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Tunable phase conjugation in a Ti:sapphire amplifier.

G J Crofts, X Banti, M J Damzen

|October 29, 2009

Summary

This study demonstrates four-wave mixing via gain saturation in a laser-pumped titanium-sapphire amplifier for the first time. High gain and energy reflectivity were achieved for nanosecond pulses.

Area of Science:

Nonlinear Optics
Laser Physics
Materials Science

Background:

Titanium-sapphire (Ti:sapphire) lasers are crucial for tunable laser generation.
Understanding nonlinear optical processes like four-wave mixing is essential for advanced laser applications.
Gain saturation effects in amplifiers can lead to complex nonlinear phenomena.

Purpose of the Study:

To demonstrate four-wave mixing (FWM) by gain saturation in a laser-pumped Ti:sapphire amplifier.
To investigate the performance of Ti:sapphire amplifiers under intense pumping conditions for nonlinear optics.
To characterize the energy reflectivity of FWM in this system.

Main Methods:

Utilizing intense laser pumping at 532 nm to excite the Ti:sapphire amplifier.

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Operating the amplifier in a regime where gain saturation occurs.

Measuring the output characteristics, including small-signal gain and FWM energy reflectivity, for nanosecond pulses at 780 nm.

Main Results:

Achieved a small-signal gain exceeding 250 in the Ti:sapphire amplifier.
Observed four-wave mixing energy reflectivity as high as 360% for nanosecond pulses.
Demonstrated FWM by gain saturation in a laser-pumped Ti:sapphire amplifier for the first time.

Conclusions:

Laser-pumped Ti:sapphire amplifiers can exhibit significant four-wave mixing due to gain saturation.
The high gain and reflectivity achieved indicate potential for novel nonlinear optical applications.
This work opens new avenues for utilizing Ti:sapphire amplifiers in nonlinear frequency conversion processes.