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 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.
In HARPIA-TA, the TA experiment can be easily customized to get additional insight into the ultrafast dynamics of photoactive systems. For example, measuring transient reflection instead of absorption would provide more details on material surface photodynamics. Performing pump intensity-resolved absorption would help estimate the annihilation and saturation processes. Carrying TA experiments with different linear or circular pump pulse polarizations would allow obtaining molecular aggregation properties or molecular-level chirality-dependent spectra.
When the transient spectroscopy is not enough, the HARPIA-TA spectrometer can be expanded to perform time-resolved multi‑pulse and fluorescence spectroscopies using HARPIA-TB and HARPIA-TF modules, respectively.
- 块体和显微镜中的瞬态吸收和反射
- 多脉冲瞬态吸收和反射
- 飞秒荧光上转换
- 飞秒受激拉曼散射 (FSRS)
- 皮秒至微秒的荧光 TCSPC
- 依赖强度的瞬态吸收和反射
- 闪光光解、Z扫描
- 行业领先的灵敏度
- 330 nm – 24 µm 光谱范围
- 探测光延迟范围 2 ns – 8 ns
- 泵浦能量低至nJ级别
- 低温恒温器和蠕动泵支架
- 传输附加飞秒或皮秒光束
- 偏振、强度和延迟可控
- 支持飞秒受激拉曼散射（FSRS）
- 支持Z扫描
- 100 fs – 20 ps 连续可调脉宽
- 最大单脉冲能量 4 mJ
- 最高输出功率 20 W
- 单脉冲 – 1 MHz 重复频率
- BiBurst 脉冲串功能
- 自动谐波发生器（高达 5 次谐波）
- 190 fs – 20 ps 连续可调脉宽
- 最大单脉冲能量 2 mJ
- 最大输出功率 80 W
- 单脉冲 – 2 MHz 重复频率
- 脉冲选择器功能，可按需输出脉冲
- BiBurst 脉冲串模式
- 风冷型号
- 190 nm – 16000 nm 可调波长
- 单脉冲 – 2 MHz 重复频率
- 最高泵浦功率 80 W
- 最大泵浦单脉冲能量 2 mJ
- 全自动化控制
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