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

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Tilt-tuned etalon locking for tunable laser stabilization.

Bradley M Gibson, Benjamin J McCall

|June 16, 2015

Summary

This summary is machine-generated.

Locking a tunable laser to an etalon fringe offers a simple, inexpensive stabilization method. This technique successfully stabilized an external-cavity quantum cascade laser, achieving excellent frequency stability.

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Area of Science:

Laser physics
Optical engineering

Background:

Tunable lasers require precise frequency stabilization for various applications.
External-cavity quantum cascade lasers (ECQC Ls) offer broad tunability but can suffer from frequency drift.

Purpose of the Study:

To present a simple and inexpensive method for stabilizing tunable lasers.
To demonstrate the effectiveness of this method on an external-cavity quantum cascade laser.

Main Methods:

Utilizing a tilt-tuned etalon to provide a frequency reference.
Implementing a feedback loop to lock the laser to the etalon fringe.
Characterizing the stabilized laser's performance using Allan deviation and tuning range measurements.

Main Results:

Achieved laser stabilization with an Allan deviation of approximately 1 MHz over a one-second integration period.
Demonstrated a single-scan tuning range of approximately 0.4 cm⁻¹ for the locked laser.
The system exhibited robustness with minimal alignment needs and automated lock acquisition.

Conclusions:

Locking to an etalon fringe is a viable and cost-effective approach for stabilizing tunable lasers.
The described system provides significant frequency stability for external-cavity quantum cascade lasers.
The method is adaptable for different wavelengths and enhanced stability requirements.