Probing the mode-locking pattern in the parameter space of a Figure-9 laser

Area of Science:

• Physics
• Optics
• Laser Technology

Background:

• Optimizing Figure-9 mode-locked lasers is complex due to numerous cavity configurations.
• A generalized approach for identifying optimal operating states remains a challenge.

Purpose of the Study:

• To systematically probe and map the output pulsation states of a Figure-9 mode-locked laser.
• To identify regions of optimal mode-locked operation and understand their correlation with cavity parameters.

Main Methods:

• Meticulous scanning of the laser's parameter space to generate a map of output states.
• Correlation analysis between mode-locking regions and cavity transmission functions.
• Numerical calculations using Jones matrix to explain experimental observations.

Main Results:

• Periodic regions corresponding to mode-locked operations were identified in the output state map.
• A direct correlation was observed between the mode-locking pattern and the cavity configuration, particularly fiber loop symmetry.
• Numerical simulations successfully explained the experimental findings regarding mode-locking behavior.

Conclusions:

• The study provides a visually intuitive method for evaluating and optimizing Figure-9 lasers.
• Understanding the relationship between cavity configuration and mode-locking patterns is crucial for laser design.
• The findings facilitate the identification of optimal operating states for ultra-short pulse generation.