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Integrated ultrafast saturable absorber.

A Villeneuve, J S Aitchison, J U Kang

|October 22, 2009

Summary

Researchers demonstrated an ultrafast saturable absorber in AlGaAs near 1555 nm. This device, based on spatial soliton emission, allows independent design of saturation intensity and linear transmission, achieving a 50% transmission increase.

Area of Science:

Optoelectronics
Semiconductor devices
Nonlinear optics

Background:

Ultrafast saturable absorbers are crucial for mode-locked lasers and optical switching.
AlGaAs (Aluminum Gallium Arsenide) offers tunable bandgap properties for optoelectronic applications.
Operating below half the band gap enables specific nonlinear optical effects.

Purpose of the Study:

To experimentally demonstrate an ultrafast saturable absorber in AlGaAs.
To achieve independent design of saturation intensity and linear transmission.
To utilize spatial soliton emission for enhanced device performance.

Main Methods:

Fabrication of a tapered channel waveguide structure in AlGaAs.
Experimental operation of the saturable absorber at a photon energy below half the band gap (~1555 nm).

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Characterization of transmission properties and comparison with numerical simulations.

Main Results:

Successful demonstration of an ultrafast saturable absorber in AlGaAs.
Achieved independent control over saturation intensity and linear transmission.
Observed a 50% increase in transmission due to spatial soliton emission.
Experimental results showed good agreement with numerical simulations.

Conclusions:

The demonstrated AlGaAs saturable absorber offers design flexibility for optoelectronic applications.
Spatial soliton emission is an effective mechanism for enhancing transmission in such devices.
The device shows promise for ultrafast photonics and optical signal processing.