An Offset Locked, Frequency Stabilized Laser System for Precision Metrology Applications PDF Download
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Author: Charles Gregory Stroup
Publisher:
ISBN:
Category :
Languages : en
Pages : 124
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Book Description
Two offset locked frequency stabilized helium neon lasers have been developed for use on the Sub Atomic Measuring Machine's (SAMM) X, Y, and [theta][subscript]z positional feedback interferometers and custom wavelength tracking interferometer. Both utilize a commercially available offset locked iodine stabilized helium neon laser as a frequency reference for offset locked sealed cavity helium neon lasers. The offset locked lasers are housed in hermetically sealed, pressure decoupling chambers providing a high level of passive environmental stability. Actuation of the distance between the offset locked lasers' resonant mirrors is achieved by commercially available 26 [omega] thermofoil heaters with adhesive backing wrapped around the body of the laser tubes. With the use of an AOM and birefringent recombining prism, the positional interferometer offset locked laser system produces a single, 0.9 mW beam with two orthogonal polarization states that differ in frequency by approximately 20 MHz. The positional interferometer offset locked laser system provides more than twice the intensity at 1 mw and an order of magnitude greater frequency stability at 2 parts in 10[superscript]10 (over 72 hours with a frequency gate time of 300 ms) that the previous laser system, a Zygo 7701 laser head. The wavelength tracker offset locked laser has a frequency stability of 4 parts in 10[superscript]10 over 24 hours with a gate time of 300 ms. An optical system designed to divide and launch the reference signal into fibers has also been developed. This dividing platform provides six reference signals directly traceable to the definition of the meter for other offset locked lasers or for long term wavelength comparison of existing stabilized lasers, among other applications, throughout the Center for Precision Metrology.
Author: Charles Gregory Stroup
Publisher:
ISBN:
Category :
Languages : en
Pages : 124
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Book Description
Two offset locked frequency stabilized helium neon lasers have been developed for use on the Sub Atomic Measuring Machine's (SAMM) X, Y, and [theta][subscript]z positional feedback interferometers and custom wavelength tracking interferometer. Both utilize a commercially available offset locked iodine stabilized helium neon laser as a frequency reference for offset locked sealed cavity helium neon lasers. The offset locked lasers are housed in hermetically sealed, pressure decoupling chambers providing a high level of passive environmental stability. Actuation of the distance between the offset locked lasers' resonant mirrors is achieved by commercially available 26 [omega] thermofoil heaters with adhesive backing wrapped around the body of the laser tubes. With the use of an AOM and birefringent recombining prism, the positional interferometer offset locked laser system produces a single, 0.9 mW beam with two orthogonal polarization states that differ in frequency by approximately 20 MHz. The positional interferometer offset locked laser system provides more than twice the intensity at 1 mw and an order of magnitude greater frequency stability at 2 parts in 10[superscript]10 (over 72 hours with a frequency gate time of 300 ms) that the previous laser system, a Zygo 7701 laser head. The wavelength tracker offset locked laser has a frequency stability of 4 parts in 10[superscript]10 over 24 hours with a gate time of 300 ms. An optical system designed to divide and launch the reference signal into fibers has also been developed. This dividing platform provides six reference signals directly traceable to the definition of the meter for other offset locked lasers or for long term wavelength comparison of existing stabilized lasers, among other applications, throughout the Center for Precision Metrology.
Author: John L. Hall
Publisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 296
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Book Description
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: Pasquale Maddaloni
Publisher: Taylor & Francis
ISBN: 1439841535
Category : Science
Languages : en
Pages : 730
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Book Description
Foreword by Nobel laureate Professor Theodor W. Hch of Ludwig-Maximilians-UniversitätMunchenBased on the authors' experimental work over the last 25 years, Laser-Based Measurements for Time and Frequency Domain Applications: A Handbook presents basic concepts, state-of-the-art applications, and future trends in optical, atomic, and molecular physic
Author: Colin Webb
Publisher: CRC Press
ISBN: 1482240807
Category : Mathematics
Languages : en
Pages : 1183
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Book Description
The invention of the laser was one of the towering achievements of the twentieth century. At the opening of the twenty-first century we are witnessing the burgeoning of the myriad technical innovations to which that invention has led. The Handbook of Laser Technology and Applications is a practical and long-lasting reference source for scientists and engineers who work with lasers. The Handbook provides, a comprehensive guide to the current status of lasers and laser systems; it is accessible to science or engineering graduates needing no more than standard undergraduate knowledge of optics. Whilst being a self-contained reference work, the Handbook provides extensive references to contemporary work, and is a basis for studying the professional journal literature on the subject. It covers applications through detailed case studies, and is therefore well suited to readers who wish to use it to solve specific problems of their own. The first of the three volumes comprises an introduction to the basic scientific principles of lasers, laser beams and non-linear optics. The second volume describes the mechanisms and operating characteristics of specific types of laser including crystalline solid - state lasers, semiconductor diode lasers, fibre lasers, gas lasers, chemical lasers, dye lasers and many others as well as detailing the optical and electronic components which tailor the laser's performance and beam delivery systems. The third volume is devoted to case studies of applications in a wide range of subjects including materials processing, optical measurement techniques, medicine, telecommunications, data storage, spectroscopy, earth sciences and astronomy, and plasma fusion research. This vast compendium of knowledge on laser science and technology is the work of over 130 international experts, many of whom are recognised as the world leaders in their respective fields. Whether the reader is engaged in the science, technology, industrial or medical applications of lasers or is researching the subject as a manager or investor in technical enterprises they cannot fail to be informed and enlightened by the wide range of information the Handbook supplies.
Author: Jens Rauschenberger
Publisher: GRIN Verlag
ISBN: 3640096983
Category : Science
Languages : en
Pages : 146
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Book Description
Doctoral Thesis / Dissertation from the year 2007 in the subject Physics - Theoretical Physics, grade: 1,0, LMU Munich (Max-Planck-Institut für Quantenoptik), language: English, abstract: The investigation of laser-matter interactions calls for ever shorter pulses as new effects can thus be explored. With laser pulses consisting of only a few cycles of the electric field, the phase of these electric field oscillations becomes important for many applications. In this thesis ultrafast laser sources are presented that provide few-cycle laser pulses with controlled evolution of the electric field waveform. Firstly, a technique for phasestabilizing ultra-broadband oscillators is discussed. With a simple setup it improves the reproducibility of the phase by an order of magnitude compared to previously existing methods. In a further step, such a phase-stabilized oscillator was integrated into a chirped-pulse amplifier. The preservation of phase-stability during amplification is ensured by secondary phase detection. The phase-stabilized intense laser pulses from this system were employed in a series of experiments that studied strong-field phenomena in a time-resolved manner. For instance, the laser-induced tunneling of electrons from atoms was studied on a sub-femtosecond timescale. Additional evidence for the reproducibility of the electric field waveform of the laser pulses is presented here: individual signatures of the electric field half-cycles were found in photoelectron spectra from above-threshold ionization. Frequency conversion of intense laser pulses by high-order harmonic generation is a common way of producing coherent light in the extreme ultraviolet (XUV) spectral region. Many attempts have been made to increase the low efficiency of this nonlinear process, e.g. by quasi phase-matching. Here, high-harmonic generation from solid surfaces under grazing incidence instead from a gas target is studied as higher efficiencies are expected in this configuration. Another approach to increasing the efficiency of high-harmonic generation is the placing of the gas target in an enhancement resonator. Additionally, the production of XUV photons happens at the full repetition rate of the seeding laser, i.e. in the region of several tens to hundreds of megahertz. This high repetition rate enables the use of the XUV light for high-precision optical frequency metrology with the frequency comb technique. With such an arrangement, harmonics up to 15th order were produced. A build-up cavity that stacks femtosecond laser pulses in a coherent manner to produce intra-cavity pulse energies of more than ten microjoules at a repetition rate of ten megahertz is presented here...
Author: Ian W. Hage
Publisher:
ISBN:
Category : Lasers
Languages : en
Pages : 68
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Book Description
An offset laser lock is an optoelectronic system capable of stabilizing a laser's optical frequency to a variable offset from another stable laser's frequency. The lock system described in this report relies on a digital frequency comparison of the beat note of two lasers to determine and fix the frequency difference, or offset, between them. This thesis describes the construction of a configurable proportional-integral (PI) control circuit to regulate a laser's frequency based on the error signal generated by a digital comparison of the beat note frequency, as well as the integration of formerly unconnected circuit elements within the laser lock. Testing confirms the proper operation of both the PI circuit and the laser lock system.
Author: Heike Christopher
Publisher: Cuvillier Verlag
ISBN: 3736963998
Category : Science
Languages : en
Pages : 206
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Book Description
Optical frequency combs (OFC) have revolutionized various applications in applied and fundamental sciences that rely on the determination of absolute optical frequencies and frequency differences. The latter requires only stabilization of the spectral distance between the individual comb lines of the OFC, allowing to tailor and reduce system complexity of the OFC generator (OFCG). One such application is the quantum test of the universality of free fall within the QUANTUS experimental series. Within the test, the rate of free fall of two atomic species, Rb and K, in micro-gravity will be compared. The aim of this thesis was the development of a highly compact, robust, and space-suitable diode laser-based OFCG with a mode-locked optical spectrum in the wavelength range around 780 nm. A diode laser-based OFCG was developed, which exceeds the requirements with a spectral bandwidth > 16 nm at 20 dBc, a comb line optical power > 650 nW (at 20 dBc), a pulse repetition rate of 3.4 GHz, and an RF linewidth of the free-running pulse repetition rate < 10 kHz. To realize a proof-of-concept demonstrator module, the diode laser-based OFCG was hybrid-integrated into a space-suitable technology platform that has been developed for future QUANTUS experiments. Proof of sufficient RF stability of the OFCG was provided by stabilizing the pulse repetition rate to an external RF reference. This resulted in a stabilized pulse repetition rate with an RF linewidth smaller than 1.4 Hz (resolution limited), thus exceeding the requirement. The developed diode laser-based OFCG represents an important step towards an improved comparison of the rate of free fall of Rb and K quantum gases within the QUANTUS experiments in micro-gravity.
Author: Colin E. Webb
Publisher: CRC Press
ISBN: 9780750309660
Category : Technology & Engineering
Languages : en
Pages : 1218
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Book Description
Author: Nicolas Schuhler
Publisher:
ISBN:
Category :
Languages : en
Pages : 166
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Book Description
The forthcoming instrument of the Very Large Telescope Interferometer (VLTI), called Phase-Referenced Imaging and Micro-arcsecond Astrometry facility (PRIMA), uses a laser metrology system to monitor the variations of internal path lengths. This dissertation addresses the development, integration and test of frequency stabilized laser sources for the PRIMA Metrology system (PRIMET).In the first part, we present in the context of PRIMA and the VLTI the specifications of PRIMET. We recall the basics of single-wavelength laser interferometry and introduce the problems raised by its application to PRIMET. We present the need for the absolute frequency stabilization of PRIMET laser and the interest for an upgrade of PRIMET towards absolute distance measurements.In the second part, we present our contribution to the absolute frequency stabilization of PRIMET Nd:YAG laser on a transition of iodine. We characterize the system and measure precisely its performance with a self-referenced optical frequency comb. We improve the system to reach the specifications in terms of accuracy and stability of the locking frequency.The third part addresses the upgrade of PRIMET towards absolute distance measurements by the use of two-wavelength interferometry. We propose a new concept of two-wavelength laser source frequency stabilized on an optical frequency comb. This permits the generation of an unprecedented large choice of synthetic wavelength with a relative accuracy better than 10-11 in vacuum. We validate the concept on a prototype and shows that it can be used to resolve an optical wavelength. Finally, we propose to apply this concept to the upgrade of PRIMET.
