Multispectral Laser Time Division Multiplexing
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Solution Overview
Problem
Existing laser systems requiring multiple discrete output colors for applications like absorption spectroscopy are costly and complex due to the need for multiple lasers and optical components, as they often employ different cavity lengths for each color, leading to gain competition and increased circuitry complexity.
Innovation Solution
A laser cavity design with a wavelength-dependent delay element and a complementary wavelength-dependent delay element, providing a constant optical path length for all colors, allowing for time division multiplexing and independent control of monochromatic components, which reduces gain competition and simplifies circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different cavity lengths are used for each color, then multiple discrete output colors can be generated, but gain competition causes power fluctuation and device complexity increases
Solution Approach 1:
The patent segments the light pulse into different monochromatic components in the time domain by introducing a time delay for different wavelengths through the wavelength-dependent delay element. This allows each color to be processed independently in time, eliminating gain competition while maintaining multiple output colors.
Solution Approach 2:
The patent transitions from spatial separation (different cavity lengths for different colors) to temporal separation (time division multiplexing). By adding the time dimension to the solution, the system achieves multiple discrete output colors without the complexity of multiple cavity configurations.
2Adaptability or versatility
If multiple lasers and optical components are used, then multiple wavelengths can be provided, but system cost and size increase
Solution Approach 1:
The patent merges multiple laser functions into a single laser system by using time division multiplexing. A single laser cavity with a wavelength-dependent delay element can generate multiple discrete wavelengths sequentially in time, replacing the need for multiple separate lasers and their associated optical components.
Solution Approach 2:
The single laser system is designed to perform multiple functions by generating different wavelengths through temporal separation. The wavelength-dependent delay element enables the same laser cavity to produce multiple discrete output colors, making the system universal for applications requiring different wavelengths.
3Measurement precision
If optical paths are separated for each color, then absorption detection can be performed, but the need for multiple optical paths increases device complexity
Solution Approach 1:
The patent uses periodic time division multiplexing where different monochromatic components are sequentially directed through a single optical path. The laser generates pulses at different wavelengths in a periodic manner, allowing absorption detection for each wavelength using the same optical path at different time intervals.
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 enhances the control and consistency of multiple discrete monochromatic components, reducing power fluctuations and gain competition, while simplifying the control of optical amplifiers and enabling efficient time division demodulation, thus improving the overall performance and cost-effectiveness of laser systems.
Implementation Method 1
an optical amplifier receiving light and boosting the amplitude of the light by stimulated emission according to a control signal
Implementation Method 2
a wavelength-dependent delay element (WDE) temporally separating a multispectral light pulse into constituent monochromatic components
Data Source
AI summary
A laser provides a cavity with complementary wavelength-dependent delay elements to provide the same optical length but time-staggered light paths for different colors. This provides the ability to individually control multiple narrow bands of colors each in a separate time division window.