Supercontinuum Source for Multiphoton Excitation Microscopy
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Solution Overview
Problem
The practical application of supercontinuums in optical communication and other fields has been limited due to the development of other techniques, such as multi-core structured optical fibers, and they have not shown significant progress in achieving higher transmission capacity through multicarrier transmission.
Innovation Solution
A supercontinuum source is developed that generates and emits a supercontinuum with a spectrum continuous in a wavelength band width of at least 200 nm within the range of 850 to 1550 nm, using a pulse oscillator and a waveguide with nonlinear optical effects, and optionally includes a pulse compressor to increase peak power, enabling multiphoton excitation of objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple ultrashort pulse laser oscillators are used to achieve multiphoton excitation across different wavelengths, then the excitation coverage and versatility are improved, but the device complexity and cost increase
Solution Approach 1:
The patent combines multiple laser wavelengths into a single supercontinuum source by passing ultrashort pulses through a nonlinear optical waveguide, generating a broad spectrum (400-2000 nm) that replaces multiple individual laser oscillators for multiphoton excitation
Solution Approach 2:
The supercontinuum source serves multiple functions simultaneously: it provides broadband excitation for various fluorophores, enables multiphoton excitation at different wavelengths, and eliminates the need for multiple specialized laser systems, making it a universal light source for fluorescence microscopy
2Adaptability or versatility
If the spectral bandwidth of the supercontinuum is broadened to cover more wavelengths, then the multiphoton excitation capability is improved, but the wavelength flatness and intensity distribution deteriorate
Solution Approach 1:
The patent applies local quality by using different waveguide sections with optimized dispersion characteristics: the first section (850-1550 nm) uses normal dispersion to flatten the spectrum, while the second section extends to shorter wavelengths with controlled dispersion to maintain both bandwidth and flatness across different spectral regions
3Power
If the peak power of the supercontinuum is increased to improve multiphoton excitation efficiency, then the excitation intensity is improved, but the risk of sample damage and nonlinear optical noise increases
Solution Approach 1:
The patent uses ultrashort pulsed operation (repetition rate 80-200 MHz, pulse width 100-500 fs) to deliver high peak power only during brief pulses, maintaining low average power to prevent sample heating and damage while achieving sufficient multiphoton excitation during each pulse
Solution Approach 2:
The patent employs a waveguide structure that maintains continuous supercontinuum generation over extended propagation distances, ensuring consistent peak power and spectral quality throughout the output beam for reliable multiphoton excitation
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 supercontinuum source enables effective multiphoton excitation for fluorescence observation and measurement, providing wavelength flatness and high peak power, making it suitable for various applications including biological sample observation without the need for multiple ultrashort pulse laser oscillators.
Implementation Method 1
it is spectrally broadened by nonlinear optical effects such as self-phase modulation
Implementation Method 2
mutual phase modulation
Implementation Method 3
four-wave mixing
Implementation Method 4
Raman scattering
Implementation Method 5
a pulse compressor to increase the peak power of the supercontinuum by compressing the supercontinuum emitted from the waveguide
Implementation Method 6
emits the supercontinuum enabling multiphoton excitation of an irradiated object on an irradiated plane
Implementation Method 7
multiphoton excitation fluorescence microscope
Data Source
AI summary
An ultrashort light pulse oscillated from an ultrashort pulse oscillator enters a waveguide (2) via a polarization control element (3). After conversion into a supercontinuum by a nonlinear optical effect, it is compressed by a prism pair compressor (71) as pulse compressor (7), and then emitted. The waveguide (2), which is a nonlinear fiber with normal dispersion in the wavelength range from 850 to 1550, generates the supercontinuum having a spectrum continuous in a wavelength band width of at least 200 nm included in the wavelength range from 850 to 1550 nm. The supercontinuum, which has a peak power within 1 to 100 kW, can be used as excitation light in a multiphoton excitation fluorescence microscope for fluorescence observation of biological samples.