[PDF] Development Of An External Cavity Diode Laser For Application To Spectroscopy And Laser Cooling And Trapping Of Rubidium eBook

Author : Charles Ian Rigby
Publisher :
Page : 47 pages
File Size : 34,77 MB
Release : 2010
Category : Laser cooling
ISBN :

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A magneto optical trap (MOT) is capable of trapping a vapor cloud consisting of atoms cooled down to the micro Kelvin range. Three orthogonal pairs of counter-propagating laser beams of the correct circular polarisation form an optical molasses which facilitates the cooling of neutral atoms. Additionally a spatially non-uniform magnetic field produced by two current carrying coils in a Maxwell gradient configuration is used to trap the cooled atoms. In this report the effects of the trap parameters, including the laser beam intensity and frequency detuning, beam diameter and magnetic field gradient, on the number of trapped atoms are discussed. Secondly the development of an experimental setup for laser cooling and trapping of 87Rb atoms in vacuum with the aid of a MOT is presented. All trap components were implemented and characterised. The vacuum system and trapping chamber in which the cooling takes place were designed and constructed. A rubidium getter to act as a source of atoms was integrated into the vacuum system. The two external cavity diode lasers used for trapping and optical re-pumping were characterised. The optical setup required for the optical molasses was designed, constructed and characterised. Saturated absorption spectroscopy was performed to investigate the hyperfine structure of 87Rb and to frequency lock the lasers. We report on the current status of the project with regards to progress, results and future work.

Author : Cunyun Ye
Publisher : World Scientific
Page : 273 pages
File Size : 45,15 MB
Release : 2004
Category : Science
ISBN : 9812560882

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This is the first book on tunable external cavity semiconductor diode lasers, providing an up-to-date survey on the physics, technology, and performance of widely applicable coherent radiation sources of tunable external cavity diode lasers. The purpose is to provide a thorough account of the state-of-the-art of tunable external cavity diode lasers which is achieved by combining this account with basic concepts of semiconductor diode lasers and its tunability with monolithic structures. The practical and accessible information in this volume will enable the reader to study external cavity diode laser, to build up the systems of external cavity diode laser as well as to develop advanced systems for their particular applications. This book will appeal to undergraduate and graduate students, scientists and engineers alike.

Author : Bob D. Guenther
Publisher : Academic Press
Page : 2253 pages
File Size : 43,14 MB
Release : 2018-02-14
Category : Technology & Engineering
ISBN : 0128149825

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The Encyclopedia of Modern Optics, Second Edition, Five Volume Set provides a wide-ranging overview of the field, comprising authoritative reference articles for undergraduate and postgraduate students and those researching outside their area of expertise. Topics covered include classical and quantum optics, lasers, optical fibers and optical fiber systems, optical materials and light-emitting diodes (LEDs). Articles cover all subfields of optical physics and engineering, such as electro-optical design of modulators and detectors. This update contains contributions from international experts who discuss topics such as nano-photonics and plasmonics, optical interconnects, photonic crystals and 2D materials, such as graphene or holy fibers. Other topics of note include solar energy, high efficiency LED’s and their use in illumination, orbital angular momentum, quantum optics and information, metamaterials and transformation optics, high power fiber and UV fiber lasers, random lasers and bio-imaging. Addresses recent developments in the field and integrates concepts from fundamental physics with applications for manufacturing and engineering/design Provides a broad and interdisciplinary coverage of specialist areas Ensures that the material is appropriate for new researchers and those working in a new sub-field, as well as those in industry Thematically arranged and alphabetically indexed, with cross-references added to facilitate ease-of-use

Author : Stephen Chung
Publisher :
Page : 0 pages
File Size : 18,46 MB
Release : 2020
Category :
ISBN :

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This thesis focuses on the construction of an atom trapping system utilising a hybrid trap setup to create a Bose-Einstein Condensate. The system involves a three chamber system, consisting of two magneto-optical traps for initial atom trapping and a science chamber to create and observe a BEC. The alkali metal of choice used in this experiment is 87Rb, as it possesses favourable properties to create a BEC. A combination of Zeeman modulation frequency stabilisation and polarisation spectroscopy is used to lock our external-cavity diode laser into the right transition frequency and a tiny open-hardware called a Beaglebone is used to remotely access these controls. Beaglebones are also utilised for a double pass configuration of acousto-optic modulators for their convenient remote access which ultimately becomes the primary parameter for troubleshooting the optical part of the experiment. A standard push beam, with a much lower intensity compared to the MOT beams, is pulsed to transport the atoms from the first MOT chamber to the second MOT chamber. By moving the atom cloud to a much lower atmosphere (≈ 10−11Torr), we are able to create a bigger atom cloud with a lower temperature which is essential in creating a BEC.

Author : Nancy J. Silva
Publisher :
Page : 268 pages
File Size : 17,56 MB
Release : 1996
Category : Laser cooling
ISBN :

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We have developed simple and inexpensive laser systems using grating-feedback diode lasers with electronic feedback to the injection current. These grating-feedback lasers can be continuously scanned up to 10 GHz and have a linewidth of 150 kHz. The three electronic frequency-stabilization systems we developed use polarization spectroscopy, etalon transmission and modified heterodyne signals as the frequency discriminators to drive an integrating servo control circuit. These laser systems are used for laser cooling and trapping of rubidium and atomic beam diagnostics. The rubidium D2 line at 780 nm is a strong, cycling transition that can be used for laser cooling and trapping. We use chirped cooling and Zeeman-tuned cooling to slow atoms from a thermal atomic beam. These atoms are loaded into a two-dimensional magneto-optic trap, or funnel. Using a frequency offset of the trapping lasers, the atoms are ejected from the funnel at a controllable velocity. The diode laser systems we have developed are a central component of this rubidium atomic funnel. We will use the funnel's bright, cold atomic beam as a source for matter-wave interferometry. We also developed an ionization detector to measure the flux and the spatial profile of the atomic beam when the background of scattered light makes fluorescent detection difficult.

Author : Brian J. Bonnell
Publisher :
Page : 98 pages
File Size : 24,89 MB
Release : 2004
Category : Absorption spectra
ISBN :

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Saturated absorption was investigated in rubidium vapor through the use of an External Cavity Diode Laser. The laser was fabricated using the Littrow configuration for an extended cavity diode laser design from the University of Melbourne. In particular, we examined the spectrum of saturated absorption in the D2 lines of rubidium. Our analysis included the existence of both direct and crossover resonances in the saturated absorption spectrum.

Author : Benjamin Halkowski
Publisher :
Page : 96 pages
File Size : 22,74 MB
Release : 2018
Category : Semiconductor lasers
ISBN :

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This thesis describes the design, construction and characterization of an external cavity diode laser (ECDL) within the context of AMO research - specifically, ultracold rubidium experiments. The main benefit over other forms of laser light is the ECDL's low cost and narrow linewidth. Having a more narrow linewidth allows us to affect specific electron states, such as for laser cooling, more precisely than broader alternatives. We find that building such a laser in house is feasible with scan range up to 4 GHz. We also note that attention to external noise, through mechanical vibrations but more importantly through temperature drifts, is necessary to produce an ECDL with a stable optical frequency.