Low Frequency and Circuit Based Quantum Cascade Lasers: Recent Progress in Terahertz Quantum Cascade Lasers - Christoph Walther - Livros - Südwestdeutscher Verlag für Hochschulsch - 9783838128573 - 7 de setembro de 2011
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Low Frequency and Circuit Based Quantum Cascade Lasers: Recent Progress in Terahertz Quantum Cascade Lasers

Christoph Walther

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Low Frequency and Circuit Based Quantum Cascade Lasers: Recent Progress in Terahertz Quantum Cascade Lasers

Quantum cascade lasers are unipolar semiconductor lasers based on intersubband transitions in quantum wells. They have shown laser operation from above 100 THz down to the terahertz region and are promising sources for the terahertz region (0.3-10 THz) which is lacking of efficient narrowband radiation sources. A low frequency quantum cascade laser design is developed that faces the emerging challenges when the photon energy approaches the broadening of the energy levels. A record lowest operation frequency of 1.2 THz is demonstrated. A hybrid laser-oscillator for the terahertz is developed in the second part of this work, consisting of an optical gain medium and an electronic resonator. The resonator is an inductor-capacitor resonant circuit. The so called circuit based laser has the property of being a deep sub-wavelength sized microcavity laser. The effective mode volume is among the smallest for electrically pumped lasers. The circuit based resonator in combination with an active region could lead to a class of new devices to generate and manipulate terahertz radiation that exploit cavity quantum electrodynamic effects.

Mídia Livros     Paperback Book   (Livro de capa flexível e brochura)
Lançado 7 de setembro de 2011
ISBN13 9783838128573
Editoras Südwestdeutscher Verlag für Hochschulsch
Páginas 244
Dimensões 150 × 14 × 226 mm   ·   381 g
Idioma German  

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