Diode Pumped Alkali Vapor Lasers A New Pathway To High Beam Quality At High Average Power
DOWNLOAD
Download Diode Pumped Alkali Vapor Lasers A New Pathway To High Beam Quality At High Average Power PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Diode Pumped Alkali Vapor Lasers A New Pathway To High Beam Quality At High Average Power book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Diode Pumped Alkali Vapor Lasers A New Pathway To High Beam Quality At High Average Power
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2005
Diode Pumped Alkali Vapor Lasers A New Pathway To High Beam Quality At High Average Power written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Resonance-transition alkali-vapor lasers have only recently been demonstrated [1] but are already attracting considerable attention. Alkali-atom-vapor gain media are among the simplest possible systems known, so there is much laboratory data upon which to base performance predictions. Therefore, accurate modeling is possible, as shown by the zero- free-parameter fits [2] to experimental data on alkali-vapor lasers pumped with Ti:sapphire lasers. The practical advantages of two of the alkali systems--Rb and Cs--are enormous, since they are amenable to diode-pumping [3,4]. Even without circulating the gas mixture, these lasers can have adequate cooling built-in owing to the presence of He in their vapor cells. The high predicted (up to 70%) optical-to-optical efficiency of the alkali laser, the superb (potentially 70% or better) wall-plug efficiency of the diode pumps, and the ability to exhaust heat at high temperature (100 C) combine to give a power-scalable architecture that is lightweight. A recent design exercise [5] at LLNL estimated that the system ''weight-to-power ratio'' figure of merit could be on the order of 7 kg/kW, an unprecedented value for a laser of the 100 kW class. Beam quality is expected to be excellent, owing to the small dn/dT value of the gain medium. There is obviously a long way to go, to get from a small laser pumped with a Ti:sapphire or injection-seeded diode system (of near-perfect beam quality, and narrow linewidth) [1, 4] to a large system pumped with broadband, multimode diode- laser arrays. We have a vision for this technology-development program, and have already built diode-array-pumped Rb lasers at the 1 Watt level. A setup for demonstrating Diode-array-Pumped Alkali vapor Lasers (DPALs) is shown in Figure 1. In general, use of a highly-multimode, broadband pump source renders diode-array-based experiments much more difficult than the previous ones done with Ti:sapphire pumping. High-NA optics, short focal distances, and short vapor cells are needed.
New Class Of Cw High Power Diode Pumped Alkali Lasers Dpals
DOWNLOAD
Author : S. A. Payne
language : en
Publisher:
Release Date : 2004
New Class Of Cw High Power Diode Pumped Alkali Lasers Dpals written by S. A. Payne and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
The new class of diode-pumped alkali vapor lasers (DPALs) offers high efficiency cw laser radiation at near-infrared wavelengths: cesium 895 nm, rubidium 795 nm, and potassium 770 nm. The working physical principles of DPALs will be presented. Initial 795 nm Rb and 895 nm Cs laser experiments performed using a titanium sapphire laser as a surrogate pump source demonstrated DPAL slope power conversion efficiencies in the 50-70% range, in excellent agreement with device models utilizing only literature spectroscopic and kinetic data. Using these benchmarked models for Rb and Cs, optimized DPALs with optical-optical efficiencies>60%, and electrical efficiencies of 25-30% are projected. DPAL device architectures for near-diffraction-limited power scaling into the high kilowatt power regime from a single aperture will be described. DPAL wavelengths of operation offer ideal matches to silicon and gallium arsenide based photovoltaic power conversion cells for efficient power beaming.
High Power Diode Lasers
DOWNLOAD
Author : Roland Diehl
language : en
Publisher: Springer Science & Business Media
Release Date : 2003-07-01
High Power Diode Lasers written by Roland Diehl and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-07-01 with Science categories.
Starting from the basics of semiconductor lasers with emphasis on the generation of high optical output power the reader is introduced in a tutorial way to all key technologies required to fabricate high-power diode-laser sources. Various applications are exemplified.
Hydrocarbon Free Resonance Transition 795 Nm Rubidium Laser
DOWNLOAD
Author : Sheldon Shao Quan Wu
language : en
Publisher:
Release Date : 2009
Hydrocarbon Free Resonance Transition 795 Nm Rubidium Laser written by Sheldon Shao Quan Wu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Resonance transition rubidium laser operating on the 52P1/2[right arrow]521/2 transition with a hydrocarbon-free buffer gas is described. An extensive conceptual and numerical modeling study of the hydrocarbon-free rubidium laser is conducted. Prior demonstrations of alkali resonance transition lasers have used ethane as either the buffer gas or a buffer gas component to promote rapid fine-structure mixing. Evidence suggests that the alkali vapor reacts with the ethane producing carbon as one of the reaction products. This degrades long term laser reliability. Our experimental results with a "clean" helium-only buffer gas system pumped by a Ti:sapphire laser demonstrate all the advantages of the alkali laser, but without the reliability issues associated with the use of ethane. We further report a demonstration of a rubidium laser using a buffer gas consisting of pure 3He. Using isotopically enriched 3He gas yields enhanced mixing of the Rb fine-structure levels. This enables efficient lasing at reduced He buffer gas pressure, improved thermal management in high average power Rb lasers and enhanced power scaling potential of such systems. A diode-pumped alkali laser with output power of 150 W is demonstrated using commercial diode pump arrays with linewidths of ~0.5 nm, a regime requiring only modest linewidth control. We anticipate that this approach presents a new pathway to high average power lasers with good beam quality and high efficiency. Furthermore, collisional energy transfer leading to the ionization of active atoms is observed in an optically pumped Rb laser. Using a chopped Ti:sapphire laser as a pump source, their effects on the Rb laser are studied. A simple model is presented with numerical parameters gathered from published literature to explain our observations. Although these parasitic processes can strongly affect laser output, they do not appear to significantly impact the overall laser efficiency in the regime examined in this study.
High Power Diode Lasers
DOWNLOAD
Author : Friedrich Bachmann
language : en
Publisher: Springer
Release Date : 2007-05-26
High Power Diode Lasers written by Friedrich Bachmann and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-05-26 with Science categories.
This book summarizes a five year research project, as well as subsequent results regarding high power diode laser systems and their application in materials processing. The text explores the entire chain of technology, from the semiconductor technology, through cooling mounting and assembly, beam shaping and system technology, to applications in the processing of such materials as metals and polymers. Includes theoretical models, a range of important parameters and practical tips.
Diode Pumped High Energy And High Power Lasers Eli
DOWNLOAD
Author : Joachim Hein
language : en
Publisher: SPIE-International Society for Optical Engineering
Release Date : 2011
Diode Pumped High Energy And High Power Lasers Eli written by Joachim Hein and has been published by SPIE-International Society for Optical Engineering this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with High power lasers categories.
Includes Proceedings Vol. 7821
Advances In High Power Fiber And Diode Laser Engineering
DOWNLOAD
Author : Ivan Divliansky
language : en
Publisher: Institution of Engineering and Technology
Release Date : 2019-12-30
Advances In High Power Fiber And Diode Laser Engineering written by Ivan Divliansky and has been published by Institution of Engineering and Technology this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-12-30 with Technology & Engineering categories.
Advances in High-Power Fiber and Diode Laser Engineering provides an overview of recent research trends in fiber and diode lasers and laser systems engineering. In recent years, many new fiber designs and fiber laser system strategies have emerged, targeting the mitigation of different problems which occur when standard optical fibers are used for making high-power lasers. Simultaneously, a lot of attention has been put to increasing the brightness and the output power of laser diodes. Both of these major laser development directions continue to advance at a rapid pace with the sole purpose of achieving higher power while having excellent beam quality. The book begins by introducing the principles of diode lasers and methods for improving their brightness. Later chapters cover quantum cascade lasers, diode pumped high power lasers, high average power LMA fiber amplifiers, high-power fiber lasers, beam combinable kilowatt all-fiber amplifiers, and applications of 2 μm thulium fiber lasers and high-power GHz linewidth diode lasers. Written by a team of authors with experience in academia and industrial research and development, and brought together by an expert editor, this book will be of use to anyone interested in laser systems development at the laboratory or commercial scale.
Dpal
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2003
Dpal written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
The new class of diode pumped alkali vapor lasers (DPALs) offers high efficiency cw laser beams at wavelengths which efficiently couple to photovoltaic (PV) cells: silicon cells at 895 nm (cesium), and GaAs cells at 795 nm (rubidium) and at 770 nm (potassium). DPAL electrical efficiencies of 25-30% are projected, enabling PV cell efficiencies (almost equal to)40% (Si) and (almost equal to)60% (GaAs). Near-diffraction-limited DPAL device power scaling into the multi-kilowatt regime from a single aperture is projected.
Atomic Alkali Lasers Pumped By The Dissociation Of Photoexcited Alkali Rare Gas Collision Pairs
DOWNLOAD
Author : Jason D. Readle
language : en
Publisher:
Release Date : 2010
Atomic Alkali Lasers Pumped By The Dissociation Of Photoexcited Alkali Rare Gas Collision Pairs written by Jason D. Readle and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
A new class of photoassociation lasers has been demonstrated in which photoexcited alkali-rare gas collision pairs dissociate in order to produce inversion on atomic alkali transitions. The pump acceptance bandwidths of these excimer bands, historically referred to as spectral satellites, have been observed to be as broad as 5 nm. This characteristic makes excimer-pumped alkali-vapor lasers (XPALs) attractive candidates for the spatial mode conversion of laser diode arrays with nominal linewidths of 2 nm in order to produce high quality (M2 1) beams. Quantum e ciencies exceeding 98% have been measured and may potentially mitigate heat extraction issues associated with high power, large volume lasers. XPALs operating on both the n2P1=2 ! n2S1=2 (D1) or n2P3=2 ! n2S1=2 (D2) transitions of Cs (n = 6) and Rb (n = 5) have been experimentally investigated and show promise for scaling to high power, diode pumped systems. Both semiclassical and quantum mechanical formulations of the free!free transitions which produce satellites are presented, culminating in an improved CsAr(B2 + 1=2) potential. A timedependent rate equation model is also described which clearly shows the validity and utility of employing the laser itself as a sensitive probe of the underlying photoassociation kinetics.
Diode Pumped Alkali Vapor Fiber Laser
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2006
Diode Pumped Alkali Vapor Fiber Laser written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
A method and apparatus is provided for producing near-diffraction-limited laser light, or amplifying near-diffraction-limited light, in diode pumped alkali vapor photonic-band-gap fiber lasers or amplifiers. Laser light is both substantially generated and propagated in an alkali gas instead of a solid, allowing the nonlinear and damage limitations of conventional solid core fibers to be circumvented. Alkali vapor is introduced into the center hole of a photonic-band-gap fiber, which can then be pumped with light from a pump laser and operated as an oscillator with a seed beam, or can be configured as an amplifier.