A Four-Wave Mixed-Frequency Mercury Vapor Pool Using Tubular Constant Temperature Furnace and Cooling Jacket

Abstract

The present invention discloses a four-wave mixing mercury vapor pool using a tube type constant temperature furnace and cooling jackets and belongs to the laser technical field. The four-wave mixing mercury vapor pool comprises the tube type constant temperature furnace and a vacuum acquisition device, wherein the tube type constant temperature furnace wraps the external side of an equal-diameter mixing tube; each of two ends of the mixing tube is provided with a cooling jacket and a gas protective pipe; the tube type constant temperature furnace is composed of a resistance wire, a ceramic and a heat insulating layer; the cooling jacket is composed of a tapered inner tube and a circular outer casing; the large-opening end of the tapered inner tube is communicated with one end of the mixing tube; a gap between the tapered inner tube and the circular outer casing is filled with cooling circulating water; the side wall of the circular outer casing is provided with a cooling water incoming pipe and a cooling water outgoing pipe; one end of each of the gas protective pipe is communicated with the small-opening end of the corresponding tapered inner tube, and the other ends of the gas protective pipes are provided with a flat window sheet or lens and a flat quartz window sheet respectively; and the side wall of each gas protective pipe is provided with a gas incoming pipe and a gas outgoing pipe, wherein the gas incoming pipe is provided with a needle valve, and the gas outgoing pipe is connected with the vacuum acquisition device. The mercury vapor pool has the advantages of simple structure and low in cost, and can produce high-strength and high-stability vacuum ultraviolet laser.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a four-wave frequency mixing mercury vapor pool adopting a tubular constant temperature furnace and a cooling sleeve. Background technique [0002] Vacuum ultraviolet laser (wavelength range 120-150nm) can be widely used in basic scientific research such as atomic molecules and condensed matter physics, and can also be used for high-sensitivity detection of various small organic molecules and even biological macromolecules, such as laser sputtering ionization mass spectrometry, ultraviolet Fluorescence detection. In recent years, the mass spectrometry sputtering effect of vacuum ultraviolet laser has attracted more and more attention because of the high single-photon energy of vacuum ultraviolet laser. With this light source, it is very possible to obtain mass spectral information of larger mass molecules. At the same time, the wavelength of the laser is shorter than...

AI Technical Summary

Problems solved by technology

The length of the four-wave mixing effect of the mercury vapor pool they used is 600mm. The mixing tube is a stainless steel tube bent downwards. The center of the tube is wrapped with a heating tape. Control function, it is difficult to ensure constant temperature effect; cooling is achieved through copper pipes with cooling water around both ends, but the condensation effect is poor

During the operation of the mercury vapor pools designed by these two research groups, the vacuum degree of mercury vapor at different positions cannot be known.

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