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Compact, high-gain pulsed dye amplifier for weak cw sources.

J F Black, J J Valentini

|October 12, 2010

Summary

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This study demonstrates a compact dye amplifier that boosts weak visible laser pulses by over a billion times. The system achieves high-energy, stable pulses suitable for various laser applications.

Area of Science:

Laser physics
Nonlinear optics
Optical engineering

Background:

Continuous-wave (cw) visible lasers offer potential for various applications but often lack the pulse energy required.
Existing amplification techniques can be complex, bulky, or require specialized components like Faraday isolators.

Purpose of the Study:

To demonstrate a compact, high-gain dye amplifier system for weak cw visible laser sources.
To achieve significant pulse energy amplification with high stability and minimal linewidth broadening.
To explore the scalability and applicability to other laser types, such as tunable diode lasers.

Main Methods:

Utilized a two-cuvette dye amplifier configuration.
Employed a 300-µW single-frequency Helium-Neon (He-Ne) laser as the seed source.

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Performed preamplification and subsequent power amplification stages without a Faraday isolator.

Main Results:

Achieved pulse amplification factors exceeding 10^9.
Preamplifier output: >40-µJ pulses, 4.5-ns duration, 1.4x transform-limited linewidths (~140 MHz).
Power amplifier output: 4-ns FWHM, 2-mJ pulses with excellent pulse-to-pulse stability and ~170 MHz linewidths.

Conclusions:

Successfully demonstrated a compact and efficient dye amplifier for high-gain pulse amplification of weak cw visible lasers.
The system provides high-energy, stable output pulses with controlled linewidths.
The demonstrated approach is scalable and can be extended to amplify other laser sources, including tunable diode lasers.