Passive Q-switch Laser Cross Section Matching
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Solution Overview
Problem
Conventional passive Q-switch-type solid laser apparatuses face challenges in achieving high peak power while maintaining highly repetitive frequency and short pulse-time width, making them less applicable for spectroscopic measurements and material processing.
Innovation Solution
A passive Q-switch-type solid laser apparatus with a solid gain medium, a saturable absorber, and a cross section control means that adjusts the stimulated emission cross section of the gain medium to match the absorption cross section of the saturable absorber, utilizing temperature control and oscillatory-wavelength control to enhance peak power and reduce pulse-time width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the oscillator length is made shorter to enhance peak power, then the pulse-time width is reduced and peak power is enhanced, but the repetitive frequency cannot be increased beyond kHz level
Solution Approach 1:
The patent applies parameter changes by optimizing the relationship between the stimulated emission cross section of the gain medium and the absorption cross section of the saturable absorber. By carefully selecting and matching these cross section parameters, the laser achieves both high peak power and high repetitive frequency beyond kHz level, resolving the contradiction between power enhancement and productivity maintenance
2Quantity of substance
If the stimulated emission cross section is made larger to enhance gain, then the pulse energy is increased, but the absorption by saturable absorber becomes less efficient
Solution Approach 1:
The patent optimizes the ratio between stimulated emission cross section and absorption cross section. By adjusting these parameters to achieve optimal matching, the system maintains high pulse energy while ensuring efficient Q-switching operation through the saturable absorber, preventing degradation of switching efficiency
Solution Approach 2:
The patent implements a feedback mechanism where the saturable absorber's absorption characteristics provide automatic regulation. The absorber's transmission changes in response to intracavity intensity, creating a self-regulating system that maintains stable operation and efficient Q-switching even with varying gain conditions
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 apparatus generates high peak-power pulse lasers with large pulse energy and short pulse-time width at high repetitive frequencies, overcoming the limitations of conventional systems by efficiently breaching the saturable absorber with stimulated emission light.
Implementation Method 1
a solid gain medium for generating stimulated emission light
Implementation Method 2
a saturable absorber for absorbing the stimulated emission light
Implementation Method 3
cross section control means for making at least one of a stimulated emission cross section of the solid gain medium and an absorption cross section of the saturable absorber closer to another one of them
Data Source
AI summary
To provide a passive Q-switch-type solid laser apparatus for outputting a high peak-power pulse laser whose pulse energy is large and pulse-time width is small. A passive Q-switch-type solid laser apparatus has: two reflection elements for forming an oscillator; a solid gain medium being disposed between the two reflection elements; a saturable absorber being disposed between the two reflection elements; an excitation device for exciting the solid gain medium; and a cross section control device for making at least one of a stimulated emission cross section of the solid gain medium and an absorption cross section of the saturable absorber closer to another one of them; and the cross section control device is equipped with at least one or both of a temperature control device for retaining the solid gain medium at a predetermined temperature and an oscillatory-wavelength control device for fixating an oscillatory wavelength at a predetermined wavelength.