研究目的
To demonstrate for the first time mode-locking with an acousto-optic modulator for a repetitively pulsed slab RF discharge CO2 laser and to study its effects on the laser pulses envelope compared to free-running mode.
研究成果
Active mode-locking was successfully implemented for a repetitively pulsed slab RF discharge CO2 laser, emitting trains of 5.5 ns pulses at 27.25 MHz repetition rate. The study indicated the possibility to develop a very compact, mode-locked sub-nanosecond CO2 laser by enhancing active medium pressure and decreasing discharge gap.
研究不足
The laser system was not compact due to the long cavity of 5.5 m length, and the CO2 laser power was relatively low due to increased diffraction losses related to the non-optimal cavity design.
1：Experimental Design and Method Selection:
The study implemented and studied mode-locking with an acousto-optic modulator (AOM) for a slab RF discharge CO2 laser.
2：Sample Selection and Data Sources:
The electrode system consisted of two hollow electrodes with an RF discharge gap of 5 mm, filled with a nitrogen-free gas mixture.
3：List of Experimental Equipment and Materials:
The setup included a slab RF discharge facility, AOM made of germanium, photo-detector with temporal resolution of ~
4：5 ns, and power meter. Experimental Procedures and Operational Workflow:
The laser operated in two modes: free-running and mode-locking, with measurements taken of lasing temporal behavior and output power.
5：Data Analysis Methods:
Fourier analysis was used to determine the pulse spectrum and spike duration.
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