The electric field waveform of a light field can be used to unlock a detailed recording of its interaction with matter, but accessing it requires a measurement with subfemtosecond temporal resolution. We demonstrate nonlinear photoconductive sampling of light fields at optical frequencies in ambient air. The resulting detection method provides broadband electric field measurement in an inexpensive setup using a self-healing medium. A direct comparison is made between detection in air and in quartz, validating the technique up to 0.7 PHz. This provides both a simple route toward field metrology and a new platform for future studies in attosecond physics without the need for complex vacuum setups or sophisticated sample preparation.

中文翻译：

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空气中的皮赫兹尺度非线性光电导采样

光场的电场波形可用于解锁其与物质相互作用的详细记录，但是要访问它，则需要使用亚飞秒级的时间分辨率进行测量。我们展示了环境空气中光频率处的光场的非线性光电导采样。最终的检测方法使用自愈介质，以便宜的设置提供宽带电场测量。在空气和石英检测之间进行了直接比较，从而验证了高达0.7 PHz的技术。这不仅提供了通往野外计量的简单途径，而且为未来在阿秒物理学中的研究提供了新的平台，而无需复杂的真空设置或复杂的样品制备。