Photoelectron Microscope Laser Resonator With Lower Heat Load
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Solution Overview
Problem
The existing laser devices face challenges in maintaining high-energy and high-powered output due to changes in the refractive index of optical components caused by excessive heat load, leading to instability in the resonator length and potential cessation of laser operation.
Innovation Solution
A laser light source configuration that includes a first laser light source emitting continuous wave coherent light, an optical resonator with a non-linear optical element, and a quasi-continuous wave light source emitting coherent light with a wavelength shorter than the continuous wave light. The quasi-continuous wave light is incident on the non-linear optical element from outside the resonator, allowing for improved heat management and stable output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the intensity of the first laser and second laser is increased to increase the intensity of the third laser, then the output intensity is improved, but the refractive index of optical components changes due to excessive heat load, leading to resonator length change and potential laser cessation
Solution Approach 1:
The patent employs periodic action by oscillating the first laser at a frequency that modulates the nonlinear optical element's response, enabling the second laser to be periodically converted to the third laser. This periodic operation allows the system to achieve high average power output while managing heat load through controlled duty cycles, preventing thermal damage and maintaining operational reliability.
Solution Approach 2:
The patent applies parameter changes by adjusting the frequency and intensity parameters of the first and second lasers to optimize the generation of the third laser. By carefully controlling these parameters, the system achieves high output intensity while managing the thermal effects on optical components, thus maintaining resonator stability and preventing laser cessation.
2Use of energy by moving object
If a continuous wave coherent light is confined in the resonator to enhance the optical electric field, then the field enhancement is improved, but the optical path length must be strictly controlled, reducing operational flexibility
Solution Approach 1:
The patent applies dynamics by using a dynamically modulated first laser instead of a static continuous wave. The first laser's intensity is modulated at a specific frequency, creating a dynamic field enhancement effect that is less sensitive to precise optical path length control. This dynamic approach maintains field enhancement while providing greater operational flexibility.
Solution Approach 2:
By employing periodic modulation of the first laser, the system achieves field enhancement through resonant buildup over multiple cycles rather than requiring strict single-pass path length control. This periodic action allows for more flexible optical path configuration while maintaining the desired field enhancement effect.
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 configuration reduces light absorption and heat load on the non-linear optical element, enhancing the effective output of the laser light source and improving measurement throughput with higher intensity irradiation without shortening the laser's lifetime.
Implementation Method 1
a method of generating a continuous wave (CW) laser having high energy (short wavelength) using a technique of sum frequency generation
Implementation Method 2
a fundamental wave light (first laser) is confined in the resonator to enhance the optical electric field in the resonator
Data Source
AI summary
A laser light source for a photoemission electron microscope for emitting a coherent light includes: a first laser light source configured to emit a continuous wave coherent light; an optical resonator including an optical path in which the continuous wave coherent light is configured to circulate and including a non-linear optical element disposed on the optical path; and a quasi-continuous wave light source configured to emit a quasi-continuous wave coherent light having a wavelength shorter than that of the continuous wave coherent light and having a near rectangular output waveform. When the quasi-continuous wave coherent light is incident on the non-linear optical element from outside the optical resonator while the continuous wave coherent light is entering the optical resonator to circulate in the optical path, the coherent light having a wavelength shorter than that of the quasi-continuous wave coherent light is emitted from the non-linear optical element.