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Self-Locking Screw

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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
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Related Experiment Video

Updated: Jun 19, 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

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All-solid-state self-mode locking of a Nd:YLF laser.

J R Lincoln, A I Ferguson

|October 27, 2009

Summary

A novel X-fold cavity design enhances the stability and performance of Kerr-lens mode-locked Neodymium-doped Yttrium Lithium Fluoride (Nd:YLF) lasers. This all-solid-state laser system achieves self-starting 3 ps pulses, improving upon previous designs.

Area of Science:

Laser Physics
Solid-State Lasers
Nonlinear Optics

Background:

Kerr-lens mode-locking (KLM) is a powerful technique for generating ultrashort laser pulses.
Neodymium-doped Yttrium Lithium Fluoride (Nd:YLF) lasers are widely used for their favorable optical properties.
Previous KLM Nd:YLF lasers have faced challenges with stability and self-starting behavior.

Purpose of the Study:

To develop an all-solid-state, Kerr-lens mode-locked Nd:YLF laser with improved performance.
To investigate the efficacy of a simple X-fold cavity design for passive mode-locking.
To enhance pulse stability and self-starting capabilities in Nd:YLF lasers.

Main Methods:

Implementation of a simple X-fold cavity design separating gain and nonlinear media.

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Utilizing a Nd:YLF gain medium.

Characterization of pulse duration, stability, and self-starting behavior.

Main Results:

Achieved self-starting pulses with a duration of 3 picoseconds (ps).
Demonstrated significant enhancements in laser stability compared to previous KLM Nd:YLF lasers.
Observed improved self-starting behavior in the mode-locking process.

Conclusions:

The X-fold cavity design offers a simple yet effective approach for passive mode-locking.
This design provides substantial improvements in stability and self-starting for KLM Nd:YLF lasers.
The benefits of this cavity configuration are applicable to general passive mode-locking of diode-pumped solid-state lasers.