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Updated: Jun 19, 2026

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

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Kerr-lens mode-locked diode-pumped Cr:LiSGAF laser.

V P Yanovsky, F W Wise, A Cassanho

|October 28, 2009

Summary

We demonstrated stable, self-sustaining Kerr-lens mode locking in a Cr:LiSGAF laser using AlGaInP laser diodes. This all-solid-state system produces 100-fs pulses tunable from 810-860 nm with low power fluctuations.

Area of Science:

Laser Physics
Solid-State Lasers

Background:

Cr:LiSGAF lasers offer potential for tunable ultrashort pulse generation.
AlGaInP laser diodes provide a compact and efficient pumping source.

Purpose of the Study:

To demonstrate stable and self-sustaining Kerr-lens mode locking in a Cr:LiSGAF laser.
To characterize the performance of such a laser system.

Main Methods:

Utilized a Cr:LiSGAF crystal as the gain medium.
Employed AlGaInP laser diodes for optical pumping.
Implemented Kerr-lens mode locking with a hard aperture for amplitude modulation.

Main Results:

Achieved stable and self-sustaining Kerr-lens mode locking.
Generated transform-limited pulses with a duration of 100 femtoseconds (fs).

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Demonstrated tunability of the output pulses from 810 to 860 nanometers (nm).

Obtained an average output power of 35 milliwatts (mW) at 830 nm with minimal power fluctuations (<1%).

Conclusions:

The demonstrated all-solid-state system is capable of producing high-quality ultrashort laser pulses.
The thermal properties of Cr:LiSGAF suggest potential for power scaling.
This work paves the way for practical applications requiring tunable femtosecond lasers.