Non-linear interferometer based on optical parameter process

Abstract

The invention discloses a non-linear interferometer based on optical parameter process. The non-linear interferometer comprises a laser, a first half-wave plate, a second half-wave plate, a third half-wave plate, a first polarized beam splitter, a second polarized beam splitter, an acousto-optic modulation device, a first glan-laser polarizer, a second glan-laser polarizer, a first rubidium pool and a second rubidium pool.Pump light outputted by the laser is transformed to be probe light, second vertical polarised light and third vertical polarised light. The light and the second vertical polarised light are subjectd to four-wave mixing in the first rubidium pool in order to form first probe light and first conjugate light. The second vertical polarised light, the first probe light and the first conjugate light are subjected to four-wave mixing in the center of the second rubidium pool for outputting the first probe light and second conjugate light. The non-linear interferometer based on optical parameter process has following beneficial effects: nondegenerate four-wave mixing process of the nondegenerate four-wave mixing is utilized to generate a beam splitter and a beam-combining device replacing a conventional interferometer and the comparison ratio of interference fringes can be up to 99% around.

Description

technical field [0001] The invention belongs to the technical field of precision measurement, in particular to a nonlinear interferometer based on an optical parameter process. Background technique [0002] In the field of precision measurement, optical interferometer is an effective means. For example, the Mach-Zehnder interferometer is now the core part of the gravitational wave detection system (Gravitational-Wave Observatory). Interferometers are often used to measure phase changes, and the measurement accuracy of phase changes has always been a challenge for scientists. At the input end of the interferometer, vacuum noise fluctuations bring a measurement accuracy limit to the phase measurement, which is called the standard quantum limit (StandardQuantumLimit), also known as the shot noise limit (ShotNoiseLimit). In 1981, C.M. Caves pointed out in his paper that if the non-classical light source such as squeezed light is used as the input of the interferometer, the sys...

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Problems solved by technology

However, such interferometers are very sensitive to losses from outside or inside the interferometer

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