Laser Diode Module Beam Compression for Fiber Coupling
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Solution Overview
Problem
Current high-power laser diode modules are limited by insufficient brightness and power output, particularly in applications requiring high power, leading to the need for complex optics and high-cost power supplies, and increasing the module's bulkiness when trying to enhance output by adding more diodes.
Innovation Solution
A novel laser diode module configuration with a single case package housing multiple independent laser diodes and optical components arranged in a step-wise manner, incorporating a beam compression unit to narrow collimated light beams for efficient coupling into an optical fiber, allowing for higher power output without increasing module size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of laser diodes is increased to achieve higher power output, then the power output is improved, but the module becomes bulkier and longer
Solution Approach 1:
The patent transitions from a linear arrangement of laser diodes to a three-dimensional stacked configuration where multiple diodes are mounted vertically on different levels of the heat sink. This dimensional change allows multiple diodes to be packed into a compact footprint, achieving high power output without proportionally increasing module length.
Solution Approach 2:
The patent implements a nested structure where multiple laser diodes are arranged in a hierarchical stacking pattern, with each subsequent diode positioned below and offset from the previous one. This nesting approach maximizes space utilization and allows the optical system to collect light from all diodes through a single objective lens.
2Reliability
If specialized optics are used to achieve reasonable coupling efficiencies for small-diameter rod lasers, then the coupling efficiency is improved, but the cost and complexity of the optical system increases
Solution Approach 1:
The patent divides the optical system into distinct functional segments: fast-axis cylindrical lenses for each diode, slow-axis cylindrical lenses for beam shaping, and a single objective lens for final coupling. This segmentation allows each component to be optimized for its specific function while maintaining overall system simplicity.
Solution Approach 2:
The patent employs a universal objective lens that serves all laser diodes in the array, collecting light from multiple sources simultaneously. This multi-functional approach eliminates the need for individual coupling optics for each diode, reducing overall system complexity while maintaining high coupling efficiency.
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 achieves high-powered and bright output light efficiently, preventing light loss and reducing the need for bulky structures, making it suitable for various applications including machining and optically pumping lasers.
Implementation Method 1
a beam compression unit configured to reduce a cross section of the collimated light beams emitted by the laser diodes so as to effectively and losslessly couple all the collimated beams into an objective lens
Implementation Method 2
Each of the laser diodes is aligned with a collimating lens assembly configured to collimate light emitted by the respective laser diode
Implementation Method 3
a standard, regularly sized objective lens configured to couple the compressed light beams into an output fiber
Data Source
AI summary
A high-brightness laser module is configured with a beam-compression unit capable of reducing a diameter of parallel light beams which are emitted by respective spaced apart individual laser diodes. The module further has an objective lens configured to losslessly launch the light with the reduced diameter into a fiber.