Studies on system and measuring method of far-field beam divergency in near field by Ronchi ruling

Chenbo Zhou; Li Yang; Wenli Ma; Peiying Yan; Tianquan Fan; Shangfeng He

doi:10.1117/12.253084

3 October 1996 Studies on system and measuring method of far-field beam divergency in near field by Ronchi ruling

Chenbo Zhou, Li Yang, Wenli Ma, Peiying Yan, Tianquan Fan, Shangfeng He

Proceedings Volume 2899, Automated Optical Inspection for Industry; (1996) https://doi.org/10.1117/12.253084
Event: Photonics China '96, 1996, Beijing, China

Abstract

Up to now, as large as seven times of Rayleigh-range or more is needed in measuring the far-field Gaussian beam divergency. This method is very inconvenient for the determination of the output beam divergency of the industrial product such as He-Ne lasers and the measuring unit will occupy a large space. The measurement and the measuring accuracy will be greatly influenced by the environment. Application of the Ronchi ruling to the measurement of far-field divergency of Gaussian beam in near-field is analyzed in the paper. The theoretical research and the experiments show that this measuring method is convenient in industrial application. The measuring system consists of a precision mechanical unit which scans Gaussian beam with a microdisplaced Ronchi ruling, a signal sampling system, a single-chip microcomputer data processing system and an electronic unit with microprinter output. The characteristics of the system is stable and the repeatability errors of the system are low. The spot size and far-field divergency of visible Gaussian laser beam can be measured with the system.

Citation Download Citation

Chenbo Zhou, Li Yang, Wenli Ma, Peiying Yan, Tianquan Fan, and Shangfeng He "Studies on system and measuring method of far-field beam divergency in near field by Ronchi ruling", Proc. SPIE 2899, Automated Optical Inspection for Industry, (3 October 1996); https://doi.org/10.1117/12.253084

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KEYWORDS

Ronchi rulings

Gaussian beams

Near field

Helium neon lasers

Argon ion lasers

Laser applications

Data processing

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