Self-gain-modulation random distributed feedback Raman fiber laser with switchable repetition rate

Area of Science:

• Photonics and Laser Technology
• Nonlinear Optics
• Fiber Optic Systems

Background:

• Random fiber lasers offer unique spectral properties.
• Achieving stable pulsed operation in such lasers is challenging.
• Self-gain-switching is a potential mechanism for pulsed laser dynamics.

Purpose of the Study:

• To experimentally demonstrate pulsed operation in a random fiber laser via self-gain-switching.
• To characterize the properties of the generated pulses, including timing jitter and output power.
• To investigate the dependence of the laser's repetition rate on pump power and develop a predictive model.

Main Methods:

• Experimental setup of a random fiber laser.
• Utilizing self-gain-switching for pulsed operation.
• Varying pump power to observe changes in repetition rate and pulse characteristics.

Main Results:

• Successful demonstration of pulsed operation in a random fiber laser.
• Generated pulses exhibit low timing jitter and high average output power.
• Abrupt switching of the repetition rate was observed with changes in pump power.
• A simple formula for predicting oscillation frequencies was introduced.

Conclusions:

• Self-gain-switching is an effective method for achieving pulsed operation in random fiber lasers.
• The demonstrated technique offers a promising route to high-performance pulsed fiber lasers.
• The findings provide a foundational understanding and predictive capability for random fiber laser dynamics.