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Amplification of solitary optical waves in fibers with positive group velocity dispersion

100%

Arabadzhiev T., Uzunov I.

Open Physics

2007

vol. 5

issue 1

62-69

Solitary optical waves with characteristic red frequency shift have been numerically identified in fibers with positive group velocity dispersion in the presence of amplification by semiconductor amplifiers. Influence of the Henry factor, the net gain, gain saturation characteristics, and frequency modulation on the frequency shift of the observed solitary optical waves has been examined. Normalized pulse energy as a function of the gain saturation characteristics has been studied.

High-quality MBE growth of AlχGa1-χ As-based THz quantum cascade lasers

81%

Roch T., Andrews A., Fasching G., Benz A., Schrenk W., Unterrainer K., Strasser G.

Open Physics

2007

vol. 5

issue 2

244-251

High-quality GaAs-based quantum cascade laser (QCL) structures for the terahertz (THz) emission have been grown by solid source molecular-beam epitaxy. Ex-situ high-resolution x-ray diffraction shows that layer thickness and its control is the most critical growth aspect and that the lasing potential of the structure can be determined by the thickness accuracy of the layers. For our samples, the thickness tolerance for working lasing structures emitting approximately 100 μm was determined to be minimally above 1% for a 15 μm active region which was composed of 54.6 nm cascade cells. Increasing interface roughness adversely affects the lasing threshold and power.

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2 Open Physics

2 2007

1 Andrews A.

1 Arabadzhiev T.

1 Benz A.

1 Fasching G.

1 Roch T.

1 Schrenk W.

1 Strasser G.

1 Unterrainer K.

1 Uzunov I.

Search results

Amplification of solitary optical waves in fibers with positive group velocity dispersion

High-quality MBE growth of AlχGa1-χ As-based THz quantum cascade lasers