A Study on the Development of a White Light Source Module for a Large-Capacity Searchlight Using a Blue Laser Diode

In this paper, a large-capacity white light source module using a high-power blue laser diode and a reflective spaced phosphor was designed. The reflective spacing phosphor ensured thermal stability. The proposed white light module is a reflective phosphor structure with a bi-directional optical sys...

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Bibliographic Details
Published in:Electronics (Basel) 2023-02, Vol.12 (3), p.760
Main Authors: Lee, Seung-Min, Cho, Joon-Ho, Lee, Wan-Bum
Format: Article
Language:English
Subjects:
Bandpass filters
Collimation
Dichroism
Efficiency
Emitters
Energy consumption
Heat
Laser beams
Lasers
Lenses
Light emitting diodes
Light sources
Lighting
Modules
Optics
Phosphors
Product development
Propagation
Semiconductor lasers
Thermal stability
White light
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Summary:In this paper, a large-capacity white light source module using a high-power blue laser diode and a reflective spaced phosphor was designed. The reflective spacing phosphor ensured thermal stability. The proposed white light module is a reflective phosphor structure with a bi-directional optical system based on a rhombus prism lens. The rhombus prism optical system can greatly narrow the blue laser beam width and a long-wavelength band-pass filter of 500 nm or more is applied to change the movement path of the laser beam and transmit white light excited by the phosphor. A dichroic filter was applied to the fold mirror part and a planar convex lens was designed to focus the blue laser beam so that the phosphor was irradiated. Finally, a high-power white light source is obtained from the pre-optics unit to which the dichroic filter is applied. In order to use the proposed white light source as a searchlight, a divergence angle of 4° or less is required. For this implementation, a large-area collimating lens combining an aspheric condensing lens and an achromatic lens was applied. It was confirmed that the divergence angle of 4 degrees or less was satisfied at the focal length (FL) of 38.5 to 42.5 mm of the optical lens of the laser white light module emitter and the collimating optical system.
ISSN:2079-9292
2079-9292
DOI:10.3390/electronics12030760