Experimental device and method for thermal lens effect of light transmission in non-uniform temperature field

Abstract

An experiment apparatus for a light transmission thermal lens effect in a non-uniform temperature field is characterized in that a base is provided with a transparent water tank in which water is arranged thereon, the right outside surface of the transparent water tank is provided with a coordinate paper, the front sidewall and the rear sidewall in the transparent water tank are provided with at least one semiconductor cooler support equipped with a semiconductor cooler, the front side surface of each semiconductor cooler is a hot surface or a cold surface and is perpendicular to a horizontal plane, the semiconductor cooler support(s) and the semiconductor cooler(s) are immersed into the water, the distance from the upper surface of the semiconductor cooler to the water surface is at least 100mm, a laser support equipped with a semiconductor laser is arranged on the base at the left side outside the transparent water tank, a laser beam which is emitted by the semiconductor laser and has a divergence angle ranging from 10 degrees to 20 degrees penetrates the left sidewall of the transparent water tank, then passes through the water between the semiconductor coolers at two sides, and is projected onto the coordinate paper to form a round light spot. The experiment apparatus of the present invention is simple in structure, low in cost, simple and convenient in method, and good in intuition, thus the experiment apparatus is especially suitable for demonstrating an experiment in a laboratory and in class.

Description

technical field [0001] The invention belongs to the technical field of experimental teaching instruments, and in particular relates to an experimental device for thermal lens effect in a non-uniform temperature field. Background technique [0002] Studying the propagation characteristics of laser in atmospheric turbulence has important theoretical and practical significance. In many laser application fields, such as laser communication, laser ranging and laser weapons, etc., it is inevitable to encounter the problem of laser beam transmission along non-uniform turbulent flow. [0003] The atmosphere is composed of gas molecules, liquid water, dust, electrons, ions, and aerosols. Due to the influence of temperature changes, air pressure, and water vapor pressure fluctuations, the temperature, humidity, and density of the atmosphere are constantly changing. When the light wave propagates in the atmosphere, its properties will change, and its physical essence is due to the inf...

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Problems solved by technology

[0004] As mentioned above, the thermal lens effect of inhomogeneous atmosphere in light transmission is only manifested after long-distance transmission. At the same time, due to the inhomogeneity of the atmosphere, it is often a continuous gradient rather than a sudden change from a physical point of view. It is difficult to achieve this condition in the laboratory

As another fluid, water has properties and motion laws very similar to the atmosphere. At the same time, the heat capacity of water is much larger than that of air. It is easy to establish a high gradient temperature field in a limited volume of water. Thermal lens effect during water transmission, but there is no related experimental demonstration device so far. When students accept this concept, they can only rely on imagination to complete it, which affects their deep understanding

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