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L. Korte - One of the best experts on this subject based on the ideXlab platform.

  • Digital beam steering from surface-emitting laser diodes based on surface Mode Emission
    In-Plane Semiconductor Lasers: from Ultraviolet to Midinfrared, 1997
    Co-Authors: Anton Koeck, A. Golshani, R. Hainberger, E. Gornik, L. Korte
    Abstract:

    We present a surface emitting GaAs/AlGaAs laser diode beam steering device based on the surface Mode Emission (SME) technique. The SME-laser diodes operate in a single-Mode and show efficient surface Emission into a single beam with a minimum beam divergence of 0.11 degree(s). We demonstrate a large digital beam steering from this device, which is achieved by Mode switching. The special SME-structure supports two single-Mode Emission wavelengths, which are spaced by 8.38 nm. Digital switching between these two Modes by a proper current pulse sequence leads to a steering of the surface emitted single-beam by 4.9 degree(s). Presently the beam steering frequency is limited to a maximum value of 0.15 MHz. An optimized device design for a continuous steering of the single, surface emitted beam is proposed.

  • Single‐Mode and single‐beam Emission from surface emitting laser diodes based on surface‐Mode Emission
    Applied Physics Letters, 1996
    Co-Authors: A. Kock, A. Golshani, R. Hainberger, E. Gornik, L. Korte
    Abstract:

    Single‐Mode and single‐beam Emission have been achieved from surface emitting laser diodes based on the surface‐Mode‐Emission technique. By employing an optimized device design and a first‐order grating coupler, the laser diodes show under pulsed operation condition a single‐Mode Emission with a linewidth of 0.11 nm. A power up to 3.6 mW is emitted into a single, surface‐emitted beam, which has a beam divergence of 0.20°.

  • Adjustable surface Emission from AlGaAs/GaAs laser diodes based on first‐order‐grating coupled surface Mode Emission
    Applied Physics Letters, 1996
    Co-Authors: A. Golshani, A. Kock, E. Gornik, S. Freisleben, C. Gmachl, L. Korte
    Abstract:

    Strongly improved surface emitting laser diodes based on surface Mode Emission are presented. A first‐order‐grating was utilized for the excitation of the surface Modes. This results in an efficient quasi‐single‐beam surface Emission with low divergence and a significant narrowing in the Emission spectrum. A variation in the Emission wavelength of up to 4 nm is achieved by adjusting the surface waveguide thickness, which demonstrates the wavelength selection mechanism of the SME technique. The decisive advantage of the SME laser diodes in comparison to DFB/DBR laser diodes is their high flexibility in fabrication, which makes them very suitable for wavelength division multiplexing applications.

  • Efficient surface emitting AlGaAs/GaAs laser diodes based on first-order-grating-coupled surface Mode Emission
    1996
    Co-Authors: A. Golshani, A. Kock, R. Hainberger, E. Gornik, S. Freisleben, C. Gmachl, L. Korte
    Abstract:

    Strongly improved surface emitting laser diodes based on surface Mode Emission (SME) are presented. For the first time an effective coupling mechanism utilizing first-order-grating excitation of surface Modes is employed. This concept leads to an additional wavelength selection mechanism due to an efficient feedback effect, which can be used for single Mode Emission. A two-beam efficient surface Emission with low divergency is achieved and the additional wavelength selection and feedback mechanism is demonstrated. The decisive advantage of the SME laser diodes in comparison to DFB/DBR laser diodes is their flexibility in fabrication, which makes them very suitable , for example, for wavelength division multiplexing (WDM) applications.

  • Single-Beam and Single-Mode Emission from Surface Emitting Laser Diodes based on Surface Mode Emission
    ESSDERC '96: Proceedings of the 26th European Solid State Device Research Conference, 1996
    Co-Authors: A. Kock, A. Golshani, R. Hainberger, E. Gornik, L. Korte
    Abstract:

    Single-beam and single-Mode Emission from surface-Mode-emitting-(SME)-laser diodes is reported for the first time. The laser diodes emit via the surface into a single-beam with a beam divergence of 0.15° and show under pulsed operation a single-Mode Emission. The crucial feature of SME-laser diodes is their flexible processing, which enables the fabrication of laser diodes with desired radiation and Emission characteristics.

M Bugajski - One of the best experts on this subject based on the ideXlab platform.

  • Room temperature, single Mode Emission from two-section coupled cavity InGaAs/AlGaAs/GaAs quantum cascade laser
    Journal of Applied Physics, 2015
    Co-Authors: Kamil Pierściński, M Pluska, Piotr Gutowski, I Sankowska, Piotr Karbownik, D. Pierścińska, Andrzej Czerwiński, M Bugajski
    Abstract:

    Room temperature, single Mode, pulsed Emission from two-section coupled cavity InGaAs/AlGaAs/GaAs quantum cascade laser fabricated by focused ion beam processing is demonstrated and analyzed. The single Mode Emission is centered at 1059.4 cm−1 (9.44 μm). A side Mode suppression ratio of 43 dB was achieved. The laser exhibits a peak output power of 15 mW per facet at room temperature. The stable, single Mode Emission is observed within temperature tuning range, exhibiting shift at rate of 0.59 nm/K.

  • room temperature single Mode Emission from two section coupled cavity ingaas algaas gaas quantum cascade laser
    Journal of Applied Physics, 2015
    Co-Authors: K Pierścinski, D Pierścinska, M Pluska, Piotr Gutowski, I Sankowska, Piotr Karbownik, A Czerwinski, M Bugajski
    Abstract:

    Room temperature, single Mode, pulsed Emission from two-section coupled cavity InGaAs/AlGaAs/GaAs quantum cascade laser fabricated by focused ion beam processing is demonstrated and analyzed. The single Mode Emission is centered at 1059.4 cm−1 (9.44 μm). A side Mode suppression ratio of 43 dB was achieved. The laser exhibits a peak output power of 15 mW per facet at room temperature. The stable, single Mode Emission is observed within temperature tuning range, exhibiting shift at rate of 0.59 nm/K.

K Pierścinski - One of the best experts on this subject based on the ideXlab platform.

  • room temperature single Mode Emission from two section coupled cavity ingaas algaas gaas quantum cascade laser
    Journal of Applied Physics, 2015
    Co-Authors: K Pierścinski, D Pierścinska, M Pluska, Piotr Gutowski, I Sankowska, Piotr Karbownik, A Czerwinski, M Bugajski
    Abstract:

    Room temperature, single Mode, pulsed Emission from two-section coupled cavity InGaAs/AlGaAs/GaAs quantum cascade laser fabricated by focused ion beam processing is demonstrated and analyzed. The single Mode Emission is centered at 1059.4 cm−1 (9.44 μm). A side Mode suppression ratio of 43 dB was achieved. The laser exhibits a peak output power of 15 mW per facet at room temperature. The stable, single Mode Emission is observed within temperature tuning range, exhibiting shift at rate of 0.59 nm/K.

E. Gornik - One of the best experts on this subject based on the ideXlab platform.

  • Continuous-wave operation of distributed feedback AlAs/GaAs superlattice quantum-cascade lasers
    Applied Physics Letters, 2000
    Co-Authors: Werner Schrenk, E. Gornik, N. Finger, S. Gianordoli, Gottfried Strasser
    Abstract:

    We report on continuous-wave operation of first-order distributed feedback quantum-cascade lasers at λ=11.8 μm, based on interminiband transitions in a chirped AlAs/GaAs superlattice. Short devices operate in continuous-wave up to ∼30 K. The single-Mode Emission wavelength is continuously tunable with the temperature. A metallized surface-relief grating is used for feedback to achieve single-Mode Emission.

  • Digital beam steering from surface-emitting laser diodes based on surface Mode Emission
    In-Plane Semiconductor Lasers: from Ultraviolet to Midinfrared, 1997
    Co-Authors: Anton Koeck, A. Golshani, R. Hainberger, E. Gornik, L. Korte
    Abstract:

    We present a surface emitting GaAs/AlGaAs laser diode beam steering device based on the surface Mode Emission (SME) technique. The SME-laser diodes operate in a single-Mode and show efficient surface Emission into a single beam with a minimum beam divergence of 0.11 degree(s). We demonstrate a large digital beam steering from this device, which is achieved by Mode switching. The special SME-structure supports two single-Mode Emission wavelengths, which are spaced by 8.38 nm. Digital switching between these two Modes by a proper current pulse sequence leads to a steering of the surface emitted single-beam by 4.9 degree(s). Presently the beam steering frequency is limited to a maximum value of 0.15 MHz. An optimized device design for a continuous steering of the single, surface emitted beam is proposed.

  • Single‐Mode and single‐beam Emission from surface emitting laser diodes based on surface‐Mode Emission
    Applied Physics Letters, 1996
    Co-Authors: A. Kock, A. Golshani, R. Hainberger, E. Gornik, L. Korte
    Abstract:

    Single‐Mode and single‐beam Emission have been achieved from surface emitting laser diodes based on the surface‐Mode‐Emission technique. By employing an optimized device design and a first‐order grating coupler, the laser diodes show under pulsed operation condition a single‐Mode Emission with a linewidth of 0.11 nm. A power up to 3.6 mW is emitted into a single, surface‐emitted beam, which has a beam divergence of 0.20°.

  • Adjustable surface Emission from AlGaAs/GaAs laser diodes based on first‐order‐grating coupled surface Mode Emission
    Applied Physics Letters, 1996
    Co-Authors: A. Golshani, A. Kock, E. Gornik, S. Freisleben, C. Gmachl, L. Korte
    Abstract:

    Strongly improved surface emitting laser diodes based on surface Mode Emission are presented. A first‐order‐grating was utilized for the excitation of the surface Modes. This results in an efficient quasi‐single‐beam surface Emission with low divergence and a significant narrowing in the Emission spectrum. A variation in the Emission wavelength of up to 4 nm is achieved by adjusting the surface waveguide thickness, which demonstrates the wavelength selection mechanism of the SME technique. The decisive advantage of the SME laser diodes in comparison to DFB/DBR laser diodes is their high flexibility in fabrication, which makes them very suitable for wavelength division multiplexing applications.

  • Efficient surface emitting AlGaAs/GaAs laser diodes based on first-order-grating-coupled surface Mode Emission
    1996
    Co-Authors: A. Golshani, A. Kock, R. Hainberger, E. Gornik, S. Freisleben, C. Gmachl, L. Korte
    Abstract:

    Strongly improved surface emitting laser diodes based on surface Mode Emission (SME) are presented. For the first time an effective coupling mechanism utilizing first-order-grating excitation of surface Modes is employed. This concept leads to an additional wavelength selection mechanism due to an efficient feedback effect, which can be used for single Mode Emission. A two-beam efficient surface Emission with low divergency is achieved and the additional wavelength selection and feedback mechanism is demonstrated. The decisive advantage of the SME laser diodes in comparison to DFB/DBR laser diodes is their flexibility in fabrication, which makes them very suitable , for example, for wavelength division multiplexing (WDM) applications.

Claire F Gmachl - One of the best experts on this subject based on the ideXlab platform.

  • Single-Mode quantum cascade lasers employing a candy-cane shaped Fabry-Perot cavity
    CLEO: 2011 - Laser Science to Photonic Applications, 2011
    Co-Authors: Kamil Sladek, Xiaojun Wang, Claire F Gmachl
    Abstract:

    Single-Mode Quantum Cascade lasers employing a candy-cane shaped Fabry-Perot cavity are demonstrated. Single-Mode Emission with ~25 dB side Mode suppression is achieved up to ~500 mA above threshold current in pulsed operation.

  • Single-Mode quantum cascade lasers based on a folded Fabry-Perot cavity
    Applied Physics Letters, 2011
    Co-Authors: Peter Q. Liu, Jen-yu Fan, Xiaojun Wang, Claire F Gmachl
    Abstract:

    We demonstrate single-Mode quantum cascade lasers employing a folded Fabry-Perot cavity consisting of two straight sections connected by a semicircular section in a “hairpin” shape. These folded cavity lasers emitting at ∼4.5 μm are fabricated with identical processes as those for plain Fabry-Perot ridge lasers, and show a strong suppression of the comb of Fabry-Perot cavity Modes, leading to tunable single-Mode Emission with up to 27 dB side Mode suppression ratio and a single-Mode operating current range of up to 60% above the threshold current when operated in pulsed Mode; single-Mode Emission is achieved from 80 to ∼240 K.

  • Single-Mode Quantum Cascade lasers with a folded Fabry-Perot resonator waveguide
    CLEO QELS: 2010 Laser Science to Photonic Applications, 2010
    Co-Authors: Xiaojun Wang, Claire F Gmachl
    Abstract:

    We demonstrate single Mode operation of Quantum Cascade lasers employing a folded Fabry-Perot resonator waveguide design. Single Mode Emission is achieved with ~20dB side Mode suppression up to ~400mA above threshold current in pulsed operation.

  • Mid-infrared (λ≈7.4 μm) quantum cascade laser amplifier for high power single-Mode Emission and improved beam quality
    Applied Physics Letters, 2002
    Co-Authors: Mariano Troccoli, Claire F Gmachl, Federico Capasso, Deborah L. Sivco
    Abstract:

    A quantum cascade laser amplifier has been developed. It was used to obtain high power single-Mode Emission at λ≈7.4 μm from a quantum cascade distributed feedback laser, together with enhanced beam quality. Laser and amplifier are directly coupled in a master oscillator power amplifier configuration. Peak optical powers of 0.5 W at 80 K have been obtained. Ninety percent of the total power is thereby emitted within a divergence of 20° in the lateral direction. The device showed single Mode operation with a side Mode suppression ratio of 30 dB in the temperature range from 10 to 280 K. This allowed tuning of the Emission wavelength in the range from 7.36 to 7.46 μm. The estimated peak amplifier gain is 6.4 and 4.9 dB at 80 and 300 K, respectively, and the cavity losses are 12.5 and 22 cm−1 at the corresponding temperatures.

  • mid infrared λ 7 4 μm quantum cascade laser amplifier for high power single Mode Emission and improved beam quality
    Applied Physics Letters, 2002
    Co-Authors: Mariano Troccoli, Claire F Gmachl, Federico Capasso, Deborah L. Sivco
    Abstract:

    A quantum cascade laser amplifier has been developed. It was used to obtain high power single-Mode Emission at λ≈7.4 μm from a quantum cascade distributed feedback laser, together with enhanced beam quality. Laser and amplifier are directly coupled in a master oscillator power amplifier configuration. Peak optical powers of 0.5 W at 80 K have been obtained. Ninety percent of the total power is thereby emitted within a divergence of 20° in the lateral direction. The device showed single Mode operation with a side Mode suppression ratio of 30 dB in the temperature range from 10 to 280 K. This allowed tuning of the Emission wavelength in the range from 7.36 to 7.46 μm. The estimated peak amplifier gain is 6.4 and 4.9 dB at 80 and 300 K, respectively, and the cavity losses are 12.5 and 22 cm−1 at the corresponding temperatures.