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

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Measuring the nonlinear phase shift in a mode-locked laser.

Carlos Andres Perilla Rozo, Jérôme Genest, Jean-Daniel Deschênes

|May 16, 2019

Summary

This summary is machine-generated.

Researchers measured the nonlinear phase shift of a mode-locked laser (MLL) by down-mixing its spectrum to electrical frequencies. This technique allows for real-time MLL characterization during operation.

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Area of Science:

Optics
Laser Physics
Nonlinear Optics

Background:

Mode-locked lasers (MLLs) are crucial for various applications requiring ultrashort pulses.
Characterizing MLLs in real-time is essential for maintaining performance and stability.
Nonlinear phase shifts impact MLL performance and pulse characteristics.

Purpose of the Study:

To develop a method for measuring the nonlinear phase shift of a mode-locked laser during operation.
To enable real-time characterization of MLLs.
To provide insights into MLL dynamics and nonlinear effects.

Main Methods:

Down-mixing the optical spectrum of an MLL to electrical frequencies using a tunable continuous-wave laser.
Characterizing sub-threshold low-intensity emission.
Analyzing laser mode positions relative to the down-mixed signal.

Main Results:

Successfully measured the nonlinear phase shift of an MLL.
Demonstrated a technique for in-situ MLL characterization.
Established a correlation between emission characteristics and nonlinear phase shifts.

Conclusions:

The developed method allows for non-invasive, real-time measurement of MLL nonlinear phase shifts.
This technique enhances the understanding and control of MLLs.
Potential applications in laser diagnostics and feedback systems.