Laser Converging Optics With Double Telecentric Image Transfer
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Solution Overview
Problem
Existing laser processing devices face challenges in maintaining device size while allowing components on the converging optical system to move with respect to the object being processed, and in accommodating varying laser light wavelengths and accurately transferring the image of laser light on a reflective spatial light modulator to the entrance pupil plane of the converging optical system.
Innovation Solution
The laser processing device includes a movable laser converging unit with a reflective spatial light modulator, a converging optical system, and an imaging optical system forming a double telecentric optical system. This configuration allows for the movement of components without increasing device size, supports the use of multiple laser light sources with different wavelengths, and ensures accurate image transfer of the laser light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If components on the converging optical system side are moved with respect to the object to be processed, then processing flexibility is improved, but device size increases
Solution Approach 1:
The device is divided into a stationary laser output unit and a movable laser converging unit. By segmenting the system, only the necessary converging components are moved while the laser source remains fixed, achieving processing flexibility without proportionally increasing overall device size.
Solution Approach 2:
The laser converging unit is moved along the optical axis (depth dimension) rather than laterally, allowing focus adjustment and processing flexibility while maintaining a compact footprint in the horizontal plane.
2Adaptability or versatility
If a reflective spatial light modulator is used to modulate laser light, then processing capability is improved, but accurate image transfer to the entrance pupil plane becomes difficult
Solution Approach 1:
An imaging optical system is introduced as an intermediary between the reflective spatial light modulator and the converging optical system. This imaging system accurately transfers the modulated laser light image to the entrance pupil plane, resolving the precision issue while maintaining processing capability.
Solution Approach 2:
The imaging optical system serves multiple functions: it transfers the image accurately, maintains the telecentric property, and works with different laser wavelengths, making the system versatile and precise simultaneously.
3Adaptability or versatility
If multiple laser light sources with different wavelengths are used, then adaptability is improved, but device complexity increases
Solution Approach 1:
The laser converging unit is designed with wavelength-universal components including the reflective spatial light modulator and imaging optical system. This allows the same hardware configuration to handle multiple laser wavelengths without increasing complexity, achieving adaptability through universal design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables the laser processing device to move components on the converging optical system while maintaining device size, supports the use of multiple laser wavelengths, and ensures accurate image transfer, thereby enhancing processing capabilities and flexibility.
Implementation Method 1
a reflective spatial light modulator configured to reflect the laser light while modulating the laser light
Implementation Method 2
an imaging optical system constituting a double telecentric optical system in which a reflective surface of the reflective spatial light modulator and an entrance pupil plane of the converging optical system are in an imaging relationship
Implementation Method 3
a converging optical system configured to converge the laser light at the object to be processed
Data Source
AI summary
A laser processing device includes: a device frame; a support unit attached to the device frame and configured to support an object to be processed; a laser output unit attached to the device frame; and a laser converging unit attached to the device frame so as to be movable with respect to the laser output unit. The laser output unit includes a laser light source configured to emit laser light, and the laser converging unit includes: a reflective spatial light modulator configured to reflect the laser light while modulating the laser light; a converging optical system configured to converge the laser light at the object to be processed; and an imaging optical system constituting a double telecentric optical system in which a reflective surface of the reflective spatial light modulator and an entrance pupil plane of the converging optical system are in an imaging relationship.