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Author: Jun Ye
Publisher: Springer Science & Business Media
ISBN: 0387237917
Category : Science
Languages : en
Pages : 373
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Book Description
Over the last few years, there has been a convergence between the fields of ultrafast science, nonlinear optics, optical frequency metrology, and precision laser spectroscopy. These fields have been developing largely independently since the birth of the laser, reaching remarkable levels of performance. On the ultrafast frontier, pulses of only a few cycles long have been produced, while in optical spectroscopy, the precision and resolution have reached one part in Although these two achievements appear to be completely disconnected, advances in nonlinear optics provided the essential link between them. The resulting convergence has enabled unprecedented advances in the control of the electric field of the pulses produced by femtosecond mode-locked lasers. The corresponding spectrum consists of a comb of sharp spectral lines with well-defined frequencies. These new techniques and capabilities are generally known as “femtosecond comb technology. ” They have had dramatic impact on the diverse fields of precision measurement and extreme nonlinear optical physics. The historical background for these developments is provided in the Foreword by two of the pioneers of laser spectroscopy, John Hall and Theodor Hänsch. Indeed the developments described in this book were foreshadowed by Hänsch’s early work in the 1970s when he used picosecond pulses to demonstrate the connection between the time and frequency domains in laser spectroscopy. This work complemented the advances in precision laser stabilization developed by Hall.
Author: Jun Ye
Publisher: Springer Science & Business Media
ISBN: 0387237917
Category : Science
Languages : en
Pages : 373
Get Book Here
Book Description
Over the last few years, there has been a convergence between the fields of ultrafast science, nonlinear optics, optical frequency metrology, and precision laser spectroscopy. These fields have been developing largely independently since the birth of the laser, reaching remarkable levels of performance. On the ultrafast frontier, pulses of only a few cycles long have been produced, while in optical spectroscopy, the precision and resolution have reached one part in Although these two achievements appear to be completely disconnected, advances in nonlinear optics provided the essential link between them. The resulting convergence has enabled unprecedented advances in the control of the electric field of the pulses produced by femtosecond mode-locked lasers. The corresponding spectrum consists of a comb of sharp spectral lines with well-defined frequencies. These new techniques and capabilities are generally known as “femtosecond comb technology. ” They have had dramatic impact on the diverse fields of precision measurement and extreme nonlinear optical physics. The historical background for these developments is provided in the Foreword by two of the pioneers of laser spectroscopy, John Hall and Theodor Hänsch. Indeed the developments described in this book were foreshadowed by Hänsch’s early work in the 1970s when he used picosecond pulses to demonstrate the connection between the time and frequency domains in laser spectroscopy. This work complemented the advances in precision laser stabilization developed by Hall.
Author: Jun Ye
Publisher: Springer Science & Business Media
ISBN: 9780387237909
Category : Science
Languages : pt
Pages : 384
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Book Description
Over the last few years, there has been a convergence between the fields of ultrafast science, nonlinear optics, optical frequency metrology, and precision laser spectroscopy. These fields have been developing largely independently since the birth of the laser, reaching remarkable levels of performance. On the ultrafast frontier, pulses of only a few cycles long have been produced, while in optical spectroscopy, the precision and resolution have reached one part in Although these two achievements appear to be completely disconnected, advances in nonlinear optics provided the essential link between them. The resulting convergence has enabled unprecedented advances in the control of the electric field of the pulses produced by femtosecond mode-locked lasers. The corresponding spectrum consists of a comb of sharp spectral lines with well-defined frequencies. These new techniques and capabilities are generally known as “femtosecond comb technology. ” They have had dramatic impact on the diverse fields of precision measurement and extreme nonlinear optical physics. The historical background for these developments is provided in the Foreword by two of the pioneers of laser spectroscopy, John Hall and Theodor Hänsch. Indeed the developments described in this book were foreshadowed by Hänsch’s early work in the 1970s when he used picosecond pulses to demonstrate the connection between the time and frequency domains in laser spectroscopy. This work complemented the advances in precision laser stabilization developed by Hall.
Author: Jun Ye
Publisher: Springer
ISBN: 9781441936608
Category : Science
Languages : en
Pages : 0
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Book Description
Over the last few years, there has been a convergence between the fields of ultrafast science, nonlinear optics, optical frequency metrology, and precision laser spectroscopy. These fields have been developing largely independently since the birth of the laser, reaching remarkable levels of performance. On the ultrafast frontier, pulses of only a few cycles long have been produced, while in optical spectroscopy, the precision and resolution have reached one part in Although these two achievements appear to be completely disconnected, advances in nonlinear optics provided the essential link between them. The resulting convergence has enabled unprecedented advances in the control of the electric field of the pulses produced by femtosecond mode-locked lasers. The corresponding spectrum consists of a comb of sharp spectral lines with well-defined frequencies. These new techniques and capabilities are generally known as “femtosecond comb technology. ” They have had dramatic impact on the diverse fields of precision measurement and extreme nonlinear optical physics. The historical background for these developments is provided in the Foreword by two of the pioneers of laser spectroscopy, John Hall and Theodor Hänsch. Indeed the developments described in this book were foreshadowed by Hänsch’s early work in the 1970s when he used picosecond pulses to demonstrate the connection between the time and frequency domains in laser spectroscopy. This work complemented the advances in precision laser stabilization developed by Hall.
Author: Pfeifle, Joerg
Publisher: KIT Scientific Publishing
ISBN: 3731506408
Category : Technology (General)
Languages : en
Pages : 204
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Book Description
Energy-efficient Tbit/s optical interconnects are key elements for future communication systems. Three novel optical frequency comb sources are investigated, which have the potential of being integrated in chip-scale Tbit/s transmitters. Such frequency combs provide a large number of carriers. The equidistance of the comb lines helps to minimize spectral guard bands. For each type of comb source, coherent data transmission experiments show the potential for Tbit/s data transmission rates.
Author: Hamish Randle
Publisher:
ISBN:
Category : Microresonators (Optoelectronics)
Languages : en
Pages : 93
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Book Description
Optical frequency combs are an exciting area of research with applications in Spectroscopy, optical sensing and telecommunications and in addition they have revolutionized the optical clock. Octave spanning frequency combs have been recently demonstrated using Microresonators. Made from a transparent material, these devices have spherical or toroidal shape and are typically between tens and hundreds of micrometers in size. The light is coupled in through a prism or fibre taper using evanescent wave coupling and circulates the cavity in highly confined whispering gallery modes. Due to the small modal cross section and long photon lifetimes there is a low threshold for nonlinear interaction. Researchers envisage these devices being used for low power microchip scale frequency comb sources in photonic devices. There has been much work on the experimental side of Microresonators, but little in the way of modelling, in particular the interesting nonlinear optical properties of these devices. This thesis describes a new method for modelling microresonator frequency combs, which reduces computational time compared to existing approaches. Two numerical simulation methods, the Newton-Raphson and split step Fourier, are chosen for their suitability to the study of steady state and dynamic regimes respectively. Simulations were performed using code written in MATLAB. We were able to simulate frequency combs with spans exceeding one octave of the spectral domain and containing over 1000 spectral modes, more than twice the number of modes than in any previously published study. The comb spectra were found to be in good agreement with experimental combs published by other researchers. Finally, some inroads were made to a numerical study of comb versatility.
Author: Auro Michele Perego
Publisher: CRC Press
ISBN: 9781032548081
Category : Science
Languages : en
Pages : 0
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Book Description
"In this book we will discuss both the operating principles and performance limits of a wide range of device technologies, and the technological requirements of applications. We will identify close synergies where technology capabilities and application requirements are closely aligned, and opportunities for generic optical frequency combs where multiple solutions and applications exist simultaneously. The main topics to be covered will include:(i) Different sources and methods of optical frequency combs generation including mode-locked lasers, optical resonators, opto-electronics, and nonlinear fibres. (ii) Applications of optical frequency combs in different technologies including sensing, spectroscopy, metrology, distance ranging and optical communications. (iii) Blue-sky novel physical concepts and promising future research directions for the field. With this book we aim at showcasing top level advances by key players in a multifaceted research ecosystem, and at the same time at providing a valuable service to our research community, by offering a comprehensive review which, at the same time, highlights challenges to be solved and promising future directions. This book will be a valuable resource for academics and researchers working in optical frequency combs, and more broadly in photonics and laser physics. It will also be of interest to postgraduate and graduate students of photonics and laser physics"
Author: Jörg Pfeifle
Publisher:
ISBN: 9781013283024
Category : Computers
Languages : en
Pages : 200
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Book Description
Energy-efficient Tbit/s optical interconnects are key elements for future communication systems. Three novel optical frequency comb sources are investigated, which have the potential of being integrated in chip-scale Tbit/s transmitters. Such frequency combs provide a large number of carriers. The equidistance of the comb lines helps to minimize spectral guard bands. For each type of comb source, coherent data transmission experiments show the potential for Tbit/s data transmission rates. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.
Author: Hyatt M. Gibbs
Publisher: Springer Science & Business Media
ISBN: 3642754384
Category : Science
Languages : en
Pages : 218
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Book Description
Nonlinear photonics is the name given to the use of nonlinear optical devices for the generation, communication, processing, or analysis of information. This book is a progress report on research into practical applications of such devices. At present, modulation, switching, routing, decision-making, and detection in photonic systems are all done with electronics and linear optoelectronic devices. However, this may soon change, as nonlinear optical devices, e.g. picosecond samplers and switches, begin to complement optoelectonic devices. The authors succinctly summarize past accomplishments in this field and point to hopes for the future, making this an ideal book for newcomers or seasoned researchers wanting to design and perfect nonlinear optical devices and to identify applications in photonic systems.
Author: Marina Zajnulina
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Optical frequency combs (OFC) constitute an array of phase-correlated equidistant spectral lines with nearly equal intensities over a broad spectral range. The adaptations of combs generated in mode-locked lasers proved to be highly efficient for the calibration of high-resolution (resolving power > 50000) astronomical spectrographs. The observation of different galaxy structures or the studies of the Milky Way are done using instruments in the low- and medium resolution range. To such instruments belong, for instance, the Multi Unit Spectroscopic Explorer (MUSE) being developed for the Very Large Telescope (VLT) of the European Southern Observatory (ESO) and the 4-metre Multi-Object Spectroscopic Telescope (4MOST) being in development for the ESO VISTA 4.1 m Telescope. The existing adaptations of OFC from mode-locked lasers are not resolvable by these instruments. Within this work, a fibre-based approach for generation of OFC specifically in the low- and medium resolution range is studied numerically. This approach consists of three optical fibres that are fed by two equally intense continuous-wave (CW) lasers. The first fibre is a conventional single-mode fibre, the second one is a suitably pumped amplifying Erbium-doped fibre with anomalous dispersion, and the third one is a low-dispersion highly nonlinear optical fibre. The evolution of a frequency comb in this system is governed by the following processes: as the two initial CW-laser waves with different frequencies propagate through the first fibre, they generate an initial comb via a cascade of four-wave mixing processes. The frequency components of the comb are phase-correlated with the original laser lines and have a frequency spacing that is equal to the initial laser frequency separation (LFS), i.e. the difference in the laser frequencies. In the time domain, a train of pre-compressed pulses with widths of a few pico-seconds arises out of the initial bichromatic deeply-modulated cosine-wave. These pulses undergo strong compression in the subsequent amplifying Erbium-doped fibre: sub-100 fs pulses with broad OFC spectra are formed. In the following low-dispersion highly nonlinear fibre, the OFC experience a further broadening and the intensity of the comb lines are fairly equalised. This approach was mathematically modelled by means of a Generalised Nonlinear Schrödinger Equation (GNLS) that contains terms describing the nonlinear optical Kerr effect, the delayed Raman response, the pulse self-steepening, and the linear optical losses as well as the wavelength-dependent Erbium gain profile for the second fibre. The initial condition equation being a deeply-modulated cosine-wave mimics the radiation of the two initial CW lasers. The numerical studies are performed with the help of Matlab scripts that were specifically developed for the integration of the GNLS and the initial condition according to the proposed approach for the OFC generation. The scripts are based on the Fourth-Order Runge-Kutta in the Interaction Picture Method (RK4IP) in combination with the local error method. This work includes the studies and results on the length optimisation of the first and the second fibre depending on different values of the group-velocity dispersion of the first fibre. Such length optimisation studies are necessary because the OFC have the biggest possible broadband and exhibit a low level of noise exactly at the optimum lengths. Further, the optical pulse build-up in the first and the second fibre was studied by means of the numerical technique called Soliton Radiation Beat Analysis (SRBA). It was shown that a common soliton crystal state is formed in the first fibre for low laser input powers. The soliton crystal continuously dissolves into separated optical solitons as the input power increases. The pulse formation in the second fibre is critically dependent on the features of the pulses formed in the first fibre. I showed that, for low input powers, an adiabatic soliton compression delivering low-noise OFC occurs in the second fibre. At high input powers, the pulses in the first fibre have more complicated structures which leads to the pulse break-up in the second fibre with a subsequent degradation of the OFC noise performance. The pulse intensity noise studies that were performed within the framework of this thesis allow making statements about the noise performance of an OFC. They showed that the intensity noise of the whole system decreases with the increasing value of LFS.
Author: Md Imrul Kayes
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
"Since their inception, optical frequency combs have created novel avenues for numerous applications such as molecular spectroscopy, atomic clocks, coherent communications, and microwave photonics. The future of frequency combs lies in exploring different comb generation technique, customized for specific applications. This thesis explores the synthesis of novel optical frequency combs in the near infrared wavelength region and the applications of such combs in the field of high-resolution spectroscopy and precise distance measurement. First, the generation of an electro-optic frequency comb with adjustable central wavelength and frequency spacing is experimentally demonstrated. This frequency comb is sourced from a single mode Brillouin fiber laser having an ultra-narrow linewidth that improves the overall phase noise performance of the comb spectral lines. A combined effect of electro-optic modulation, dispersion compensation, and fiber nonlinearity convert the continuous wave laser into a wideband optical frequency comb encompassing the C-band. Next, this frequency comb is used for a high-resolution distance measurement system that operates from the repetition rate modulation of the comb signal. The repetition frequency of the electro-optic comb is adjustable with a high dynamic range. Such broad tunablity of the repetition rate facilitates the measurement of distances with μm level precision. Such a system is also capable of motion tracking thanks to the rapid scan rate of the repetition frequency. Next, the application of electro-optic combs in high-resolution Fourier transform spectroscopy is demonstrated by measuring absorption lines of a chemical sample at 1.55 μm. The pulse train from a frequency comb, subject to a repetition rate modulation, stores the spectral response of a sample when sent to a length imbalanced interferometer. Such a system is equivalent to a dual-comb spectrometer but without the need for a complex phase matching mechanism. Finally, a novel laser resonator is developed for high-resolution dual-comb spectroscopy at 1.9 μm. This resonator supports two counter-propagating laser oscillations sharing a common cavity which relaxes the phase matching requirement for dual-comb spectroscopy. A proof-of-concept experiment demonstrated the measurement of absorption lines of ambient water vapor with a 100 MHz resolution. This approach holds great promise for dual-comb spectroscopy in the mid-infrared region where many chemicals have strong fundamental transitions"--
