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An optical reference and frequency c...

Farkas, Daniel.

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

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	An optical reference and frequency comb for improved spectroscopy of helium.
作者:	Farkas, Daniel.
面頁冊數:	293 p.
附註:	Adviser: Gerald Gabrielse.
附註:	Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 1027.
Contained By:	Dissertation Abstracts International68-02B.
標題:	Physics, Atomic.
電子資源:	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:

227348
Physics, Atomic.

An optical reference and frequency comb for improved spectroscopy of helium.
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245 1 3 $a An optical reference and frequency comb for improved spectroscopy of helium.
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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.
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