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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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A random Q-switched fiber laser.

Yulong Tang¹, Jianqiu Xu¹

¹Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics and Astronomy, IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China.

Scientific Reports

|March 24, 2015

Summary

This summary is machine-generated.

Researchers achieved high-brightness random Q-switched laser pulses by utilizing Rayleigh scattering in fiber cores. This breakthrough overcomes previous limitations in random lasers, enabling high peak power output.

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Area of Science:

Photonics and Optics
Laser Physics
Materials Science

Background:

Random lasers utilize multiple-scattering feedback for coherent emission.
Conventional lasers use Q-switching and mode-locking for high peak power.
Random cavities in traditional random lasers hinder energy storage, preventing Q-switching.

Purpose of the Study:

To demonstrate Q-switching in random lasers for high peak power output.
To investigate the use of Rayleigh scattering for random cavity formation.
To achieve high-brightness random Q-switched laser emission.

Main Methods:

Utilized widespread Rayleigh scattering from fiber core refractive-index irregularities to create random cavities.
Employed stimulated Brillouin scattering to rapidly enhance cavity Q-factor.
Leveraged enhanced spontaneous emission from random cavity resonances.

Main Results:

Successfully generated random Q-switched pulses with high brightness and peak power.
Demonstrated the first observation of high-brightness random Q-switched laser emission.
Overcame the energy storage limitations of conventional random lasers.

Conclusions:

This study presents a novel method for achieving Q-switching in random lasers.
The findings open new avenues for applications in encryption, 3D imaging, and astrophysics.
The developed technique is expected to significantly advance random laser technology.