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dc.contributor.authorHoang, Tuyen 19:54:57 (GMT) 19:54:57 (GMT)
dc.description.abstractA powerful mid-infrared frequency comb in the 2-20 μm range plays a very important role in the development of optical frequency metrology, spectroscopy and other fields of technology. However, there is a big gap in the long wavelength range from 10 to 40 μm mainly because of technical challenges. Difference frequency generation has been shown to be able to generate a frequency comb due to its ability to cancel the carrier-envelope phase shift from pulse to pulse. In this thesis, the first task is to develop a compact and powerful two-color chirped pulse amplification system consisting of two Yb:fiber amplification stages. Such system is compact, stable and highly efficient by utilizing a chirped fiber Bragg grating, a all-normal dispersion photonic crystal fiber and fiber splicing. The chirped fiber Bragg grating generates a two-color signal from the supercontinuum produced in the photonic crystal fiber. An average power of 3.5 W of the two-color signal composed of two peaks at 1025 and 1085 nm is achieved after the main Yb:fiber amplifier stage. Moreover, the power ratio between the 1025 and 1085 nm wavelengths can be tunable. Particularly, the best short:long power ratio obtained is 2:1. The second task is to generate a mid-infrared wavelength of around 18 μm in a 1 mm GaSe crystal by employing the difference frequency generation technique. The generated mid-infrared power is in the range of 150-180 μW. Finally, the optical cross correlation technique to measure the timing jitter of the femtosecond Yb:fiber laser at a 65MHz repetition rate is applied for the purpose of synthesizing a frequency comb at the wavelength of 18 μm. We conclude that this Yb:fiber laser could not make a frequency comb due to its high timing jitter at around 450 fs.en
dc.publisherUniversity of Waterlooen
dc.subjectChirped pulse amplificationen
dc.subjectdifference frequency generationen
dc.subjectPhase matchingen
dc.subjectfrequency comben
dc.subjectcross correlationen
dc.subjectfiber laseren
dc.subjecttiming jitteren
dc.titleCompact Two-color Ultrafast Yb:fiber Chirped Pulse Amplifiers and Mid-infrared Generation Based on Difference Frequency Generationen
dc.typeMaster Thesisen
dc.pendingfalse and Astronomyen of Waterlooen
uws-etd.degreeMaster of Scienceen
uws.contributor.advisorStrickland, Donna
uws.contributor.affiliation1Faculty of Scienceen

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