Prefabricated MOPA Laser Module for Precise SWIR Beam Alignment
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Solution Overview
Problem
Current MOPA laser systems for short-wave infrared (SWIR) wavelengths are challenging to manufacture in high volumes at low costs due to complex assembly processes and precise alignment requirements, particularly for high-power sources which demand complex beam-shaping optics and precise micro-positioning.
Innovation Solution
A consolidated MOPA laser module design featuring a prefabricated chassis with a master oscillator (MO) and power amplifier (PA) affixed to polished surfaces, utilizing a beam transfer system with optical elements for alignment and amplification, and incorporating a thermoelectric cooler and sensors for temperature and intensity control to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex beam-shaping optics and precise micro-positioning are used for high-power laser coupling, then coupling efficiency is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent implements pre-aligned optical modules where the master oscillator and power amplifier are pre-positioned and aligned within modular units before final assembly. This preliminary alignment action eliminates the need for complex real-time adjustment mechanisms during system assembly, reducing both device complexity and manufacturing cost while maintaining high coupling efficiency
Solution Approach 2:
The patent introduces intermediate optical elements and alignment fixtures that serve as mediators between the laser source and fiber coupling interface. These intermediary components simplify the direct coupling challenge by providing staged alignment references and beam conditioning, thereby reducing the overall system complexity required to achieve precise coupling
2Manufacturing precision
If multiple alignment tools and testing equipment are used for MOPA laser assembly, then alignment precision is improved, but assembly time and production cost increase
Solution Approach 1:
The patent incorporates pre-marked alignment surfaces and pre-positioned reference features on the chassis and optical components. These preliminary alignment preparations enable direct mechanical assembly with inherent alignment, eliminating the need for multiple iterative measurement and adjustment cycles with alignment tools, thereby dramatically reducing assembly time while maintaining precision
Solution Approach 2:
The patent designs self-aligning mechanical interfaces where the physical geometry of components (such as tapered mounts or complementary shaped interfaces) automatically guides proper positioning during assembly. This self-service alignment mechanism eliminates dependence on external alignment tools and testing equipment, reducing both assembly time and production complexity
3Measurement precision
If precise micro-positioning mechanisms are implemented for laser coupling, then coupling accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent introduces rigid positioning fixtures and precision-machined mounting structures as intermediary elements between the laser components and the chassis. These intermediary mechanical structures provide stable, precise positioning references that eliminate the need for complex active micro-positioning mechanisms with multiple actuators and control systems, thereby achieving high coupling accuracy with simpler, more cost-effective mechanical designs
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 design simplifies the alignment process, reduces production costs and assembly time, and enhances the efficiency of MOPA laser systems by ensuring precise alignment and temperature control, facilitating high-volume, low-cost manufacturing of SWIR lasers.
Implementation Method 1
incorporating a thermoelectric cooler and sensors for temperature and intensity control
Implementation Method 2
the BTS comprising a plurality of optical elements for transferring light outputted from the MO to the PA for amplification
Implementation Method 3
a prefabricated chassis, comprising a plurality of surfaces; a master oscillator laser (MO), enduringly affixed to at least one first surface out of the plurality of surfaces
Data Source
AI summary
Consolidated Master Oscillator Power Amplifier (MOPA) laser modules and method of fabrication thereof. A MOPA comprises a prefabricated chassis, comprising a plurality of surfaces, a master oscillator laser (MO), enduringly affixed to at least one first surface out of the plurality of surfaces, a power amplifier (PA), enduringly affixed to at least one second surface out of the plurality of surfaces, wherein a spatial relationship between the at least one first surface and the at least one second surface determines an alignment between the MO and the PA, and a beam transfer system (BTS), enduringly affixed to the prefabricated chassis, the BTS comprising a plurality of optical elements for transferring light outputted from the MO to the PA for amplification.