Multiple Q-switching Laser Pulse Oscillation Method
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Solution Overview
Problem
Q-switching lasers have high peak power, which limits their clinical use in skin treatment due to unnecessary consumption of light and electrical energy after the initial pulse is generated.
Innovation Solution
A multiple laser pulse oscillation method using multiple Q-switching, where additional Q-switching events are performed at specific delays during the light energy period to generate multiple laser pulses, reducing peak power and increasing energy efficiency by utilizing excited electrons throughout the energy period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a Q-switching laser is used to generate short pulse width laser with high peak power, then the laser can achieve high pulse power (100 MW), but it causes unnecessary consumption of light energy and electrical energy after the laser oscillation starts
Solution Approach 1:
The single Q-switching event is segmented into multiple Q-switching events occurring at different time delays (first Q-switching at 150μs, second Q-switching at 200μs, third Q-switching at 250μs). This segmentation allows the excited electrons to be utilized in multiple stages rather than being wasted after a single pulse, thereby reducing energy loss while maintaining high peak power output.
Solution Approach 2:
Multiple Q-switching events are performed periodically at specific time intervals during the light energy period. The periodic Q-switching signals are injected at predetermined delays (150μs, 200μs, 250μs) to continuously extract laser energy from the excited electrons, converting what would be wasted energy into useful laser output across multiple pulses.
2Duration of action of moving object
If a single Q-switching signal is injected after 150μs delay, then a short pulse width laser is generated, but the excited electrons continue to consume light energy without contributing to laser oscillation
Solution Approach 1:
The single laser pulse generation is segmented into multiple pulse generations through sequential Q-switching events. The first Q-switching generates a pulse at 150μs delay, the second at 200μs delay, and the third at 250μs delay. This segmentation extends the utilization period of excited electrons, improving energy efficiency while maintaining the short pulse width characteristic of Q-switching lasers.
Solution Approach 2:
Instead of a single discrete laser pulse, the continuous injection of Q-switching signals at multiple time points creates a continuous useful action. The excited electrons continuously contribute to laser oscillation through multiple Q-switching events, eliminating the period where energy is consumed without producing useful laser output.
3Quantity of substance
If light energy is continuously injected from the flash lamp after Q-switching, then electrons are continuously excited in the laser medium, but the excited electrons do not contribute to laser oscillation
Solution Approach 1:
Multiple Q-switching signals are injected periodically at specific delays (150μs, 200μs, 250μs) during the continuous light energy injection period. This periodic action ensures that excited electrons are continuously harvested for laser oscillation throughout the energy injection period, converting what would be wasted electrical energy into useful laser output.
Solution Approach 2:
The system maintains continuous useful action by injecting multiple Q-switching signals throughout the light energy period. Each Q-switching event extracts energy from the continuously excited electrons, ensuring that the electrical energy consumed by the flash lamp is continuously converted into useful laser energy rather than being wasted.
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 method reduces laser peak power and increases overall output energy, allowing for more efficient and expanded clinical applications by effectively using the energy of excited electrons for continuous laser oscillation.
Implementation Method 1
a flash lamp is discharged and the light energy generated from the flash lamp is injected into a laser medium, and in the laser medium, density inversion occurs to make electrons in an excited state
Implementation Method 2
A Q-switch signal is injected with a delay of about 150 μs after first pumping starts, and a laser with a short pulse width and a high peak power is oscillated
Implementation Method 3
the basic principle of such lasers is that targets such as water, melanin, oxyhemoglobin, and the like have their own frequencies and a reaction occurs on a specific target when a laser having a similar frequency to the frequency of the specific target is irradiated thereto
Data Source
AI summary
Provided is a multiple laser pulse oscillation method using multiple Q-switching capable of reducing peak power of laser and increasing energy efficiency. A multiple laser pulse oscillation method using multiple Q-switching includes: forming one period of light energy; exciting electrons of a gain medium by the light energy; performing first Q-switching during one period of the light energy; oscillating a first laser pulse by the first Q-switching; performing second Q-switching during one period of the light energy; and oscillating a second laser pulse by the second Q-switching.