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Small jitter frequency stabilization method of four-frequency laser gyro

A four-frequency laser gyro and frequency stabilization technology, which is applied to Sagnac effect gyroscopes and other directions, can solve the problems of reducing the performance of four-frequency laser gyro

Inactive Publication Date: 2011-02-16
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The four-frequency laser gyro used light intensity difference to stabilize the frequency earlier. The principle is to stabilize the four-frequency laser gyro in the state where the left-handed and right-handed light intensity signals are equal. It is impossible for the process of conversion and amplification to be completely consistent with the left and right rotation light. What is more serious is that this non-uniformity will change with temperature, thus reducing the performance of the four-frequency laser gyro

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  • Small jitter frequency stabilization method of four-frequency laser gyro
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  • Small jitter frequency stabilization method of four-frequency laser gyro

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0019] exist figure 1 Among them, the four-frequency laser gyroscope has four oscillation modes located within the light-emitting bandwidth of the gain curve 49, and their frequencies are f 1 , f 2 , f 3 , f 4 , with magnitudes of A 1 、A 2 、A 3 、A 4 , where modes 1 and 2 constitute a left-handed top, modes 3 and 4 constitute a right-handed top, modes 1 and 4 operate in a clockwise (CW) direction, and modes 2 and 3 operate in an anticlockwise (AW) direction. Since modes 1 and 2 are very close, the magnitudes of the two are basically the same, so there is A 1 =A 2 , similarly we know that A 3 =A 4

[0020] The following is an example of the principle of frequency stabilization by using a beam running in a clockwise direction. The average frequency of the four modes is f a , the beat frequency amplitude 50 of modes 1 and 4 is I=A 1 ...

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Abstract

When a four-frequency laser gyro adopts light intensity difference for frequency stabilization, accuracy thereof is easily influenced by parameter variation in light combination, photoelectric conversion and amplification processes. The invention discloses a novel frequency stabilization mode, small jitter modulation is carried out on path length of the four-frequency laser gyro, and then frequency stabilization is carried out according to the modulation condition of four-frequency laser gyro intracavity travelling wave mode amplitude, so that the four-frequency laser gyro operates under the condition that homonymous travelling wave mode beat-wave amplitude is maximum. The invention can solve problems which are caused when light intensity difference is adopted for frequency stabilization, and performance of four-frequency laser gyro is improved while the four-frequency laser gyro operates in unique uninterrupted state.

Description

technical field [0001] The invention relates to a four-frequency laser gyro, in particular to a frequency stabilization method for a four-frequency laser gyro. Background technique [0002] The laser gyroscope has the advantages of large dynamic range, no acceleration effect, simple structure, and small size. It is an ideal component for inertial systems, especially strapdown inertial systems, and has been widely used in military and civilian fields. The principle of the laser gyroscope is the Sagnac effect, and at least one pair of counterpropagating light waves run in its optical resonant cavity. When it rotates around the sensitive axis relative to the inertial space, the frequency of the opposite traveling waves splits to form a beat frequency proportional to the rotation rate, so the rotation information of the laser gyroscope relative to the inertial space can be obtained by measuring the beat frequency. [0003] Due to the energy coupling between opposing traveling w...

Claims

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Application Information

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IPC IPC(8): G01C19/68G01C19/64
Inventor 龙兴武王飞汪之国
Owner NAT UNIV OF DEFENSE TECH
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