A method and device for filtering coherent noise in a terahertz asynchronous scanning system
A technology of coherent noise and scanning system, applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of long time, beam shift, and use for a long time, achieve low manufacturing cost, eliminate coherent noise, and improve signal-to-noise the effect of
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[0030] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0031] The invention provides a method for filtering coherent noise of a terahertz asynchronous scanning system, specifically:
[0032] In the terahertz asynchronous scanning system, a square wave signal with a frequency of Δf / 2 is loaded on the terahertz generator antenna, where Δf represents the difference frequency between the pump laser and the probe laser; thus, the square wave signal is loaded on the terahertz generator The voltage on the antenna will perform the first 0:π phase modulation on the generated terahertz signal, and the phases of two adjacent terahertz pulse signals are opposite.
[0033] For the terahertz signal processed by the transimpedance amplifier, due to the generation of coherent noise (the phases of two adjacent coherent noise signals are in phase), the noise needs to be filtered out; 0: π phase modulation, so that the phases o...
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