Low-threshold quantum-cascade lasers without injector regions, emitting at /spl lambda/ /spl sim/ 6.7 /spl mu/m

Author

Friedrich, A. ; Boehm, G. ; Amann, M.C.

Author_Institution

Walter Schottky Inst., Technische Univ. Munchen, Garching

fYear

0

fDate

0-0 0

Firstpage

19

Lastpage

22

Abstract

We report on an unusual quantum-cascade laser design without injector miniband, designed as a five-level staircase. The aim of this design scheme is to prevent a thermal backfilling of the lower laser state, by using a double or triple LO-phonon resonance, respectively. These lasers show exceedingly small threshold current densities at low temperatures (0.2 kA/cm² at 77 K) and a threshold voltage of about 10 V. At 300 K, threshold current densities of ~2 kA/cm² are achieved and the maximum operating temperature in pulsed mode is 380 K

Keywords

phonons; quantum cascade lasers; stimulated emission; 10 V; 300 K; 380 K; 6.7 mum; 77 K; LO-phonon resonance; five-level staircase design; laser design; low-threshold lasers; pulsed mode; quantum-cascade lasers; Electrons; Gas lasers; Laser modes; Laser transitions; Optical design; Power lasers; Quantum cascade lasers; Resonance; Temperature; Threshold current;

fLanguage

English

Publisher

ieee

Conference_Titel

Indium Phosphide and Related Materials Conference Proceedings, 2006 International Conference on

Conference_Location

Princeton, NJ

Print_ISBN

0-7803-9558-1

Type

conf

DOI

10.1109/ICIPRM.2006.1634101

Filename

1634101