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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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Mode-locked picosecond pulse generation from an octave-spanning supercontinuum.

D Kielpinski¹, M G Pullen, J Canning

¹Centre for Quantum Dynamics, Griffith University, Nathan QLD 4111, Australia. d.kielpinski@griffith.edu.au

|December 10, 2009

Summary

Researchers created stable, high-coherence picosecond laser pulses near 1110 nm using fiber-based supercontinuum slicing. This versatile technique enables tunable ultrashort pulse generation across a wide wavelength range.

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Area of Science:

Optics and Photonics
Laser Physics
Fiber Optics

Background:

Supercontinuum generation is a key process for broadband light sources.
Mode-locked fiber lasers are essential for generating ultrashort pulses.
Spectral slicing offers a method for selecting specific wavelengths from broadband sources.

Purpose of the Study:

To generate mode-locked picosecond pulses near 1110 nm.
To demonstrate a fiber-based system for ultrashort pulse synthesis.
To explore the potential of supercontinuum slicing for tunable wavelength generation.

Main Methods:

Generating an octave-spanning supercontinuum in a fiber optic system.
Spectrally slicing the supercontinuum around 1110 nm.
Re-amplifying the sliced spectrum to produce picosecond pulses.
Characterizing pulse duration, bandwidth, and interpulse coherence.

Main Results:

Successfully generated mode-locked picosecond pulses with a central wavelength of 1110 nm.
Pulses exhibited a duration of 1.7 picoseconds over a 1.2 nm bandwidth.
Achieved near transform-limited pulses with high interpulse coherence.
Both supercontinuum generation and pulse synthesis were fully fiber-integrated.

Conclusions:

Fiber-based spectral slicing and re-amplification is an effective method for synthesizing ultrashort pulses.
The developed technique is versatile and applicable for pulse generation across the 1000-2000 nm range.
This approach offers a flexible platform for generating tunable, high-quality picosecond pulses.