Hollow Core Optical Fibre Based Gas Discharge Laser Systems PDF Download
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Author | : Adrian Love |
Publisher | : Springer |
Total Pages | : 107 |
Release | : 2018-06-18 |
Genre | : Science |
ISBN | : 331993970X |
Download Hollow Core Optical Fibre Based Gas Discharge Laser Systems Book in PDF, ePub and Kindle
The research in this book represents the culmination of a drive to build the first discharge gas laser unencumbered by the effects of diffraction. This breakthrough has been achieved through careful implementation of a discharge within a hollow-core optical fibre, and by developing measurement and analysis techniques to demonstrate laser action in an experimental optical cavity. Gas lasers were amongst the earliest laser types to be demonstrated and commercialised, but it was recognised that noble gas lasers were limited by the minimum bore diameter of the laser tube, which is set by diffraction. The advent, in 2011, of hollow optical fibres with optical and physical properties suitable for gas discharge lasers opened up the opportunity to break this diffraction limit. Using a mixture of helium and xenon gas, lasing in the mid-infrared range was achieved using a 100μm core flexible hollow optical fibre which, at 1m long, is several hundred times the diffraction-limited Rayleigh length.
Author | : Samuel Bateman |
Publisher | : |
Total Pages | : |
Release | : 2014 |
Genre | : |
ISBN | : |
Download Hollow Core Fibre-based Gas Discharge Laser Systems and Deuterium Loading of Photonic Crystal Fibres Book in PDF, ePub and Kindle
Author | : Samuel Alec Bateman |
Publisher | : |
Total Pages | : 0 |
Release | : 2014 |
Genre | : |
ISBN | : |
Download Hollow Core Fibre-based Gas Discharge Laser Systems and Deuterium Loading of Photonic Crystal Fibres Book in PDF, ePub and Kindle
Author | : Andrew Michael Jones |
Publisher | : |
Total Pages | : |
Release | : 2012 |
Genre | : |
ISBN | : |
Download Realizing a Mid-infrared Optically Pumped Molecular Gas Laser Inside Hollow-core Photonic Crystal Fiber Book in PDF, ePub and Kindle
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.
Author | : Neda Dadashzadeh |
Publisher | : |
Total Pages | : |
Release | : 2017 |
Genre | : |
ISBN | : |
Download Improved Performance of an Optically Pumped Mid-infrared Acetylene-filled Hollow-core Fiber Laser Book in PDF, ePub and Kindle
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.
Author | : Xin Shi |
Publisher | : |
Total Pages | : 141 |
Release | : 2009 |
Genre | : Gas lasers |
ISBN | : |
Download Gas Discharge in Hollow-core Fibers and Its Application in Waveguide Gas Lasers Book in PDF, ePub and Kindle
Author | : Chunlei Guo |
Publisher | : CRC Press |
Total Pages | : 711 |
Release | : 2021-06-23 |
Genre | : Science |
ISBN | : 1000296520 |
Download Handbook of Laser Technology and Applications Book in PDF, ePub and Kindle
This comprehensive handbook gives a fully updated guide to lasers and laser systems, including the complete range of their technical applications. The first volume outlines the fundamental components of lasers, their properties and working principles. The second volume gives exhaustive coverage of all major categories of lasers, from solid-state and semiconductor diode to fiber, waveguide, gas, chemical, and dye lasers. The third volume covers modern applications in engineering and technology, including all new and updated case studies spanning telecommunications and data storage to medicine, optical measurement, defense and security, nanomaterials processing and characterization.
Author | : Muhammad Rosdi Abu Hassan |
Publisher | : |
Total Pages | : 0 |
Release | : 2017 |
Genre | : |
ISBN | : |
Download Synchronously Pumped and Continuous Wave Mid-IR Hollow Core Fibre Gas Lasers Book in PDF, ePub and Kindle
Author | : Pradeep Kumar Gupta |
Publisher | : Springer |
Total Pages | : 352 |
Release | : 2014-11-06 |
Genre | : Science |
ISBN | : 8132220005 |
Download Laser Physics and Technology Book in PDF, ePub and Kindle
The book, ‘Laser Physics and Technology’, addresses fundamentals of laser physics, representative laser systems and techniques, and some important applications of lasers. The present volume is a collection of articles based on some of the lectures delivered at the School on ‘Laser Physics and Technology’ organized at Raja Ramanna Centre for Advanced Technology during March, 12-30, 2012. The objective of the School was to provide an in-depth knowledge of the important aspects of laser physics and technology to doctoral students and young researchers and motivate them for further work in this area. In keeping with this objective, the fourteen chapters, written by leading Indian experts, based on the lectures delivered by them at the School, provide along with class room type coverage of the fundamentals of the field, a brief review of the current status of the field. The book will be useful for doctoral students and young scientists who are embarking on a research in this area as well as to professionals who would be interested in knowing the current state of the field particularly in Indian context.
Author | : Christopher James Hensley |
Publisher | : |
Total Pages | : 0 |
Release | : 2010 |
Genre | : |
ISBN | : |
Download Intense Laser-gas Interactions in Hollow-core Photonic Band-gap Fibers Book in PDF, ePub and Kindle
This dissertation presents an experimental investigation of intense laser field propagation in hollow-core photonic band-gap fibers (HC-PBGF). The primary aim of this work has been the production of coherent extreme ultraviolet radiation by high-harmonic generation in a gas-filled fiber. The geometric properties of HC-PBGFs have the potential for a dramatic reduction of the pulse energy previously required while the guiding principles should permit enhanced conversion by phase-matching the fundamental and harmonic waves. In this effort we also studied the glass contribution to the nonlinearity of these unique fibers showing the significant change that can occur by nanometer scale deviations in the core structure. We also, by careful mode matching to the fundamental fiber mode, demonstrated record-low coupling losses which allowed peak intensity transmission nearly an order of magnitude larger than previously observed. To avoid nonlinear effects while coupling into the high-harmonic generating fiber and absorption effects when coupling out xenon was introduced by a microchannel drilled through the side of the fiber with ultrafast-laser pulses. Though we were unable to observe high harmonic generation significant progress was made toward this goal including assembly and optimization of the vacuum chamber, construction of a gas-to-fiber delivery system and characterization of our detector by generating third harmonic in a continuous jet of xenon.