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Showing 1 to 20 of 63 for “"Vertical-cavity surface-emitting lasers"”.
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Vertical cavity surface emitting lasers.
Vertical cavity surface emitting laser (VCSEL) structures have been grown by both metal-organic chemical vapour deposition (MOCVD) and molecular beam epitaxy (MBE). These incorporate 3 strained InGaAs / GaAs quantum wells placed resonantly in a two wavelength long optical cavity, formed between …
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Numerical Simulation of Vertical Cavity Surface Emitting Lasers
In response to the growing importance of vertical cavity surface emitting lasers (VCSELs), the semiconductor laser simulator Minilase has been extended to allow simulation of VCSEL devices. The fundamental physics of VCSELs are no different from the physics of other semiconductor lasers; however, …
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High-power single-mode vertical-cavity surface-emitting lasers
Since their invention in 1979, vertical-cavity surface-emitting lasers (VCSELs) have been the focus of many research efforts due to the wide applicability of so many of their features. Those that operate in the single-mode regime with sufficiently high power are of particular interest because of …
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Direct modulation of multimode vertical cavity surface emitting lasers
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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A Comprehensive Study of Hybrid Vertical -Cavity Surface -Emitting Lasers
The high frequency modulation response for hybrid VCSELs is measured and compared to the theoretical response of the VCSEL derived through small signal analysis, with good agreement. For the two single mode structure wafers measured, the VCSELs with the implant aperture located farther away from …
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Simulating the Modulation Response of Vertical -Cavity Surface -Emitting Lasers
… extended to simulate the dynamic response of vertical-cavity surface-emitting lasers (VCSELs). Various nonlinear gain effects due to carrier transport have been self-consistently accounted for by MINILASE and their important roles in the modulation response are studied and clarified. First, it …
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Static and Dynamic Properties of Vertical -Cavity Surface -Emitting Lasers
Fiber-induced optical feedback is studied by measuring the static properties of an oxide VCSEL as a function of fiber position and correlating the data to theoretical results using a vector mode-matching method which includes the fiber in the modelled structure. A novel method for estimating the …
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Thermal and Optical Simulations of Vertical Cavity Surface Emitting Lasers
… coupled electronic-thermal-optical simulator for vertical cavity surface emitting lasers (VCSELs). The lattice temperature model is derived based on carrier transport and the conservation of energy. A novel treatment is applied to model distributed Peltier heat at a heterojunction by use of a …
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Heterogeneously bonded vertical cavity surface emitting lasers and thermal modeling
… consist of different materials for the light emitting region and the substrate. In this dissertation, a post-fabrication bonding technique for integrating semiconductor vertical cavity surface emitting lasers (VCSELs) onto hybrid substrates is demonstrated. This approach provides flexibility …
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Simulating the modulation response of Vertical-Cavity Surface-Emitting lasers
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-23T19:47:36Z No. of bitstreams: 1 liu_yang.pdf: 1056599 bytes, checksum: 919cc5c334cfe8b016ad6c23a3dc7ad7 (MD5)
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Vertical-cavity surface-emitting lasers: computer-aided modal and polarization engineering
L'abstract è presente nell'allegato / the abstract is in the attachment
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Coherent laser arrays from bottom-surface vertical-cavity surface-emitting lasers
Vertical-cavity surface-emitting lasers (VCSELs) are among the best choices for high beam quality semiconductor lasers. By designing a VCSEL array for uniform current injection and having the output coupler on the substrate side of the laser cavity, the laser will more easily operate in the …
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Proton-Implanted Photonic Crystal and Holey Vertical -Cavity Surface -Emitting Lasers
… fabricated in the top mirror of proton-implanted vertical-cavity surface-emitting laser (VCSEL) diodes to achieve single-fundamental-mode operation. A model of the effective transverse index of refraction profile for both cases is presented. The holes are etched a variety of depths for various …
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Modeling of Vertical -Cavity Surface -Emitting Lasers and Comparison With Experiment
… with very large apertures, for which the cold-cavity resonant wave-lengths and losses are the same for all modes. This concept is used to design optimized structures for high-power single-mode operation.
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Modulation approaches of vertical-cavity surface-emitting lasers with mode control
Vertical-cavity surface-emitting lasers (VCSELs) are currently the most popular light source for short-haul optical data communication primarily due to their low cost and low operating power. To address the needs for improved data rate, power consumption, and device lifetime, various approaches of …
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Self-heating control of edge emitting and vertical cavity surface emitting lasers
… the control of self-heating of both edge emitting laser diodes and vertical cavity surface emitting lasers (VCSELs). For the 980nm high power edge emitting laser, asymmetric waveguide is used for low free carrier absorption loss. The waveguide and cladding materials are optimized for high …
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Glucose monitoring measuring blood glucose using vertical cavity surface emitting lasers (VCSELs)
… for which the use of thermally tunable vertical cavity surface emitting lasers (VCSELs) as the light source to obtain blood absorption spectra, along with a multivariate technique (Partial Least Square (PLS) techniques) for analysis, is proposed. VCSELs are semiconductor lasers with …
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Vertical -Cavity Surface -Emitting Lasers Operating in Photonic Crystal Waveguide Defect Modes
Single mode operation in vertical cavity surface-emitting lasers is important for sensing and communications applications. A comprehensive study of the use of a periodic array of etched circular holes in the top distributed Bragg reflector of a vertical cavity surface-emitting laser to achieve …
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Vertical Cavity Surface-Emitting Lasers Operating With Multiple Photonic Crystal Defect Cavities
Coherently coupled arrays of vertical cavity surface emitting lasers (VCSELs) offer the potential of extended area coherent sources with high spectral purity, useful in a variety of applications in the high power (laser radar, optical communications, steerable sources) and low power (image …
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Optical loss and high-speed modulation of vertical-cavity surface-emitting lasers
Vertical-cavity surface-emitting lasers (VCSELs) are microcavity semiconductor lasers used extensively as the light source of short-haul optical data communication and optical interconnects. By increasing the efficiency and modulation speed of these devices, it will be possible to continue to meet …
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