Realizing A Mid Infrared Optically Pumped Molecular Gas Laser Inside Hollow Core Photonic Crystal Fiber
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Realizing A Mid Infrared Optically Pumped Molecular Gas Laser Inside Hollow Core Photonic Crystal Fiber
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Author : Andrew Michael Jones
language : en
Publisher:
Release Date : 2012
Realizing A Mid Infrared Optically Pumped Molecular Gas Laser Inside Hollow Core Photonic Crystal Fiber written by Andrew Michael Jones and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
This research has focused on the development, demonstration, and characterization of a new type of laser based on optically-pumped gases contained within hollow optical fibers. These novel lasers are appealing for a variety of applications including frequency metrology in the mid-infrared, free-space communications and imaging, and defense applications. Furthermore, because of the hollow core fibers used, this technology may provide the means to surpass the theoretical limits of output power available from high power solid-core fiber laser systems. Gas-filled hollow-core fiber lasers based on population inversion from acetylene (12C2H2) and hydrogen cyanide (HCN) gas contained within the core of a kagome-structured hollow-core photonic crystal fiber have now been demonstrated. The gases are optically pumped via first order rotational-vibrational overtones near 1.5 [mu]m using 1-ns duration pulses from a home-built optical parametric amplifier. Narrow-band laser emission peaks in the 3-[mu]m region corresponding to the [Delta][joule] = ±1 dipole allowed rotational transitions between the pumped vibrational overtone modes and the fundamental C-H stretching modes have been observed in both molecules. High gain resulting from tight confinement of the pump and laser light together with the active gas permits these lasers to operate in a single pass configuration, without the use of any external resonator structure. Studies of the generated mid-infrared pulse energy, threshold energy, and slope efficiency as functions of the launched pump pulse energy and gas pressure have been performed and show an optimum condition where the maximum laser pulse energy is achieved for a given fiber length. The laser pulse shape and the laser-to-pump pulse delay have been observed to change with varying pump pulse energy and gas pressure, resulting from the necessary population inversion being created in the gases at a specific fiber length dependent on the launched pulse energy. Work is on going to demonstrate the first continuous wave version of the laser which may be used to produce a single coherent output from many mutually incoherent pump sources.
Improved Performance Of An Optically Pumped Mid Infrared Acetylene Filled Hollow Core Fiber Laser
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Author : Neda Dadashzadeh
language : en
Publisher:
Release Date : 2017
Improved Performance Of An Optically Pumped Mid Infrared Acetylene Filled Hollow Core Fiber Laser written by Neda Dadashzadeh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
The focus of this research is improving the pulse output energy of a mid-IR pulsed acetylene-filled Hollow-core Optical Fiber Gas LASer (HOFGLAS) system. Pump pulses and acetylene molecules interact with each other inside hollow-core photonic crystal fiber that effectively confines light and allows for strong gain. This results in lasing at 3.11 [mu]m and 3.17 [mu]m lines based on population inversion of acetylene molecules, which are optically pumped at rotational-vibrational overtones near 1.5 [mu]m using 1 ns pulse duration from an optical parametric amplifier (OPA). This acetylene laser operates with no cavity mirrors because of a high gain in a single pass configuration. There are few laser sources in the mid-IR region while there are many applications for having a laser source in this range such as remote sensing, hazardous chemical detection, and breath analysis. This adds to the importance of the acetylene-filled HOFGLAS system. Some of the applications like remote sensing require high power. So, we moved toward power scaling this laser system by optimizing the laser operation through maximizing the OPA alignment to improve its modal content using longer length of fiber to increase the interaction length and improving the beam quality of the mid-IR emissions. The highest pulse energy ever obtained in the 3 [mu]m mid-IR region from the acetylene-filled HOFGLAS after applying the improvements is reported here (1.4 [mu]J). Higher mid-IR pulse energies can be achieved by improving the pulse energy achievable from the OPA pump source and working with longer pulse duration to decrease the bandwidth of the OPA. This operation demonstrates many novel properties of acetylene-filled pulsed mid-IR hollow-core fiber lasers. The excellent spatial beam quality at highest power and phenomenological scaling of saturation power and efficiency with pressure that we observe point to the promise of power scaling and motivate further development of numerical models of the laser for deeper insight into these effects. M2 measurement method was used to examine spatial beam quality and it was found to be fiber-dependent. For the improved setup, M2 was investigated at several input pump powers in addition to the reproducibility checks. M2 of 1.14 at the maximum output power motivates for beam combining to scale to higher power. The independence of efficiency on pressure is an evidence for reaching higher mid-IR power at a pressure where saturation behavior does not exist. achieving the highest mid-IR power to date, 1.4 [mu]J, encourages for building higher power OPA to produce high power mid-IR emissions. Taken as a whole, this laser exhibits novel behavior that motivates both numerical/theoretical investigation and further efforts to scale to higher powers.
Power Scaling And Mode Quality Of An Acetylene Mid Infrared Hollow Core Optical Fiber Gas Laser
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Author : Hewa Walpitage Kushan Madushanka Weerasinghe
language : en
Publisher:
Release Date : 2019
Power Scaling And Mode Quality Of An Acetylene Mid Infrared Hollow Core Optical Fiber Gas Laser written by Hewa Walpitage Kushan Madushanka Weerasinghe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
This thesis explores the power scalability and the mode quality of mid-IR acetylene filled Hollow-core Optical Fiber Gas LASer (HOFGLAS). The mid-IR lasing mechanism is based on the population inversion in acetylene molecules within the hollow-core of the hypocycloidal kagome structured fiber. The acetylene gas is optically pumped with 1 ns pulses near 1.5 μm using an optical parametric amplifier (OPA). The acetylene molecules absorb pump light via rotational-vibrational overtone transitions and can lase in 3 μm region through dipole allowed transitions. Since hollow-core fiber provides long interaction length and tight confinement for gas and light, higher gain is achieved by single pass configuration. In this work, the effect of fiber length, gas pressure, pump wavelength, and pump pulse duration on the mid-IR laser is experimentally studied in order to scale the laser system to higher mid-IR energies. By studying combinations of fiber length with different acetylene gas pressures, we were able to remove the laser signal saturations that have been observed in previous studies. Furthermore, the produced mid-IR laser energy linearly depends on the absorbed near-IR pump energy, and it is only limited by the available near-IR pump energy. Moreover, the highest mid-IR pulse energy of 2.56 μJ is measured when the acetylene filled HOFGLAS system is pumped via the P(9) line, which is the highest ever mid-IR pulse energy that has been measured to our knowledge. Mid-IR laser efficiency is independent of acetylene gas pressure and for the gas pressure region we worked on, a shorter pump pulse width is preferred. An experiment is designed and performed based on the M2 to study the beam quality of the produced mid-IR beam. The mid-IR laser output shows near diffraction-limited performance with an M2 value of 1.15. Finally, a numerical model based on the saturated absorption for inhomogeneous line profile is proposed to estimate the absorbed near-IR pump energy only by acetylene gas.
Hollow Core Optical Fbers
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Author : Walter Belardi
language : en
Publisher: MDPI
Release Date : 2019-07-29
Hollow Core Optical Fbers written by Walter Belardi and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-07-29 with Technology & Engineering categories.
This book is a printed edition of the Special Issue Hollow core optical fibers that was published in Fibers
Optically Pumped Far Infrared Molecular Lasers
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Author : Paul D. Coleman
language : en
Publisher:
Release Date : 1980
Optically Pumped Far Infrared Molecular Lasers written by Paul D. Coleman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
This report summarizes studies on optically pumped far infrared molecular gas lasers. The research has been concerned with the general subjects of far infrared integrated optics and technology, the discovery of new optically pumped molecular laser systems, and the study and analysis of nonlinear processes (Raman and hyper-Raman) that can occur in optically pumped systems. The theoretical density matrix analysis of the gain spectra of nonlinear systems and the first detailed experimental measurements of these systems are presented. It is demonstrated that third and fifth order nonlinear processes can exceed first order laser processes. An experimental study of the generation of a 22.653 GHz signal (the largest wavelength yet reported) in optically pumped NH3 is described. The frequency tunability and single shot spectral characteristics of the signal were measured with precision. A single laser pump in a four-level system can yield two laser signals, which in the linear case are not coupled together. However, with stronger pumping, nonlinear effects can couple the two laser signals with the result that the behavior of one laser signal is determined by the other and vice versa. The self-consistent analysis of this problem is described.
Handbook Of Laser Micro And Nano Engineering
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Author : KOJI SUGIOKA.
language : en
Publisher:
Release Date : 2019
Handbook Of Laser Micro And Nano Engineering written by KOJI SUGIOKA. and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Lasers in engineering categories.
This handbook provides a comprehensive review of the entire field of laser micro and nano processing, including not only a detailed introduction to individual laser processing techniques but also the fundamentals of laser-matter interaction and lasers, optics, equipment, diagnostics, as well as monitoring and measurement techniques for laser processing. Consisting of 11 sections, each composed of 4 to 6 chapters written by leading experts in the relevant field. Each main part of the handbook is supervised by its own part editor(s) so that high-quality content as well as completeness are assured. The book provides essential scientific and technical information to researchers and engineers already working in the field as well as students and young scientists planning to work in the area in the future. Lasers found application in materials processing practically since their invention in 1960, and are currently used widely in manufacturing. The main driving force behind this fact is that the lasers can provide unique solutions in material processing with high quality, high efficiency, high flexibility, high resolution, versatility and low environmental load. Macro-processing based on thermal process using infrared lasers such as CO2 lasers has been the mainstream in the early stages, while research and development of micro- and nano-processing are becoming increasingly more active as short wavelength and/or short pulse width lasers have been developed. In particular, recent advances in ultrafast lasers have opened up a new avenue to laser material processing due to the capabilities of ultrahigh precision micro- and nanofabrication of diverse materials. This handbook is the first book covering the basics, the state-of-the-art and important applications of the dynamic and rapidly expanding discipline of laser micro- and nanoengineering. This comprehensive source makes readers familiar with a broad spectrum of approaches to solve all relevant problems in science and technology. This handbook is the ultimate desk reference for all people working in the field.
Optics Letters
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Author :
language : en
Publisher:
Release Date : 2006
Optics Letters 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 Optics categories.
Raman Fiber Lasers
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Author : Yan Feng
language : en
Publisher: Springer
Release Date : 2017-10-05
Raman Fiber Lasers written by Yan Feng and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-10-05 with Science categories.
This book serves as a comprehensive, up-to-date reference about this cutting-edge laser technology and its many new and interesting developments. Various aspects and trends of Raman fiber lasers are described in detail by experts in their fields. Raman fiber lasers have progressed quickly in the past decade, and have emerged as a versatile laser technology for generating high power light sources covering a spectral range from visible to mid-infrared. The technology is already being applied in the fields of telecommunication, astronomy, cold atom physics, laser spectroscopy, environmental sensing, and laser medicine. This book covers various topics relating to Raman fiber laser research, including power scaling, cladding and diode pumping, cascade Raman shifting, single frequency operation and power amplification, mid-infrared laser generation, specialty optical fibers, and random distributed feedback Raman fiber lasers. The book will appeal to scientists, students, and technicians seeking to understand the recent developments and future trends of this promising and multifaceted technology.
Applications Of Molecular Spectroscopy To Current Research In The Chemical And Biological Sciences
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Author : Mark Stauffer
language : en
Publisher: BoD – Books on Demand
Release Date : 2016-10-05
Applications Of Molecular Spectroscopy To Current Research In The Chemical And Biological Sciences written by Mark Stauffer and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-10-05 with Science categories.
The goal of this book is to present an overview of applications of molecular spectroscopy to investigations in organic and inorganic materials, foodstuffs, biosamples and biomedicine, and novel characterization and quantitation methods. This text is a compilation of selected research articles and reviews covering current efforts in various applications of molecular spectroscopy. Sections 1 and 2 deal, respectively, with spectroscopic studies of inorganic and organic materials. Section 3 provides applications of molecular spectroscopy to biosamples and biomedicine. Section 4 explores spectroscopic characterization and quantitation of foods and beverages. Lastly, Section 5 presents research on novel spectroscopic methodologies. Overall, this book should be a great source of scientific information for anyone involved in characterization, quantitation, and method development.
Lab On Fiber Technology
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Author : Andrea Cusano
language : en
Publisher: Springer
Release Date : 2014-07-29
Lab On Fiber Technology written by Andrea Cusano and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-07-29 with Science categories.
This book focuses on a research field that is rapidly emerging as one of the most promising ones for the global optics and photonics community: the “lab-on-fiber” technology. Inspired by the well-established "lab on-a-chip" concept, this new technology essentially envisages novel and highly functionalized devices completely integrated into a single optical fiber for both communication and sensing applications. Based on the R&D experience of some of the world's leading authorities in the fields of optics, photonics, nanotechnology, and material science, this book provides a broad and accurate description of the main developments and achievements in the lab-on-fiber technology roadmap, also highlighting the new perspectives and challenges to be faced. This book is essential for scientists interested in the cutting-edge fiber optic technology, but also for graduate students.