阅读说明：本技术 一种基于pzt的光学频率梳重频控制装置 (Optical frequency comb repetition frequency control device based on PZT ) 是由 陈大勇 杨瑞强 代虎 王猛 刘志栋 陈江 崔敬忠 王宽 卫立勋 于 2021-08-12 设计创作，主要内容包括：本发明公开了一种基于PZT的光学频率梳重频控制装置,包括重频高速控制模块和重频低速控制模块,根据光梳重频波动特性,选择不同谐振频率的PZT,可实现低速、高速相结合的重频控制,重频控制过程中同时对模块工作温度进行精确控制,可对重频的频率进行大范围调整,本发明从光纤拉伸和工作温度两方面进行控制,拓宽重频控制范围,提高了系统的环境适应性和可靠性。(The invention discloses an optical frequency comb repetition frequency control device based on PZT, which comprises a repetition frequency high-speed control module and a repetition frequency low-speed control module, PZT with different resonance frequencies are selected according to the fluctuation characteristic of optical comb repetition frequency, so that the low-speed and high-speed combined repetition frequency control can be realized, the working temperature of the module is accurately controlled in the repetition frequency control process, and the repetition frequency can be adjusted in a large range.)

1. An optical frequency comb repetition frequency control device based on PZT is characterized by comprising a repetition frequency high-speed control module and a repetition frequency low-speed control module, wherein PZT with different resonant frequencies are selected to control the stretching amount of an optical fiber according to the fluctuation characteristic of optical comb repetition frequency, so that the repetition frequency control combining low speed and high speed is realized; and controlling the working temperature of the control module in the repetition frequency control process so as to adjust the repetition frequency.

2. The PZT-based optical frequency comb repetition frequency control device of claim 1, wherein the repetition frequency high-speed control module comprises epoxy, a fastening bolt, a first substrate, a second substrate, an optical fiber, and a high-frequency resonant frequency PZT;

the first substrate and the second substrate are arranged side by side on the same horizontal plane and connected through fastening bolts, the lower surface of the high-frequency resonant frequency PZT is fixed on the fastening bolts through epoxy resin in a sticking mode, the upper surface of the high-frequency resonant frequency PZT and the upper surface of the substrate are located on the same plane, and the optical fiber is fixed on the upper surface of the substrate through epoxy resin.

3. The PZT-based optical frequency comb repetition frequency control device of claim 1, wherein the repetition frequency low speed control module comprises an epoxy, a fastening bolt, a first substrate, a second substrate, an optical fiber, and a low frequency resonant frequency PZT;

the first substrate and the second substrate are arranged side by side on the same horizontal plane and are connected through the fastening bolt, the lower surface of the low-frequency resonant frequency PZT is fixed on the fastening bolt through epoxy resin in a sticking mode, the distance from the upper surface of the low-frequency resonant frequency PZT to the upper surface of the substrate is 1/3 with the height of the low-frequency resonant frequency PZT, and the optical fiber is fixed on the upper surface of the substrate through epoxy resin.

4. The PZT-based optical frequency comb repetition frequency control device of claim 1, wherein the operating temperature fluctuation is less than 0.1 ℃ and the temperature coefficient is 500Hz/° c during repetition frequency control.

5. The PZT-based optical frequency comb repetition frequency control device according to claim 2, wherein the high-frequency resonant frequency PZT is controlled by an external feedback high-frequency control voltage signal to extend and retract in a direction perpendicular to an upper surface thereof, so as to drive the optical fiber to stretch, thereby realizing high-speed control of repetition frequency.

6. The PZT-based optical frequency comb repetition frequency control device as claimed in claim 3, wherein the low frequency resonant frequency PZT is extended and contracted in a direction perpendicular to an upper surface thereof by controlling an external feedback low frequency control voltage signal to drive the optical fiber to be stretched, thereby realizing the low speed control of the repetition frequency.

Technical Field

The invention belongs to the technical field of optical frequency combs, and particularly relates to an optical frequency comb repetition frequency control device based on PZT.

Background

Optical frequency combs (optical combs for short) are regarded as a major breakthrough in the field of laser technology since birth, and two scientists, j.l.hall and t.w.hansch, have pioneered research work on optical combs, so that the measurement precision and application field of optical combs are greatly improved and expanded, and the nubel prize of physics in 2005 is obtained.

The optical comb is a spectrum consisting of a series of frequency components which are uniformly spaced and have coherent and stable phase relations, is equivalent to an optical frequency comprehensive generator, is the most effective technical means for absolute optical frequency measurement so far, provides an ideal research tool for the fields of precise spectrum, physical constant measurement, astronomy physics, quantum control and the like, is more and more emphasized and applied in the fields of optical frequency precise measurement, atomic particle energy level transition measurement, remote signal transmission, clock synchronization, satellite navigation and the like, and develops a plurality of new research directions and hot spots.

The key technology of the optical comb comprises the following steps: the method comprises a mode locking technology, a high-stability repetition frequency measurement and locking technology and a carrier envelope phase signal detection and locking technology. The mode locking technology is used for generating a periodic optical pulse sequence; the repetition frequency measurement and locking technology is used for inhibiting interval jitter noise of comb teeth of the optical comb, so that an optical pulse sequence with high stable repetition frequency is obtained; carrier envelope phase signal detection and locking techniques are used for carrier envelope offset frequency locking.

Disclosure of Invention

In view of the above, the present invention provides an optical frequency comb repetition frequency control device based on PZT (Piezoelectric ceramics) for precise control and locking of repetition frequency.

The technical scheme for realizing the invention is as follows:

an optical frequency combing and repeating frequency control device based on PZT comprises a repeating frequency high-speed control module and a repeating frequency low-speed control module, wherein PZT with different resonant frequencies are selected to control the stretching amount of an optical fiber according to the fluctuation characteristic of the optical combing and repeating frequency, so that the low-speed and high-speed combined repeating frequency control is realized; and controlling the working temperature of the control module in the repetition frequency control process so as to adjust the repetition frequency.

Further, the repetition frequency high-speed control module comprises epoxy resin, a fastening bolt, a first substrate, a second substrate, an optical fiber and high-frequency resonant frequency PZT;

the first substrate and the second substrate are arranged side by side on the same horizontal plane and connected through fastening bolts, the lower surface of the high-frequency resonant frequency PZT is fixed on the fastening bolts through epoxy resin in a sticking mode, the upper surface of the high-frequency resonant frequency PZT and the upper surface of the substrate are located on the same plane, and the optical fiber is fixed on the upper surface of the substrate through epoxy resin.

Further, the repetition frequency low-speed control module comprises epoxy resin, a fastening bolt, a first substrate, a second substrate, an optical fiber and low-frequency resonant frequency PZT;

the first substrate and the second substrate are arranged side by side on the same horizontal plane and are connected through the fastening bolt, the lower surface of the low-frequency resonant frequency PZT is fixed on the fastening bolt through epoxy resin in a sticking mode, the distance from the upper surface of the low-frequency resonant frequency PZT to the upper surface of the substrate is 1/3 with the height of the low-frequency resonant frequency PZT, and the optical fiber is fixed on the upper surface of the substrate through epoxy resin.

Furthermore, the fluctuation of the working temperature is less than 0.1 ℃ in the process of repetition frequency control, and the temperature coefficient is 500 Hz/DEG C.

Furthermore, the high-frequency resonant frequency PZT is controlled by an external feedback high-frequency control voltage signal to stretch in the direction vertical to the upper surface of the PZT so as to drive the optical fiber to stretch, thereby realizing the high-speed control of the repetition frequency.

Furthermore, the low-frequency resonant frequency PZT is controlled by an external feedback low-frequency control voltage signal to stretch in the direction vertical to the upper surface of the PZT so as to drive the optical fiber to stretch, thereby realizing the low-speed control of the repetition frequency.

Has the advantages that:

according to the design of the PZT-based optical frequency comb repetition frequency control device, PZT with different resonant frequencies are selected according to the fluctuation characteristic of the optical frequency comb repetition frequency, low-speed and high-speed combined repetition frequency control can be realized, the working temperature of a control module is accurately controlled in the repetition frequency control process, the technical scheme controls the repetition frequency from two dimensions of optical fiber stretching amount and the working temperature, the wide range of repetition frequency control is widened, and the environmental adaptability and the reliability of the system are improved.

Drawings

Fig. 1 is a front view of a repetition frequency narrow-range high-speed control module.

Fig. 2 is a front view of a repetition frequency wide-range low-speed control module.

Fig. 3 is a bottom view of the repetition rate control module.

Fig. 4 fiber-locked laser solution.

The optical fiber module comprises 1-epoxy resin, 2-epoxy resin, 3-epoxy resin, 4-epoxy resin, 5-epoxy resin, 6-fastening bolts, 7-a first substrate, 8-optical fibers, 9-high-frequency resonant frequency PZT, 10-a second substrate, 11-an installation aperture, 12-a reserved aperture and 13-low-frequency resonant frequency PZT.

Detailed Description

The invention is described in detail below by way of example with reference to the accompanying drawings.

The invention provides an optical frequency comb repetition frequency control device based on PZT, which comprises a repetition frequency high-speed control module and a repetition frequency low-speed control module;

the repetition frequency high-speed control module comprises epoxy resin 1, epoxy resin 2, epoxy resin 3, epoxy resin 4, epoxy resin 5, a fastening bolt 6, a first substrate 7, a second substrate 10, an optical fiber 8 and high-frequency resonant frequency PZT 9. As shown in fig. 1 and 3, the first substrate 7 and the second substrate 10 are used for supporting and fixing the optical fiber 8 and PZT9, and are made of aluminum, and specifically include that the optical fiber 8 is fixed on the upper surfaces of the first substrate 7 and the second substrate 10 through epoxy resin 1 and epoxy resin 3; the fastening bolt 6 is based on the reserved threads in the mounting hole diameter 11, and the fastening bolt 6 is rotated to control the upper surface of the PZT9 to be on the same plane with the upper surfaces of the first substrate 7 and the second substrate 10; injecting epoxy resin 4 into the joint of the PZT9 and the fastening bolt 6 through the reserved aperture 12, so that one end of the PZT9 is fixed on the fastening bolt 6; PZT9 is adhered to the optical fiber 8 through epoxy resin 2, PZT9 is controlled by an external high-frequency voltage signal, and is stretched in the Z-axis direction to drive the optical fiber to stretch, so that the repetition frequency high-speed control is realized; injecting epoxy resin 5 into the mounting hole diameter 11 reserved in the substrate to fix the fastening bolt 6 in the mounting hole diameter 11;

the repetition frequency low-speed control module comprises epoxy resin 1, epoxy resin 2, epoxy resin 3, epoxy resin 4, epoxy resin 5, a fastening bolt 6, a first substrate 7, a second substrate 10, an optical fiber 8 and low-frequency resonant frequency PZT 13. As shown in fig. 2 and 3, the first substrate 7 and the second substrate 10 are used for supporting and fixing the optical fiber 8 and PZT13, and are made of aluminum, and specifically include that the optical fiber 8 is fixed on the upper surfaces of the first substrate 7 and the second substrate 10 through epoxy resin 1 and epoxy resin 3; the fastening bolt 6 is based on the reserved threads in the mounting hole 11, the fastening bolt 6 is rotated to control the PZT13, the distance from the upper surface of the PZT13 to the upper surfaces of the first substrate 7 and the second substrate 10 is 1/3 of the height of the PZT13, enough bending amount is reserved for the optical fiber 8, and stress is reduced; injecting epoxy resin 4 into the joint of the PZT13 and the fastening bolt 6 through the reserved aperture 12, so that one end of the PZT13 is fixed on the fastening bolt 6; PZT13 is adhered to the optical fiber 8 through epoxy resin 2, PZT13 is controlled by an external low-frequency voltage signal to be stretched in the Z-axis direction to drive the optical fiber to be stretched, so that the low-speed adjustment of the counterweight bandwidth range is realized; epoxy resin 5 is injected into the mounting hole 11 reserved in the substrate, so that the fastening bolt 6 is fixed in the mounting hole 11.

The method comprises the following specific implementation steps:

a. in the embodiment, the optical comb mode-locked laser adopts a fiber mode-locked laser based on nonlinear polarization rotation, and the technical scheme is as shown in fig. 4, wherein the repetition frequency is 103MHz, the cavity length is about 2m, and the refractive index of the fiber is 1.5. Through tests, the repetition frequency fluctuation is mainly influenced by the ambient temperature and vibration, wherein the temperature coefficient is about 500 Hz/DEG C;

b. in the embodiment, the bandwidth of the repetition frequency high-speed control module is set to be 50kHz, and the repetition frequency fluctuation between 1kHz and 50kHz is compensated. Selecting a stack PZT with a resonance frequency of 500kHz, wherein the size is 2mm multiplied by 2mm, and the Z-axis displacement is 3.3 um; the thickness of the substrate is 300mm, and the material is duralumin. The mounting hole diameter 11 is a square through hole with the diameter of 2.2mm multiplied by 2.2mm reserved for the substrate, the mounting hole diameter is provided with threads, the position of the PZT9 on the hole diameter 11 can be controlled by rotating the fastening bolt 6, the upper surface of the PZT9 and the upper surface of the substrate are in the same plane, and the optical fiber 4 is tightly attached to the PZT9 and the upper surface of the substrate; the epoxy resin is used for reinforcing the device, so that the reliability is improved, the reinforcement comprises the steps that the optical fiber 8 is fixed on the substrate, the upper surface of the PZT9 is adhered to the optical fiber 4, one end of the PZT9 is adhered to the fastening bolt 6, and the fastening bolt 6 is fixed in the mounting aperture 11; the repetition frequency high-speed control PZT9 controls the PZT9 to stretch in the Z-axis direction by feeding back a high-frequency control voltage signal from the outside to drive the optical fiber to stretch, so that the repetition frequency high-speed control is realized, the frequency compensation quantity is determined by the amplitude of the control voltage and is generally less than 1 Hz;

c. in the embodiment, the bandwidth of the repetition frequency wide-range low-speed control module is set to be 1kHz, and the repetition frequency fluctuation within 1kHz is compensated. The stack PZT with the resonance frequency of 100kHz is selected, the size is 2mm multiplied by 10mm, and the displacement in the Z-axis direction is about 15 um; the thickness of the substrate is 300mm, and the material is duralumin. The mounting hole diameter 11 is a square through hole with the diameter of 2.2mm multiplied by 2.2mm reserved for the substrate, the mounting hole diameter is provided with threads, the position of the PZT in the hole diameter 11 can be controlled by rotating the fastening bolt 6, and the distance from the upper surface of the substrate to the upper surface of the PZT13 is about 4 mm; the epoxy resin is used for reinforcing the device, reliability is improved, and the reinforcement comprises the optical fiber 8 fixed on the substrate, the PZT13 upper surface is adhered to the optical fiber 4, and the design reserves enough bending amount for the optical fiber 8, so that stress is reduced. One end of the PZT13 is adhered to the fastening bolt 6, and the fastening bolt 6 is fixed in the mounting aperture 11; the repetition frequency low-speed control is that PZT13 controls PZT13 to stretch in the Z-axis direction by feeding back a low-frequency control voltage signal from the outside to drive the optical fiber to stretch, thereby realizing the repetition frequency low-speed control and compensating the repetition frequency fluctuation caused by factors such as environment temperature, vibration and the like; the repetition frequency control module controls the working temperature fluctuation to be less than 0.1 ℃ and the repetition frequency fluctuation to be less than 50Hz through temperature control. In the design, the frequency compensation quantity of the repetition frequency wide-range low-speed control module is not less than 200Hz, so that the application requirement is completely met;

d. in the embodiment, the working temperature of the control module is accurately controlled in the repetition frequency control process, the working temperature fluctuation is less than 0.1 ℃, the temperature coefficient is about 500 Hz/DEG C, the working temperature of the module is accurately controlled, the frequency of repetition frequency is adjusted in a large range, the wide range of repetition frequency control is widened, and the environmental adaptability and the reliability of the system are improved.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.