Laser Diode Bar Wavelength Beam Combining with Diffraction Grating
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Solution Overview
Problem
Existing light source devices that use wavelength beam combining to emit high-output laser light face challenges in reducing size and complexity due to the need for expensive condensing lenses and intricate assembly, especially when increasing the length of the linear array of laser elements.
Innovation Solution
A light source device configuration that includes a laser diode bar with multiple strips, a light guiding part with cores for each strip, a diffraction grating, and a resonator mirror, where light from the cores is incident on the diffraction grating at different angles, allowing diffracted light to be emitted along a single optical axis, and the resonator mirror is positioned to coincide with this axis for optical axis alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the length of the linear array of laser elements is increased to enhance output, then the output of laser light is improved, but the diameter of the condensing lens must be increased and assembly becomes complicated
Solution Approach 1:
The patent divides the linear array of laser elements into multiple sub-arrays, each with its own condensing lens and diffraction grating. This segmentation allows each subsystem to be independently assembled and aligned, reducing the overall assembly complexity while maintaining high output capability through combination of multiple sub-arrays.
Solution Approach 2:
The patent transitions from a one-dimensional linear array to a two-dimensional arrangement of multiple sub-arrays. By distributing laser elements across multiple sub-arrays arranged in space, the system achieves high output without requiring a single large condensing lens, thereby reducing assembly complexity.
2Power
If the length of the linear array is increased to enhance output, then the output of laser light is improved, but a very expensive lens is required for the condensing lens
Solution Approach 1:
The patent divides the linear array of laser elements into multiple sub-arrays, each with its own condensing lens and diffraction grating. This segmentation allows each subsystem to be independently assembled and aligned, reducing the overall assembly complexity while maintaining high output capability through combination of multiple sub-arrays.
Solution Approach 2:
The patent transitions from a one-dimensional linear array to a two-dimensional arrangement of multiple sub-arrays. By distributing laser elements across multiple sub-arrays arranged in space, the system achieves high output without requiring a single large condensing lens, thereby reducing assembly complexity.
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
This configuration enables a compact, high-output laser light source device that simplifies assembly and reduces size, avoiding the need for expensive lenses and complex alignment, while maintaining high output capabilities.
Implementation Method 1
a diffraction grating on which light emitted from the cores is incident; The cores are disposed so that light emitted from the cores is incident on one region of the diffraction grating at different angles. The diffraction grating has such a pattern that allows diffracted light of light incident on the diffracted grating from the cores is emitted along a single optical axis.
Implementation Method 2
a resonator mirror on which light emitted from the diffraction grating is incident. The resonator mirror is disposed in so that an optical axis of light emitted from the resonator mirror is coincident with the single optical axis of the diffracted light.
Data Source
AI summary
A light source device includes: a laser diode bar comprising a plurality of strips configured to emit light in a wavelength region with a predetermined width; a light guiding part comprising a plurality of cores, each of which corresponds to a respective one of the plurality of strips, and on each of which light emitted from the respective one of the strips is incident; a diffraction grating on which light emitted from the cores is incident; and a resonator mirror on which light emitted from the diffraction grating is incident. The cores are disposed such that light emitted from the cores is incident on a region of the diffraction grating at different angles. The diffraction grating comprises a pattern configured to diffract light incident on the diffraction grating from the cores such that the diffracted light is emitted along a single optical axis.