Frequency Shifting Optical Swept Light Source System
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Solution Overview
Problem
Conventional optical fiber lasers are limited to specific wavelength bands, primarily around 800 nm, 1.06 μm, or 1.55 μm, due to doped rare-earth elements, restricting their application in fields requiring different wavelengths, necessitating a light source system that can implement frequency shifting.
Innovation Solution
A frequency shifting optical swept light source system comprising a light source, amplifier, optical converter, and controller, where the optical converter includes a frequency shifter, second-order disperser, and self phase modulator to shift and compress the light spectrum, allowing adjustment of the repetition rate to position the spectrum within a predetermined frequency band, enabling broadband swept light generation across various wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical fiber lasers use doped rare-earth elements, then they can achieve stable laser output, but the wavelength range is limited to specific bands (800 nm, 1.06 μm, 1.55 μm)
Solution Approach 1:
The patent changes the fundamental parameter of light frequency through the optical converter, which shifts the frequency of amplified light and compresses its spectrum. This allows the system to overcome the fixed wavelength limitations of rare-earth element doped fibers while maintaining stable laser output through controlled frequency transformation.
Solution Approach 2:
The optical converter acts as an intermediary component between the amplifier and the final output, transforming the fixed wavelength light from the amplifier into variable wavelength light. This mediator enables wavelength flexibility without requiring changes to the core laser medium.
2Adaptability or versatility
If the optical converter shifts frequency and compresses spectrum, then the wavelength range is expanded beyond rare-earth element radiation wavelengths, but the device complexity increases
Solution Approach 1:
The system is divided into distinct functional modules: light source, amplifier, and optical converter. Each module performs a specific function, allowing for independent optimization and maintenance while achieving the overall goal of expanded wavelength range through the frequency-shifting optical converter.
3Manufacturing precision
If the repetition rate of light is adjusted to position the compressed spectrum, then the wavelength precision is improved, but the control complexity increases
Solution Approach 1:
The controller adjusts the repetition rate of light based on feedback regarding the position of the compressed spectrum, enabling precise wavelength positioning. This feedback mechanism allows for accurate control of the output wavelength while maintaining system stability.
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
Enables the generation of broadband light with a narrow wavelength full width at half maximum (FWHM) that can be instantaneously varied, effectively expanding the wavelength range to include frequencies beyond the typical rare-earth element radiation wavelengths, facilitating applications like optical coherence tomography.
Implementation Method 1
an optical converter configured to shift a frequency of the amplified light and to compress a spectrum of the amplified light
Implementation Method 2
a second-order disperser configured to disperse light processed by the frequency shifter, on a time axis
Implementation Method 3
a self phase modulator configured to compress a spectrum of the light received from the second-order disperser
Implementation Method 4
an amplifier configured to amplify the light output from the light source
Data Source
AI summary
Provided is a frequency shifting optical swept light source system. The system includes a light source that emits light; an amplifier that amplifies the light output from the light source; an optical converter that shifts a frequency of the amplified light and compresses a spectrum of the amplified light; and a controller that controls a current signal applied to the light source such that a repetition rate of the light output from the light source is adjusted, so that an intensity of the amplified light is adjusted, to thereby adjust a position of the compressed spectrum with respect to a predetermined frequency band.