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Optical rotary Doppler frequency converter

A Doppler frequency and converter technology, applied in the field of optical rotating Doppler frequency converters, can solve the problems of poor beam properties, low efficiency, large loss, etc., and achieve the effect of light size and high adjustment accuracy

Inactive Publication Date: 2017-07-04
XI AN JIAOTONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the rough surface will inevitably introduce random fluctuations (noise), which will turn the output signal into a broadened signal centered at a certain frequency shift, which will deteriorate the properties of the beam, and the rough surface will cause light scattering, resulting in too much loss and low efficiency.

Method used

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0028] In a beam of Laguerre-Gaussian (LG) mode, each photon can carry an orbital angular momentum (OAM) of l, where l can take any integer. Macroscopically, photon orbital angular momentum (OAM) behaves as a transverse spatial distribution pattern of the light field, and its equiphase plane presents a spiral change along the propagation direction of the beam, so that there is a small angle α between the direction of the optical axis and the Poynting vector =lλ / (2πr), r is the distance from a point on the equiphase plane to the optical axis. Therefore, when there is a relative angular velocity Ω between a vortex light source with orbital angular momentum l and the observer, the received light will have a frequency shift:

[0029]

[0030] It can be seen from the formula that the frequency shift has nothing to do with r, which means that the Laguerre-Gauss...

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Abstract

An optical rotary Doppler frequency converter comprises a motion spiral phase plate and a static spiral phase plate which are relatively arranged, and a lens barrel for light transmission is arranged between the motion spiral phase plate and the static spiral phase plate; the motion spiral phase plate is connected with a driving device capable of changing the rotation direction and rotation speed of the motion spiral phase plate, and the static spiral phase plate employs a spiral phase plate being the same as the motion spiral phase plate; and light passes through the motion spiral phase plate to convert to Laguerre-Guess light form Guess light, and then passes through the static spiral phase plate to recover to a mode prior to conversion, and under the action of the Rotation type of Doppler effect, the frequency of the emergent light is changed. The optical rotary Doppler frequency converter does not relates to diffraction in the whole course, has no any influence on the propagation direction, and is small in fixed loss and continuously adjustable in frequency shift amount.

Description

technical field [0001] The invention relates to an optical instrument, in particular to an optical rotary Doppler frequency converter. Background technique [0002] An optical frequency converter is a device that can change the frequency of light. The existing optical frequency converters include: acousto-optic modulators, electro-optic modulators, optical Doppler converters, etc., among which the first two frequency converter technologies are relatively mature. [0003] The working principle of the acousto-optic modulator is to use the ultrasonic wave to cause the periodic refractive index change of the medium to form a phase grating. When a laser beam is incident, the first-order diffracted light whose frequency changes with the ultrasonic wave can be obtained. This method of modulating the frequency of light waves with the frequency of sound waves is called acousto-optic modulation. However, the acousto-optic modulation process produces a diffraction angle, which in tur...

Claims

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Application Information

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IPC IPC(8): G02B26/00
CPCG02B26/002
Inventor 张沛王晨辉贾俊亮李其昌
Owner XI AN JIAOTONG UNIV
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