THz非线性光谱可以提供原子、分子、固态基本共振的新信息。THz非线性测量需要高功率THz源。AVESTA超短THz脉冲产生器Tera-AX，提供nJ量级脉冲能量。Tera-AX需要使用飞秒Ti:S放大器泵浦，例如AVESTA的Regulus或Multus产品。其他商业化的飞秒激光放大器也可以作为Tera-AX泵浦源。Tera-AX可以用于THz非线性光谱，大尺寸THz成像，或其他需要高能量超短THz脉冲的THz光学应用。Tera-AX通过基于MgO:LiNbO3相位匹配光学校正产生THz，通过倾斜飞秒激光器脉冲前沿达到相位匹配条件，光学校正和倾斜飞秒脉冲达到最高的光—THz转换效率。
AVESTA还提供选配的EO-AX电光探测器，用于测量THz脉冲电场时间波形。通过将瞬态数据进行标准快速傅里叶变换，得到THz脉冲幅值和相位。
特点：
> 1 uJ THz脉冲能量
<1 ps THz脉冲duraiton
频率范围0.5-2.5 THz
低温冷却的MgO：LiNbO3选件
太赫兹时域光谱仪选件，具有通过USB接口和Windows软件进行的电光采样
通过REUS系列或其他商用Ti：Sa放大器进行泵浦
应用领域：
时间分辨的超快研究
激光辐射的转换
高能研究
技术指标：
| TERA-AX | |
| THz output specifications | |
| THz pulse energy | up to 1* uJ |
| Optical-to-THz conversion efficiency | up to 0.1% |
| THz pulse duration | 0.5-1 ps |
| Spectral frequency range | broadband, 0.5-2.5 THz |
| THz beam divergence | 45 mrad in vertical direction; |
| 100 mrad in horizontal direction | |
| EO-AX THz time-domain spectrometer parameters (optional) | |
| Frequency resolution | 30 GHz |
| Temporal scan range | 180 ps |
| Data acquisition and analysis | Windows PC software included; USB 2.0 interface |
| Possible ranges of optical pump specifications** | |
| Central wavelength | 780-820 nm |
| Pulse duration | 50-500 fs, transform-limited pulse |
| Pulse energy | 0.5-5 mJ |
| Repetition rate | 10 Hz – 10 kHz |
| Polarization | linear, horizontal |
| Beam diameter (at 1/e^2 level) | >9 mm |
| Pulse energy stability (rms) | <1% |
| Environmental and utility specifications | |
| Operating temperature | 20-25°C |
| Relative humidity | <60%, non-condensing |
| Voltage (for EO-AX and TERA-AX-Cryo) | single-phase; 100-240 VAC; 50/60 Hz |
| Max. power consumption (for EO-AX and TERA-AX-Cryo with vacuum conditioning) | <2 kW |
| Vacuum port (for TERA-AX-Cryo) | KF16 |
| Operational pressure requirement (for TERA-AX-Cryo) | <10-5 mbar |
| Liquid nitrogen capacity (for TERA-AX-Cryo) | 1 litre |
| Dimensions | |
| TERA-AX (basic version) | 600 x 300 x 200 mm |
| TERA-AX (extended version to intergate Cryo-AX) | 930 x 630 x 480 mm |
| Cryo-AX | 220 x 220 x 380 mm |
* – obtained with the REUS-3m1k Ti:S pump laser with output specs: 1 kHz, 2 mJ, 100 fs FTL, 800 nm CWL;
** – each system is tailored to a certain set of optical pump specifications, please indicate complete pump laser specification with your request so we can estimate Tera-AX THz output values;