Dr. Cornelis J. Uiterwaal Profile

Dr. Cornelis J. Uiterwaal

at Univ of Nebraska/Lincoln

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Proceedings Article | 9 February 2007 Paper

Generation and diagnosis of focused ultrashort pulses of complex light

J. Strohaber, I. Mariyenko, Cornelis Uiterwaal

Proceedings Volume 6483, 64830M (2007) https://doi.org/10.1117/12.701711

KEYWORDS: Spatial light modulators, Ultrafast phenomena, Ionization, Modulation, Diffraction gratings, Oscillators, Cameras, Diffraction, CCD cameras, Holography

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We present our current efforts to create pure transversal modes in ultrashort and intense pulses of 800 nm radiation (Ti:sapphire). Our longer-term goal is to investigate if and how optical orbital angular momentum affects intense-field excitation and ionization processes. For this purpose we need strong pulses in pure modes. Optical orbital angular momentum is present in Laguerre-Gaussian modes; in the past, we established a technique to create spatial-chirp free pure Laguerre-Gaussian modes using a pair of holographic gratings on film [Opt. Express 13, 7599-7608 (2005)]. However, this technique is unsuitable for high intensity beams, and we are currently exploring the possibilities of a liquid-crystal spatial light modulator (SLM). After careful testing, we have found that our SLM, which we operate as a phase plate, withstands without any problem the full 10¹⁰ W/cm² peak intensity of an amplified pulsed Ti:sapphire beam (< 50 fs pulse duration, repetition rate 1 kHz). Using the SLM, we have recently created a beam of ultrashort and intense pulses with a Hermite-Gaussian(1,0) profile and started to analyze this beam using optical and ionization methods.

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