Download or read book Sub femtosecond Precision Timing Distribution Synchronization and Coherent Synthesis of Ultrafast Lasers written by Jonathan A. Cox and published by . This book was released on 2012 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we present a complete set of techniques for sub-femtosecond measurement, control and distribution of ultrafast optical pulse trains, with respect to pulse timing and phase. First, analytical analysis of the balanced optical cross-correlator (BOC) for attosecond precision pulse timing measurement is presented for both short and long crystal devices. It is found that the sensitivity of the long crystal BOC is independent of pulse duration, to first order. In addition, analytical noise models predict 13 as rms resolution, within a 1 MHz bandwidth, for optical pulses consistent with a practical fiber optic timing link. This analysis aids the widespread adoption of the BOC technique for other wavelengths and implementations. Secondly, long term timing distribution of a 200 MHz ultrafast optical pulse train over 340 m of single mode optical fiber is demonstrated, using the BOC. In this way, the group delay of the fiber link is directly stabilized with unprecedented precision and longterm stability. In addition, by distributing the entire optical pulse train, all optical and RF harmonics are provided at the remote location for direct synchronization of remote ultrafast lasers and microwave electronics. Over 168 hours of continuous, unaided operation, a drift of 5 fs rms is achieved, with less than 1.5 fs rms drift at timescales up to 10,000 seconds. Additional analysis of factors effecting performance, such as polarization mode dispersion and fiber nonlinearity is studied through experiment and simulations. It is found that nonlinear-origin drifts can be avoided for pulse energies below 40 pJ. A chirped pulse method could be implemented to distribute pulses of higher energy. Thirdly, the first quantum-resolution timing jitter measurement of ultrafast laser timing jitter for passively mode-locked lasers up to the Nyquist frequency is presented. The total jitter from for a 79.4 MHz stretched pulse erbium fiber laser is found to be 2.6 fs rms [10 kHz, 39.7 MHz]. It is found that the timing jitter power spectral density scales with frequency according to that expected for a white noise source, in agreement with theory. However, unexpected spurious jitter at high frequencies can occur for some mode-locked states, adding up to 5.5 fs rms jitter. Similar measurements of a 200 MHz erbium fiber soliton laser reveal the decay time of center frequency fluctuations to be 17 ns, with a predicted excess noise of approximately ten. These measurements suggest that timing jitter can be decreased through improved amplifier design. Finally, the synchronization of a 8 fs fiber supercontinuum at 1200 nm to a 7 fs Ti:Sapphire laser pulse train at 800 nm is achieved for both pulse timing and phase with attosecond precision. This achievement is enabled by the development of a novel scheme for stabilization of the carrier envelope offset of the entire optical bandwidth of an octave spanning supercontinuum, without introducing excess timing jitter. In particular, by implementing an acousto-optic frequency shifting (AOFS) feedback system within a fiber supercontinuum source, carrier envelope phase locking, to the Ti:Sapphire laser, is demonstrated to within 200 mrad rms [100 Hz, 5 MHz]. Previous techniques lack the high-speed, orthogonal control of CEP and pulse timing and broad optical bandwidth for synthesizing few-cycle optical pulses. Furthermore, timing synchronization of 280 as rms is achieved through combined piezoelectric and electro-optic feedback on the fiber supercontinuum, as measured with the BOC. This work enables the synthesis of a frequency comb spanning 650 to 1400 nm, resulting in a 3.5 fs transform limited pulse duration-assuming ideal spectral phase compression. To date, the spectrum has been successfully compressed to 4.7 fs, as measured with two-dimensional spectral shearing interferometry (2DSI). Moreover, by stabilizing a fiber supercontinuum source to a low-noise Ti:Sapphire laser, the ultra-high stability of the Ti:Sapphire laser is fully transferred to the octave spanning supercontinuum.

Download or read book High precision Optical and Microwave Signal Synthesis and Distribution written by Jung-Won Kim and published by . This book was released on 2007 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, techniques for high-precision synthesis of optical and microwave signals and their distribution to remote locations are presented. The first topic is ultrafast optical pulse synthesis by coherent superposition of mode-locked lasers. Timing and phase synchronization of ultrabroadband Ti:sapphire and Cr:forsterite mode-locked lasers is studied. Subfemtosecond (0.4 fs) timing synchronization over 12 h is demonstrated. In addition to the timing lock, phase synchronization to a local oscillator with subfemtosecond accuracy (

Download or read book Sub femtosecond Optical Timing Distribution for Next generation Light Sources written by Michael Yung Peng and published by . This book was released on 2015 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Precise timing distribution is critical for realizing a new regime of light control in next-generation X-ray free-electron lasers. These facilities aim to generate sub-femtosecond (fs) X-ray pulses with unprecedented brightness to realize the long-standing scientific dream to capture chemical and physical reactions with atomic-level spatiotemporal resolution. To achieve this, a high-precision timing system is required to synchronize dozens of radio frequency (RF) and optical sources across kilometer distances with sub-fs precision. Since conventional RF timing systems have already reached a practical limit of 50 fs, next-generation systems are adopting optical technology to achieve superior performance. In this thesis, an optical timing distribution system (TDS) is developed using ultrafast mode-locked laser technology to deliver sub-fs timing stability. Optical domain components of the TDS are first presented. The timing jitter of commercial mode-locked lasers is characterized to confirm their viability as optical master oscillators for timing distribution. Stabilization of a 1.2-km dispersion-compensated polarization-maintaining fiber link is demonstrated as a proof-of-concept for eliminating polarization-induced timing drifts. The link is then enhanced to achieve state-of-the-art timing distribution across a 4.7-km fiber network with 0.58 fs RMS residual drift for over 52 hours. For a complete end-to-end TDS, a remote laser is stabilized at the output of a 3.5 km fiber link with 0.2 fs RMS residual drift. All demonstrations depend critically on the balanced optical cross-correlator for high-precision optical timing measurements. Second, the coverage of the TDS is extended into the RF domain using balanced optical-microwave phase detectors (BOMPD). Two generations of BOMPDs are developed to achieve sub-fs noise performance with MHz-level bandwidth capabilities and robust AM-PM suppression ratios (>50 dB). Optical-to-RF synchronization is demonstrated with 0.98 fs RMS drift for over 24 hours, while RF-to-optical synchronization is demonstrated with 0.5 fs RMS. Lastly, an Erbium Silicon Photonics Integrated OscillatoR (ESPIOR) based on optical frequency division (OFD) is developed for ultralow-noise microwave generation. Since f-2f interferometry is unavailable on-chip, an alternative fCEO control scheme called quasi-OFD is proposed to improve stabilization of an integrated frequency comb. The ESPIOR concept is demonstrated in a discrete testbed to achieve low-noise RF generation with -63 dBc/Hz phase noise at 10 Hz offset for a 6-GHz carrier frequency. This corresponds to an OFD ratio of 85 dB, which is close to the ideal OFD ratio of 90 dB.

Download or read book Femtosecond Optical Frequency Comb Principle Operation and Applications written by Jun Ye and published by Springer Science & Business Media. This book was released on 2006-06-15 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Femtosecond Technology written by T. Kamiya and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent rapid advances in femtosecond technology have had a great impact on their industrial applications such as: ultrafast optoelectronic devices and optical telecommunication systems, ultrashort-pulse lasers and measurement systems, and the development of novel materials for ultrafast functions. In this book, a wealth of knowledge covering requirements in applications details of recent achievements in important technical areas is presented by world-prominent authors in a concise, systematic form. As a whole, this is the first comprehensive book on the emerging field of femtosecond technology.

Download or read book Femtosecond Lasers with Diode Pumping for Using in Precision Metrology and Optical Fiber Communication written by and published by . This book was released on 2008 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: The recent merge of precision optical frequency metrology and ultrafast laser technology has made a profound impact to a number of scientific disciplines, including fundamental physical tests, precision spectroscopy in chemistry, biology, and material science, metrological support in space science, and coherent quantum control. For the area of frequency metrology on which this proposal is focused, we expect a significant increase in the stability and accuracy of frequency standards is needed and is ready to be developed, especially in light with the identification of optically based transitions with extremely high quality factors. Phase coherent connection between the optical and microwave spectral regions has now been established with direct optical frequency synthesis, with a qualitatively new regime being developed owing to the introduction of precise femtosecond laser based optical frequency comb technology. At the present time, optical fiber communication lines (OFCL) are widely used. One way for increasing the OFCL transmission capacity is the spectral separation of channels. For this, a stable chain of working optical frequencies is necessary. It is convenient to use the radiation from a stabilized femtosecond laser as such a frequency chain. The prospects for using such femtosecond synthesizers for OFCL are confirmed by the fact that there are many publications on this theme. .In first stage we propose to develop an ideal alternative system based on femtosecond diode-pumped ytterbium-laser. The use of diode pumping for crystalline lasers makes it possible to construct compact, highly efficient, as well as economical laser systems. The relatively low thermal load and compactness of the laser system help to create stable optical resonators and to obtain highly reliable laser operating parameters. A femtosecond comb system based on a Yb-laser will be much more compact and economical than its Ti:S counterpart.

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laser Spectroscopy Proceedings Of The Xv International Conference written by Cheng Chin and published by World Scientific. This book was released on 2002-06-27 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: The XV International Conference on Laser Spectroscopy brought together spectroscopists from all over the world working in the very diverse and still growing field of laser spectroscopy. It addressed a large number of modern scientific issues at the highest level.

Download or read book Laser Spectroscopy written by Steven Chu and published by World Scientific. This book was released on 2002 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The XV International Conference on Laser Spectroscopy brought together spectroscopists from all over the world working in the very diverse and still growing field of laser spectroscopy. It addressed a large number of modern scientific issues at the highest level.

Download or read book Femtosecond Laser Micromachining written by Roberto Osellame and published by Springer Science & Business Media. This book was released on 2012-03-05 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Femtosecond laser micromachining of transparent material is a powerful and versatile technology. In fact, it can be applied to several materials. It is a maskless technology that allows rapid device prototyping, has intrinsic three-dimensional capabilities and can produce both photonic and microfluidic devices. For these reasons it is ideally suited for the fabrication of complex microsystems with unprecedented functionalities. The book is mainly focused on micromachining of transparent materials which, due to the nonlinear absorption mechanism of ultrashort pulses, allows unique three-dimensional capabilities and can be exploited for the fabrication of complex microsystems with unprecedented functionalities.This book presents an overview of the state of the art of this rapidly emerging topic with contributions from leading experts in the field, ranging from principles of nonlinear material modification to fabrication techniques and applications to photonics and optofluidics.

Download or read book The Chemical Bond written by Ahmed Zewail and published by Elsevier. This book was released on 1992-05-14 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: This inspired book by some of the most influential scientists of our time--including six Nobel laureates--chronicles our emerging understanding of the chemical bond through the last nine decades and into the future. From Pauling's early structural work using x-ray and electron diffraction to Zewail's femtosecond lasers that probe molecular dynamics in real time; from Crick's molecular biology to Rich's molecular recognition, this book explores a rich tradition of scientific heritage and accomplishment. The perspectives given by Pauling, Perutz, Rich, Crick, Porter, Polanyi, Herschbach, Zewail, and Bernstein celebrate major scientific achievements in chemistry and biology with the chemical bond playing a fundamental role. In a unique presentation that also provides some lively insights into the very nature of scientific thought and discovery, The Chemical Bond: Structure and Dynamics will be of general interest to scientists, science historians, and the scientifically inclined populous.

Download or read book Coherent Laser Beam Combining written by Arnaud Brignon and published by John Wiley & Sons. This book was released on 2013-11-13 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser beam combining techniques allow increasing the power of lasers far beyond what it is possible to obtain from a single conventional laser.One step further, coherent beam combining (CBC) also helps to maintain the very unique properties of the laser emission with respect to its spectral and spatial properties. Such lasers are of major interest for many applications, including industrial, environmental, defense, and scientific applications. Recently, significant progress has beenmade in coherent beam combining lasers, with a total output power of 100 kW already achieved. Scaling analysis indicates that further increase of output power with excellent beam quality is feasible by using existing state-of-the-art lasers. Thus, the knowledge of coherent beam combining techniques will become crucial for the design of next-generation highpower lasers. The purpose of this book is to present the more recent concepts of coherent beam combining by world leader teams in the field.

Download or read book Laser Precision Microfabrication written by Koji Sugioka and published by Springer. This book was released on 2010-08-13 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: Miniaturization and high precision are rapidly becoming a requirement for many industrial processes and products. As a result, there is greater interest in the use of laser microfabrication technology to achieve these goals. This book composed of 16 chapters covers all the topics of laser precision processing from fundamental aspects to industrial applications to both inorganic and biological materials. It reviews the sate of the art of research and technological development in the area of laser processing.

Download or read book Nonlinear Photonics written by Hyatt M. Gibbs and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Optics Letters written by and published by . This book was released on 2005 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Extreme Photonics Applications written by Trevor Hall and published by Springer Science & Business Media. This book was released on 2009-12-11 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Extreme Photonics & Applications" arises from the 2008 NATO Advanced Study Institute in Laser Control & Monitoring in New Materials, Biomedicine, Environment, Security and Defense. Leading experts in the manipulation of light offered by recent advances in laser physics and nanoscience were invited to give lectures in their fields of expertise and participate in discussions on current research, applications and new directions. The sum of their contributions to this book is a primer for the state of scientific knowledge and the issues within the subject of photonics taken to the extreme frontiers: molding light at the ultra-finest scales, which represents the beginning of the end to limitations in optical science for the benefit of 21st Century technological societies. Laser light is an exquisite tool for physical and chemical research. Physicists have recently developed pulsed lasers with such short durations that one laser shot takes the time of one molecular vibration or one electron rotation in an atom, which makes it possible to observe their internal electronic structure, thereby enabling the study of physical processes and new chemical reactions. In parallel, advances in micro- and nano-structured photonic materials allow the precise manipulation of light on its natural scale of a wavelength. Photonic crystals, plasmons and related metamaterials - composed of subwavelength nanostructures - permit the manipulation of their dispersive properties and have allowed the experimental confirmation of bizarre new effects such as slow light and negative refraction. These advances open a vista on a new era in which it is possible to build lasers and engineer materials to control and use photons as precisely as it is already possible to do with electrons. http://www.photonics.uottawa.ca/nato-asi-2008/

Download or read book Femtochemistry VII written by Michele Kimble and published by Elsevier. This book was released on 2006-10-03 with total page 611 pages. Available in PDF, EPUB and Kindle. Book excerpt: Femtochemistry VII presents the most recent developments in femtochemistry and highlights the significance of the field today. This book contains extracts from the proceedings, presentations and posters from the Femtochemistry VII conference, held in Washington D.C., on July 17-22, 2005. The stimulating conference was opened by Professor Ahmed Zewail (1999 Nobel Prize Winner), and as was evident by the attendees at the conference, had a very active program with the presentation of numerous talks and a large number of posters. This collection of papers reflects the remarkable progress that has been made in femtosecond spectroscopy, and especially to its emergence as a field of research devoted to chemistry and biology, giving rise to femtochemistry and femtobiology. Subjects covered include imaging, structural dynamics, and spectroscopies, fundamentals of reaction dynamics, salvation phenomenta, liquids and interfaces, aggregates/particles/surfaces, protein dynamics and photobiology, quantum control, and intense laser-matter interactions. Subjects covered by this book include imaging, structural dynamics, and spectroscopies; fundamentals of reaction dynamics; salvation phenomenta; liquids and interfaces; aggregates/particles/surfaces; protein dynamics and photobiology; quantum control; and intense laser-matter interactions. This book would appeal to chemists, physicists and biologists in the fields of atomic and molecular science. * Contains the most recent developments in Femtochemistry from the Femtochemistry VII conference* Highlights the significance of femtochemistry today* Displays extracts from the proceedings, presentations and posters from the conference