Coherent Dual Scanning Laser Systems for High-Speed Spectroscopy
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Solution Overview
Problem
Dual scanning laser systems for spectroscopy and imaging face limitations due to low repetition rates leading to long data acquisition times, cumbersome near IR to mid-IR spectral range techniques, and limited spectral coverage, with bulky solid-state lasers being unsuitable for instrumentation applications.
Innovation Solution
The implementation of coherent dual scanning laser systems (CDSLs) using modelocked fiber lasers with high repetition rates, low noise, and phase-controlled nonlinear spectral broadening elements, along with difference frequency generation, to achieve broad spectral coverage and compact designs suitable for spectroscopy, microscopy, and THz imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If low repetition rate laser sources are used in dual scanning laser systems, then spectral measurements can be performed, but data acquisition times become excessively long
Solution Approach 1:
The patent changes the repetition rate parameter from low to high (e.g., 80 MHz to 2 GHz range), which directly reduces the time between pulses and enables faster data acquisition while maintaining spectral measurement capability through the frequency comb structure
Solution Approach 2:
The patent utilizes periodic pulsed laser action with high repetition rates to systematically scan through spectral ranges, enabling rapid Fourier transform spectroscopy by capturing interferograms at accelerated rates while maintaining the periodic coherence necessary for spectral analysis
2Power
If bulky solid-state lasers are used, then laser output can be generated, but the systems are not suitable for instrumentation applications due to large component count
Solution Approach 1:
The patent replaces bulky solid-state laser mechanisms with integrated photonic crystal fiber-based laser systems, substituting mechanical/optical bench components with compact fiber-optic structures that generate laser output while dramatically reducing component count and system size
Solution Approach 2:
The patent implements nested integration where laser generation, spectral broadening, and detection components are nested within a compact fiber-optic platform, with photonic crystal fibers nested within housing structures that provide both mechanical support and optical functionality
3Measurement precision
If conventional Fourier transform spectrometers are used, then spectral analysis can be performed, but the techniques for near IR to mid-IR spectral range are cumbersome
Solution Approach 1:
The patent creates a universal platform using frequency comb lasers that can simultaneously perform spectroscopy, imaging, and ranging functions across multiple spectral ranges (visible to mid-IR), eliminating the need for separate conventional spectrometer systems for different applications and wavelength ranges
Solution Approach 2:
The patent introduces frequency comb lasers as an intermediary that bridges the gap between conventional FTIR and modern spectroscopic techniques, providing a coherent light source that enables simplified interferometry and rapid spectral acquisition without the operational complexity of traditional near-IR to mid-IR spectrometers
4Adaptability or versatility
If limited spectral coverage systems are used, then specific measurements can be made, but broad spectral coverage from visible to mid-infrared cannot be achieved
Solution Approach 1:
The patent extends spectral coverage by utilizing the temporal dimension of ultrashort pulses to generate broad frequency spectra through nonlinear optical processes in photonic crystal fibers, transforming a single-wavelength laser into a broadband frequency comb that spans from visible to mid-infrared while maintaining coherent spectral resolution
Solution Approach 2:
The patent employs composite photonic crystal fiber structures with tailored nonlinear optical properties that enable simultaneous generation of frequency combs across broad spectral ranges, combining different fiber materials and geometries to achieve both extensive spectral coverage and high measurement precision
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 approach enables efficient, high-speed spectroscopic measurements with improved spectral resolution and reduced component count, providing broad spectral coverage from the visible to mid-infrared regions and simplifying Fourier Transform Spectroscopy while minimizing noise and acoustic interference.
Implementation Method 1
two passively modelocked fiber oscillators generating frequency combs
Implementation Method 2
phase-controlled nonlinear spectral broadening elements
Implementation Method 3
difference frequency generation, to achieve broad spectral coverage
Data Source
AI summary
The invention relates to scanning pulsed laser systems for optical imaging. Coherent dual scanning laser systems (CDSL) are disclosed and some applications thereof. Various alternatives for implementation are illustrated, including highly integrated configurations. In at least one embodiment a coherent dual scanning laser system (CDSL) includes two passively modelocked fiber oscillators. The oscillators are configured to operate at slightly different repetition rates, such that a difference δfr in repetition rates is small compared to the values fr1 and fr2 of the repetition rates of the oscillators. The CDSL system also includes a non-linear frequency conversion section optically connected to each oscillator. The section includes a non-linear optical element generating a frequency converted spectral output having a spectral bandwidth and a frequency comb comprising harmonics of the oscillator repetition rates. A CDSL may be arranged in an imaging system for one or more of optical imaging, microscopy, micro-spectroscopy and/or THz imaging.