Skip to Main Content
 

Global Search Box

 
 
 

ETD Abstract Container

Abstract Header

Optical Vortex Beams: Generation, Propagation and Applications

Cheng, Wen
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1375370902

Abstract Details

2013, Doctor of Philosophy (Ph.D.), University of Dayton, Electro-Optics.
An optical vortex (also known as a screw dislocation or phase singularity) is one type of optical singularity that has a spiral phase wave front around a singularity point where the phase is undefined. Optical vortex beams have a lot of applications in areas such as optical communications, LADAR (laser detection and ranging) system, optical tweezers, optical trapping and laser beam shaping. The concepts of optical vortex beams and methods of generation are briefly discussed. The properties of optical vortex beams propagating through atmospheric turbulence have been studied. A numerical modeling is developed and validated which has been applied to study the high order properties of optical vortex beams propagating though a turbulent atmosphere. The simulation results demonstrate the advantage that vectorial vortex beams may be more stable and maintain beam integrity better when they propagate through turbulent atmosphere. As one important application of optical vortex beams, the laser beam shaping is introduced and studied. We propose and demonstrate a method to generate a 2D flat-top beam profile using the second order full Poincare beams. Its applications in two-dimensional flat-top beam shaping with spatially variant polarization under low numerical aperture focusing have been studied both theoretically and experimentally. A novel compact flat-top beam shaper based on the proposed method has been designed, fabricated and tested. Experimental results show that high quality flat-top profile can be obtained with steep edge roll-off. The tolerance to different input beam sizes of the beam shaper is also verified in the experimental demonstration. The proposed and experimentally verified LC beam shaper has the potential to become a promising candidate for compact and low-cost flat-top beam shaping in areas such as laser processing/machining, lithography and medical treatment.
Zhan Qiwen, Dr. (Advisor)
131 p.
Electromagnetics; Optics
Flat-top, Polarization, Vortex Beams, Beam Shaping

Recommended Citations

Citations

  • Cheng, W. (2013). Optical Vortex Beams: Generation, Propagation and Applications [Doctoral dissertation, University of Dayton]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1375370902

    APA Style (7th edition)

  • Cheng, Wen. Optical Vortex Beams: Generation, Propagation and Applications. 2013. University of Dayton, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=dayton1375370902.

    MLA Style (8th edition)

  • Cheng, Wen. "Optical Vortex Beams: Generation, Propagation and Applications." Doctoral dissertation, University of Dayton, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1375370902

    Chicago Manual of Style (17th edition)

dayton1375370902
21,933
© 2013, all rights reserved.
This open access ETD is published by University of Dayton and OhioLINK.