Perpendicular coupling nanometer optical waveguide dual-optical-path chip atomic clock

Abstract

The invention discloses a perpendicular coupling nanometer optical waveguide dual-optical-path chip atomic clock which comprises a laser, light beams emitted by the laser enter a Y waveguide beam splitter through coupling of a perpendicular coupling optical grating I, one beam of light is output after passing by a phase modulation unit, another beam of light is output after regulation compensation, the two beams of light are output after passing by the perpendicular coupling optical grating I and a perpendicular coupling optical grating II respectively, enter a rubidium atom air chamber after passing by a polarizing film, an attenuation plate and a wave plate and after collimation and focussing and are input into an integrated circuit chip by a subtracter after emitted and converted into electrical signals by a detection unit, and the integrated circuit chip controls the laser and the phase modulation unit. According to the scheme, luminous power fluctuation and frequency fluctuation noise influences can be reduced greatly through dual-optical-path common-mode rejection, the signal-to-noise ratio of a CPT atomic clock is effectively improved, and accordingly, the short period stability of a chip level atomic clock can be improved greatly.

Description

technical field [0001] The invention belongs to the field of optics and the field of micro-nano systems, in particular to a chip-level atomic clock with vertical coupling nano-optical waveguide dual optical paths based on the CPT effect. Background technique [0002] As a new type of atomic frequency standard, the chip atomic clock based on the CPT principle can ensure the relative position measurement and precise time synchronization between satellites in the mobile communication constellation. At present, major foreign research institutes and companies have invested energy in developing new structures and new processes of CSAC in order to further reduce the volume and reduce power consumption. It can be seen from foreign research results that the current development performance parameters of chip atomic clocks basically meet some application requirements, and commercial chip atomic clock products have been developed, and great progress has been made. It is difficult to fu...

AI Technical Summary

Problems solved by technology

Although the influence of optical frequency noise fluctuation can be greatly reduced by locking the VCSEL laser to the transition line of the atom, the optical frequency fluctuation noise is still very large

Second, in some VCSELs, mode competition noise between different polarization modes can cause large amplitude noise on the detector

All this noise degrades the short-term frequency stability of chip-scale atomic clocks, leading to the current use of 1mm 3 The best second-order stability achieved by the chip atomic clock in the gas chamber is at 10 -11 magnitude

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