Rapid-Scan Nonlinear Time-Resolved Spectroscopy over Arbitrary Delay Intervals

Femtosecond dual-comb lasers have revolutionized linear Fourier-domain spectroscopy by offering a rapid motion-free, precise, and accurate measurement mode with easy registration of the combs beat note in radio frequency domain. Extensions this technique already found application for nonlinear time-resolved within energy limit available from sources operating at full oscillator repetition rate. Here, we present based on time filtering femtosecond pulse gating laser amplifier. This gives required boost to provides flexibility engineer pairs arbitrarily delayed wavelength-tunable pulses pump–probe techniques. Using dual-channel millijoule amplifier, demonstrate programmable generation both extremely short, fs, long (>ns) interpulse delays. A predetermined chosen delay can be directly realized each successive amplifier shot, eliminating massive waiting alter setting means an optomechanical line or asynchronous scan 2 free-running oscillators. We confirm versatility method measuring χ (2) cross-correlation (3) multicomponent population recovery kinetics.