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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

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High performance mode locking characteristics of single section quantum dash lasers.

Ricardo Rosales¹, S G Murdoch, R T Watts

¹CNRS, Laboratory for Photonics and Nanostructures, Route de Nozay, 91460 Marcoussis, France. ricardo.rosales@lpn.cnrs.fr

|April 20, 2012

Summary

This study investigates mode locking in quantum dash lasers, focusing on spectral phase profiles. Researchers demonstrated the generation of high peak power, sub-picosecond pulses with narrow radio frequency linewidths.

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Area of Science:

Optoelectronics
Laser Physics
Materials Science

Background:

Quantum dash lasers offer wide spectral bandwidths.
Mode locking is crucial for generating ultrashort optical pulses.
Static spectral phase profile influences pulse shape and quality.

Purpose of the Study:

Investigate mode locking characteristics of single section quantum dash lasers.
Analyze the static spectral phase profile's impact on mode locked pulse shape.
Evaluate the dependence of the phase profile on cavity length and injection current.

Main Methods:

Experimental evaluation of mode locking features.
Characterization of spectral phase profiles.
Analysis of pulse parameters (e.g., duration, linewidth) under varying conditions.

Main Results:

The static spectral phase profile was found to determine the mode locked pulse shape.
Dependencies on cavity length and injection current were experimentally determined.
Efficient generation of high peak power sub-picosecond pulses was achieved.

Conclusions:

Quantum dash lasers can efficiently generate high peak power, sub-picosecond pulses.
Control over spectral phase profile enables optimization of pulse characteristics.
These lasers are promising for applications requiring ultrashort pulses with low radio frequency linewidths.