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Updated: Jun 25, 2026

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

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

Published on: November 22, 2019

Optical limiting for microsecond pulses.

Sergey Gavrilyuk¹, Ji-Cai Liu, Kenji Kamada

¹Theoretical Chemistry, Royal Institute of Technology, Roslagstullsbacken 15, S-106 91 Stockholm, Sweden.

The Journal of Chemical Physics

|February 12, 2009

Summary

This summary is machine-generated.

We developed a dynamical theory for microsecond laser pulse absorption and propagation, identifying triplet-triplet transitions as key for fullerene C(60) optical limiting. This theory simplifies to a ground state population equation, crucial for understanding nonlinear absorption dynamics.

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Area of Science:

Nonlinear optics
Quantum optics
Materials science

Background:

Fullerene C(60) exhibits significant optical limiting properties.
Understanding nonlinear absorption dynamics is crucial for optical limiting applications.

Purpose of the Study:

To present a dynamical theory for microsecond laser pulse propagation and nonlinear absorption.
To investigate the primary mechanisms of nonlinear absorption in fullerene C(60).
To analyze the role of pulse propagation in optical power limiting.

Main Methods:

Developed a dynamical theory for nonlinear absorption and propagation.
Applied the theory to fullerene C(60) using coupled rate equations.
Reduced rate equations to a single dynamical equation for ground state population.
Numerically solved the paraxial field equation and rate equation.

Main Results:

Sequential absorption via triplet-triplet transitions is the dominant nonlinear absorption mechanism in C(60).
An adiabatic approximation simplifies the rate equations.
Pulse propagation significantly impacts optical power limiting by altering absorption processes.
Nonlinear absorption weakens, transitioning to linear absorption as the pulse propagates.

Conclusions:

The developed dynamical theory accurately describes nonlinear absorption and propagation in fullerene C(60).
Triplet-triplet absorption is the main contributor to optical limiting.
Propagation effects are critical for optimizing optical power limiting devices.