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Radiation-balanced Silica Fiber Lasers and Amplifiers.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Radiation-balanced Silica Fiber Lasers and Amplifiers./
作者:	Knall, Jennifer M.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	161 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-03, Section: B.
Contained By:	Dissertations Abstracts International83-03B.
標題:	Cooling. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28688360
ISBN:	9798544204824

Radiation-balanced Silica Fiber Lasers and Amplifiers.
Knall, Jennifer M.

Radiation-balanced Silica Fiber Lasers and Amplifiers. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 161 p.

Source: Dissertations Abstracts International, Volume: 83-03, Section: B.

Thesis (Ph.D.)--Stanford University, 2021.

This item must not be sold to any third party vendors.

The performance of fiber lasers is often limited by waste heat. The resulting temperature variations in the gain medium can induce undesirable fluctuations in the laser mode, frequency, and power. To date, the only solution is the use of conventional mechanical cooling methods, which are cumbersome and sometimes detrimental to the quality of the laser output. Optical cooling through the use of anti-Stokes fluorescence (ASF) provides a compact solution that reduces or eliminates the degradation of laser performance. This phenomenon was first theorized in 1929 but not realized experimentally until 1995. Since then, only a select few gain materials have exhibited ASF cooling, and almost exclusively in bulk form and in a vacuum. All of these materials are fairly exotic and generally unavailable in a fiber form. In the realms of lasers and amplifiers, none of them have the scale or technological importance of silica fibers.In this thesis, we report an extensive theoretical and experimental investigation of ASF cooling in Ybdoped fibers at atmospheric pressure. We started by developing a model to simulate ASF cooling in a fiber doped with a quasi-two-level laser ion. This model was instrumental in optimizing the pump and fiber parameters to maximize cooling and, by fitting the model to our experimental data, it enabled us to infer fiber parameters relevant to cooling. The model was later expanded to simulate radiation-balanced lasers and amplifiers, devices in which the heat generated by the quantum defect is negated by cooling due to ASF. These models are now available to other researchers as a valuable tool to predict the amount of cooling in a very broad range of fibers.Our experimental work started with the first-ever demonstration of ASF cooling in a fiber at atmospheric pressure. The initial demonstrations were in Yb-doped ZBLAN fibers, but significant material-science breakthroughs ultimately lead to cooling in Yb-doped silica fibers, an achievement that was thought to be very unlikely due to the high levels of concentration quenching typically associated with silica. Capitalizing on this success, we used the best silica fiber to create the first radiation-balanced fiber amplifier, which exhibited 17 dB of gain (146 mw of output power) and no net heating. We then integrated the fiber into a cavity formed with fiber Bragg gratings and created the first radiation-balanced fiber laser, a device that produced 105 mW of output power and zero average temperature change along the 2.64-m fiber length. By eliminating the need for conventional coolers, this result will enable fiber lasers with lower relative intensity oise and greater temporal coherence than possible until now. Given the prominence of silica fiber lasers in technology, this new functionality is expected to have far-reaching benefits to many applications ranging from high-precision sensing to research, manufacturing, and defense.

ISBN: 9798544204824Subjects--Topical Terms:

1457878
Cooling.

Radiation-balanced Silica Fiber Lasers and Amplifiers.
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506 $a This item must not be sold to any third party vendors.
520 $a The performance of fiber lasers is often limited by waste heat. The resulting temperature variations in the gain medium can induce undesirable fluctuations in the laser mode, frequency, and power. To date, the only solution is the use of conventional mechanical cooling methods, which are cumbersome and sometimes detrimental to the quality of the laser output. Optical cooling through the use of anti-Stokes fluorescence (ASF) provides a compact solution that reduces or eliminates the degradation of laser performance. This phenomenon was first theorized in 1929 but not realized experimentally until 1995. Since then, only a select few gain materials have exhibited ASF cooling, and almost exclusively in bulk form and in a vacuum. All of these materials are fairly exotic and generally unavailable in a fiber form. In the realms of lasers and amplifiers, none of them have the scale or technological importance of silica fibers.In this thesis, we report an extensive theoretical and experimental investigation of ASF cooling in Ybdoped fibers at atmospheric pressure. We started by developing a model to simulate ASF cooling in a fiber doped with a quasi-two-level laser ion. This model was instrumental in optimizing the pump and fiber parameters to maximize cooling and, by fitting the model to our experimental data, it enabled us to infer fiber parameters relevant to cooling. The model was later expanded to simulate radiation-balanced lasers and amplifiers, devices in which the heat generated by the quantum defect is negated by cooling due to ASF. These models are now available to other researchers as a valuable tool to predict the amount of cooling in a very broad range of fibers.Our experimental work started with the first-ever demonstration of ASF cooling in a fiber at atmospheric pressure. The initial demonstrations were in Yb-doped ZBLAN fibers, but significant material-science breakthroughs ultimately lead to cooling in Yb-doped silica fibers, an achievement that was thought to be very unlikely due to the high levels of concentration quenching typically associated with silica. Capitalizing on this success, we used the best silica fiber to create the first radiation-balanced fiber amplifier, which exhibited 17 dB of gain (146 mw of output power) and no net heating. We then integrated the fiber into a cavity formed with fiber Bragg gratings and created the first radiation-balanced fiber laser, a device that produced 105 mW of output power and zero average temperature change along the 2.64-m fiber length. By eliminating the need for conventional coolers, this result will enable fiber lasers with lower relative intensity oise and greater temporal coherence than possible until now. Given the prominence of silica fiber lasers in technology, this new functionality is expected to have far-reaching benefits to many applications ranging from high-precision sensing to research, manufacturing, and defense.
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