An electro-optical technique has been developed to measure high-frequency electric fields in free space. Electrically induced birefringence in an electro-optical crystal is used to modulate a linearly polarized continuous-wave laser beam. The modulation impressed on the laser beam contains both frequency and field intensity information. A way to use this technique as both a frequency and power meter is discussed. A proof-of-principle experiment has been carried out with a 3.1-GHz magnetron source.
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Chang et al. (1985) studied this question.
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