Diode Pumped Alkali Vapor Lasers - A New Pathway to High Beam Quality at High Average Power - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Diode Pumped Alkali Vapor Lasers - A New Pathway to High Beam Quality at High Average Power write by . This book was released on 2005. Diode Pumped Alkali Vapor Lasers - A New Pathway to High Beam Quality at High Average Power available in PDF, EPUB and Kindle. 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.
High-Power Diode Lasers
High-Power Diode Lasers - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook High-Power Diode Lasers write by Roland Diehl. This book was released on 2003-07-01. High-Power Diode Lasers available in PDF, EPUB and Kindle. 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.
New Class of CW High-Power Diode-Pumped Alkali Lasers (DPALs).
New Class of CW High-Power Diode-Pumped Alkali Lasers (DPALs). - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook New Class of CW High-Power Diode-Pumped Alkali Lasers (DPALs). write by S. A. Payne. This book was released on 2004. New Class of CW High-Power Diode-Pumped Alkali Lasers (DPALs). available in PDF, EPUB and Kindle. 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
High Power Diode Lasers - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook High Power Diode Lasers write by Friedrich Bachmann. This book was released on 2007-05-26. High Power Diode Lasers available in PDF, EPUB and Kindle. 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.
Hydrocarbon-free Resonance Transition 795 Nm Rubidium Laser
Hydrocarbon-free Resonance Transition 795 Nm Rubidium Laser - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Hydrocarbon-free Resonance Transition 795 Nm Rubidium Laser write by Sheldon Shao Quan Wu. This book was released on 2009. Hydrocarbon-free Resonance Transition 795 Nm Rubidium Laser available in PDF, EPUB and Kindle. 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.
