Microstructured large-area photoconductive terahertz emitters driven at high average power

This dataset accompanies the paper "Microstructured large-area photoconductive terahertz emitters driven at high average power"

General data acquisition:

THz is generated with the Microstructured large-area photoconductive terahertz emitters at room temperature. The excitation pump power is controlled by a motorized lambda/2-waveplate  in connection with a thin-film polarizer. The bias voltage is generated with a waveforgenerator (keysight 33500B) in combination with a voltage amplifier (Falco WMA-300). The probe beam for electro-optic sampling (EOS) is guided over an oscillating delay line, having a delay range of approximately 15 ps and a shaking frequency of 1 Hz, leading to 155 THz traces in over 78 s measurement time.

THz traces obtained with EOS and a lock-in amplifier for low noise detection. THz average power is measured with a pyroelectric thin-film detector (THz 20, SLT GmbH) calibrated by the German Metrology Institute (PTB) and recorded with a lock-in amplifier for low noise detection. The recorded data via lock-in amplifier are saved as HDF-5 format.

HDF-5 is an efficient (binary), cross-platform data format and can be read easily by i.e. Python or Matlab. The graphical user interface “HDFView” can be downloaded for free (after registration) from https://www.hdfgroup.org/downloads/hdfview/. It allows to explore the folder structure of an HDF-5 file but is not necessary when using Python or Matlab.

The structure of a single HDF-5 from the uploaded raw data is

A folder called "AI", standing for analog input

The dataset "AI 1" stands for the first analog channel, containing the position of the scanning delay line. The voltage can be converted to “THz time” with a conversion factor, where 20 V corresponds to a 15 ps delay.

The dataset “AI 2”, is a voltage signal from the transimpedance amplifier and is proportional to the THz electric field.

There are additional attributes in the root-folder of the HDF-5 file.

The processed data (used in the figures) can be found in the files labeled Fig. X in each folder there is a text file "read me" that explains about recording and reading the data.

本数据集配套于论文《高平均功率驱动的微结构大面积光电导太赫兹（THz）发射源》。

通用数据采集流程：

室温下，采用微结构大面积光电导太赫兹（THz）发射源产生太赫兹辐射。激发泵浦功率通过电动lambda/2半波片与薄膜偏振片协同控制。偏置电压由波形发生器（Keysight 33500B）配合电压放大器（Falco WMA-300）产生。用于电光采样（electro-optic sampling, EOS）的探测光束经由振荡延迟线传输，其延迟范围约为15 ps，振荡频率为1 Hz，单次测量时长超过78秒，可获得155条太赫兹时域轨迹。

通过电光采样（EOS）与锁相放大器实现低噪声检测，获取太赫兹时域轨迹。太赫兹平均功率采用经德国联邦物理技术研究院（PTB）校准的热释电薄膜探测器（THz 20, SLT GmbH）进行测量，并通过锁相放大器完成低噪声采集与记录。锁相放大器采集的原始数据以HDF-5格式存储。

HDF-5是一种高效的二进制跨平台数据格式，可通过Python、Matlab等工具轻松读取。图形用户界面工具"HDFView"可从https://www.hdfgroup.org/downloads/hdfview/ 免费下载（需注册），该工具支持浏览HDF-5文件的文件夹结构，但在使用Python或Matlab时并非必需。

上传的原始数据中，单个HDF-5文件的结构如下：

包含一个名为"AI"的文件夹，为"analog input（模拟输入）"的缩写。
数据集"AI 1"对应首个模拟通道，存储扫描延迟线的位置信息。可通过转换因子将电压值转换为"太赫兹时间"，其中20 V的电压对应15 ps的延迟量。
数据集"AI 2"为跨阻放大器输出的电压信号，与太赫兹电场强度成正比。

HDF-5文件的根目录下还包含额外的属性信息。

用于论文绘图的处理后数据可在各文件夹中标注为Fig. X的文件中找到。每个文件夹内均附带文本文件"read me"，用于说明数据的记录与读取方法。