Li, Shuo
(2018)
DEVELOPMENT OF COMPACT LASERS FOR LASER REMOTE SENSING APPLCATIONS.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
Laser-induced breakdown spectroscopy (LIBS) is a powerful laser sensing technique for determination of elemental compositions that has been widely used in laboratories. There is increasing focus on the development of portable LIBS instruments for use in the field as stand-off sensing tools for harsh or dangerous environments. In this dissertation, we focus on developing compact lasers for such applications, using both conventional and advanced manufacturing method.
We first demonstrate the development of a compact actively Q-switched laser, followed by the development of a double-pulse laser based on the same optical design. Several LIBS experiments are successfully performed using these two lasers. We also investigate the advantages of using double-pulse LIBS during the early plasma stage. Significantly signal improvement has been observed. We also demonstrate selective signal enhancement which is usually achieved by using bulky and expensive high power tunable laser in the lab. The low-cost instrument and innovative technology we demonstrated here make it possible to extend such improvement to field-portable LIBS applications.
Next, we introduce the development of a compact unibody laser enabled by addictive manufacturing and its advantages compared with laser made by conventional method. We also explore the 3D printing of advanced diamond/metal composites with cellar structure. The technology exploits the flexibility of the bottom-up manufacturing schemes to produce entire laser photonic systems made of flexure, cellular structures with embedded cooling and sensing functions, as well as using advanced diamond/copper composites. The innovation in manufacturing digitization and utilization of new materials and structures will allow rapid design modification and radical design innovation in developing laser and photonic systems for wider deployments on mobile drone platforms for a wide array of industrial, consumer, environmental, and military applications.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
|
| Date: |
10 March 2018 |
| Defense Date: |
July 2018 |
| Approval Date: |
7 November 2018 |
| Submission Date: |
6 June 2018 |
| Access Restriction: |
2 year -- Restrict access to University of Pittsburgh for a period of 2 years. |
| Number of Pages: |
123 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Electrical and Computer Engineering |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Laser-induced breakdown spectroscopy,laser |
| Date Deposited: |
07 Nov 2019 06:00 |
| Last Modified: |
07 Nov 2020 06:16 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/34606 |
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