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A linear optical trap with active medium for experiments with high power laser pulses.

Tarek Mohamed¹, Guillermo Andler², Reinhold Schuch¹

¹Physics Department, Stockholm University, AlbaNova, 10691 Stockholm, Sweden.

The Review of Scientific Instruments

|March 2, 2015

Summary

Researchers developed a linear optical trap to circulate high-power laser pulses at high frequencies. This system enhances laser pulse efficiency up to 60 times by managing optical losses and controlling pulse timing.

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Area of Science:

Optics and Photonics
Laser Physics
Experimental Physics

Background:

High-power laser pulses require efficient manipulation for various applications.
Existing methods for circulating laser pulses often face limitations in efficiency and tunability.

Purpose of the Study:

To develop a linear optical trap capable of circulating high-power laser pulses.
To achieve high repetition frequencies (tens of MHz) for trapped laser pulses.
To enhance the efficiency of laser pulse interaction within an experimental setup.

Main Methods:

A linear optical trap was constructed using two highly reflecting mirrors.
Nanosecond excimer-pumped dye laser pulses were injected using a Wollaston prism and a synchronized Pockels cell.

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The system was tested at 580 nm, with potential for broad wavelength operation (400-700 nm).

Main Results:

The optical trap demonstrated a 7-fold increase in efficiency compared to single-pass laser pulse systems.
Pulse timing and structure were controllable by adjusting the distance between the mirrors.
Introduction of an amplifying cell compensated for optical losses, yielding a 60-fold efficiency enhancement.

Conclusions:

The developed linear optical trap effectively circulates high-power laser pulses at high repetition rates.
The system offers significant efficiency gains, particularly when optical losses are compensated.
Tunable pulse structures and broad wavelength applicability make this trap valuable for laser research.