All-Fiber SESAM Packaging with TEC Cooling
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Solution Overview
Problem
Current packaging methods for Semiconductor Saturable Absorber Mirrors (SESAMs) in mode-locked fiber lasers suffer from poor heat dissipation, short useful life, and complexity, making them unsuitable for large-scale commercial use and long-term stable operation.
Innovation Solution
An all-fiber airtight packaging structure incorporating a ceramic optical fiber ferrule connector, a SESAM fixed block, a Thermo Electric Cooler (TEC) chilling plate, a sealing shell, and a cover plate, which allows for excellent heat dissipation, reusability, and simple assembly, ensuring the SESAM operates within a narrow temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If SESAM is packaged directly on FC optical fiber patch cord, then structure is simple and cost is low, but heat dissipation performance is poor and useful life is short
Solution Approach 1:
The patent introduces a copper base as an intermediary component between the SESAM and the optical fiber patch cord. This copper base serves as a heat dissipation intermediary, conducting heat away from the SESAM effectively while maintaining the simplicity of the overall packaging structure. The copper base resolves the contradiction by providing thermal management without adding significant structural complexity.
Solution Approach 2:
The packaging structure combines multiple materials with different properties: copper base for heat dissipation, optical fiber for light transmission, and mounting structures for mechanical support. This composite approach allows the system to achieve both simple structure and excellent heat dissipation performance by leveraging the strengths of each material.
2Reliability
If SESAM is packaged on copper base with lens coupling, then heat dissipation performance is excellent, but structure is complicated and cost is high
Solution Approach 1:
The patent extracts the essential function of the copper base (heat dissipation) from the complex lens coupling system. By separating the heat dissipation function from the optical coupling function, the design achieves excellent heat dissipation performance while simplifying the overall structure. The copper base is retained for thermal management, but unnecessary optical components are removed.
Solution Approach 2:
The copper base performs dual functions: it provides mechanical support for mounting the SESAM and simultaneously serves as a heat dissipation sink. This self-service approach allows a single component to fulfill multiple roles, reducing overall structural complexity while maintaining excellent thermal performance.
3Object-affected harmful factors
If input light power is reduced to decrease heat of SESAM, then thermal damage is reduced, but laser output power is limited
Solution Approach 1:
The patent converts the harmful heat generated by high-power laser operation into a manageable parameter by implementing an active cooling system. The cooling apparatus removes heat at a rate that allows the SESAM to operate at high input powers without suffering thermal damage. This transforms the previously harmful thermal effect into a controllable parameter, enabling high output power operation.
Solution Approach 2:
The patent changes the thermal management parameter from passive heat accumulation to active heat removal. By introducing a cooling system that actively maintains the SESAM temperature within safe operating limits, the system can sustain high input light powers that would otherwise cause thermal damage, thereby achieving high laser output power.
4Duration of action of stationary object
If heat dissipation of SESAM is increased as much as possible, then useful life is extended, but packaging structure becomes more complex
Solution Approach 1:
The patent merges the mounting structure and heat dissipation structure into a single integrated copper base assembly. The copper base simultaneously provides mechanical support for mounting the SESAM and serves as a heat dissipation sink. This merging of functions extends the useful life of the SESAM through effective heat management while avoiding the need for separate, complex heat dissipation components.
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 solution significantly enhances the useful life of SESAMs, improves heat dissipation, and reduces production costs, making the technology more suitable for industrial applications and mass production while maintaining stability and compactness.
Implementation Method 1
a Thermo Electric Cooler (TEC) chilling plate (4), wherein the SESAM fixed block (3) is arranged above the TEC chilling plate (4), and the TEC chilling plate (4) is used to control the temperature of the SESAM fixed block (3)
Implementation Method 2
The all-fiber airtight packaging structure with semiconductor saturable absorber mirror comprises a ceramic optical fiber ferrule connector (1)
Implementation Method 3
The SESAM is a combination of a reflector and a saturable absorber. The SESAM includes a substrate used with GaAs, a semiconductor distributed Bragg mirror grown alternately by GaAs and AlAs, and an InGaAs/GaAs quantum well located above the distributed Bragg mirror
Data Source
AI summary
An all-fiber airtight packaging structure with semiconductor saturable absorber mirror includes a ceramic optical fiber ferrule connector, a SESAM, a SESAM fixed block, a TEC chilling plate, a sealing shell, and a cover plate. The cover plate seals the sealing shell by connecting to a sealing shell surface. The TEC chilling plate and the SESAM fixed block are set in the sealing shell. The SESAM fixed block is located above the TEC chilling plate. The SESAM is pasted on the SESAM fixed block. A sealing shell central hole is defined in the sealing shell. The ceramic optical fiber ferrule connector is entered into the sealing shell through the sealing shell central hole, and an output end of ceramic optical fiber ferrule connector is opposited to an end of SESAM which is mounted on the SESAM fixed block.