Uncooled External Cavity Laser Thermal Management
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Solution Overview
Problem
Portable Raman applications require a low-power, uncooled semiconductor laser that can maintain a stable, narrow-linewidth signal over a wider operating temperature range, as existing uncooled lasers are limited by temperature sensitivity and power consumption.
Innovation Solution
Incorporating a heater into the laser package to maintain the laser within its operating temperature range, allowing it to operate efficiently across a broader temperature range from −30° C. to 60° C., while minimizing power consumption and maintaining spectral purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermo-electric cooler (TEC) is used to stabilize the laser's operating temperature, then the laser's operating wavelength and linewidth are stabilized, but power consumption increases substantially
Solution Approach 1:
The patent changes the temperature control approach from active cooling (TEC) to passive thermal management through mechanical design. The laser assembly is mounted on a platform with specific thermal conductivity properties that passively maintain the laser within its operating temperature range, eliminating the need for high-power TEC stabilization while preserving wavelength stability
2Use of energy by moving object
If an uncooled laser is used to reduce power consumption, then power consumption decreases, but the laser can only operate over a limited temperature range
Solution Approach 1:
The patent modifies the thermal parameters of the laser assembly by selecting materials with specific thermal conductivity values for the platform and mounting structures. This passive thermal design enables the uncooled laser to operate across an extended temperature range (−30° C. to 60° C.) while maintaining low power consumption and stable performance
3Use of energy by moving object
If the laser operates over an extended temperature range without a TEC, then power consumption is reduced, but temperature sensitivity causes detuning and wavelength changes
Solution Approach 1:
The patent optimizes the thermal conductivity parameters of the platform and mounting structures to create a passive thermal management system. This design maintains the laser temperature within acceptable limits across an extended operating range, preserving wavelength stability without requiring active TEC cooling
Solution Approach 2:
The patent introduces a thermally conductive platform as an intermediary between the laser and the external environment. This platform acts as a thermal mediator that passively regulates the laser temperature, preventing excessive temperature variations that would cause wavelength detuning while avoiding the need for active cooling
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 enables a low-power, uncooled external cavity laser to provide stable, narrow-linewidth signals over an extended temperature range, reducing power consumption and enhancing operational efficiency in portable Raman instruments.
Implementation Method 1
a heater; wherein the heater is configured to heat the laser when the laser package is positioned in an environment having an ambient temperature which lies outside of the operating temperature range of the laser
Data Source
AI summary
A laser package comprising a semiconductor laser having an operating temperature range and a heater, wherein the heater is configured to heat the laser when the laser package is positioned in an environment having an ambient temperature which lies outside of the operating temperature range of the laser, so that the laser will remain within the operating temperature range.