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光谱检测分析仪
HORIBA荧光光谱仪QuantMaster 8000
Orient KOJI液氮低温杜瓦附件LN2030
HORIBA三维荧光及吸收光谱仪Duetta
飞秒瞬态吸收/拉曼光谱仪fs-TAS
高效型CL光谱仪HCLUE
超快成像拉曼光谱仪-XploRA PLUS XS
射频辉光放电光谱仪GD-Profiler HR
模块式荧光光谱仪-Fluorolog-3
HORIBA JY高性能荧光寿命分析仪-DeltaPro
HORIBA科研级荧光光谱仪FluoroMax+
光学仪器及设备
ISS三维纳米成像及单分子跟踪套件
ISS升级激光共焦扫描显微镜到FLIM/FCS系统
ISS超分辨激光共焦扫描显微镜Alba-STED
滨松C12741-03 InGaAs红外相机
ISS激光共聚焦快速荧光寿命成像系统FLIM/FCS
滨松sCMOS相机ORCA-Flash4.0 LT
滨松sCMOS相机ORCA-Flash 4.0 V2
显微拉曼荧光成像综合测试系统
光学平台
上转换荧光寿命测试模块
元素分析仪
SLFA-UV21A紫外荧光法硫分析仪
EMIA-220V红外碳硫分析仪
EMIA-320V红外碳硫分析仪
EMIA-820V红外碳硫分析仪
EMGA-600W氧/氮/氢联合分析仪
EMGA-620W/C氧/氮分析仪
EMGA-620W氧/氮分析仪
激光粒度仪
大塚小角激光散射仪PP-1000
Horiba激光散射粒度分布分析仪(LA-950V2)
HORIBA LA960激光粒度仪
HORIBA纳米粒度分析仪
HORIBA激光散射粒度分布分析仪
X射线仪器
HORIBA X射线分析显微镜
HORIBA X-ray荧光光谱仪
制冷设备
Oxford无液氦光谱学恒温器Optistat Dry
Cryo-77液氮低温恒温器
石油专用分析仪器
SLFA-20荧光X射线硫分析仪
SLFA-2100/2800荧光X射线硫分析仪
成像系统
时间分辨小动物活体荧光成像系统i-NIR-II
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Transient Absorption Spectrometer (TAS)
可以同时获取:飞秒瞬态吸收时间分辨光谱;飞秒瞬态拉曼光谱;
Our Transient Absorption Spectrometer (TAS) is a state-of-the-art instrument for femtosecond pump-probe spectroscopy. In an ultrafast time resolved experiment using TAS, a sample of interest is excited by an electronically resonant coherent femtosecond pulse referred to as the “pump.” This causes changes to the spectrum of the sample, which are monitored as a function of time by the white light supercontinuum probe, as sensed by the combination of a spectrograph and a camera or photodiode array.
Flexibly designed femtosecond pump-probe spectrometer
Supports a variety of ultrafast amplifiers & optical parametric amplifiers as input
Broad pump-probe delay range and high pump-probe delay resolution
Flexible imaging spectrograph supports automated switching of spectral range (detector) and resolution
Robust, stable device is factory assembled and aligned for easy integration
Worldwide installation and support is available
Many samples require a pump with wavelength different from that of the fundamental wavelength of the ultrafast laser. For this reason, TAS is often sold with an external optical parametric amplifier or harmonics generator. TAS is also offered with an addition of an internal second harmonic generation (SHG) option for the pump beam. The energy of the pump beam can be controlled internally by using a variable reflective neutral density filter imprinted on a thin glass substrate. This reduces the GVD introduced to the beam while allowing power control over a range of 0-4 OD. In order to reduce the effect of laser fluctuations, a TAS measurement is most typically performed at half the repetition rate of the laser using a New Focus phase locked optical chopper to block every other pump pulse. The spectrum of the transmitted or reflected white light supercontinuum probe is compared to the spectrum when the pump is present at half the repetition rate of the laser, the fastest rate possible, in order to minimize the effect of any laser noise and fluctuations on the end measurement.
The standard maximum optical delay between pump and probe in TAS is 3.3 ns. This is limited by the length of the stage (250 mm) and the number of optical passes that the probe beam makes to and from the high quality retroreflector used on the stage. In standard configurations, there are four passes (to and from the retroreflector twice). The resolution changes depending on the mode of operation. In the best case, the resolution is set by the minimal incremental motion (MIM) of the delay stage. This is applicable when performing a single measurement where the stage is incremented linearly in only one direction. In the standard TAS configuration, this is 13.3 fs. If many scans are to be averaged, the repeatability of positioning must be considered. If performing the same measurement, the uni-directional repeatability must be accounted for, which is also 13.3 fs in the standard TAS configuration. Lastly, if the set of time points is acquired randomly, as is often the case to minimize the effect of laser and sample changes to the measured dynamics, the bi-directional repeatability is the most important factor. For the standard TAS, this has a value of 26.6 fs. While the standard specifications are more than sufficient for most experiments, upgrades are available to increase the maximum optical delay and to reduce the minimum step size. The simplest, and most cost effective, upgrade is achieved by simply adding an additional retroreflector to the delay stage. There are then eight passes (to and from both reflectors twice) and the optical delay is increased to 6.67 ns. The unfortunate disadvantage of this configuration is that the resolution is also reduced by a factor of 2. For example, the MIM becomes 26.6 fs and the bidirectional repeatability becomes 53.2 fs, which is insufficient for some laser systems. To combat the resolution limits, it is possible to replace the linear stage and motion controller from the standard TAS configuration. With the ILS250HA stage and 2 retroreflectors, the optical delay is 6.67 ns, the MIM is 8 fs and the bidirectional repeatability is 18.6 fs. Alternatively, for the very best performance, the ILS300LM stage can be used with Newport’s XPS motion controller. This allows for optical delay up to 8 ns, MIM of 0.26 fs, and bidirectional repeatability of 8 fs. Additionally, the stage can move at up to 5 times higher speed than the standard TAS model and therefore random scans do not take as much time to perform.