1  MW peak-power subpicosecond optical pulse source based on a gain-switched laser diode

Area of Science:

• Optics and Photonics
• Laser Physics

Background:

• High-peak-power, ultrashort optical pulses are crucial for various scientific applications.
• Existing methods often face challenges with amplified spontaneous emission noise and pulse duration control.

Purpose of the Study:

• To develop a method for generating subpicosecond optical pulses with megawatt peak power.
• To effectively reduce amplified spontaneous emission noise during amplification.

Main Methods:

• Utilizing a 1060 nm band gain-switched laser diode pulse oscillator.
• Employing a three-stage ytterbium-doped fiber amplifier system.
• Implementing self-phase modulation for noise and duration reduction, followed by grating-pair temporal compression.

Main Results:

• Generated optical pulses with 1.2 MW peak power and 0.6 ps duration from the oscillator.
• Achieved significant reduction in amplified spontaneous emission noise.
• Successfully generated subpicosecond optical pulses exceeding 1 MW peak power after amplification and compression.

Conclusions:

• The developed technique effectively generates high-peak-power, subpicosecond optical pulses.
• Self-phase modulation is a key mechanism for improving pulse quality in fiber amplifiers.
• This method offers a promising approach for advanced laser applications requiring ultrashort, high-intensity pulses.