High Power Laser technology, ultrafast optics and applications - 3Virtual room: Optonique - 3
|Wednesday, May 27|
HP-3-27-1 / High-field mid-infrared laser pulses and applications at ALLS
* Francois Legare, INRS-EMT, Canada
The Advanced Laser Light Source (ALLS) user facility is located at INRS-EMT near Montreal. We have access to a 750TW Titanium-Sapphire laser system and the facility will be soon upgraded with sub-kW Ytterbium laser systems including a 500W unit operating at 1kHz repetition rate. Over the recent years, my research team has used this facility to develop a set of unique tools to study ultrafast dynamics in molecules and solids. In my talk, I will present pulse compression with the stretched hollow core fiber approach enabling two-cycle pulses with sub-TW peak power at 1.8 micron. To increase the peak power, I am going to discuss Frequency domain Optical Parametric Amplification and the capability of this approach to generate CEP stable mid-IR laser pulses. In parallel, we capitalize on these developments to develop new capabilities to probe ultrafast dynamics. During my talk, I will present our recent results on tracking the insulator to metal phase transition in VO2 using high harmonics produced through the nonlinear interaction of VO2 with mid-IR laser pulses.
HP-3-27-2 / Nonlinear compression of a kW-class femtosecond laser amplifier for high power secondary sources
* Franz Tavella, SLAC national accelerator laboratory, United States
Patrick Kramer, SLAC national accelerator laboratory
Elio Champenois, SLAC national accelerator laboratory
Matthias Hoffmann, SLAC national accelerator laboratory
Matthew Windeler, SLAC national accelerator laboratory
We use spectral broadening and re-compression to achieve sub-100~fs pulses at 1030~nm wavelength with 100 kHz repetition rate with up to 7 mJ pulse energy. The nonlinear compression source has application potential for frequency conversion in spectral ranges with poor conversion efficiencies. High power THz generation based on optical rectification has been demonstrated and the setup is presently used to drive a high harmonic XUV source in a gas jet.
HP-3-27-3 / Saturated versus unsaturated hydrocarbons as nonlinear medium in hollow core fiber
Ojoon Kwon, INRS-EMT, Canada
* Reza Safaei, INRS-EMT
Philippe Lassonde, INRS-EMT
Guangyu Fan, INRS-EMT
Bruno E. Schmidr, Few-cycle Inc.
Heide Ibrahim, INRS-EMT
François Légaré, INRS-EMT
Spectral broadening of Titanium:Sapphire (Ti:Sa) laser pulses guided by a hollow core fiber (HCF) filled with saturated and unsaturated hydrocarbons is studied. Compared to the spectra from the saturated ones which are dominated by self-phase modulation, the unsaturated ones exhibit restrained blueshift. Numerical simulation verifies that the interplay of group velocity dispersion (GVD) and Raman scattering accounts for the suppressed blueshift in the unsaturated hydrocarbons.
HP-3-27-4 / KLM Ti:S oscillator with simplified cavity design
Reza Akbari, University of Manitoba
* Arkady Major, University of Manitoba, Canada
A simplified design for a hard-aperture Kerr-lens mode-locked (KLM) Ti:sapphire (Ti:S) oscillator was proposed based on the Z-scan technique. This method ensures an enhanced Kerr sensitivity required for KLM operation of the oscillator and determines the optimal cavity configuration. Numerical analysis was supported by the experimental results.