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Ultrafast Raman laser mode-locked by nanotubes.

C E S Castellani¹, E J R Kelleher, J C Travers

¹Department of Physics, Blackett Laboratory, Imperial College London, London, UK. c.schmidt‐castellani09@imperial.ac.uk

|October 18, 2011

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We achieved passive mode-locking in a Raman fiber laser using a nanotube saturable absorber. This method generates and compresses ultrashort pulses, creating a versatile laser source for diverse applications.

Area of Science:

Optics and Photonics
Materials Science

Background:

Passive mode-locking is crucial for generating ultrashort laser pulses.
Nanotube-based saturable absorbers offer unique nonlinear optical properties.
Net normal dispersion cavities are explored for pulse generation and control.

Purpose of the Study:

To demonstrate passive mode-locking of a Raman fiber laser.
To utilize a nanotube saturable absorber for pulse generation.
To achieve high peak power and wavelength versatility in the laser output.

Main Methods:

Employing a nanotube-based saturable absorber.
Configuring a net normal dispersion fiber laser cavity.
Implementing pulse compression techniques.

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Last Updated: May 28, 2026

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Main Results:

Successfully achieved passive mode-locking.
Generated highly chirped 500 ps pulses.
Compressed pulses to 2 ps with 1.4 kW peak power.

Conclusions:

The developed Raman fiber laser is a simple and wavelength-versatile source.
Nanotube saturable absorbers are effective for passive mode-locking.
This approach enables practical applications requiring high peak power ultrashort pulses.