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KMID : 1011420210260010065
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Journal of Korean Ophthalmic Optics Society
2021 Volume.26 No. 1 p.65 ~ p.72
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Line-Focusing Optical System of Laser Beam with Reverse-Biprism
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Lee Dong-Hee
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Abstract
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Purpose: This study aims to aid the development of a line-focusing optical system combining the emitting area beams of two LD stacks to produce a single-line beam.
Methods: By reversing the configuration of the biprism, which has been used in ophthalmic optical devices, a new reverse-biprism could be defined, which could be used to develop an optical system that combines the emitting area beams of the two LD stacks. Cylindrical lenses were introduced to allow the combined emitting area beams to be converted into a line beam shape, and the vertex angle of the reverse-biprism was used as an optimization variable for the uniformity of the irradiance of this line beam.
Results: The newly designed linefocusing optical system, which can combine the emitting area beams of two LDs to form a single-line beam, has characteristics such as 1 mm×40 mm (±10%) line beam shape size, less than 10% tolerance of the line beam irradiance uniformity at a working distance of 280 mm, and less than 25% at a working distance of 280 ±10 mm.
Conclusions: By applying the reverse-biprism redefined by reversing the base direction of the conventional biprism, we were able to design a line beam focusing optical system that could combine the emitting area beams of two LD stacks to produce a single-line beam. This reverse-biprism is expected to continue to play a role in the field of combining two isolated light sources in the future.
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KEYWORD
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Biprism, Reverse-biprism LD stack, Emitting area, Line-focusing optical system
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