Electrical signal output device

Abstract

The frequency interval between two types of laser light of different wavelengths is reduced. The electrical signal output device 1 includes: a first laser light output unit 10, which receives a first stabilized laser light SL1 with a predetermined wavelength λ1 and outputs a first laser light L1 having a wavelength component of the predetermined wavelength λ1 + m × (first resonant wavelength interval λFSR1); a second laser light output unit 20, which receives a second stabilized laser light SL2 with a predetermined wavelength λ1 and outputs a second laser light L2 having a wavelength component of the aforementioned predetermined wavelength λ1 + n × (second resonant wavelength interval λFSR2); and a UTC-PD8, which receives the first laser light L1 and the second laser light L2 and outputs an electrical signal ES representing the frequency difference between the optical frequencies of the first laser light L1 and the second laser light L2. Here, m and n are positive integers. The first resonant wavelength interval λFSR1 and the second resonant wavelength interval λFSR2 are different values.

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