ECE PhD Prospectus defense: Havva Begüm Kabagöz

Title: Energetic Ultrafast Frequency Generation in Fibers

Presenter: Havva Begüm Kabagöz

Advisor: Professor Siddharth Ramachandran (ECE, Physics, MSE)

Chair: Professor Ji-Xin Cheng (ECE, BME, MSE)

Committee: Professor Abdoulaye Ndao (ECE); Lars Rishoj (DTU- Denmark)

Abstract: Highly energetic ultrafast pulses are necessary for many applications ranging from nonlinear microscopy and pump-probe spectroscopy to THz generation. In-fiber generation of such pulses at select central frequencies is desirable. A Raman effect occurring for ultrashort pulses in multi-mode fibers, called Soliton Self-Mode Conversion (SSMC), relies on group index matching of two distinct modes and provides a versatile path for sources with desired frequencies and spectral separations. Here, we first show multi-color, time-synchronized pulse generation through SSMC directly out of a single aperture, increasing the available frequency difference between time-locked pulses up to ~36 THz. Then, we proceed to demonstrate SSMC with orbital angular momentum (OAM) carrying higher order modes, which yields spectrally diverse ultrafast pulses of different topological charges. We propose increasing the available frequency separation between SSMC modes by using fiber materials that offer a greater Raman shift, in particular a phosphate fiber, and increasing the soliton pulse energy by exploiting large dispersion and effective area topologically confined modes can provide. We also propose using these sources for applications such as pump-probe spectroscopy, multiphoton microscopy and mid-IR generation.

When 4:00 pm to 6:00 pm on Friday, April 9, 2021
Contact Organization ENG
Fees Free
Open To Students
Speakers Havva Begüm Kabagöz