High-performance continuous-wave operation of superlattice terahertz quantum-cascade lasers

Köhler, Rüdeger; Tredicucci, Alessandro; Beltram, Fabio; Beere, Harvey E.; Linfield, Edmund H.; Davies, A. Giles; Ritchie, David A.; Dhillon, Sukhdeep S.; Sirtori, Carlo
March 2003
Applied Physics Letters;3/10/2003, Vol. 82 Issue 10, p1518
Academic Journal
The cw operation of chirped-superlattice quantum-cascade lasers emitting at λ∼67 µm (4.4 THz) is analyzed. Collected (min. 33% efficiency) output powers of 4 mW per facet are measured at liquid helium temperatures and a maximum operating temperature of 48 K is reached. Under pulsed excitation at duty cycles of 0.5%-1%, slightly higher (10%) peak powers are reached, and the device can be operated up to 67 K. Low threshold current densities of 165 and 185 A cm[sup -2] are observed in pulsed and cw operation, respectively. The operation of the laser is examined using the Hakki-Paoli technique to estimate the net gain of the structure.


Related Articles

  • Efficient, high-power (>150 mW) grating surface emitting lasers. Evans, G. A.; Carlson, N. W.; Hammer, J. M.; Lurie, M.; Butler, J. K.; Carr, L. A.; Hawrylo, F. Z.; James, E. A.; Kaiser, C. J.; Kirk, J. B.; Reichert, W. F.; Chinn, S. R.; Shealy, J. R.; Zory, P. S. // Applied Physics Letters;3/28/1988, Vol. 52 Issue 13, p1037 

    Surface emitting AlGaAs second-order distributed Bragg reflector lasers using a superlattice graded-index separate confinement heterostructure with a single quantum well have been fabricated. The total peak power is emitted coherently from both gratings into a 0.06° full width half-power...

  • Room-temperature emission of GaAs/AlGaAs superlattice quantum-cascade lasers at 12.6 μm. Anders, S.; Schrenk, W.; Gornik, E.; Strasser, G. // Applied Physics Letters;3/18/2002, Vol. 80 Issue 11, p1864 

    We report on the lasing properties of quantum-cascade lasers that combine the advantage of strong electron confinement with the superior performance of superlattice structures. To achieve an optimum band offset between wells and barriers, we chose an Al content of the AlGaAs barriers of 45%. We...

  • High-temperature performance of GaAs-based bound-to-continuum quantum-cascade lasers. Pflügl, C.; Schrenk, W.; Anders, S.; Strasser, G.; Becker, C.; Sirtori, C.; Bonetti, Y.; Muller, A. // Applied Physics Letters;12/8/2003, Vol. 83 Issue 23, p4698 

    GaAs-based quantum-cascade lasers based on a bound-to-continuum transition have been realized and characterized. This band structure design combines the advantages of the well known three-well and superlattice active regions. We observed lasing of Fabry–Pérot lasers in pulsed mode up...

  • Superlattice AlAs/AlInAs-oxide current aperture for long wavelength InP-based vertical-cavity surface-emitting laser structure. Ohnoki, N.; Koyama, F.; Iga, K. // Applied Physics Letters;11/30/1998, Vol. 73 Issue 22 

    A superlattice AlAs/AlInAs structure which can be formed on an InP substrate is proposed and demonstrated for use in oxide confinement long wavelength surface emitting lasers. The large strain of AlAs layers is relaxed by the use of a superlattice structure showing no defects and uniform...

  • Parametric and cascaded parametric interactions in a quasiperiodic optical superlattice. Du, Y.; Zhu, S. N.; Zhu, Y. Y.; Xu, P.; Zhang, C.; Chen, Y. B.; Liu, Z. W.; Ming, N. B.; Zhang, X. R.; Zhang, F. F.; Zhang, S. Y. // Applied Physics Letters;8/26/2002, Vol. 81 Issue 9, p1573 

    Quasi-phase-matching optical parametric and cascaded parametric processes in a two-component quasiperiodic superlattice were studied in theory and experiment. This letter demonstrates how to obtain red at 666 nm and blue at 443 nm simultaneously from the superlattice using a 532 nm laser as a...

  • ZnSe-based blue-green lasers with a short-period superlattice waveguide. Ivanov, S.; Toropov, A.; Sorokin, S.; Shubina, T.; Lebedev, A.; Kop’ev, P.; Alferov, Zh.; Lugauer, H.-J.; Reuscher, G.; Keim, M.; Fischer, F.; Waag, A.; Landwehr, G. // Applied Physics Letters;10/12/1998, Vol. 73 Issue 15 

    We report the successful application of alternatively strained short-period superlattices for the waveguide region of optically pumped and injection room-temperature ZnSe-based lasers operating within the 470–523 nm spectral range. The design of optically pumped ZnMgSSe/ZnSSe/ZnCdSe...

  • GaAs/AlGaAs superlattice quantum cascade lasers at lambda is approximately equal to 13 mu m. Strasser, G.; Gianordoli, S.; Hvozdara, L.; Schrenk, W.; Unterrainer, K.; Gornik, E. // Applied Physics Letters;9/6/1999, Vol. 75 Issue 10, p1345 

    Reports on the realization of an injection laser based on intraband transitions in a finite AlGaAs/GaAs superlattice. Active material consisting of a 30 period sequence of injectors/active regions made from AlGaAs/GaAs quantum wells; Injection of electrons into the second miniband of a...

  • Rapid collapse of Wannier–Stark localization caused by space charge electric field screening in short-period superlattices. Hosoda, M.; Tominaga, K.; Vaccaro, P. O.; Watanabe, T.; Inomata, H.; Fujiwara, K. // Journal of Applied Physics;11/1/1996, Vol. 80 Issue 9, p5094 

    Focuses on a study which examined absorption saturation behaviors of short-period superlattices that exhibit the Wannier-Stark localization effect using a cw titanium sapphire laser. Experimental details; Results and discussion; Conclusions.

  • Polarization properties of a vertical cavity surface emitting laser using a fractional layer.... Chavez-Pirson, A.; Ando, H.; Saito, H.; Kanbe, H. // Applied Physics Letters;6/14/1993, Vol. 62 Issue 24, p3082 

    Investigates the polarization properties of a vertical cavity surface emitting laser using a fractional layer superlattice (FLS) gain medium. Anisotropy of the gain medium; Range of room-temperature wavelength lasing; Linear polarization states in the FLS surface emitting laser.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics