Synchronized Fiber Laser Pulses With Tunable Wavelength Filtering
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Solution Overview
Problem
Current coherent Raman spectroscopy (CRS) systems using solid-state lasers are bulky, unstable, and costly, making them unsuitable for clinical environments, while fiber-format lasers offer a more compact and cost-effective solution but often result in wide wavelength dispersion, reducing measurement accuracy.
Innovation Solution
A laser device utilizing nanomaterial-synchronized ultrafast fiber lasers with tunable filters to generate synchronized, mode-locked pulses of specific wavelengths, reducing wavelength dispersion and enhancing measurement accuracy through passive synchronization and frequency tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If solid-state lasers pumping optical parametric oscillators are used for CRS, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the essential function of generating synchronized ultrafast pulses from complex solid-state laser systems and implements it using simplified fiber-optic components. Specifically, it uses fiber amplifiers and optical parametric amplifiers in a fiber-optic configuration rather than traditional solid-state lasers, thereby reducing device complexity while maintaining measurement precision for coherent Raman spectroscopy
Solution Approach 2:
The patent replaces mechanical alignment systems inherent in solid-state lasers with fiber-optic coupling mechanisms. The fiber-optic architecture eliminates the need for complex mechanical alignment and adjustment mechanisms, substituting them with robust fiber connections that maintain stable optical paths while reducing overall system complexity
2Measurement precision
If solid-state lasers pumping optical parametric oscillators are used for CRS, then measurement precision is improved, but device portability deteriorates
Solution Approach 1:
The patent extracts the core functionality of CRS from bulky solid-state laser systems and reimplements it using compact fiber-optic components. The fiber amplifier and optical parametric amplifier modules are significantly smaller and lighter than traditional solid-state laser systems, enabling portable CRS devices while preserving measurement precision through maintained pulse synchronization and spectral coverage
Solution Approach 2:
The patent employs a nested architecture where fiber-optic components are integrated within compact housing structures. The fiber amplifiers, optical parametric amplifiers, and detection systems are nested within a unified portable platform, allowing the entire CRS system to be miniaturized while maintaining all necessary functional elements for precise measurements
3Device complexity
If fiber-format lasers are used for CRS, then device complexity is reduced, but measurement precision deteriorates due to wide wavelength dispersion
Solution Approach 1:
The patent introduces dynamic spectral filtering using tunable optical filters that can be adjusted in real-time to select specific wavelength ranges. This dynamic control allows the system to compensate for the inherently wide spectral bandwidth of fiber lasers, thereby maintaining measurement precision by isolating the desired Raman-shifted wavelengths from the broad spectral output
Solution Approach 2:
The patent implements feedback mechanisms through autocorrelation detection and spectral analysis that monitor the pulse characteristics and wavelength distribution. This feedback information is used to adjust the optical parametric amplifier pumping and tunable filter settings, creating a closed-loop control system that maintains precise wavelength selection despite the wide initial spectral dispersion of fiber-format lasers
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 fast and accurate non-invasive imaging of tissue molecular composition, providing a compact, cost-effective, and stable source for coherent Raman spectroscopy with improved measurement precision and versatility.
Implementation Method 1
synchronized, mode-locked pulses... through passive synchronization
Implementation Method 2
mode-locked light pulses from two optical cavities
Implementation Method 3
tunable filters to generate synchronized, mode-locked pulses of specific wavelengths
Implementation Method 4
followed by two fiber amplifiers
Implementation Method 5
optical parametric amplifier (OPA) pumped by a mode-locked, ultrafast fiber laser
Implementation Method 6
coherent Raman spectroscopy (CRS)... nonlinear excitation of molecules
Data Source
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AI summary
A laser device (10) for outputting filtered light pulses for inducing coherent Raman scattering in a sample (42). The laser device (10) comprises a first optical cavity 20a comprising a first gain medium (24a); and a second optical cavity (20b) comprising a second gain medium (24b) different to the first gain medium. The first gain medium (24a) and the second gain medium (24b)are each excitable by a pump light source (22a,22b) to generate light at respective different ranges of wavelengths. A synchronizer (30) is optically coupled to both the first optical cavity (20a) and the second optical cavity (20b). The synchronizer (30) is configured to synchronize and mode-lock light fromthe first optical cavity (20a) and the second optical cavity (20b). The laser device (10) also includes a first optical filter (34a) and a second optical filter (34b). The first optical filter (34a) and the second optical filter (34b)are configured to filter the light from the first optical cavity (20a) and the second opticalcavity (20b) respectively in order to output first filtered light pulses at a first predetermined range of wavelengths and second filtered light pulses at a second predetermined range of wavelengths.