IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0966423
(2010-12-13)
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등록번호 |
US-8340151
(2012-12-25)
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발명자
/ 주소 |
- Liu, Bo
- Liu, Yun
- Braiman, Yehuda Y.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
5 인용 특허 :
7 |
초록
▼
A system and method for addition of broad-area semiconductor laser diode arrays are described. The system can include an array of laser diodes, a V-shaped external cavity, and grating systems to provide feedback for phase-locking of the laser diode array. A V-shaped mirror used to couple the laser d
A system and method for addition of broad-area semiconductor laser diode arrays are described. The system can include an array of laser diodes, a V-shaped external cavity, and grating systems to provide feedback for phase-locking of the laser diode array. A V-shaped mirror used to couple the laser diode emissions along two optical paths can be a V-shaped prism mirror, a V-shaped stepped mirror or include multiple V-shaped micro-mirrors. The V-shaped external cavity can be a ring cavity. The system can include an external injection laser to further improve coherence and phase-locking.
대표청구항
▼
1. A system for coherent addition of broad-area laser diode emissions, comprising: an array of broad-area laser diodes, wherein each broad-area laser diode emits radiation and adjacent broad-area laser diodes are separated by a distance (dpitch); anda V-shaped cavity, wherein a laser beam emitted fr
1. A system for coherent addition of broad-area laser diode emissions, comprising: an array of broad-area laser diodes, wherein each broad-area laser diode emits radiation and adjacent broad-area laser diodes are separated by a distance (dpitch); anda V-shaped cavity, wherein a laser beam emitted from said system is coherent at a wavelength (λ) and wherein said V-shaped cavity comprises: a V-shaped reflector arranged to split radiation emitted from each of said broad-area laser diodes into a first beam traveling along a first optical path and a second beam traveling along a second optical path, wherein said V-shaped reflector is selected from the group consisting of a V-shaped prism reflector, a V-shaped stepped reflector and an array of micro-prism reflectors,a fast-axis correction lens disposed between said array of broad-area laser diodes and said V-shaped reflector,a cylindrical lens, having a focal distance (f), and a grating arranged sequentially along said first optical path, wherein said grating is arranged to direct first-order diffraction at said wavelength (λ) toward said array of broad-area laser diodes, anda second cylindrical lens, having a second focal distance (f2), and a second grating arranged sequentially along said second optical path, wherein said second grating is arranged to direct first-order diffraction at said wavelength (λ) toward said array of broad-area laser diodes, wherein a distance along said second optical path between said second cylindrical lens and said second grating is equal to said second focal distance (f2). 2. The system according to claim 1, wherein a distance along said first optical path between said cylindrical lens and said grating is substantially equal to a sum of said focal distance (f) and a half-Talbot distance (Zt/2), wherein Zt=2dpitch2/λ. 3. The system according to claim 1, wherein said broad-area laser diodes operate in multiple-transverse modes. 4. The system according to claim 1, further comprising a stepped, phase compensation plate arranged along said first optical path positioned between said V-shaped reflector and said cylindrical lens. 5. The system according to claim 1, further comprising: an optical coupler arranged along said first optical path or said second optical path, wherein said optical coupler reflects a first portion of said first beam, said second beam or both, and transmits out of said system a laser beam comprising a second portion of said first beam, said second beam or both. 6. The system according to claim 1, wherein said V-shaped reflector comprises an array of micro-prism reflectors. 7. The system according to claim 6, wherein at least one of said micro-prism reflectors is independently adjustable. 8. The system according to claim 1, further comprising an external injection laser arranged to emit a locking laser beam along a second optical path into said array of broad-area laser diodes. 9. The system according to claim 1, wherein said array of broad-area laser diodes is one of a one-dimensional linear array or a two-dimensional stacked array. 10. A system for coherent addition of broad-area laser diode emissions, comprising: an array of broad-area laser diodes, wherein each broad-area laser diode emits radiation and adjacent broad-area laser diodes are separated by a distance (dpitch); anda V-shaped cavity, wherein a laser beam emitted from said system is coherent at a wavelength (λ) and wherein said V-shaped cavity comprises: a V-shaped reflector arranged to split radiation emitted from each of said broad-area laser diodes into a first beam traveling along a first optical path and a second beam traveling along a second optical path, wherein said V-shaped reflector is selected from the group consisting of a V-shaped prism reflector, a V-shaped stepped reflector and an array of micro-prism reflectors,a fast-axis correction lens disposed between said array of broad-area laser diodes and said V-shaped reflector, anda cylindrical lens, having a focal distance (f), and a grating arranged sequentially along said first optical path, wherein said grating is arranged to direct first-order diffraction at said wavelength (λ) toward said array of broad-area laser diodes,wherein said V-shaped cavity is a ring cavity and said first and second optical paths overlap in whole or in part. 11. A system for combining laser diode emissions, comprising: an array of broad-area laser diodes, wherein each broad-area laser diode emits radiation and adjacent broad-area laser diodes are separated by a distance (dpitch); anda V-shaped cavity, wherein a laser beam emitted from said system is coherent at a wavelength (λ), said V-shaped cavity comprising: a V-shaped reflector arranged to split radiation emitted from each of said broad-area laser diodes into a first beam traveling along a first optical path and a second beam traveling along a second optical path, wherein said V-shaped cavity is a ring cavity and said first and second optical paths overlap in whole or in part, anda fast-axis correction lens disposed between said array of broad-area laser diodes and said V-shaped reflector. 12. The system according to claim 11, further comprising: a cylindrical lens, having a focal distance (f), anda grating arranged sequentially along said first optical path, wherein said grating is arranged to direct first-order diffraction at said wavelength (λ) toward said array of broad-area laser diodes, wherein a distance along said first optical path between said cylindrical lens and said grating is a sum of said focal distance (f) and a half-Talbot distance (Zt/2), wherein Zt=2dpitch2λ. 13. The system according to claim 11, further comprising: an optical coupler arranged along said first optical path or said second optical path, wherein said optical coupler reflects a first portion of said first beam, said second beam or both, and transmits out of said system a laser beam comprising a second portion of said first beam, said second beam or both. 14. A system for coherent addition of laser diode emissions, comprising: an array of broad-area laser diodes, wherein each laser diode emits radiation and adjacent broad-area laser diodes are separated by a distance (dpitch); anda V-shaped cavity, wherein a laser beam emitted from said system is coherent at a wavelength (λ) and wherein said V-shaped cavity comprises: a V-shaped reflector arranged to split radiation emitted from each of said broad-area laser diodes into a first beam traveling along a first optical path and a second beam traveling along a second optical path, wherein said V-shaped reflector is selected from the group consisting of a V-shaped prism reflector, a V-shaped stepped reflector and an array of micro-prism reflectors,a fast-axis correction lens disposed between said array of broad-area laser diodes and said V-shaped reflector,an external injection laser arranged to emit a locking laser beam along a second optical path into said array of broad-area laser diodes,at least one optical isolator positioned along said second optical path between said external injection laser and said V-shaped reflector, wherein said at least one optical isolator prevents electromagnetic radiation emitted by said array of broad-area laser diodes from propagating to said external injection laser,a cylindrical lens, having a focal distance (f), anda grating arranged sequentially along said first optical path, wherein said grating is arranged to direct first-order diffraction at said wavelength (λ) toward said array of broad-area laser diodes,wherein said V-shaped cavity is a ring cavity and said first and second optical paths overlap in whole or in part. 15. The system according to claim 14, wherein a distance along said first optical path between said cylindrical lens and said grating is substantially equal to a sum of said focal distance (f) and a half-Talbot distance (Zt/2), wherein Zt=2dpitch2/λ. 16. The system according to claim 1, wherein said V-shaped reflector comprises a stepped reflector.
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