Compact High Power Multi Spectral Mid Infrared Semiconductor Laser Package PDF Download
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Total Pages | : 72 |
Release | : 2001 |
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Download Compact, High Power, Multi-Spectral Mid-Infrared Semiconductor Laser Package Book in PDF, ePub and Kindle
Through a vertically integrated effort involving atomic level material engineering, advanced device processing development, state-of-the-art optomechanical packaging, and thermal management, Applied Optoelectronics, Inc. (AOI), University of Houston (U H), and Physical Science, Inc. (PSI) have made progress in both Sb-based type-II semiconductor material and in P-based type-I laser device development. We have achieved record performance on inP based quantum cascade continuous wave (CW) laser (with more than 5 mW CW power at 210 K). Grating-coupled external-cavity quantum cascade lasers were studied for temperatures from 20 to 230 K.A tuning range of 88 nm has been obtained at 80 K. The technology can be made commercially available and represents a significant milestone with regard to the Dual Use Science and Technology (DUST) intention of fostering dual use commercial technology for defense need. AOI is the first commercial company to ship products of this licensed technology.
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Total Pages | : 22 |
Release | : 2001 |
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Download Compact Optically Pumped High Power Midwave IR Lasers Book in PDF, ePub and Kindle
We have proposed a novel packaging scheme for high-power optically pumped mid-wave infrared lasers. The proposed device module does not require optics for alignment and is very compact in size. The module is made from copper and allows the pump laser to be moved relative to the mid-wave infrared laser by adjusting set-screws. Room temperature Fourier transform infrared spectroscopy measurements have been performed to measure the electroluminescence spectrum of the optically pumped mid-wave infrared laser which emits at 3.08 micrometers at room temperature. The best results were obtained at 77 K where we observe weak electroluminescence at approximately 2.7 micrometers. The optical pumping wavelength is 0.809 micrometers with a current of 10 A and 6 W of optical power.
Author | : Andreas Jechow |
Publisher | : Universitätsverlag Potsdam |
Total Pages | : 152 |
Release | : 2009 |
Genre | : Science |
ISBN | : 3869560312 |
Download Tailoring the Emission of Stripe-array Diode Lasers with External Cavities to Enable Nonlinear Frequency Conversion Book in PDF, ePub and Kindle
A huge number of applications require coherent radiation in the visible spectral range. Since diode lasers are very compact and efficient light sources, there exists a great interest to cover these applications with diode laser emission. Despite modern band gap engineering not all wavelengths can be accessed with diode laser radiation. Especially in the visible spectral range between 480 nm and 630 nm no emission from diode lasers is available, yet. Nonlinear frequency conversion of near-infrared radiation is a common way to generate coherent emission in the visible spectral range. However, radiation with extraordinary spatial temporal and spectral quality is required to pump frequency conversion. Broad area (BA) diode lasers are reliable high power light sources in the near-infrared spectral range. They belong to the most efficient coherent light sources with electro-optical efficiencies of more than 70%. Standard BA lasers are not suitable as pump lasers for frequency conversion because of their poor beam quality and spectral properties. For this purpose, tapered lasers and diode lasers with Bragg gratings are utilized. However, these new diode laser structures demand for additional manufacturing and assembling steps that makes their processing challenging and expensive. An alternative to BA diode lasers is the stripe-array architecture. The emitting area of a stripe-array diode laser is comparable to a BA device and the manufacturing of these arrays requires only one additional process step. Such a stripe-array consists of several narrow striped emitters realized with close proximity. Due to the overlap of the fields of neighboring emitters or the presence of leaky waves, a strong coupling between the emitters exists. As a consequence, the emission of such an array is characterized by a so called supermode. However, for the free running stripe-array mode competition between several supermodes occurs because of the lack of wavelength stabilization. This leads to power fluctuations, spectral instabilities and poor beam quality. Thus, it was necessary to study the emission properties of those stripe-arrays to find new concepts to realize an external synchronization of the emitters. The aim was to achieve stable longitudinal and transversal single mode operation with high output powers giving a brightness sufficient for efficient nonlinear frequency conversion. For this purpose a comprehensive analysis of the stripe-array devices was done here. The physical effects that are the origin of the emission characteristics were investigated theoretically and experimentally. In this context numerical models could be verified and extended. A good agreement between simulation and experiment was observed. One way to stabilize a specific supermode of an array is to operate it in an external cavity. Based on mathematical simulations and experimental work, it was possible to design novel external cavities to select a specific supermode and stabilize all emitters of the array at the same wavelength. This resulted in stable emission with 1 W output power, a narrow bandwidth in the range of 2 MHz and a very good beam quality with M²<1.5. This is a new level of brightness and brilliance compared to other BA and stripe-array diode laser systems. The emission from this external cavity diode laser (ECDL) satisfied the requirements for nonlinear frequency conversion. Furthermore, a huge improvement to existing concepts was made. In the next step newly available periodically poled crystals were used for second harmonic generation (SHG) in single pass setups. With the stripe-array ECDL as pump source, more than 140 mW of coherent radiation at 488 nm could be generated with a very high opto-optical conversion efficiency. The generated blue light had very good transversal and longitudinal properties and could be used to generate biphotons by parametric down-conversion. This was feasible because of the improvement made with the infrared stripe-array diode lasers due to the development of new physical concepts.
Author | : Peter E. Andersen |
Publisher | : Institution of Engineering and Technology |
Total Pages | : 472 |
Release | : 2018-10 |
Genre | : Technology & Engineering |
ISBN | : 1785612727 |
Download Semiconductor Lasers and Diode-based Light Sources for Biophotonics Book in PDF, ePub and Kindle
Semiconductor lasers are small, reliable, low cost, high-performance and user-friendly optical devices which make them highly suitable for a variety of biomedical applications. This edited book gathers experts in the field to cover the fundamentals and technology advances of semiconductor lasers and diode-based lasers with a focus on their applications in medical optics and biophotonics including edge-emitting semiconductor lasers and light emitting diodes, Q-switched and mode-locked lasers, quantum cascade lasers, semiconductor disk lasers, near-infrared spectroscopy systems for biomedical applications, bio-medical Raman spectroscopy, nonlinear imaging and optical coherence tomography.
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Total Pages | : 1286 |
Release | : 2006 |
Genre | : Technology |
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Download NASA Tech Briefs Book in PDF, ePub and Kindle
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Total Pages | : 702 |
Release | : 1995 |
Genre | : Aeronautics |
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Download Scientific and Technical Aerospace Reports Book in PDF, ePub and Kindle
Author | : A. Miller |
Publisher | : CRC Press |
Total Pages | : 494 |
Release | : 2020-12-17 |
Genre | : Science |
ISBN | : 1000111288 |
Download Semiconductor Quantum Optoelectronics Book in PDF, ePub and Kindle
The development and application of low-dimensional semiconductors have been rapid and spectacular during the past decade. Ever improving epitaxial growth and device fabrication techniques have allowed access to some remarkable new physics in quantum confined structures while a plethora of new devices has emerged. The field of optoelectronics in particular has benefited from these advances both in terms of improved performance and the invention of fundamentally new types of device, at a time when the use of optics and lasers in telecommunications, broadcasting, the Internet, signal processing, and computing has been rapidly expanding. An appreciation of the physics of quantum and dynamic electronic processes in confined structures is key to the understanding of many of the latest devices and their continued development. Semiconductor Quantum Optoelectronics covers new physics and the latest device developments in low-dimensional semiconductors. It allows those who already have some familiarity with semiconductor physics and devices to broaden and expand their knowledge into new and expanding topics in low-dimensional semiconductors. The book provides pedagogical coverage of selected areas of new and pertinent physics of low-dimensional structures and presents some optoelectronic devices presently under development. Coverage includes material and band structure issues and the physics of ultrafast, nonlinear, coherent, intersubband, and intracavity phenomena. The book emphasizes various devices, including quantum wells, visible, quantum cascade, and mode-locked lasers; microcavity LEDs and VCSELs; and detectors and logic elements. An underlying theme is high-speed phenomena and devices for increased system bandwidths.
Author | : Laszlo Nemes |
Publisher | : World Scientific |
Total Pages | : 536 |
Release | : 2011 |
Genre | : Science |
ISBN | : 9812837647 |
Download Spectroscopy, Dynamics and Molecular Theory of Carbon Plasmas and Vapors Book in PDF, ePub and Kindle
This book is a stop-gap contribution to the science and technology of carbon plasmas and carbon vapors. It strives to cover two strongly related fields: the molecular quantum theory of carbon plasmas and carbon nanostructures; and the molecular and atomic spectroscopy of such plasmas and vapors. These two fields of research are strongly intertwined and thus reinforce one another.Even though the use of carbon nanostructures is increasing by the day and their practical uses are emerging, there is no modern review on carbon plasmas, especially from molecular theoretical and spectroscopic viewpoints. The importance of the present book is therefore great from both educational and practical aspects. This review might be the first step towards bringing such textbooks into existence for university education. Similarly, for applied and engineering works in carbon nanostructures, the book provides a theoretical salient point for technologists in the field.
Author | : Wenfeng Xia |
Publisher | : Springer Nature |
Total Pages | : 608 |
Release | : |
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ISBN | : 3031614119 |
Download Biomedical Photoacoustics Book in PDF, ePub and Kindle
Author | : United States. Congress. Senate. Committee on Armed Services |
Publisher | : |
Total Pages | : 1156 |
Release | : 2008 |
Genre | : United States |
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Download Department of Defense Authorization for Appropriations for Fiscal Year 2008 Book in PDF, ePub and Kindle