Undergraduate Honors Thesis

 

Variable Repetition Rate Ultra-Fast Ytterbium-Doped Fiber Laser for ARPES Public Deposited

https://scholar.colorado.edu/concern/undergraduate_honors_theses/3t945s38s
Abstract
  • Angle-Resolved Photoemission Spectroscopy, or ARPES, has been used since the early 1960s as a powerful tool to learn about the electronic structure of materials. To do this, ARPES utilizes the photoelectric effect to map out the momentum and energy bands of both bulk and surface electrons. ARPES requires high-energy photons, in the range of several eV to hundreds of eV per photon, to cause photoemission. This is generally done with synchrotrons; however, in the early 2000’s ARPES was first done with a laser as the light source (Koralek & Dessau, 2007). Typically, and previously in our lab, this light source is a titanium sapphire laser but this comes with several shortcomings. To vastly improve this system, I have designed, built, and characterized a novel Ytterbium-doped fiber laser system that uses chirped pulse amplification to achieve an average power of ~90W with repetition rates from 20 kHz to 50 MHz and pulse energy of 900 μJ with pulses of ~300 femtoseconds. This is a significant improvement from typical Ti:sapphire in terms of power, pulse energy, repetition rate, and stability. These improvements offer new ways to upconvert from using BBO’s to HHG due to the increase in peak intensity.

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  • 2024-04-23
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  • 2024-11-04
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  • Boulder
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