The transient absorption (TA) experiment allows quantitative characterization of time-dependent absorption of an optically excited sample. Two light pulses are required: femtosecond narrow-bandwidth pump pulse to excite the sample and delayed broad-bandwidth probe pulse to measure the changes in sample transmittance. The resulting difference absorption signal is measured as a function of the probe wavelength and the temporal delay between the pump and probe pulses.
The TA spectrum is much more elaborate than, e.g., a steady-state absorption or fluorescence decay spectrum. It provides information not only on the excited states of the system but also on all the intermediate evolutionary transients and non-emissive states both on the ground and the excited states.
HARPIA-TA can be equipped with a microscopy module HARPIA-MM, enabling spatially-resolved pump-probe measurements with a spatial resolution down to 5 μm. The HARPIA-MM module features a brightfield mode to observe the sample and determine the pump-probe spot location and transmission and reflection modes to carry out the pump-probe measurements.
- 100 fs – 20 ps 连续可调脉宽
- 最大单脉冲能量 4 mJ
- 最小脉宽输出 < 100 fs
- POD 和 BiBurst 功能
- 高达 5 次谐波或可调谐扩展
- CEP 稳定或重复频率锁定
- 热稳定性和密封设计
- 190 fs – 20 ps 连续可调脉宽
- 最大输出 1 mJ @ 120 W 或 2 mJ @ 80 W
- 单脉冲 – 2 MHz 重复频率
- POD 和 BiBurst 功能
- 高达 5 次谐波或可调谐扩展
- 风冷型号
- 紧凑的工业级设计
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