Mid-infrared quantum cascade laser integrated with distributed Bragg reflector

Quantum cascade lasers (QCLs) are promising as compact light sources in the mid-infrared region. In order to put them into a practical use, their relatively high threshold currents should be reduced. Facet reflectivity increase by distributed Bragg reflector (DBR) is effective for this purpose, but there have been few reports on DBR-integrated QCLs (DBRQCLs). In this paper, we report a successful operation of a DBR-QCL in 7 μm wavelength region. With the fabrication, an n-InP buffer layer, a core region consisting of AlInAs/GaInAs superlattices, an n-InP cladding layer, and an n-GaInAs contact layer were successively grown on an n-InP substrate using OMVPE in the first growth. Then, the wafer was processed into a mesa-stripe, and it was buried by an Fe-doped InP current-blocking layer to form a buriedheterostructure (BH) waveguide. After that, a DBR in which semiconductor-walls and air-gaps were alternately arranged was formed at the front or end of the cavity by dry-etching the epitaxial layers of the air-gap regions, and thus a DBRQCL was fabricated. A DBR-QCL chip (Mesa-width:10 μm, Cavity-legth:2 mm) which had a DBR-structure consisting of 1 pair of a 3λ/4-thick semiconductor-wall/3λ/4-thick air-gap at the front end and a high reflective facet at the rear end oscillated successfully under continuous-wave condition at 15°C. This is the first report on the InP-based DBR-QCL to our knowledge. The facet reflectivity at the DBR was 66%, which was about two times larger than that of the cleaved facet. This result clearly shows that the DBR-structure is effective for threshold current reduction of QCL.

[1]  Catherine Caneau,et al.  High-temperature continuous-wave operation of low power consumption single-mode distributed-feedback quantum-cascade lasers at λ∼5.2 μm , 2009 .

[2]  Manijeh Razeghi,et al.  Room temperature continuous wave operation of quantum cascade lasers with 12.5% wall plug efficiency , 2008 .

[3]  Hirofumi Kan,et al.  Room temperature, continuous-wave operation of quantum cascade lasers with single phonon resonance-continuum depopulation structures grown by metal organic vapor-phase epitaxy , 2007 .

[4]  Manijeh Razeghi,et al.  Room temperature continuous wave operation of quantum cascade lasers with watt-level optical power , 2008 .

[5]  J. Faist,et al.  The Quantum Cascade Laser , 1994 .

[6]  Yagi Hideki,et al.  Mid-IR vertical transition DFB quantum cascade laser , 2012 .

[7]  Carlo Sirtori,et al.  Pulsed and continuous-wave operation of long wavelength infrared (/spl lambda/=9.3 /spl mu/m) quantum cascade lasers , 1997 .

[8]  Manijeh Razeghi,et al.  High-power, room-temperature, and continuous-wave operation of distributed-feedback quantum-cascade lasers at λ∼4.8μm , 2005 .

[9]  Manijeh Razeghi,et al.  High-power continuous-wave operation of a 6 μm quantum-cascade laser at room temperature , 2003 .

[10]  Mattias Beck,et al.  Continuous Wave Operation of a Mid-Infrared Semiconductor Laser at Room Temperature , 2001, Science.

[11]  Kenichi Iga,et al.  A Novel Short-Cavity Laser with Deep-Grating Distributed Bragg Reflectors , 1996 .

[12]  Federico Capasso,et al.  Room temperature continuous-wave operation of quantum-cascade lasers grown by metal organic vapour phase epitaxy , 2005 .

[13]  Carlo Sirtori,et al.  Distributed feedback quantum cascade lasers , 1997 .