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	Method and apparatus for optical coherence tomography with a multispectral laser source
	FARMER, JASON N.; MIYAKE, CHARLES I.
	2003-03-25
著作权人	LOCKHEED MARTIN CORPORATION
专利号	US6538817
国家	美国
文献子类	授权发明
其他题名	Method and apparatus for optical coherence tomography with a multispectral laser source
英文摘要	A method and apparatus for performing optical coherence tomography using a wavelength multiplexed source is provided. The single output beam of the source is of a large bandwidth, thus providing a high resolution tomography system. In order to achieve high contrast as well, the wavelength multiplexed source has minimal wavelength separation between spectrally adjacent lasers and has an output beam with an approximately Gaussian spectral shape. The source is preferably comprised of one or more multi-gain element arrays multiplexed together within a single external resonator cavity. Interposed between the array and the resonator cavity output coupler are a collimating element and a diffraction grating. The collimating element can be a refractive optic, a reflective optic, or, for some applications, a ¼ pitch GRIN lens. The diffraction grating can either be transmissive or reflective. The combination of the diffraction grating and the collimating element forces each emitter within the array to lase at a distinct wavelength. In order to achieve an overall bandwidth greater than the gain bandwidth of a single emitter array, either multiple arrays of differing center wavelength are packaged together or a large array is used with a laterally varying quantum well thickness or epitaxy. An intracavity spatial filter can be used to improve the beam quality and reduce cross-talk. An optical coherence tomography imaging system is coupled to the resonator cavity.
公开日期	2003-03-25
申请日期	2000-10-17
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/45956]
专题	半导体激光器专利数据库
作者单位	LOCKHEED MARTIN CORPORATION
推荐引用方式 GB/T 7714	FARMER, JASON N.,MIYAKE, CHARLES I.. Method and apparatus for optical coherence tomography with a multispectral laser source. US6538817. 2003-03-25.

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