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	Coherent beam combining of lasers using microlenses and diffractive coupling
	LEGER, JAMES R.; VELDKAMP, WILFRID B.; SCOTT, MILES L.
	1989-03-21
著作权人	MASSACHUSETTS INSTITUTE OF TECHNOLOGY
专利号	US4813762
国家	美国
文献子类	授权发明
其他题名	Coherent beam combining of lasers using microlenses and diffractive coupling
英文摘要	A diffractive lenslet array receives light from multiple lasers. The lenslet array is spaced apart from a partially reflecting mirror by a distance Z=nd2/ lambda where n is an integer or half integer, lambda is the laser wavelength and d is the spacing of the lenslets in the array. In a preferred embodiment the apparatus is a unitary design in which the lenslets are etched into one surface of a substrate and a parallel surface is coated to form the partially reflecting mirror. The lenslets abut one another to produce a fill factor (percentage of array containing light) close to one and each of the lenslets is a multistep diffractive lens. Diffractive speading over a round trip distance from lasers to mirror and back again causes feedback light from a single lenslet to couple into adjacent lenslets. The light from all the lenslets is coupled back into the laser waveguides efficiently only when the wavefront at each of the lenslets is flat, that is, when the phase of the feedback is uniform across a lenslet. Uniformity is achieved when the separation between lenslet array and mirror is the Talbot self-imaging condition set forth above.
公开日期	1989-03-21
申请日期	1988-02-11
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/45869]
专题	半导体激光器专利数据库
作者单位	MASSACHUSETTS INSTITUTE OF TECHNOLOGY
推荐引用方式 GB/T 7714	LEGER, JAMES R.,VELDKAMP, WILFRID B.,SCOTT, MILES L.. Coherent beam combining of lasers using microlenses and diffractive coupling. US4813762. 1989-03-21.

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