Active atomic clock of sapphire resonant cavity and method for fabricating resonant cavity

Abstract

The invention discloses an active atomic clock of a sapphire resonant cavity and a method for fabricating the resonant cavity. The active atomic clock of the sapphire resonant cavity comprises the sapphire resonant cavity, the ratio of the radius b of the outer wall of a sapphire cylinder of the sapphire resonant cavity to the radius a of the wall of an outer metal cavity cylinder is that rho 1 is not less than 0.5 and not more than 0.56; the radius a of the wall of the outer metal cavity cylinder is that a is not less than 85mm and not more than 87.5mm; the radius b of the outer wall of the sapphire cylinder is that b is not less than 42.5mm and not more than 47.6mm; and the radius c of the inner wall of the sapphire cylinder is that c is not less than 36.68mm and not more than 40.6mm, and the height of the cylinder is equal to 162.9mm. SrTiO3 circular rings with the thickness of 2mm are respectively formed on the upper end surface and the lower end surface of the sapphire cavity cylinder of the sapphire resonant cavity. The size of the sapphire resonant cavity is calculated through sapphire resonant cavity and finite software simulation analysis, thereby realizing the maser self-excited oscillations of the sapphire resonant cavity and effectively reducing the volume and the quality of the active hydrogen atomic clock. Furthermore, the temperature drift coefficient of the sapphire resonant cavity can be also reduced.

Description

technical field [0001] The invention relates to a hydrogen atomic clock, in particular to a sapphire resonant cavity active hydrogen atomic clock related to time-frequency technology. Background technique [0002] With the development of my country's space orbit determination technology, more and more high-precision time-frequency equipment is needed by military industry and scientific research units. Hydrogen atomic clocks have become the mainstream high-precision time-frequency equipment for ground station applications due to their excellent medium and long-term stability. Hydrogen atomic clocks are divided into active type and passive type according to whether they can realize maser oscillation. The traditional active atomic clock (commonly known as the "big clock" SOHM-4 is the latest model of this clock) and the sapphire-filled dielectric active atomic clock are both active atomic clocks that can realize maser self-oscillation. [0003] However, the traditional active...

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Problems solved by technology

[0006] But the disadvantage of sapphire resonator is that the dielectric constant of sapphire crystal changes with temperature, so the temperature coefficient of sapphire cavity is very high.

Moreover, the dielectric constant of sapphire has a relatively large drift with temperature, so the temperature drift coefficient of the resonator is relatively large (50kHz-70KHz)

These can affect the long-term stability of the sapphire resonator

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