Low Frequency and Circuit based Quantum Cascade Lasers
Christoph Walther
Broschiertes Buch

Low Frequency and Circuit based Quantum Cascade Lasers

Recent progress in Terahertz Quantum Cascade Lasers

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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...