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THz PMT
R17201-01
R17201-01 是一款光电倍增管 (PMT)，利用超表面技术进行 THz 波到电子的转换，并在 THz 波长范围具有灵敏度。该装置利用场致电子发射技术，其信号电流随入射 THz 波的电场强度呈非线性变化，从而能够增强并检测传统探测器难以检测到的 THz 波的细微变化。
特点
- 高速响应（几纳秒）
- 利用非线性响应特性测量细微变化
- 直接测量 THz 波电场强度
倍增原理
- THz 波入射到 THz PMT 的有效区域。
- 电子基于 THz 波的电场强度，通过场致电子发射从超表面发射到真空中。
- 倍增器电极收集的电子可放大 100,000 至 1,000,000 倍。
- 通过将读出系统连接到阳极，可以测量放大的信号电流。
输出特性
下图显示了 THz PMT 的输入/输出特性。
利用外部光电效应的普通 PMT/II 产生的信号电流与入射光成比例，而利用场致电子发射的 THz PMT/II 则根据入射的 THz 波非线性地增减信号电流。
这样就可以清楚地检测线性响应探测器难以检测到的入射 THz 波的细微差异。
波长特性
该图显示了 THz PMT 对于各频率 THz 波的响应特性。
图中表明，该装置在 1 THz 附近呈现最强响应，且在 0.5 至 2.0 THz 的宽范围内具有灵敏度。
可以看出，入射 THz 波所处频率发生水蒸气吸收时就会衰减，THz PMT 的信号强度也会相应减弱。
极化特性
由于 THz PMT 和 THz II 依据的是天线电场发射的检测原理，其响应会随着入射 THz 波的极化方向发生变化。
下图显示了 THz PMT 对于各个极化方向的响应特性。利用这一特性，还可以测量入射 THz 波的极化方向。
θ=90 度
THz 波的水平极化
θ=0 度
THz 波的垂直极化
详细参数
| 参数 | 说明/值 | 单位 | |
|---|---|---|---|
| 光阴极面 | 超表面 | ― | |
| 有效面积 | 6 x 6 | mm | |
| 窗材 | 石英玻璃 | ― | |
| 倍增器电极 | 结构 | 线状聚光 | ― |
| 级数 | 10 | ― | |
| 阈值电场*1 | 典型值 | 5 | kV/cm |
| 推荐的光谱灵敏度特性 | 0.5 至 2.0 | THz | |
| 电源电压 | -1500 | V | |
| 最大电源电压 | -1800 | V | |
| 上升时间*1 | 1.6 | ns | |
| 工作环境温度/存储环境温度 | -30 至 +50 | ℃ | |
*1：PMT 电源电压 -1500 V，THz 频率 1.05 THz
外形尺寸图（单位：mm）
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