An improved illumination system for spatial coherence control

Zhiqiang Liu; Takeshi Gemma; Joseph Rosen; Mitsuo Takeda

doi:10.1117/12.560350

An improved illumination system for spatial coherence control

Zhiqiang Liu, Takeshi Gemma, Joseph Rosen, Mitsuo Takeda

Department of Electrical & Computer Engineering

Research output: Contribution to journal › Conference article › peer-review

5 Scopus citations

Abstract

A longitude coherence control system needs a source that is temporally coherent and yet spatially incoherent. For this reason, a zone plate-like pattern is imaged onto a rotating ground glass. Generally the ground glass exhibits a strong directivity. It is far from an ideal uniform diffuser that is implicitly assumed in the theory. To solve this problem, we propose a new illumination system. In our system, the beam illuminating the zone plate-like pattern is focused on the test surface. We measured the longitudinal coherence functions in our optical system. The result shows that the longitude coherent function is better controlled in our interferometer.

Original language	English
Article number	25
Pages (from-to)	220-227
Number of pages	8
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	5531
DOIs	https://doi.org/10.1117/12.560350
State	Published - 1 Dec 2004
Event	Interferometry XII: Techniques and Analysis - Denver, CO, United States Duration: 2 Aug 2004 → 3 Aug 2004

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

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10.1117/12.560350

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title = "An improved illumination system for spatial coherence control",

abstract = "A longitude coherence control system needs a source that is temporally coherent and yet spatially incoherent. For this reason, a zone plate-like pattern is imaged onto a rotating ground glass. Generally the ground glass exhibits a strong directivity. It is far from an ideal uniform diffuser that is implicitly assumed in the theory. To solve this problem, we propose a new illumination system. In our system, the beam illuminating the zone plate-like pattern is focused on the test surface. We measured the longitudinal coherence functions in our optical system. The result shows that the longitude coherent function is better controlled in our interferometer.",

author = "Zhiqiang Liu and Takeshi Gemma and Joseph Rosen and Mitsuo Takeda",

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T1 - An improved illumination system for spatial coherence control

AU - Liu, Zhiqiang

AU - Gemma, Takeshi

AU - Rosen, Joseph

AU - Takeda, Mitsuo

PY - 2004/12/1

Y1 - 2004/12/1

N2 - A longitude coherence control system needs a source that is temporally coherent and yet spatially incoherent. For this reason, a zone plate-like pattern is imaged onto a rotating ground glass. Generally the ground glass exhibits a strong directivity. It is far from an ideal uniform diffuser that is implicitly assumed in the theory. To solve this problem, we propose a new illumination system. In our system, the beam illuminating the zone plate-like pattern is focused on the test surface. We measured the longitudinal coherence functions in our optical system. The result shows that the longitude coherent function is better controlled in our interferometer.

AB - A longitude coherence control system needs a source that is temporally coherent and yet spatially incoherent. For this reason, a zone plate-like pattern is imaged onto a rotating ground glass. Generally the ground glass exhibits a strong directivity. It is far from an ideal uniform diffuser that is implicitly assumed in the theory. To solve this problem, we propose a new illumination system. In our system, the beam illuminating the zone plate-like pattern is focused on the test surface. We measured the longitudinal coherence functions in our optical system. The result shows that the longitude coherent function is better controlled in our interferometer.

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U2 - 10.1117/12.560350

DO - 10.1117/12.560350

M3 - Conference article

AN - SCOPUS:15744388667

SN - 0277-786X

VL - 5531

SP - 220

EP - 227

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

M1 - 25

T2 - Interferometry XII: Techniques and Analysis

Y2 - 2 August 2004 through 3 August 2004

ER -

An improved illumination system for spatial coherence control

Abstract

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