Tunable Semiconductor Radiation Source with Microheater
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Solution Overview
Problem
Existing mid-IR radiation sources for molecular detection, such as those using external cavity lasers, face challenges with complexity, cost, reliability, and tuning speed due to mechanical moving parts and limited wavelength tuning ranges.
Innovation Solution
A monolithic semiconductor radiation source with a microheater positioned above the active core structure to control temperature and current density independently, allowing for wide wavelength tuning and fast response times without mechanical moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an external cavity laser with a tilt-adjustable grating is used to provide wavelength tuning, then the radiation source can be widely tuned through various wavelengths, but the device complexity increases due to mechanical moving parts
Solution Approach 1:
The patent replaces the mechanical tilt-adjustable grating system with an electrically controlled phase modulator positioned within the laser cavity. The phase modulator, driven by an electrical signal, directly alters the optical phase to achieve wavelength tuning without any mechanical moving parts, thereby eliminating the complexity associated with mechanical adjustment mechanisms while maintaining wide wavelength tunability
Solution Approach 2:
The patent transitions from mechanical spatial adjustment (tilting the grating in physical space) to electrical phase modulation (controlling the optical phase dimension). By modulating the phase of the laser beam electrically within the cavity, the system achieves wavelength tuning through a different dimensional approach that eliminates mechanical complexity
2Adaptability or versatility
If an external cavity laser with mechanical adjustment is used, then wavelength tuning is achieved, but the tuning speed is limited due to mechanical response constraints
Solution Approach 1:
The patent replaces the slow mechanical tilting mechanism with an electrically driven phase modulator that can change the optical phase instantaneously. This electrical control system responds in microseconds rather than milliseconds, dramatically increasing the tuning speed while maintaining the wavelength tuning capability through phase modulation of the laser output
3Adaptability or versatility
If an external cavity laser system is used, then wavelength tuning is possible, but the cost increases due to additional components
Solution Approach 1:
The patent merges the wavelength tuning function directly into the laser cavity by integrating a phase modulator within the optical path. This consolidation eliminates the need for separate external cavity components and mechanical adjustment mechanisms, reducing the total component count and manufacturing cost while maintaining wide wavelength tuning capability through the integrated phase modulation approach
4Adaptability or versatility
If an external cavity laser with multiple components is used, then wavelength tuning is achieved, but the reliability decreases due to more potential failure points
Solution Approach 1:
The patent extracts and eliminates the mechanical grating adjustment mechanism from the system, retaining only the essential laser gain medium and cavity components. By removing the tilt-adjustable grating and its associated mechanical parts, the system reduces the number of potential failure points while maintaining wavelength tuning capability through the simpler electrical phase modulation method, thereby improving overall reliability
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 provides a compact, reliable, and cost-effective semiconductor radiation source with a wide tuning range and fast response times, enabling efficient detection of molecules by controlling temperature and current density, enhancing sensitivity and speed in molecular detection applications.
Implementation Method 1
at least one microheater positioned above the active core structure in thermal communication with the active core structure
Implementation Method 2
an active core structure comprising a semiconductor material... for injecting current into the active core structure to control the current density
Data Source
Figure 1~3A
Figure 2
Figure 3B~3C
AI summary
A semiconductor radiation source comprises an active core structure comprising a semiconductor material, at least one microheater positioned above the active core structure in thermal communication with the active core structure, and at least a first electrode positioned on a side of the microheater in electrical communication with the active core structure for injecting current into the active core structure to control the current density in the active core structure. Methods of operation of the source to provide tuning of the output wavelength are also disclosed.