论文部分内容阅读
研制的飞秒(10~(-15)s)时间分辨取样光谱仅由三部分组成:①飞秒激光探针弥散补偿光学系统,②氩激光泵浦掺钛兰宝石飞秒激光系统,③信号探测、数据采集分析处理系统。掺钛兰宝石飞秒激光器在7W氩激光全线泵浦下,能输出平均功率400mW、持续期50fs到300fs的光脉冲。其光谱可在750nm到920nm范围内调谐,经LBO晶体倍频,能得到375nm到460nm的二次谐波。整体取样光谱仪的时间分辨为90fs到320fs,光谱分辨率好于0.1nm,泵浦一探测差异吸收灵敏度达到10~(-6)～10~(-7)量级。该光谱仪已用于“八五”国家攀登计划“飞秒激光技术与超快过程研究”项目中的光合作用PSⅡ反应中心原初电荷分离等超快过程研究。
The developed femtosecond (10 ~ (-15) s) time-resolved sampling spectrum is composed of only three parts: the femtosecond laser probe dispersion compensation optical system, the argon laser-pumped titanium-doped titanium sapphire femtosecond laser system, the signal Detection, data acquisition and analysis system. Titanium-doped sapphire femtosecond laser with 7W Argon laser pump can output an average power of 400mW and a duration of 50fs to 300fs. Its spectrum can be tuned in the range of 750nm to 920nm. The second harmonics of 375nm to 460nm can be obtained by doubling LBO crystal. The overall sampling spectrometer time-resolved from 90fs to 320fs, the spectral resolution better than 0.1nm, the difference between the detection of a pump absorption sensitivity of 10 ~ (-6) ~ 10 ~ (-7). The spectrometer has been used to study the ultrafast process such as the primary charge separation in photosynthesis PSⅡ reaction center in the “August 5” National Climbing Program “Femtosecond Laser Technology and Ultrafast Process Research” project.