The Experts below are selected from a list of 8889 Experts worldwide ranked by ideXlab platform
Kent D. Choquette - One of the best experts on this subject based on the ideXlab platform.
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Cold-cavity measurement of optical loss from oxide-confined vertical-cavity Surface-Emitting Lasers
Applied Physics Letters, 2014Co-Authors: Stewart T. M. Fryslie, Dominic F. Siriani, Kent D. ChoquetteAbstract:Microcavity laser design and performance optimization requires a quantitative knowledge of the cavity optical losses. A generalized method using sub-threshold spectral measurements matched to model calculations is demonstrated to determine optical loss in microcavity Lasers. Cold-cavity spectral characteristics are used to extract the size-dependent optical loss for small diameter oxide-confined vertical-cavity Surface Emitting Lasers. For oxide aperture diameters less than 4 μm, the oxide scattering loss can be greater than 10 cm−1, similar to the typical values of free carrier absorption loss.
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single mode photonic crystal vertical cavity Surface Emitting Lasers with modulation bandwidth 13 ghz at low current density
IEEE Photonics Conference, 2012Co-Authors: Michael Renne Ty Tan, Stewart T. M. Fryslie, J A Lott, Nikolay N Ledentov, Kent D. ChoquetteAbstract:Single mode photonic crystal vertical cavity Surface Emitting Lasers with a modulation bandwidth exceeding 13 GHz are achieved at current density as low as 3.7 kA/cm2 by separating the current and lasing apertures.
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single mode photonic crystal vertical cavity Surface Emitting Lasers
Advances in Optical Technologies, 2012Co-Authors: Kent D. Choquette, Paul O. Leisher, Joshua D. Sulkin, Dominic F. Siriani, J J Raftery, Ansas Matthias Kasten, Aaron James DannerAbstract:We review the design, fabrication, and performance of photonic crystal vertical cavity Surface Emitting Lasers (VCSELs). Using a periodic pattern of etched holes in the top facet of the VCSEL, the optical cavity can be designed to support the fundamental mode only. The electrical confinement is independently defined by proton implantation or oxide confinement. By control of the refractive index and loss created by the photonic crystal, operation in the Gaussian mode can be insured, independent of the lasing wavelength.
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mode control in photonic crystal vertical cavity Surface Emitting Lasers and coherent arrays
IEEE Journal of Selected Topics in Quantum Electronics, 2009Co-Authors: Dominic F. Siriani, Paul O. Leisher, Joshua D. Sulkin, J J Raftery, Aaron James Danner, Ansas Matthias Kasten, A C L Harren, Antonios V Giannopoulos, Kent D. ChoquetteAbstract:We demonstrate transverse mode control in vertical-cavity Surface-Emitting Lasers (VCSELs) and 2-D VCSEL arrays. By etching a periodic arrangement of circular holes into the top distributed Bragg reflector mirror, we are able to control the lasing modes through index and loss confinement. Theoretical modeling of these confinement effects are shown to be consistent with experimental measurements. Photonic crystal etched patterns and ion-implanted photonic lattices have been employed to fabricate coherently-coupled 2-D arrays. Control of the array supermodes from the out-of-phase and in-phase conditions is discussed. Designs of photonic crystal coherent VCSEL arrays for high-power emission and beam steering applications are described.
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effect of oxide aperture on the performance of 850 nm vertical cavity Surface Emitting Lasers
Optik, 2009Co-Authors: Mohd A Sharizal, Paul O. Leisher, Kent D. Choquette, Pankaj Kumar Choudhury, S M Mitani, Mohd Y Razman, A Abdul M FatahAbstract:Abstract An experimental study has been presented of the oxide-confined vertical-cavity Surface-Emitting Lasers (VCSELs) operating in the 850 nm region of the electromagnetic spectrum. In this regard, various relevant VCSEL samples with numerous oxide aperture sizes have been fabricated and characterized. Thorough investigations of the electrical as well as optical characteristics of the fabricated samples have been performed, which include the overall device performance as a function of the oxidize aperture sizes. It is reported that the VCSELs with oxide aperture size
Paul O. Leisher - One of the best experts on this subject based on the ideXlab platform.
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single mode photonic crystal vertical cavity Surface Emitting Lasers
Advances in Optical Technologies, 2012Co-Authors: Kent D. Choquette, Paul O. Leisher, Joshua D. Sulkin, Dominic F. Siriani, J J Raftery, Ansas Matthias Kasten, Aaron James DannerAbstract:We review the design, fabrication, and performance of photonic crystal vertical cavity Surface Emitting Lasers (VCSELs). Using a periodic pattern of etched holes in the top facet of the VCSEL, the optical cavity can be designed to support the fundamental mode only. The electrical confinement is independently defined by proton implantation or oxide confinement. By control of the refractive index and loss created by the photonic crystal, operation in the Gaussian mode can be insured, independent of the lasing wavelength.
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mode control in photonic crystal vertical cavity Surface Emitting Lasers and coherent arrays
IEEE Journal of Selected Topics in Quantum Electronics, 2009Co-Authors: Dominic F. Siriani, Paul O. Leisher, Joshua D. Sulkin, J J Raftery, Aaron James Danner, Ansas Matthias Kasten, A C L Harren, Antonios V Giannopoulos, Kent D. ChoquetteAbstract:We demonstrate transverse mode control in vertical-cavity Surface-Emitting Lasers (VCSELs) and 2-D VCSEL arrays. By etching a periodic arrangement of circular holes into the top distributed Bragg reflector mirror, we are able to control the lasing modes through index and loss confinement. Theoretical modeling of these confinement effects are shown to be consistent with experimental measurements. Photonic crystal etched patterns and ion-implanted photonic lattices have been employed to fabricate coherently-coupled 2-D arrays. Control of the array supermodes from the out-of-phase and in-phase conditions is discussed. Designs of photonic crystal coherent VCSEL arrays for high-power emission and beam steering applications are described.
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effect of oxide aperture on the performance of 850 nm vertical cavity Surface Emitting Lasers
Optik, 2009Co-Authors: Mohd A Sharizal, Paul O. Leisher, Kent D. Choquette, Pankaj Kumar Choudhury, S M Mitani, Mohd Y Razman, A Abdul M FatahAbstract:Abstract An experimental study has been presented of the oxide-confined vertical-cavity Surface-Emitting Lasers (VCSELs) operating in the 850 nm region of the electromagnetic spectrum. In this regard, various relevant VCSEL samples with numerous oxide aperture sizes have been fabricated and characterized. Thorough investigations of the electrical as well as optical characteristics of the fabricated samples have been performed, which include the overall device performance as a function of the oxidize aperture sizes. It is reported that the VCSELs with oxide aperture size
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manufacturable photonic crystal single mode and fluidic vertical cavity Surface Emitting Lasers
IEEE Journal of Selected Topics in Quantum Electronics, 2008Co-Authors: Ansas Matthias Kasten, Paul O. Leisher, Joshua D. Sulkin, David K Mcelfresh, D Vacar, Kent D. ChoquetteAbstract:We describe a robust manufacturing process for single-mode photonic crystal (PhC) vertical-cavity Surface-Emitting Lasers (VCSELs). Various PhC designs are investigated to determine endlessly single-mode designs, whereby the same PhC design yields single-mode operation for three different wavelengths (780, 850, and 980 nm). The fabrication of the PhC pattern is based on a self-aligned optical lithography process. The fabrication process results in VCSELs with a maximum output power greater than 1 mW under continuous-wave (CW) operation with side-mode suppression ratio greater than 35 dB. We also show microfluidic laser structures that are enabled by our fabrication process, which integrate fluid channels into VCSELs. Optical and electrical properties of these microfluidic VCSELs are investigated with and without fluids present under CW and pulsed operation. A shift of the lasing wavelength is found with fluid insertion.
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loss induced confinement in photonic crystal vertical cavity Surface Emitting Lasers
Lasers and Electro-Optics Society Meeting, 2007Co-Authors: Dominic F. Siriani, Paul O. Leisher, Kent D. ChoquetteAbstract:It was demonstrated in this paper that loss can have a significant role in the modal characteristics of etched photonic crystal vertical cavity Surface-Emitting Lasers (VCSELs) and, in fact, can be a primary mechanism of maintaining single-mode operation. Comparisons of calculated modal losses with mode splitting, etch depth, slope efficiency, and single- or multi-mode operation serve to verify the model. This work demonstrates that loss is a non-negligible effect in analyzing photonic crystal VCSELs, and this theory can serve to aid in the design of single-mode photonic crystal VCSELs.
Jerome V Moloney - One of the best experts on this subject based on the ideXlab platform.
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mode locking in vertical external cavity Surface Emitting Lasers with type ii quantum well configurations
Applied Physics Letters, 2019Co-Authors: I Kilen, Jorg Hader, Stephan W Koch, Jerome V MoloneyAbstract:A microscopic study of mode-locked pulse generation is presented for vertical external-cavity Surface-Emitting Lasers utilizing type-II quantum well configurations. The coupled Maxwell semiconductor Bloch equations are solved numerically where the type-II carrier replenishment is modeled via suitably chosen reservoirs. Conditions for stable mode-locked pulses are identified allowing for pulses in the 100 fs range. Design strategies for type-II configurations are proposed that avoid potentially unstable pulse dynamics.A microscopic study of mode-locked pulse generation is presented for vertical external-cavity Surface-Emitting Lasers utilizing type-II quantum well configurations. The coupled Maxwell semiconductor Bloch equations are solved numerically where the type-II carrier replenishment is modeled via suitably chosen reservoirs. Conditions for stable mode-locked pulses are identified allowing for pulses in the 100 fs range. Design strategies for type-II configurations are proposed that avoid potentially unstable pulse dynamics.
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mode locking in vertical external cavity Surface Emitting Lasers with type ii quantum well configurations
arXiv: Optics, 2019Co-Authors: I Kilen, Jorg Hader, Stephan W Koch, Jerome V MoloneyAbstract:A microscopic study of mode-locked pulse generation is presented for vertical external-cavity Surface-Emitting Lasers utilizing type-II quantum well configurations. The coupled Maxwell semiconductor Bloch equations are solved numerically where the type-II carrier replenishment is modeled via suitably chosen reservoirs. Conditions for stable mode-locked pulses are identified allowing for pulses in the \unit[100]{fs} range. Design strategies for type-II configurations are proposed that avoid potentially unstable pulse dynamics.
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on the measurement of the thermal impedance in vertical external cavity Surface Emitting Lasers
Journal of Applied Physics, 2013Co-Authors: Jorg Hader, T L Wang, Bernd Heinen, B Kunert, Stephan W Koch, Jerome V Moloney, Martin Koch, W StolzAbstract:A detailed and systematic analysis of the loss mechanisms in vertical-external-cavity Surface-Emitting Lasers is presented with the goal to correctly determine the amount of pump power that is converted to heat. With this input, the accuracy of a recently proposed method for measuring the thermal impedance based on roll-over characteristics is shown to be very high for devices with and without dielectric coating. Potential errors arising from non-heating losses can be determined by performing experiments with different out-coupling mirrors.
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quantum design strategy pushes high power vertical external cavity Surface Emitting Lasers beyond 100 w
Laser & Photonics Reviews, 2012Co-Authors: T L Wang, Bernd Heinen, Jorg Hader, C Dineen, Mino Sparenberg, Antje Weber, B Kunert, Stephan W Koch, Jerome V Moloney, Martin KochAbstract:Combining rigorous quantum epitaxial design, highly accurate growth, novel processing and thermal management pushes the output power of single chip vertical-external-cavity Surface-Emitting Lasers (VECSELs) beyond the 100 W milestone.
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grating based wavelength control of single and two color vertical external cavity Surface Emitting Lasers
Optics Letters, 2012Co-Authors: Maik Scheller, Stephan W Koch, Jerome V MoloneyAbstract:Wide wavelength tunability of single- and two-color operating vertical-external-cavity-Surface-Emitting Lasers (VECSELs) is demonstrated. Employing an external feedback based on a diffractive grating outside the cavity of a narrow-line single-color VECSEL allows for a continuous tuning of the emission wavelength over 10 nm. Employing a dual-feedback-configuration for tunable two-color emission, a tunability of the difference frequency between the two lasing wavelengths from 300 gigahertz to up to 3.5 terahertz is demonstrated.
Stephan W Koch - One of the best experts on this subject based on the ideXlab platform.
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mode locking in vertical external cavity Surface Emitting Lasers with type ii quantum well configurations
Applied Physics Letters, 2019Co-Authors: I Kilen, Jorg Hader, Stephan W Koch, Jerome V MoloneyAbstract:A microscopic study of mode-locked pulse generation is presented for vertical external-cavity Surface-Emitting Lasers utilizing type-II quantum well configurations. The coupled Maxwell semiconductor Bloch equations are solved numerically where the type-II carrier replenishment is modeled via suitably chosen reservoirs. Conditions for stable mode-locked pulses are identified allowing for pulses in the 100 fs range. Design strategies for type-II configurations are proposed that avoid potentially unstable pulse dynamics.A microscopic study of mode-locked pulse generation is presented for vertical external-cavity Surface-Emitting Lasers utilizing type-II quantum well configurations. The coupled Maxwell semiconductor Bloch equations are solved numerically where the type-II carrier replenishment is modeled via suitably chosen reservoirs. Conditions for stable mode-locked pulses are identified allowing for pulses in the 100 fs range. Design strategies for type-II configurations are proposed that avoid potentially unstable pulse dynamics.
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mode locking in vertical external cavity Surface Emitting Lasers with type ii quantum well configurations
arXiv: Optics, 2019Co-Authors: I Kilen, Jorg Hader, Stephan W Koch, Jerome V MoloneyAbstract:A microscopic study of mode-locked pulse generation is presented for vertical external-cavity Surface-Emitting Lasers utilizing type-II quantum well configurations. The coupled Maxwell semiconductor Bloch equations are solved numerically where the type-II carrier replenishment is modeled via suitably chosen reservoirs. Conditions for stable mode-locked pulses are identified allowing for pulses in the \unit[100]{fs} range. Design strategies for type-II configurations are proposed that avoid potentially unstable pulse dynamics.
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on the measurement of the thermal impedance in vertical external cavity Surface Emitting Lasers
Journal of Applied Physics, 2013Co-Authors: Jorg Hader, T L Wang, Bernd Heinen, B Kunert, Stephan W Koch, Jerome V Moloney, Martin Koch, W StolzAbstract:A detailed and systematic analysis of the loss mechanisms in vertical-external-cavity Surface-Emitting Lasers is presented with the goal to correctly determine the amount of pump power that is converted to heat. With this input, the accuracy of a recently proposed method for measuring the thermal impedance based on roll-over characteristics is shown to be very high for devices with and without dielectric coating. Potential errors arising from non-heating losses can be determined by performing experiments with different out-coupling mirrors.
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quantum design strategy pushes high power vertical external cavity Surface Emitting Lasers beyond 100 w
Laser & Photonics Reviews, 2012Co-Authors: T L Wang, Bernd Heinen, Jorg Hader, C Dineen, Mino Sparenberg, Antje Weber, B Kunert, Stephan W Koch, Jerome V Moloney, Martin KochAbstract:Combining rigorous quantum epitaxial design, highly accurate growth, novel processing and thermal management pushes the output power of single chip vertical-external-cavity Surface-Emitting Lasers (VECSELs) beyond the 100 W milestone.
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grating based wavelength control of single and two color vertical external cavity Surface Emitting Lasers
Optics Letters, 2012Co-Authors: Maik Scheller, Stephan W Koch, Jerome V MoloneyAbstract:Wide wavelength tunability of single- and two-color operating vertical-external-cavity-Surface-Emitting Lasers (VECSELs) is demonstrated. Employing an external feedback based on a diffractive grating outside the cavity of a narrow-line single-color VECSEL allows for a continuous tuning of the emission wavelength over 10 nm. Employing a dual-feedback-configuration for tunable two-color emission, a tunability of the difference frequency between the two lasing wavelengths from 300 gigahertz to up to 3.5 terahertz is demonstrated.
Joshua D. Sulkin - One of the best experts on this subject based on the ideXlab platform.
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single mode photonic crystal vertical cavity Surface Emitting Lasers
Advances in Optical Technologies, 2012Co-Authors: Kent D. Choquette, Paul O. Leisher, Joshua D. Sulkin, Dominic F. Siriani, J J Raftery, Ansas Matthias Kasten, Aaron James DannerAbstract:We review the design, fabrication, and performance of photonic crystal vertical cavity Surface Emitting Lasers (VCSELs). Using a periodic pattern of etched holes in the top facet of the VCSEL, the optical cavity can be designed to support the fundamental mode only. The electrical confinement is independently defined by proton implantation or oxide confinement. By control of the refractive index and loss created by the photonic crystal, operation in the Gaussian mode can be insured, independent of the lasing wavelength.
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mode control in photonic crystal vertical cavity Surface Emitting Lasers and coherent arrays
IEEE Journal of Selected Topics in Quantum Electronics, 2009Co-Authors: Dominic F. Siriani, Paul O. Leisher, Joshua D. Sulkin, J J Raftery, Aaron James Danner, Ansas Matthias Kasten, A C L Harren, Antonios V Giannopoulos, Kent D. ChoquetteAbstract:We demonstrate transverse mode control in vertical-cavity Surface-Emitting Lasers (VCSELs) and 2-D VCSEL arrays. By etching a periodic arrangement of circular holes into the top distributed Bragg reflector mirror, we are able to control the lasing modes through index and loss confinement. Theoretical modeling of these confinement effects are shown to be consistent with experimental measurements. Photonic crystal etched patterns and ion-implanted photonic lattices have been employed to fabricate coherently-coupled 2-D arrays. Control of the array supermodes from the out-of-phase and in-phase conditions is discussed. Designs of photonic crystal coherent VCSEL arrays for high-power emission and beam steering applications are described.
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manufacturable photonic crystal single mode and fluidic vertical cavity Surface Emitting Lasers
IEEE Journal of Selected Topics in Quantum Electronics, 2008Co-Authors: Ansas Matthias Kasten, Paul O. Leisher, Joshua D. Sulkin, David K Mcelfresh, D Vacar, Kent D. ChoquetteAbstract:We describe a robust manufacturing process for single-mode photonic crystal (PhC) vertical-cavity Surface-Emitting Lasers (VCSELs). Various PhC designs are investigated to determine endlessly single-mode designs, whereby the same PhC design yields single-mode operation for three different wavelengths (780, 850, and 980 nm). The fabrication of the PhC pattern is based on a self-aligned optical lithography process. The fabrication process results in VCSELs with a maximum output power greater than 1 mW under continuous-wave (CW) operation with side-mode suppression ratio greater than 35 dB. We also show microfluidic laser structures that are enabled by our fabrication process, which integrate fluid channels into VCSELs. Optical and electrical properties of these microfluidic VCSELs are investigated with and without fluids present under CW and pulsed operation. A shift of the lasing wavelength is found with fluid insertion.
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Parametric Study of Proton-Implanted Photonic Crystal Vertical-Cavity Surface-Emitting Lasers
IEEE Journal of Selected Topics in Quantum Electronics, 2007Co-Authors: Paul O. Leisher, Joshua D. SulkinAbstract:Photonic crystals with single- and seven-point defects are used to achieve single-fundamental-mode operation of proton-implanted vertical-cavity Surface-Emitting Lasers. The holes are etched at a variety of depths for various photonic crystal designs to investigate the influence on single-mode emission. Because proton-implantation provides weak transverse confinement in the form of thermal lensing, selective loss is not required to suppress lasing of extended photonic crystal modes. We show that etching the photonic crystals to shallow depths provides the ability to scale to large aperture sizes, while etching deeply allows single-mode emission of small diameter devices. Optimized designs exhibit a net reduction in loss relative to unetched control devices, as evidenced by a reduction in device threshold current.
