Light-Emitting Module Mirror Layout for Laser Beam Combining
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Solution Overview
Problem
Existing light-emitting modules using semiconductor laser elements face challenges in effectively combining laser beams due to deviations in the traveling direction of the laser beams from the designed path.
Innovation Solution
A light-emitting module comprising a support base with placement surfaces, light-emitting devices with a semiconductor laser element, first and second mirror members, and a condensing lens, which aligns and combines the laser beams by reflecting them through a series of mirror surfaces and a condensing lens to direct them into an optical fiber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple semiconductor laser elements are used to increase output power, then the power of the laser beam is improved, but the deviation in traveling direction of the laser beams increases
Solution Approach 1:
An optical component with a first reflective surface and a second reflective surface is introduced as an intermediary to redirect laser beams from multiple semiconductor laser elements. The first reflective surface receives laser beams from different elements and reflects them toward a common path, while the second reflective surface further directs them parallel to each other, enabling effective combination of high-power beams with consistent traveling direction.
Solution Approach 2:
The optical component utilizes three-dimensional spatial arrangement of reflective surfaces to transform the traveling directions of laser beams. By positioning the first and second reflective surfaces at specific angles and locations, the system converts divergent beams from multiple elements into parallel beams, effectively adding a dimensional transformation approach to solve the alignment problem.
2Productivity
If the traveling direction of laser beams is corrected to improve combination efficiency, then the beam alignment is improved, but the device complexity increases
Solution Approach 1:
The optical component merges the functions of multiple beam direction corrections into a single integrated structure. By combining the first reflective surface for receiving and initial redirecting, and the second reflective surface for final parallel alignment, the system achieves effective beam combination in one component rather than requiring separate adjustment mechanisms for each laser element.
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 module effectively reduces deviations in the laser beam direction, allowing for the efficient combination and alignment of multiple laser beams, thereby increasing the output power of the combined light emitted from the optical fiber.
Implementation Method 1
The first reflective surface reflects the laser beam to change a traveling direction of the laser beam to a direction away from the mounting surface of the substrate
Implementation Method 2
The second reflective surface reflects the laser beam reflected by the first reflective surface to further change the traveling direction of the laser beam to a second direction intersecting the first direction
Implementation Method 3
each of the plurality of third mirror members has a third reflective surface that reflects the laser beam traveling in the second direction to change the traveling direction of the laser beam to the first direction
Implementation Method 4
the condensing lens combines a plurality of laser beams obtained by the laser beams emitted from the plurality of light-emitting devices being reflected by the third reflective surface, and allows the combined light to be incident on an optical fiber
Data Source
Figure 1A
Figure 1B~1C
Figure 1D
AI summary
A light-emitting module includes: a support base having a plurality of placement surfaces arranged in a first direction; a plurality of light-emitting devices each disposed on the respective corresponding placement surface, and each including a semiconductor laser element, a first mirror member, a cover, and a second mirror member; a plurality of third mirror members; and a condensing lens. The first mirror member changes a traveling direction of a laser beam emitted from the semiconductor laser element. The cover transmits the laser beam having the changed traveling direction. The second mirror member further changes the traveling direction of the laser beam transmitted through the cover to a second direction. Each third mirror member changes the traveling direction of the laser beam from the second direction to the first direction. The condensing lens combines a plurality of laser beams and allows the combined light to be incident on an optical fiber.