Download or read book Integrated Surface Emitting Laser Arrays with Flat Tip Microprohes for the Near Field Optical Data Storage written by Young J. Kim and published by . This book was released on 2001 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current optical data storage is challenging to increase its memory capacity and data transfer rate for realizing high-quality image and rapid service in the coming digital, multimedia and network era. To actualize more effective and simple data storage, a novel parallel near-field optical system has been proposed using vertical cavity surface emitting laser (VCSEL) microprobe arrays. The new parallel optical system is based a multibeam recording head consisting of a VCSEL array with apertures of nanometer size as a near-field wave exit. We have developed some candidates for the parallel recording head, including the direct aperture formation on the VCSEL emitting surface and the preparation of microprobe arrays with flat-tip structure. The new flat-tip microprobe array has advantages for improving the optical efficiency and stabilizing the contact head system with optical media since it is prepared from semiconductor materials of high refractive index. Silicon nano-aperture probe array has been prepared successfully with the aperture size of 150 to 500 nm using micro-fabrication techniques. We have also investigated the integrated microprobe array by the direct fabrication of flat-tip probes on the substrate of bottom emitting VCSEL arrays. Finally the reading mechanism has been studied theoretically using a finite difference time domain (FDTD) simulation and an optical feedback effect of semiconductor lasers for the integrated microprobe VCSEL array. We believe this nano-aperture VCSEL probe array is sufficiently effective to be applied to the parallel recording head for the near-field optical data storage of a high data capacity and fast transfer rate.

Download or read book Low Power Vertical Cavity Laser Arrays with Integrated Microlenses for Free Space Interconnects Phase 1 written by and published by . This book was released on 1996 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vertical cavity surface emitting lasers are ideally suited for high performance and low cost data transmission systems. Recent advances have yielded devices with low power efficiencies far greater than for in plane lasers. This means that it is now possible to produce massively parallel two dimensional emitter arrays with acceptable heat generation. The low divergence circular optical emission enables the devices to be designed into low cost free space communication systems. Adding to the device characteristics has been the development of GaAs microlenses integrated directly into the substrate of bottom emitting Vertical Cavity Surface Emitting Lasers. These microlenses are used to collimate the emission from the lasers. This same microlens technology can also be adapted to InP based detector arrays for complete free space communications links.

Download or read book Vertical cavity Surface emitting Laser Arrays written by Jack L. Jewell and published by . This book was released on 1994 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Diode Laser Arrays written by Dan Botez and published by Cambridge University Press. This book was released on 2005-11-24 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive overview of the fundamental principles and applications of semiconductor diode laser arrays. All of the major types of arrays are discussed in detail, including coherent, incoherent, edge- and surface-emitting, horizontal- and vertical-cavity, individually addressed, lattice- matched and strained-layer systems. The initial chapters cover such topics as lasers, amplifiers, external-cavity control, theoretical modeling, and operational dynamics. Spatially incoherent arrays are then described in detail, and the uses of vertical-cavity surface emitter and edge-emitting arrays in parallel optical-signal processing and multi-channel optical recording are discussed. Researchers and graduate students in solid state physics and electrical engineering studying the properties and applications of such arrays will find this book invaluable.

Download or read book Development of Increased Reliability Vertical Cavity Surface Emitting Laser Arrays written by and published by . This book was released on 2005 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vertical Cavity Surface Emitting Lasers (VCSELs) should see increasing use for short distance optical interconnects in the next 5-10 years: data rate requirements will exceed 10 Gbit/second. It was shown in the proposal that at these data rates electrical current requirements on the VCSELs cause excessive failure rates due to current mitigated defect formation and thermal rise in the active region. Here the thermal rise is addressed through reduction of thermal impedance from the active region to the heat sink. For 40 Gbit/second VCSELs, a reduction of thermal impedance from 1500 C/W to 100 C/W will increase mean lifetime from minutes to years. We proposed to achieve this reduction via flip-chip bonding of the VCSEL, using solder bonding directly to the VCSEL's active area, in conjunction with a reduction of the associated mirror stack via incorporation of metal reflectors. We have achieved 500 C/W, albeit with increased failure rate at a given active region temperature due to bond stresses. This quandary of being able to reduce thermal impedance by bonding near the active region to provide a direct heat path, but at the same time increasing failure rate at a given temperature because of the mechanical stresses induced needs to be addressed in future work.

Download or read book Phase locked Arrays of Vertical cavity Surface emitting Lasers written by Mial E. Warren and published by . This book was released on 2005 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vertical Cavity Surface-Emitting Lasers (VCSELs) are of increasing interest to the photonics community because of their surface-emitting structure, simple fabrication and packaging, wafer-level testability and potential for low cost. Scaling VCSELs to higher power outputs requires increasing the device area, which leads to transverse mode control difficulties if devices become larger than 10-15 microns. One approach to increasing the device size while maintaining a well controlled transverse mode profile is to form coupled or phase-locked, two-dimensional arrays of VCSELs that are individually single-transverse mode. The authors have fabricated and characterized both photopumped and electrically injected two-dimensional VCSEL arrays with apertures over 100 microns wide. Their work has led to an increased understanding of these devices and they have developed new types of devices, including hybrid semiconductor/dielectric mirror VCSEL arrays, VCSEL arrays with etched trench, self-aligned, gold grid contacts and arrays with integrated phase-shifters to correct the far-field pattern.

Download or read book Analysis and Applications of Coupled Leaky mode Implant defined Surface emitting Laser Arrays written by Dominic F. Siriani and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Anti-guided vertical-cavity surface-emitting laser (VCSEL) arrays have been designed, fabricated, and characterized using a number of methods. Two-dimensional coherent arrays are useful for biological and atmospheric sensing, free-space and fiber-based optical links, high-power laser pumps, and optical imaging. Coherently coupled arrays exhibit desirable characteristics such as low beam divergence and high brightness. However, the fabrication procedures necessary for such designs are typically complicated and expensive. This work demonstrates and explores a new and much simpler anti-guided VCSEL array design using ion implantation and photonic crystal confinement. The origin of anti-guiding in these laser arrays is described in detail, and design rules for optimizing performance are discussed. A complete description of the means to achieve optical coupling in surface-emitting laser arrays, as well as the coherence in these arrays, is presented through both theoretical and experimental investigations. These lasers are shown to be capable of producing highly coherent, single-mode, in-phase output beams. The application of such arrays as low-divergence and steerable sources is demonstrated experimentally.

Download or read book Integrated Optical Phased Arrays written by Jelena Notaros and published by . This book was released on 2020 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrated optical phased arrays, fabricated in advanced silicon-photonics platforms, enable manipulation and dynamic control of free-space light in a compact form factor, at low costs, and in a non-mechanical way. As such, integrated optical phased arrays have emerged as a promising technology for many wide-reaching applications, including LiDAR sensors and augmented-reality displays. In this thesis, novel integrated-optical-phased-array devices, systems, results, and applications are presented. First, beam-steering optical phased arrays for LiDAR are shown, including the first beam-steering optical phased arrays powered by monolithically-integrated on-chip rare-earth-doped lasers, the first beam-steering optical phased arrays controlled using heterogeneously-integrated CMOS driving electronics, and the first single-chip coherent LiDAR with integrated optical phased arrays and CMOS receiver electronics. These demonstrations are important steps towards practical commercialization of low-cost and high-performance integrated LiDAR sensors for autonomous vehicles. Next, integrated optical phased arrays for optical manipulation in the near field are developed, including the first near-field-focusing integrated optical phased arrays, the first quasi-Bessel-beam-generating integrated optical phased arrays, and a novel active butterfly architecture for independent amplitude and phase control. These near-field modalities have the potential to advance a number of application areas, such as optical trapping for biological characterization, trapped-ion quantum computing, and laser-based 3D printing. Finally, a novel transparent integrated-phased-array-based holographic display is proposed as a highly-discreet and fully-holographic solution for the next generation of augmented-reality head-mounted displays; novel passive near-eye displays that generate holograms, the first integrated visible-light liquid-crystal-based phase and amplitude modulators, and the first actively-tunable visible-light integrated optical phased arrays are presented.

Download or read book Monolithic Multiple Wavelength Vertical cavity Surface emitting Laser Arrays and Resonance enhanced Photo detector Arrays for Optical Interconnects written by Gerardo G. Ortiz and published by . This book was released on 1997 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface Emitting Lasers for Integration written by K. Iga and published by . This book was released on 1992 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new field of optoelectronics including large capacity parallel lightwave communications, multi-access optical disks, optical computing, optical interconnects and so on, is accelerating the importance of surface emitting (SE) lasers. The research activity is now forwarded to monolithic integration of SE laser based optical circuits by taking the advantage of its small cavity dimension. The importance of 1.3 or 1.55 micrometer devices is currently increasing, since parallel lightwave systems and optical interconnects are actually considered. However, the GaInAsP/InP system has some substantial difficulties for making SE lasers due to the Auger recombination, intra-valence band absorption, the index difference between GaInAsP and InP is relatively small, and so on. Pulsed operation has been obtained at near room temperature, and room temperature. A polyimide buried structure device is fabricated by much simpler processes and pulsed operation at 66 deg C has been obtained. But, it is still difficult to operate CW at room temperature in this system.

Download or read book Multiple wavelength Vertical cavity Surface emitting Laser Arrays for High speed Local Area Networks written by Wu-Pen Yuen and published by . This book was released on 2000 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Integration of Diffractive Lenses with Addressable Vertical cavity Laser Arrays written by and published by . This book was released on 1995 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: An optical interconnection system is being developed to provide vertical, digital data channels for stacked multichip modules. A key component of the system is an array of individually addressable vertical-cavity surface-emitting lasers with diffractive lenses integrated into the substrate to control beam divergence and direction. The lenses were fabricated by direct-write e-beam lithography and reactive ion beam etching into the GaAs substrate. Preliminary device performance data and the design and fabrication issues are discussed.

Download or read book Characterization of Vertical Cavity Surface Emitting Lasers with Electrical and Optical Derivative Spectroscopy written by Brandon Matthew Stanton and published by . This book was released on 2003 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: Near-Field, Derivative, VCSELs.

Download or read book Modulation of Coherently Coupled Surface emitting Laser Arrays Analysis and Applications written by Stewart T. Fryslie and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wallboard and Wall Plaster except Gypsium Building Insulation and Floor Composition Manuf Corporations written by and published by . This book was released on 1942 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Integrated Optoelectronics Using Injection Locked Vertical Cavity Surface Emitting Lasers written by and published by . This book was released on 1997 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Final Report, describes experimental, analytical and numerical investigations of injection locking in a vertical cavity surface emitting laser for applications which benefit from optical control of microwaves. It concentrates on strong injection locking, where the imposition of the external optical signal not only locks the slave laser to the injected signal but also modifies the dynamic characteristics of the coupling between the optical field and the gain medium. This can lead to unstable dynamics in a vertical cavity surface emitting laser, or other semiconductor laser, and the optical output can consist principally of two frequency components. The frequency separation between these two components can be tuned across a broad range. We have found that a conventional coupled equation model identifies all of the key phenomena that we observe in our data. Our data shows the particular laser that we studied had a very strong noise spectra and a polarization instability which would have kept it from many optical control of microwaves applications. However, these features are not intrinsic to vertical cavity surface emitting lasers. The ability to generate a tunable modulation with controlled output characteristics using such a compact optical source is very attractive. Further studies are required.