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Clemson University

1. Li, Yuan. Study on the Amplification of Spatial Modes in a Crystal Rod Amplifier.

Degree: PhD, Electrical Engineering, 2016, Clemson University

In this work, the amplification of higher order modes, mainly focused on optical vortices that carry orbital angular momentum (OAM), were demonstrated and discussed in a Ho:YAG rod amplifier and Ho:YAG single crystal fiber (SCF) amplifier at 2 μm. Both experiments and simulations were carried out to understand the propagation, amplification and phase preservation of optical vortices in solid state amplifiers. A 3-D propagation model combining semi-vectorial BPM and steady state rate equations was used to verify the experimental results and to simulate the high power amplification. The amplification of optical vortices was experimentally demonstrated in a Ho:YAG rod amplifier for both – the case of incoherently multiplexed seeds and the case of coherently multiplexed seeds. A matched filter was used to evaluate the phase of the amplified seed beams and it is proven that the important phase information of the seeds was preserved through the amplification process. Pump beam profile engineering is also discussed for optimizing the gain for a desired seed beam. The amplification of optical vortices were also demonstrated in a Ho:YAG SCF amplifier. The SCF has a small diameter and a large surface-to-volume ratio to ensure guidance for both pump and seed beams. The optical spectroscopic properties, small signal gain and lasing characteristics of the Ho:YAG SCF were investigated. Then the amplification of higher order vortices was demonstrated in the SCF as well. The high power operation potential of the SCF amplifier is also discussed together with the associated thermal issues. With improved SCF fabrication techniques, SCF exhibits great potential to function as a high power multimode amplifier. Advisors/Committee Members: Dr. Eric G. Johnson, Committee Chair, Dr. John Ballato, Dr. Liang Dong, Dr. Joe Watkins, Dr. Lin Zhu.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Li, Y. (2016). Study on the Amplification of Spatial Modes in a Crystal Rod Amplifier. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1834

Chicago Manual of Style (16th Edition):

Li, Yuan. “Study on the Amplification of Spatial Modes in a Crystal Rod Amplifier.” 2016. Doctoral Dissertation, Clemson University. Accessed September 18, 2020. https://tigerprints.clemson.edu/all_dissertations/1834.

MLA Handbook (7th Edition):

Li, Yuan. “Study on the Amplification of Spatial Modes in a Crystal Rod Amplifier.” 2016. Web. 18 Sep 2020.

Vancouver:

Li Y. Study on the Amplification of Spatial Modes in a Crystal Rod Amplifier. [Internet] [Doctoral dissertation]. Clemson University; 2016. [cited 2020 Sep 18]. Available from: https://tigerprints.clemson.edu/all_dissertations/1834.

Council of Science Editors:

Li Y. Study on the Amplification of Spatial Modes in a Crystal Rod Amplifier. [Doctoral Dissertation]. Clemson University; 2016. Available from: https://tigerprints.clemson.edu/all_dissertations/1834

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