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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

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Light-mode condensation in actively-mode-locked lasers.

Rafi Weill¹, Baruch Fischer, Omri Gat

¹Department of Electrical Engineering, Technion-IIT, Haifa 32000, Israel.

Physical Review Letters

|May 21, 2010

Summary

Actively mode-locked lasers can form light pulses resembling Bose-Einstein condensation (BEC). This transition occurs under specific conditions, particularly with a time-dependent modulation power law.

Area of Science:

* Optics and Photonics
* Quantum and Statistical Physics

Background:

* Mode-locked lasers generate ultrashort optical pulses.
* Bose-Einstein condensation (BEC) is a quantum state of matter.

Purpose of the Study:

* To investigate the formation of light pulses in actively mode-locked lasers.
* To explore the analogy between laser mode dynamics and Bose-Einstein condensation.

Main Methods:

* Statistical light-mode dynamics framework.
* Mapping laser eigenmode distribution to noninteracting bosons in a potential.
* Analyzing mode-locking modulation with power law time dependence.

Main Results:

* Demonstrated a transition to a light pulse state analogous to Bose-Einstein condensation (BEC).

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* Identified specific conditions for this light-mode BEC transition.

* Found the transition is linked to a time-dependent modulation exponent less than 2.

Conclusions:

* Laser mode dynamics can exhibit phenomena similar to quantum statistical physics.
* The light-mode BEC transition offers new insights into laser physics.
* This finding may open avenues for novel laser applications.