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

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Published on: February 28, 2016

High power coherent polarization locked laser diode.

Purnawirman¹, P B Phua

¹Temasek Laboratories, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553, Singapore.

|May 13, 2011

Summary

Researchers achieved high-power, single-lobed output from a broad area laser diode array using coherent polarization locking. This method enhances diode laser brightness by over tenfold, enabling new applications.

Area of Science:

Optics and Photonics
Semiconductor Lasers

Background:

Broad area diode lasers offer high power but suffer from poor beam quality.
Coherent combining of laser diodes is crucial for achieving high brightness.
Previous work focused on Gaussian beams, limiting applications for multimode broad area diodes.

Purpose of the Study:

To demonstrate coherent polarization locking for multimode broad area diode lasers.
To achieve high-power, single-lobed output from a diode laser array.
To improve the brightness of broad area diode lasers.

Main Methods:

Spatially combined four diode emitters using walk-off crystals and waveplates.
Passively locked diode phases via polarization discrimination.
Employed a resonator with retro-reflection feedback to mitigate smile effect.

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Main Results:

Produced 7.2 W of coherent output power at 980 nm.
Achieved a single-lobed, coherent beam with an M2 value of 1.5x11.5.
Improved diode laser brightness by over an order of magnitude.

Conclusions:

Coherent polarization locking is feasible for multimode broad area diode lasers.
The developed technique significantly enhances diode laser brightness and beam quality.
This advancement opens possibilities for high-power laser applications.