规格型号

PHAROS-20W,   UM100

仪器放置位置

能源材料大楼5号楼5150-3

仪器功能介绍

本套系统包括飞秒激光器、光学参量放大器、超快瞬态吸收光谱成像系统。可以实现单点及微区扫描成像探测透射和反射模式瞬态吸收光谱，研究样品中激发态在时间和空间上演化规律。

性能指标

（1）飞秒激光器，型号PHAROS-20W:
  1.中心波长1028nm±5nm；
  2.最短脉冲宽度<290fs；
  （2）共线光学参量放大器，型号TP-OR-ORPHEUS-HP:  
  1.波长调谐范围315nm-2600nm
  2.脉冲宽度<290fs：
  （3）超快瞬态吸收激光扫描成像系统，型号UM100：
  1.100倍物镜最大扫描范围≤100um×100um；
  2. 最小空间分辨率>500nm；
  3.最大检测时间窗口≤5ns；
  4.IRF1.5倍激光脉冲；
  5.可切换为反射模式；
  6.高速CMOS传感器，光谱分辨率≤1nm；采集频率5KHz/500Hz；

样品要求

均相溶液或者分散均匀悬浊液、薄膜、晶体等均可测试，微区要求样品尺寸大于1um。

仪器说明

测试前请与管理员联系，明确测试目的、测试条件等信息。

The femtosecond transient absorption (fs-TA) spectroscopy setup was driven by a PHAROS-20W laser system (Light Conversion; 1030 nm, 100 kHz, ~290 fs pulse width at half-maximum). A portion of the fundamental beam was directed #### an optical parametric amplifier (TP-OR-ORPHEUS-HP) to generate pump pulses at various wavelengths. These pump pulses were modulated at 4900 Hz using an optical chopper, and their energy was adjusted using neutral density filter wheels.

Another portion of the 1030 nm beam was attenuated and focused onto a sapphire crystal to produce broadband probe pulses spanning the visible range (500–950 nm). The time delay between the pump and probe pulses was precisely controlled by a motorized translation stage. Both pulses were focused onto the same spot on the sample, with the pump beam intentionally adjusted to have a significantly larger focal size than the probe beam, ensuring uniform excitation density across the probed region.

飞秒瞬态吸收光谱（fs-TA）实验装置由PHAROS-20W激光系统驱动（Light Conversion；波长1030 nm，重复频率100 kHz，半高全宽~290 fs）。1030nm激光被引入光学参量放大器（TP-OR-ORPHEUS-HP）以产生不同波长的泵浦脉冲。这些泵浦脉冲通过光学斩波器以4900 Hz的频率进行调制，并使用中性密度滤光片轮调节其能量。

另一束1030 nm的光经过衰减后聚焦到蓝宝石晶体上，产生覆盖可见光范围（500–950 nm）的宽带探测脉冲。泵浦脉冲和探测脉冲之间的时间延迟由电动平移台精确控制。两束脉冲被聚焦到样品的同一位置，其中泵浦光的光斑尺寸被有意调整为远大于探测光，以确保探测区域的激发密度均匀。