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Author:
Publisher:
ISBN:
Category : Atomic spectroscopy
Languages : en
Pages : 1338
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Book Description
Author:
Publisher:
ISBN:
Category : Atomic spectroscopy
Languages : en
Pages : 1338
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Book Description
Author: Bruce H. Billings
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 748
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Author:
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 2616
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Book Description
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: Charles Anders Sievers
Publisher:
ISBN:
Category :
Languages : en
Pages : 43
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Book Description
For my thesis, I worked towards using two reference cavities to provide frequency stabilization to a 486nm dye-ring laser. After a doubling cavity doubles the frequency to 243nm, the laser beam is used to excite ground state hydrogen to the 2S state: the first step of an experiment to accurately measure the 2S-NS transitions of hydrogen and measure the Lamb shift and Rydberg's constant. Two stabilization cavities were used to prevent the frequency from drifting and to narrow the laser's line-width. I aligned the majority of the optics and coupling light into fiber-optic cables and Fabrey-Perot cavities. Coupling light into a high finesse Fabrey-Perot cavity requires matching the radius of curvature of constant phase of the laser with the geometry of the cavity. To do this, I first measured the physical properties of the laser beam and then numerical arrived at a solution using two lenses to match the conditions imposed by the cavity's geometry. I aligned the cavity and then observed a Pound-Drever-Hall error signal. This error signal will be fed back into the laser to stabilize the frequency. It is anticipated that when the electronics to utilize the error signals are completed, the laser frequency will be stabilized to a hundred hertz, an four order of magnitude improvement over the stability provided by the commercial laser.
Author: N. G. Basov
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Book Description
Results are given of a experiment in creating the optical (lambda = 3.39 microns) standard of a frequency with a relative frequency stability of delta nu/nu = 5 x 10 to the minus 14th power.
Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 1240
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Book Description
Author: Yaakov Shevy
Publisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Science
Languages : en
Pages : 278
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Book Description
Author: Joseph R. Lakowicz
Publisher: Springer Science & Business Media
ISBN: 146157658X
Category : Science
Languages : en
Pages : 487
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Book Description
Fluorescence methods are being used increasingly in biochemical, medical, and chemical research. This is because of the inherent sensitivity of this technique. and the favorable time scale of the phenomenon of fluorescence. 8 Fluorescence emission occurs about 10- sec (10 nsec) after light absorp tion. During this period of time a wide range of molecular processes can occur, and these can effect the spectral characteristics of the fluorescent compound. This combination of sensitivity and a favorable time scale allows fluorescence methods to be generally useful for studies of proteins and membranes and their interactions with other macromolecules. This book describes the fundamental aspects of fluorescence. and the biochemical applications of this methodology. Each chapter starts with the -theoreticalbasis of each phenomenon of fluorescence, followed by examples which illustrate the use of the phenomenon in the study of biochemical problems. The book contains numerous figures. It is felt that such graphical presentations contribute to pleasurable reading and increased understand ing. Separate chapters are devoted to fluorescence polarization, lifetimes, quenching, energy transfer, solvent effects, and excited state reactions. To enhance the usefulness of this work as a textbook, problems are included which illustrate the concepts described in each chapter. Furthermore, a separate chapter is devoted to the instrumentation used in fluorescence spectroscopy. This chapter will be especially valuable for those perform ing or contemplating fluorescence measurements. Such measurements are easily compromised by failure to consider a number of simple principles.
Author: Deon Anton Janse van Rensburg
Publisher:
ISBN:
Category : Diodes
Languages : en
Pages : 74
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Book Description
This project sets out to frequency stabilize external cavity diode lasers of wavelengths = 935 nm and 739 nm, with an eye to Ytterbium-171 ion trapping. The desired laser linewidths were below 1 MHz at 1 second observation time and the desired long term frequency drifts were below a megahertz over the course of a few hours. To stabilize the lasers, two Pound-Drever-Hall laser frequency stabilisation systems were designed, constructed and characterized. The optical frequency references used were sub-megahertz linewidth optical cavities with Invar spacers. These cavities were designed and constructed inhouse. The achieved long term stability of the stabilized lasers was 1 MHz/h over a 5 hour measurement period. The laser frequency long term stabilities are limited by the thermal stabilities of the cavity spacers. The post stabilisation laser frequency noise was lowered when compared to the free running lasers. This was observed by determining the laser frequency noise power spectral densities. From the frequency noise power spectral densities lower bounds on the locked laser linewidths were established. This lower bound is 11.92 kHz for the 739 nm wavelength laser at 1 second observation time and 5.4 kHz for the 935 nm wavelength laser. An additional system was designed and constructed to stabilize the 935 nm wavelength laser to an in-house built piezo electrically tunable cavity noise power spectral densities to simultaneously stabilize the length of the cavity to a microwave frequency referenced to a Rubidium frequency standard. Technical limitations (optical feedback into the the 935 nm wavelength laser cavity) prohibited the implementation of a stable lock of the cavity length.
