发明名称 |
Controllable spatial incoherence echelon for laser |
摘要 |
A system for achieving very uniform illumination of a target. A beam of broadband spatially-coherent light is converted to light with a controlled spatial incoherence and focused on the target. An echelon-like grating breaks the beam up into a large number of differently delayed beamlets with delay increments larger than the coherence time of the beam, and a focusing lens overlaps the beamlets to produce at the target a complicated interference pattern modulated by a smooth envelope that characterizes the diffraction of an individual beamlet. On time scales long compared to the coherence time, the interference pattern averages out, leaving only the smooth diffraction envelope.
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申请公布号 |
US4521075(A) |
申请公布日期 |
1985.06.04 |
申请号 |
US19830472690 |
申请日期 |
1983.03.07 |
申请人 |
OBENSCHAIN, STEPHEN P.;LEHMBERG, ROBERT H. |
发明人 |
OBENSCHAIN, STEPHEN P.;LEHMBERG, ROBERT H. |
分类号 |
B23K26/06;G02B5/18;G02B27/09;G02B27/48;(IPC1-7):G02B5/18;H01S3/13;G21B1/00 |
主分类号 |
B23K26/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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