comprises a reflective diffraction grating or a transmissive diffraction grating.
15. The method of claim 11 , further comprising, for at least one of the beams, reflecting a second portion of the beam, with one of the plurality of individually controllable reflectors, to a beam dump.
16. The method of claim 11 , further comprising collimating the tuned output beam.
17. The method of claim 11 , wherein the first portion of each beam is reflected back to the plurality of beam emitters by a mirror, the mirror being spaced apart from the grating.
18. The method of claim 11 , wherein the array of individually controllable reflectors is at least a portion of a micro-electro-mechanical systems device.
19. The method of claim 11 , wherein the array of individually controllable reflectors is at least a portion of a digital light processing chip.
20. The method of claim 11 , wherein at least one of the beam emitters comprises a quantum cascade laser source.