Color speckle measurement of white laser beam emitted from fiber output of RGB laser modules

Color speckle metrics of an RGB-combined white laser beam emitted from an optical fiber output of two types of RGB laser module are measured. A new method for eliminating the effects of a fiber far field pattern from the measured 2D speckle data is employed to calculate the speckle metrics with a st...

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Bibliographic Details
Published inOptical review (Tokyo, Japan) Vol. 26; no. 6; pp. 720 - 728
Main Authors Kinoshita, Junichi, Ochi, Keizo, Takamori, Akira, Yamamoto, Kazuhisa, Kuroda, Kazuo, Suzuki, Koji, Hieda, Keisuke
Format Journal Article
LanguageEnglish
Published Tokyo Springer Japan 01.12.2019
Subjects
Atomic
Japan
Laser Display and Lighting Conference (LDC' 19)
Lasers
Microwaves
Molecular
Optical and Plasma Physics
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Quantum Optics
RF and Optical Engineering
Special section: Regular Paper
Yokohama
Speckle
Color speckle
Laser module
Far field pattern
Optical fiber
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Summary:Color speckle metrics of an RGB-combined white laser beam emitted from an optical fiber output of two types of RGB laser module are measured. A new method for eliminating the effects of a fiber far field pattern from the measured 2D speckle data is employed to calculate the speckle metrics with a statistical accuracy. In this method, unspeckled 2D data of the far field pattern can be directly measured by opening the iris of the speckle measurement equipment. As a result, white photometric speckle contrast and color speckle distribution in CIE1931 chromaticity diagram are, for the first time, successfully obtained by eliminating the far field pattern effects.
ISSN:1340-6000
1349-9432
DOI:10.1007/s10043-019-00556-w