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An optical reference and frequency c...

Farkas, Daniel.

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An optical reference and frequency comb for improved spectroscopy of helium.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	An optical reference and frequency comb for improved spectroscopy of helium./
Author:	Farkas, Daniel.
Description:	293 p.
Notes:	Adviser: Gerald Gabrielse.
Contained By:	Dissertation Abstracts International68-02B.
Subject:	Physics, Atomic. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3251268

An optical reference and frequency comb for improved spectroscopy of helium.
Farkas, Daniel.

An optical reference and frequency comb for improved spectroscopy of helium. - 293 p.

Adviser: Gerald Gabrielse.

Thesis (Ph.D.)--Harvard University, 2006.

An optical frequency comb was used to transfer the high stability and narrow linewidth of an iodine optical frequency reference to a diode laser at 1083 nm. This new optical source was developed as an important step toward an improved measurement of the helium 23S - 23PJ optical transition frequencies and fine structure intervals, as needed to determine the fine structure constant alpha and test QED. The 1083 nm diode laser was used to perform saturated absorption spectroscopy on helium atoms in a variable-pressure discharge cell. Using the new source, what had been the largest source of drift was removed and an improved resolution of 100 Hz was achieved. This improved resolution was used to search for systematics that would affect helium spectroscopy at a higher level of precision. Although several improved studies of already-known systematics are presented, three new sources of systematic frequency shifts were discovered: laser beam misalignment, a residual linescan asymmetry, and an imbalance in signal sizes for transitions between resolved magnetic sublevels. As a contribution to future measurements at a higher accuracy, we measure and model these three dominant error sources, and explore their underlying physical mechanisms.Subjects--Topical Terms:

1029235
Physics, Atomic.

An optical reference and frequency comb for improved spectroscopy of helium.
LDR:02097nam 2200265 a 45 001 954223
005 20110621
008 110622s2006 eng d
035 $a (UMI)AAI3251268
035 $a AAI3251268
040 $a UMI $c UMI
100 1 $a Farkas, Daniel. $3 1277696
245 1 3 $a An optical reference and frequency comb for improved spectroscopy of helium.
300 $a 293 p.
500 $a Adviser: Gerald Gabrielse.
500 $a Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 1027.
502 $a Thesis (Ph.D.)--Harvard University, 2006.
520 $a An optical frequency comb was used to transfer the high stability and narrow linewidth of an iodine optical frequency reference to a diode laser at 1083 nm. This new optical source was developed as an important step toward an improved measurement of the helium 23S - 23PJ optical transition frequencies and fine structure intervals, as needed to determine the fine structure constant alpha and test QED. The 1083 nm diode laser was used to perform saturated absorption spectroscopy on helium atoms in a variable-pressure discharge cell. Using the new source, what had been the largest source of drift was removed and an improved resolution of 100 Hz was achieved. This improved resolution was used to search for systematics that would affect helium spectroscopy at a higher level of precision. Although several improved studies of already-known systematics are presented, three new sources of systematic frequency shifts were discovered: laser beam misalignment, a residual linescan asymmetry, and an imbalance in signal sizes for transitions between resolved magnetic sublevels. As a contribution to future measurements at a higher accuracy, we measure and model these three dominant error sources, and explore their underlying physical mechanisms.
590 $a School code: 0084.
650 4 $a Physics, Atomic. $3 1029235
650 4 $a Physics, Optics. $3 1018756
690 $a 0748
690 $a 0752
710 2 $a Harvard University. $3 528741
773 0 $t Dissertation Abstracts International $g 68-02B.
790 $a 0084
790 1 0 $a Gabrielse, Gerald, $e advisor
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3251268