Hollow-photon-crystal-fiber gas absorbing pool and manufacturing method thereof

Abstract

Disclosed is a hollow-photon-crystal-fiber gas absorbing pool and a manufacturing method thereof. The absorbing pool includes a single-mode fiber, a fiber fusion protective sleeve, a hollow photon crystal fiber and a photoelectric detector. One end of the single-mode fiber is fused with one end of the hollow photon crystal fiber so that a fusion joint is formed and an end of a sealing hollow-photon-crystal-fiber gas absorbing pool is formed. The fiber fusion protective sleeve protects the fusion joint in a coverage manner. The hollow-photon-crystal-fiber gas absorbing pool is characterized in that the other end of the hollow photon crystal fiber is processed into an output end in a fusion sealing manner. An output end face faces, but is not parallel to, a detection face of the photoelectric detector. The hollow-photon-crystal-fiber gas absorbing pool effectively overcomes a background noise problem of transmitting light of the prior hollow-photon-crystal-fiber gas absorbing pools and has the characteristics of being small in size, light in weight and high in stability.

Description

technical field [0001] The invention relates to a gas absorption cell, in particular to a hollow photonic crystal fiber gas absorption cell and a manufacturing method thereof. Background technique [0002] In the fields of gas absorption spectrum analysis, laser frequency stabilization, and cold atomic clocks, a laser with a specific frequency and high frequency stability is required. Using gas absorption lines as a frequency reference to stabilize frequency is a method to realize this laser. [0003] The gas absorption cell is one of the necessary components to use the gas absorption line as a frequency reference to achieve laser frequency stabilization. For some gases with relatively weak absorption intensity, a longer distance for the interaction between light and gas is required. In addition, especially for spaceborne, airborne, and vehicle-mounted applications, there are requirements for weight and shock resistance of frequency-stabilized lasers. Therefore, the gas abs...

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Problems solved by technology

But this solution has the following problems: Since the welding end face is vertical, the end face will form a significant Fresnel reflection

In the process of use, due to the limitation of the process, the mode interference leads to the continuous change of the center of mass of the spot

[0006] For the prior art (see [1][2][3]), the output end of the hollow photonic crystal fiber is used to splice or butt the ordinary fiber, because the fiber core aperture size is limited, which is equivalent to introducing a Spatial filter, this spatial filter will cause additional background oscillations, causing frequency stabilization performance to deteriorate

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