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Sparks as sub-nanosecond, broadband light switches
Optics Letters
|July 2, 2019
Summary
Spark micro-discharges show potential as fast laser switches operating on sub-nanosecond timescales. These high-power laser switches achieve opacity transitions faster than 100 picoseconds, demonstrating their rapid response capabilities.
Area of Science:
- Optoelectronics
- Plasma Physics
- Laser Technology
Background:
- Laser switches are crucial for controlling high-power laser systems.
- Existing technologies face limitations in switching speed and power handling.
- Sub-nanosecond timescale operation is desirable for advanced laser applications.
Purpose of the Study:
- To investigate spark micro-discharges as a novel working element for laser switches.
- To evaluate their performance on sub-nanosecond timescales.
- To assess their potential for broad wavelength operation and high laser power handling.
Main Methods:
- Generated spark micro-discharges in argon and xenon gases at varying pressures.
- Focused a continuous 405 nm wavelength laser through the spark gap.
- Recorded laser transmission using a high-speed photodiode with a 400 ps fall time.
Main Results:
- Demonstrated sub-nanosecond switching capability by achieving opacity transitions faster than the detection limit.
- Observed opacity transition times of 100 picoseconds or shorter at higher gas pressures.
- Identified key challenges impacting device reliability for practical implementation.
Conclusions:
- Spark micro-discharges are a viable candidate for ultrafast laser switching applications.
- The demonstrated speed surpasses current limitations, opening avenues for new laser system designs.
- Further research is needed to enhance device reliability and optimize performance.
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