Laser Light Source Module With Face-To-Face LD Assemblies
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Solution Overview
Problem
Existing laser light source modules face challenges in reducing divergence angles of light beams, leading to increased optical coupling loss and decreased light emission efficiency due to the spread of light-emitting points and limited heat dissipation, especially when multiple laser diodes are used.
Innovation Solution
A laser light source module design featuring parallel-mounted laser assemblies with each assembly having a holding block and sub-mount, allowing for close arrangement of laser devices while ensuring effective heat dissipation through a large junction area, thereby maintaining a small divergence angle and reducing optical coupling loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple LD elements are arranged in a uniaxial direction on the same plane to increase optical output, then the optical output is improved, but the divergence angle becomes larger and optical coupling loss increases
Solution Approach 1:
The patent transitions from uniaxial arrangement to a planar two-dimensional arrangement where multiple LD elements are disposed on different planes (first plane and second plane) with their light-emitting surfaces facing each other. This dimensional change allows close arrangement while maintaining small divergence angles, resolving the contradiction between increasing optical output and controlling beam divergence.
Solution Approach 2:
The patent employs a stacked configuration where LD elements are nested in layers on different planes, with each layer containing LD elements whose light-emitting surfaces face each other. This nesting approach enables dense packing of multiple LD elements while maintaining compact light emission geometry, thereby increasing optical output without significantly increasing divergence angle.
2Power
If LD elements are mounted on side surfaces of a common holding member to improve optical output, then the optical output is improved, but the distance between LD chips cannot be shortened and divergence angle increases
Solution Approach 1:
The patent moves from side-surface mounting to face-to-face mounting on parallel planes, enabling much shorter distances between LD chips. By arranging light-emitting surfaces facing each other on different planes, the patent achieves compact spacing that reduces divergence angle while maintaining high optical output.
3Loss of energy
If laser devices are closely arranged to reduce divergence angle, then optical coupling loss is reduced, but heat dissipation becomes difficult
Solution Approach 1:
The patent divides the mounting structure into separate holding members or distinct mounting regions for different LD elements. This segmentation allows each LD element to have its own heat dissipation path and mounting surface, enabling close arrangement for reduced divergence while maintaining effective heat dissipation through separate thermal management for each 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 design achieves reduced optical coupling loss and enhanced heat dissipation, maintaining high light emission efficiency by closely arranging laser devices and ensuring favorable heat transfer, even when using multiple laser diodes with different wavelength bands.
Implementation Method 1
a laser device (LD) emitting a laser light L along an optical axis
Implementation Method 2
favorable heat transfer can be achieved from the laser devices to the base plate
Data Source
AI summary
The purpose of the present invention is to provide a laser light source module that is capable of heat dissipation from a laser device and of suppressing the diffusion of a light beam due to the close arrangement of the laser device. The laser light source module comprises a stem that is a base plate and first and second laser assemblies disposed on the stem. Each of the laser assemblies comprises a multi-emitter LD bar that is a laser device emitting a laser light along an optical axis, and a holding member having a mounting surface parallel to the axis, the multi-emitter LD bar being mounted on the mounting surface. The first and second laser assemblies are positioned such that the optical axes of the assemblies are parallel to each other and that the mounting surfaces of the assemblies are arranged opposite to each other in parallel.