A regenerative amplifier (Spitfire, Spectra-Physics) seeded by a Ti:sapphire oscillator (MaiTai SP, Spectra-Physics) was used to produce about 7 W of 800 nm, 35 fs pulses at a 2 kHz repetition rate. Around 40% output beam was used to generate a broadband IR beam (∼500 cm−1) centered at about 3,300 cm−1 by pumping an TOPAS-C/DFG system (Spectra-Physics), while the rest of the output beam was used to generate a narrowband beam (NIR) of ∼3 nm bandwidth by passing through an interference filter (LL01-808-25, Semrock). The NIR and IR beams were then focused and overlapped at the silica/water interface with incident angles of 45° and 60° (in air), respectively. The generated SFG signal was detected by a spectrograph (Acton SP300i, Princeton Instruments) and CCD camera (PyLoN: 400BR eXcelon, Princeton Instruments). All SF experiments were conducted in the atmosphere and room temperature. The beam polarization combination used was SSP (S for the SF beam, S for NIR, and P for IR).
Maitai sp
Manufactured by Spectra-Physics
Sourced in United States
The MaiTai SP is a mode-locked Ti:Sapphire laser produced by Spectra-Physics. It is designed to provide ultrashort pulses with a center wavelength range of 690-1040 nm and a pulse duration of less than 100 femtoseconds. The laser features a repetition rate of 80 MHz.
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2 protocols using maitai sp
1
Nonlinear Optical Spectroscopy at Silica-Water Interface
2
Ultrafast Transient Absorption Spectroscopy
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Transient absorption spectra were measured as described before. 38 Briefly, a modular laser system was used, consisting of an ultrafast Ti:sapphire regenerative amplifier (Spitfire Ace-100F, Spectra-Physics, USA) seeded with a Ti:sapphire oscillator (MaiTai SP, Spectra-Physics, USA), and pumped by Nd: YLF laser (Empower 30, Spectra-Physics, USA). The generated ∼100 fs pulses (800 nm) at 1 kHz repetition rate were divided into excitation and probe beams by a beam splitter. Tunable excitation pulses were generated by an optical parametric amplifier (TOPAS-C, Light Conversion, Lithuania). A 2 mm sapphire plate was used to generate a broadband (450-750 nm) white light pulse. The probe beam was focused to the sample, overlapping with the excitation beam. Probe and reference beams were then focused to the entrance slit of a spectrograph where the beams were dispersed onto a double CCD detection system (Pascher Instruments, Sweden). The time delay between the excitation and probe pulses was introduced by a computer-controlled delay line. The mutual polarisation of the excitation and probe beams was set to the magic angle (54.7°).
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