Tunable terahertz quantum cascade lasers with an external cavity

Tunable quantum cascade lasers operating in the terahertz frequency range are demonstrated. By using an external cavity based on the reflection from a movable mirror, both broad and fine tuning of the frequency are achieved by varying the cavity length. Coarse tuning up to 3cm−1 is obtained near the center frequency of 4.8THz (∼160cm−1), and continuous mode-hop-free tuning is observed over ∼ 0.4cm−1, nearly corresponding to the cavity free spectral range.

[1]  S Wang,et al.  T-ray Imaging and Tomography , 2003, Journal of biological physics.

[2]  A. Tredicucci,et al.  Single-mode operation of terahertz quantum cascade lasers with distributed feedback resonators , 2004, Conference on Lasers and Electro-Optics, 2004. (CLEO)..

[3]  David A. Ritchie,et al.  High-resolution gas phase spectroscopy with a distributed feedback terahertz quantum cascade laser , 2006 .

[4]  Marcella Giovannini,et al.  External cavity quantum-cascade laser tunable from 8.2to10.4μm using a gain element with a heterogeneous cascade , 2006 .

[5]  E. Linfield,et al.  Terahertz semiconductor-heterostructure laser , 2002, Nature.

[6]  H. Kogelnik,et al.  Coupled‐Wave Theory of Distributed Feedback Lasers , 1972 .

[7]  P. Taday,et al.  Detection and identification of explosives using terahertz pulsed spectroscopic imaging , 2005 .

[8]  Carlo Sirtori,et al.  High-performance continuous-wave operation of superlattice terahertz quantum-cascade lasers , 2003 .

[9]  B. Ishaug,et al.  Grating-tuned external-cavity quantum-cascade semiconductor lasers , 2001 .

[10]  A. Cho,et al.  External-cavity tunable mid-infrared laser using off-band surface-emitting Bragg grating coupler , 2005 .

[11]  Mattias Beck,et al.  Broadband tuning of external cavity bound-to-continuum quantum-cascade lasers , 2004 .

[12]  A Müller,et al.  Mid-infrared external-cavity quantum-cascade laser. , 2002, Optics letters.

[13]  D. Mittleman.  Sensing with terahertz radiation , 2003 .

[14]  H. Beere,et al.  Surface plasmon photonic structures in terahertz quantum cascade lasers. , 2006, Optics express.