Light pressure demonstrating and measuring system based on fiber optical path

Abstract

The invention discloses a light pressure demonstrating and measuring system based on a fiber optical path. A light source is included, light emitted by the light source passes a first fiber coupler, the first fiber coupler transmits 90% of optical signals to a light pressure demonstrating part and 10% of optical signals to the light pressure measuring part, the light pressure demonstrating part comprises an attenuator, an optical switch, a collimator and a slice successively, the optical switch converts continuous laser into pulse laser, and the attenuator is adjustable. According to the invention, the flexibility of the light pressure demonstrating and measuring system based on the fiber optical path is improved, and requirements for the laser power, the detector flexibility and test environments of the system are lowered. The optical path is easy to adjust and compact in structure, the experiment effect and the success rate are both improved, and the power loss of the light source is reduced. The signal processing function is flexible, data is processed via a computer, and possible errors of manual measurement can be avoided.

Description

technical field [0001] The invention relates to an optical demonstration and measurement system, in particular to an optical pressure demonstration and measurement system based on an optical fiber optical path used in optics. Background technique [0002] In the 17th century, the German astronomer Kepler used the "pressure of sunlight" to explain the phenomenon that the tail of a comet always faces away from the sun. In the 19th century, the British physicist Maxwell calculated from the electromagnetic theory of light : The pressure produced by light being incident on a black body (an object that completely absorbs light) is p=S / c (S is the value of Poynting's vector, c is the speed of light), which predicts the existence of light pressure. In 1901, the Russian physicist Lebedev successfully eliminated the influence of the transport flow and radiation force on the experiment, and completed the measurement of the light pressure on the solid for the first time. The measured so...

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Problems solved by technology

[0004] However, it is very difficult to demonstrate and measure light pressure, because under normal experimental conditions, the light pressure is only 10-6 ~ 10-7 N / m 2

However, since the discovery of lasers in the early 1960s, lasers emitted by high-power lasers have been used as light sources for light pressure experiments. However, some light pressure experiment systems have defects in the optical path, and the demonstration effect is not satisfactory. The experiment was successful. The efficiency and stability are not high. It is necessary to use a goniometer to measure the angular displacement of the suspension mirror to complete the measurement of the light pressure. The error caused by the human operation is sometimes unavoidable.

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