Presentation Information
[16a-PB3-6]Development of a Visible-to-Mid-Infrared Multicolor BBO/KTA/ZGP OPA for Attosecond Spectroscopy at Buried Interfaces
〇Tsuneto Kanai1, Andrius Baltuska2, Hibiki Tsunekawa1,3, ChengXiang Jin1,3, Toshiki Sugimoto1,3 (1.IMS, 2.Vienna Univ. of Tech., 3.SOKENDAI)
Keywords:
Buried interface spectroscopy,Multicolor ultrafast OPA/NOPA source,Attosecond spectroscopy
Ultrafast spectroscopy at buried solid-liquid interfaces enables direct access to broken inversion symmetry, low-dimensional quantum phenomena, and interfacial dynamics relevant to electrochemistry and catalysis. However, achieving both interface selectivity and (sub-)femtosecond temporal resolution remains difficult due to background signal generation and limited wavelength tunability. Here we report a visible-to-mid-infrared multicolor hybrid OPA/NOPA system based on BBO, KTA, and ZGP crystals for attosecond spectroscopy at buried interfaces. Pumped by a high-power Yb-fiber laser, the system delivers broadband, high-energy pulses spanning the visible to 3-4 um regions. Partial passive carrier-envelope phase stabilization allows electric-field-sensitive excitation. Pulse characteristics are evaluated by SHG-FROG, and high-order harmonic generation in ZnSe driven by the mid-infrared output is demonstrated. This multicolor source enables selective probing of ultrafast electronic and vibrational dynamics at opaque and liquid-immersed interfaces.