Laser Source Apparatus With Multiple Plate Continuum
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Solution Overview
Problem
Conventional ultrafast spectroscopy laser source apparatuses face limitations in achieving high repetition rates, broadband gain, and stable signal-to-noise ratios due to reliance on solid-state lasers and double frequency modules, leading to long measurement times and sensitivity to optical path and beam pointing, which complicates wavelength switching and increases noise.
Innovation Solution
A laser source apparatus featuring a laser generator with a multiple plate continuum for spectrum broadening, capable of generating short pulses with high repetition rates and broad bandwidth, reducing configuration complexity and maintaining stability, while preventing self-focusing damage through a series of thin plates configured at Brewster's angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If solid-state lasers and double frequency modules are used to pump broadband gain medium, then specific absorption band emission is achieved, but average power is limited to about ten watts and pulse repetition rate is limited to several kHz
Solution Approach 1:
The patent replaces the conventional solid-state laser and double frequency module system with a direct diode laser pumping system. This substitution eliminates the need for complex frequency conversion mechanisms and enables direct pumping of the broadband gain medium at its absorption band, thereby achieving higher average power (multi-watt to kilowatt level) and higher pulse repetition rates (MHz level) simultaneously.
Solution Approach 2:
The patent changes the pumping parameters by using diode laser emission characteristics that directly match the broadband gain medium absorption spectrum. This parameter matching enables efficient energy transfer and allows the system to operate at higher powers and repetition rates without the limitations imposed by conventional solid-state laser systems.
2Adaptability or versatility
If optical parametric amplifier is used for wavelength conversion, then tunable center wavelength is achieved, but supported bandwidth is limited to about tens of nm and system is sensitive to optical path and beam pointing
Solution Approach 1:
The patent extracts and eliminates the optical parametric amplifier component from the system. Instead of using OPA for wavelength conversion, the system directly generates broadband radiation from the pumped broadband gain medium, thereby removing the bandwidth limitation (tens of nm) and the sensitivity to optical path and beam pointing adjustments.
Solution Approach 2:
The broadband gain medium serves multiple functions simultaneously: it provides broadband absorption of diode laser light, generates broadband emission across a wide spectral range (hundreds of nm), and operates at high repetition rates. This multi-functionality replaces the need for separate wavelength conversion devices and their associated complexity.
3Illumination intensity
If ultrashort pulse is focused onto bulk crystal to generate supercontinuum, then broadband probe beam is produced, but beam self-focusing increases power density and damages the bulk crystal
Solution Approach 1:
The patent replaces the expensive and fragile bulk crystal with a more robust medium that can withstand high power densities without damage. The new medium generates the supercontinuum spectrum through a process that does not rely on focusing ultrashort pulses into a bulk crystal, thereby eliminating the self-focusing damage mechanism while maintaining broadband spectral output.
Solution Approach 2:
The patent segments the spectrum generation process into direct broadband emission from the gain medium followed by spectral broadening through a controlled process that avoids the harmful self-focusing effects. This segmentation allows the system to achieve high spectral energy density without concentrating all energy into a single bulk crystal where damage would occur.
4Measurement precision
If conventional laser source apparatus is used, then pump and probe beams are generated, but measurement time is lengthened due to low repetition rate and signal-to-noise ratio is restricted
Solution Approach 1:
The patent implements continuous high-repetition-rate pulsing (MHz level) that maintains a steady stream of photons for measurement. This continuous action at high repetition rates accumulates signal rapidly, improving the signal-to-noise ratio through statistical averaging while minimizing measurement time, unlike conventional systems that operate at kHz repetition rates with longer gaps between pulses.
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 enables high signal-to-noise ratios, short measurement times, and easy wavelength tuning, reducing maintenance needs and noise, while providing a simple and efficient ultrafast spectroscopy platform with improved spectral energy density and coherence.
Implementation Method 1
The spectrum broadening unit includes a multiple plate continuum. The multiple plate continuum includes a plurality of thin plates, and the thin plates are configured along the beam path in order
Implementation Method 2
The beam splitter is configured in the following stage of the laser generator to divide the original laser beam into the first laser beam and the second laser beam
Implementation Method 3
preventing self-focusing damage through a series of thin plates configured at Brewster's angles
Implementation Method 4
The laser generator is configured to generate an original laser beam with a pulse duration smaller than 1 ps
Data Source
AI summary
A laser source apparatus is for providing a beam path to generate a first laser beam and a second laser beam. The laser source apparatus includes a laser generator, at least one spectrum broadening unit and a beam splitter on the beam path. The laser generator is configured to generate an original laser beam with a pulse duration smaller than 1 ps. The spectrum broadening unit is configured in a following stage of the laser generator. The spectrum broadening unit includes a multiple plate continuum. The multiple plate continuum includes a plurality of thin plates, and the thin plates are configured along the beam path in order. The beam splitter is configured in the following stage of the laser generator to divide the original laser beam into the first laser beam and the second laser beam.