Measuring ultrashort pulses using two-photon absorption

• Grant number: 23/02764-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: May 01, 2023
• End date: April 30, 2024
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Lázaro Aurélio Padilha Junior
• Grantee: Luigi Pieri
• Host Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Associated research grant: 18/15574-6 - Advanced spectroscopy of nanomaterials: from ensemble to single-particle, AP.JP2

Abstract

There is no electronic method able to measure laser pulses shorter than 10-12 s (1 ps), consequently, for those mesaurements, it is necessary to apply methods based on nonlinear optical phenomena, such as second harmonic generation and two-photon absorption. In this proposal, we will develop a system for ultrashort pulses measurements (~100 fs) based on the photoluminescence excited by two-photon absorption. It is expected that this system will be able to measure ultrashort pulses at a broad spectral range and for laser systems operating at repetition rates varying from few Hz to MHz