Angle-resolved photoemission spectroscopy (ARPES) is used to analyze the electronic band structure in momentum and energy space for superconductors, topological insulators, transition metal dichalcogenides, and other crystalline materials. In ARPES, a deep-UV laser beam is sent onto the surface. The electrons are emitted by the photoelectric effect above the vacuum level and then collected by a detector, scanned around the sample. Analyzing the energy and momentum of the emitted electron provides the required information for a complete electronic bandstructure mapping.
Time- and angle-resolved photoemission spectroscopy (TR-ARPES) extends and complements conventional ARPES by adding femtosecond temporal resolution. TR-ARPES resolves elementary scattering processes directly in the electronic band structure as a function of energy and electron momentum due to the simultaneous measurement of the spectral and dynamic information. In such a pump-probe scheme, a femtosecond infrared laser pulse excites the sample by electron-hole pair creation, and a delayed UV pulse probes momentum and energy of electrons in the conduction band.
The ideal laser source for TR-ARPES produces deep UV photons at a high repetition rate (hundreds of kHz or higher). Intermediate pulse energy is also advantageous because high pulse energies can cause parasitic space charge effects at the measured surface. Typically, the UV photon is generated by high harmonic generation (HHG) in solids or gases.
Optical parametric amplifiers (OPAs), such as ORPHEUS-MIR and ORPHEUS-N, and optical parametric chirped-pulse amplifiers (OPCPAs) provide state-of-the-art solutions for TR-ARPES.
- 少周期脉冲，结构紧凑，占地面积小
- 800 nm、1600 nm、2000 nm 或 3000 nm 输出
- 高达MHz的重复频率
- 高对比度种子源，适用于 CPA 和 OPCPA 系统
- 卓越的功率、脉冲能量和 CEP 稳定性
- SH/TH 可选
- 高重复频率下的宽带中红外脉冲
- 2500 – 15000 nm 连续可调
- 波长 2000 nm 短脉冲高能量输出
- 工业级激光器泵浦，稳定性高
- 可选配 CEP 稳定
- 用于最短可调谐脉冲的 NOPA
- <30 fs 脉宽
- 集成棱镜压缩器
- 可调节的光谱带宽和脉宽
- 内置光谱仪检测波长
- 190 nm – 16000 nm 可调波长
- 满足所有需求的高能量和高功率型号
- 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
- 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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