CN111912608A - Test method and device for vibration sensitivity of transportable optical reference cavity - Google Patents

Test method and device for vibration sensitivity of transportable optical reference cavity Download PDF

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CN111912608A
CN111912608A CN202010584604.0A CN202010584604A CN111912608A CN 111912608 A CN111912608 A CN 111912608A CN 202010584604 A CN202010584604 A CN 202010584604A CN 111912608 A CN111912608 A CN 111912608A
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reference cavity
optical reference
laser
acousto
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CN111912608B (en
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陈龙
刘涛
江晨晖
焦东东
张林波
许冠军
范乐
董瑞芳
张首刚
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National Time Service Center of CAS
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    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract

本发明提供了一种可搬运光学参考腔振动敏感度的测试方法及装置,利用腔稳窄线宽激光器系统中光学参考腔共振峰与激光频率的对应关系,通过声光调制器周期性扫频的方式得到光学参考腔颠倒前后共振峰与声光调制器三角波扫频信号的位置关系,进而得出2g加速度变化情况下参考腔共振频率的变化值,测量出参考腔的振动敏感度。本发明方便快捷,能够降低操作复杂程度和设备成本。

Figure 202010584604

The invention provides a method and device for testing the vibration sensitivity of a transportable optical reference cavity. The corresponding relationship between the resonance peak of the optical reference cavity and the laser frequency in the cavity-stabilized narrow linewidth laser system is used to periodically sweep the frequency through an acousto-optic modulator. The positional relationship between the resonant peak of the optical reference cavity and the triangular wave frequency sweep signal of the acousto-optic modulator can be obtained by means of the method, and then the change value of the resonant frequency of the reference cavity under the change of 2g acceleration is obtained, and the vibration sensitivity of the reference cavity is measured. The invention is convenient and quick, and can reduce the complexity of operation and the cost of equipment.

Figure 202010584604

Description

一种可搬运光学参考腔振动敏感度的测试方法及装置A method and device for testing vibration sensitivity of a transportable optical reference cavity

技术领域technical field

本发明属于光学参考腔领域,涉及一种振动敏感度测试方法,尤其适用于可搬运光学参考腔的振动敏感度测试。The invention belongs to the field of optical reference cavity and relates to a vibration sensitivity test method, which is especially suitable for vibration sensitivity test of a transportable optical reference cavity.

背景技术Background technique

具有极高频率稳定度的窄线宽激光器作为高精密测量的一种手段,在基本物理常数测量、引力波探测、测地学、原子光钟等科学与技术领域有着广泛的应用。提高激光频率稳定度及压窄激光线宽的方法有多种,其中基于光学参考腔的 Pound-Drever-Hall(PDH)稳频技术是实现超窄线宽激光器最常用的方法之一。该方法将相位调制光谱技术与光外差探测技术结合,把激光频率精密锁定在光学参考腔的共振频率上,具有鉴频信号强、中心频率处斜率大、控制范围宽等特点。由于光学参考腔是窄线宽激光器的频率参考,其长度稳定性直接决定了窄线宽激光器的频率稳定性。基于超稳光学参考腔实现的超稳激光的频率稳定性已经达到10-17量级,也就是参考腔的长度稳定性已经达到了10-17量级。环境中不可避免的振动所导致的参考腔长度稳定性恶化已经成为限制超稳激光性能进一步提升的关键因素之一。因此快捷方便的测量光学参考腔的振动敏感度是进一步优化并提升系统稳定性的关键一环。As a means of high-precision measurement, narrow linewidth lasers with extremely high frequency stability are widely used in the fields of science and technology such as basic physical constant measurement, gravitational wave detection, geodesy, and atomic optical clocks. There are many methods to improve the laser frequency stability and narrow the laser linewidth. Among them, the Pound-Drever-Hall (PDH) frequency stabilization technology based on an optical reference cavity is one of the most commonly used methods to realize ultra-narrow linewidth lasers. The method combines phase modulation spectroscopy technology with optical heterodyne detection technology to precisely lock the laser frequency on the resonant frequency of the optical reference cavity. Since the optical reference cavity is the frequency reference of the narrow linewidth laser, its length stability directly determines the frequency stability of the narrow linewidth laser. The frequency stability of the ultra-stable laser based on the ultra-stable optical reference cavity has reached the order of 10-17, that is, the length stability of the reference cavity has reached the order of 10-17. The deterioration of the reference cavity length stability caused by the inevitable vibration in the environment has become one of the key factors limiting the further improvement of ultra-stable laser performance. Therefore, the quick and convenient measurement of the vibration sensitivity of the optical reference cavity is a key link to further optimize and improve the stability of the system.

光学参考腔振动敏感度是指光学参考腔的长度对振动的敏感程度,即一定幅值的加速度振动导致的参考腔长度的相对变化。由于光学参考腔通常安装与真空腔室内,且其长度的变化已经达到10-18m,无法对该长度变化进行直接测量。通常是对待测光学参考腔施加一定幅值的加速度振动,通过拍频比对的方式测量该振动导致的锁定于待测光学参考腔的激光频率变化,进而计算出参考腔腔长的相对变化。光学参考腔振动敏感度测量的一般方法是,首先将激光器输出激光锁定于一个超稳光学参考腔的共振频率,得到一束频率稳定的激光作为参考激光;其次将另一台激光器输出激光锁定于待测光学参考腔的共振频率,得到待测激光;然后人为的对待测光学参考腔施加一定幅度的加速度扰动,测量该加速度扰动导致的两束激光拍频频率的变化,从而计算出待测光学参考腔的振动敏感度。该方法一般包含两台激光器、两套锁频系统、两个光学参考腔、一套移频系统、一套拍频系统、一套加速度激励及测试系统和一套频率测试系统。如2007年S.A.Webster,M.Oxborrow和P.Gill等人(PHYSICAL REVIEW A 75,011801,2007)利用此方法对特殊切割设计的光学参考腔的振动敏感度进行了测量。The vibration sensitivity of the optical reference cavity refers to the sensitivity of the length of the optical reference cavity to vibration, that is, the relative change of the length of the reference cavity caused by the acceleration vibration of a certain amplitude. Since the optical reference cavity is usually installed in a vacuum chamber, and its length change has reached 10-18m, it is impossible to directly measure the length change. Usually, acceleration vibration of a certain amplitude is applied to the optical reference cavity to be measured, and the change of the laser frequency locked to the optical reference cavity to be measured caused by the vibration is measured by means of beat frequency comparison, and then the relative change of the cavity length of the reference cavity is calculated. The general method of measuring the vibration sensitivity of an optical reference cavity is to first lock the output laser of the laser to the resonant frequency of an ultra-stable optical reference cavity, and obtain a laser with a stable frequency as the reference laser; The resonant frequency of the optical reference cavity to be measured is used to obtain the laser to be measured; then a certain amplitude of acceleration disturbance is artificially applied to the optical reference cavity to be measured, and the change of the beat frequency of the two laser beams caused by the acceleration disturbance is measured, so as to calculate the optical frequency to be measured. Vibration sensitivity of the reference cavity. The method generally includes two lasers, two frequency locking systems, two optical reference cavities, a frequency shifting system, a beat frequency system, an acceleration excitation and testing system, and a frequency testing system. For example, in 2007, S.A.Webster, M.Oxborrow and P.Gill et al. (PHYSICAL REVIEW A 75, 011801, 2007) used this method to measure the vibration sensitivity of a specially designed optical reference cavity.

为了简化光学参考腔振动敏感度测试系统,有学者将原来的两台激光器简化为一台激光器,将一台激光器输出激光分为两束,一束激光锁定于作为参考的光学参考腔,将另一束激光通过声光调制器移频后,锁定于待测光学参考腔的共振频率,其他部分不变,仍可实现对光学参考腔振动敏感度的测试。In order to simplify the optical reference cavity vibration sensitivity test system, some scholars simplified the original two lasers into one laser, divided the output laser of one laser into two beams, one laser was locked in the optical reference cavity as a reference, and the other After a laser beam is frequency-shifted by the acousto-optic modulator, it is locked to the resonant frequency of the optical reference cavity to be measured, and other parts remain unchanged, and the vibration sensitivity of the optical reference cavity can still be tested.

随着抗振型光学参考腔的发展,利用光学参考腔与重力加速度的相对关系,上下颠倒光学参考腔可以使光学参考腔产生2g加速度变化,结合上述加速度测试方法,可以实现对光学参考腔振动敏感度的测量,该方法能够减少一套加速度激励及测试系统。如2011年S.Webster,and P.Gill(“Force-insensitive optical cavity,”Opt.Lett.36 6,3572(2011))等人利用该方法对立方体参考腔的振动敏感度进行了测量。With the development of anti-vibration optical reference cavity, using the relative relationship between the optical reference cavity and the gravitational acceleration, upside down the optical reference cavity can make the optical reference cavity produce a 2g acceleration change. Combined with the above acceleration test method, the vibration of the optical reference cavity can be realized. Sensitivity measurement, this method can reduce a set of acceleration excitation and test system. For example, in 2011, S. Webster, and P. Gill (“Force-insensitive optical cavity,” Opt. Lett. 36 6, 3572 (2011)) et al. used this method to measure the vibration sensitivity of a cubic reference cavity.

综合以上方法,振动敏感度的测试至少需要一台激光器、一个作为参考的光学参考腔、一个待测光学参考腔、两套锁频系统、一套移频系统、一套拍频系统和一套频率测试系统。该振动敏感度测试系统仍然十分复杂,不仅操作困难,而且测试仪器所需费用昂贵。本专利将提出一种更加方便快捷的光学参考腔振动敏感度测试方法。Combining the above methods, the vibration sensitivity test requires at least one laser, an optical reference cavity as a reference, an optical reference cavity to be tested, two frequency locking systems, a frequency shifting system, a beat frequency system and a set of Frequency test system. The vibration susceptibility test system is still very complex, not only difficult to operate, but also expensive to test equipment. This patent will propose a more convenient and quick method for testing the vibration sensitivity of an optical reference cavity.

发明内容SUMMARY OF THE INVENTION

为了克服现有技术的不足,本发明提供一种可搬运光学参考腔振动敏感度的测试方法,利用腔稳窄线宽激光器系统中光学参考腔共振峰与激光频率的对应关系,通过声光调制器周期性扫频的方式得到光学参考腔颠倒前后共振峰与声光调制器三角波扫频信号的位置关系,进而得出2g加速度变化情况下参考腔共振频率的变化值,测量出参考腔的振动敏感度。本发明方便快捷,能够降低操作复杂程度和设备成本。In order to overcome the deficiencies of the prior art, the present invention provides a method for testing the vibration sensitivity of a transportable optical reference cavity, which utilizes the corresponding relationship between the resonance peak of the optical reference cavity and the laser frequency in the cavity-stabilized narrow-linewidth laser system, through acousto-optic modulation The positional relationship between the resonance peak of the optical reference cavity and the triangular wave frequency sweep signal of the acousto-optic modulator before and after the reversal of the optical reference cavity is obtained by means of the periodic frequency sweep of the device, and then the change value of the resonant frequency of the reference cavity under the change of 2g acceleration is obtained, and the vibration of the reference cavity is measured. sensitivity. The invention is convenient and quick, and can reduce the complexity of operation and the cost of equipment.

本发明解决其技术问题所采用的技术方案包括以下步骤:The technical scheme adopted by the present invention to solve its technical problem comprises the following steps:

步骤一,将光源输出的激光锁定于一个光学参考腔的共振频率,获得作为参考的稳频激光;Step 1, locking the laser output from the light source to the resonance frequency of an optical reference cavity to obtain a frequency-stabilized laser as a reference;

步骤二,将稳频激光进行移频后,耦合入待测光学参考腔;Step 2: After frequency-shifting the frequency-stabilized laser, it is coupled into the optical reference cavity to be measured;

步骤三,使用声光调制器改变移频频率,测量从待测光学参考腔后透射的激光光强,当透射激光光强最大时,激光与待测光学参考腔达到共振,此时声光调制器的驱动频率记为f0Step 3: Use the acousto-optic modulator to change the frequency shift frequency, and measure the laser light intensity transmitted from the optical reference cavity to be measured. When the transmitted laser light intensity is the largest, the laser and the optical reference cavity to be measured reach resonance, and the acousto-optic modulation The drive frequency of the device is recorded as f 0 ;

步骤四,将声光调制器的驱动信号源输出设置为周期性三角波,调制后输出的信号频率最小值为fmin,最大值为fmax,该频率范围覆盖f0;当驱动信号源从最小频率扫描至最大频率时,透射激光光强的最大值对应的频率为f1Step 4: Set the output of the driving signal source of the acousto-optic modulator as a periodic triangular wave, the minimum value of the output signal frequency after modulation is f min , the maximum value is f max , and the frequency range covers f 0 ; when the driving signal source is from the minimum When the frequency is scanned to the maximum frequency, the frequency corresponding to the maximum value of the transmitted laser light intensity is f 1 ;

步骤五,将待测光学参考腔上下颠倒,当驱动信号源从最小频率扫描至最大频率时,透射激光光强的最大值对应的频率为f2Step 5: Upside down the optical reference cavity to be measured, when the driving signal source scans from the minimum frequency to the maximum frequency, the frequency corresponding to the maximum value of the transmitted laser light intensity is f 2 ;

步骤六,将待测光学参考腔颠倒前后对应的频率做差,除以加速度变化量2g和激光的中心频率f的乘积,得到该光学参考腔的振动敏感度,即(f2-f1)/(2g*f)。Step 6: Make the difference between the corresponding frequencies before and after the inversion of the optical reference cavity to be tested, and divide it by the product of the acceleration change 2g and the center frequency f of the laser to obtain the vibration sensitivity of the optical reference cavity, namely (f 2 -f 1 ) /(2g*f).

本发明还提供一种实现上述方法的装置,包括激光器、伺服控制系统、光学参考腔、声光调制器、驱动信号源、光电探测器和示波器。The present invention also provides a device for implementing the above method, including a laser, a servo control system, an optical reference cavity, an acousto-optic modulator, a driving signal source, a photodetector and an oscilloscope.

所述的激光器的输出激光通过伺服控制系统锁定于光学参考腔的共振频率,将该激光器的输出激光通过声光调制器移频后耦合入待测光学参考腔,并由光电探测器检测透射出待测光学参考腔的激光;改变声光调制器的移频频率,当光电探测器输出电压最大时判定激光与待测光学参考腔达到共振,此时声光调制器驱动频率记为f0,并将光电探测器输出的电压信号连接到示波器的一个输入端;将声光调制器的驱动信号源输出设置为周期性三角波,调制后输出的信号频率最小值为fmin、最大值为fmax,该频率范围覆盖f0;将三角波信号输出至示波器的另一个输入端口;当信号源从最小频率扫描至最大频率后,在示波器上同时显示一个三角波信号和一个待测光学参考腔共振峰信号;将待测光学参考腔上下颠倒,在示波器上显示颠倒后的待测光学参考腔共振峰信号;根据两个共振峰信号计算待测光学参考腔的振动敏感度。The output laser of the laser is locked to the resonance frequency of the optical reference cavity by the servo control system, and the output laser of the laser is frequency-shifted by the acousto-optic modulator and then coupled into the optical reference cavity to be measured, and detected and transmitted by the photodetector. The laser of the optical reference cavity to be measured; change the frequency-shift frequency of the acousto-optic modulator, when the output voltage of the photodetector is at its maximum, it is determined that the laser and the optical reference cavity to be measured reach resonance, and the driving frequency of the acousto-optic modulator is denoted as f 0 , Connect the voltage signal output by the photodetector to an input end of the oscilloscope; set the output of the driving signal source of the acousto-optic modulator as a periodic triangular wave, the minimum value of the modulated output signal frequency is f min , and the maximum value is f max , the frequency range covers f 0 ; output the triangular wave signal to another input port of the oscilloscope; when the signal source sweeps from the minimum frequency to the maximum frequency, a triangular wave signal and a formant signal of the optical reference cavity to be tested are displayed on the oscilloscope at the same time ; Invert the optical reference cavity to be tested upside down, and display the inverted optical reference cavity formant signal on the oscilloscope; calculate the vibration sensitivity of the optical reference cavity to be tested according to the two formant signals.

本发明的有益效果是:由于采用声光调制器扫频的方式测量出待测光学参考腔颠倒前后共振信号在声光调制器扫频曲线中对应的频率,通过二者做差计算出2g加速度变化导致的参考腔共振频率变化,进而计算出该参考腔的振动敏感度,本发明比现有技术更加方便快捷,至少能够节省一套锁频系统、一套拍频系统、一套频率测试系统等装置,能够显著降低可搬运光学参考腔振动敏感度测试的经济成本和时间成本。The beneficial effects of the invention are as follows: because the frequency of the resonance signal before and after the reversal of the optical reference cavity to be tested is measured in the frequency sweep curve of the acousto-optic modulator, the 2g acceleration is calculated by making the difference between the two. The resonant frequency of the reference cavity caused by the change is changed, and then the vibration sensitivity of the reference cavity is calculated. The present invention is more convenient and quicker than the prior art, and at least one set of frequency locking system, one set of beat frequency system and one set of frequency testing system can be saved. Such devices can significantly reduce the economic cost and time cost of vibration sensitivity testing of transportable optical reference cavities.

附图说明Description of drawings

图1是S.A.Webster,M.Oxborrow,and P.Gill等人的测试原理图;Figure 1 is the test schematic diagram of S.A.Webster, M.Oxborrow, and P.Gill et al;

图2是本发明的测试原理图;Fig. 2 is the test principle diagram of the present invention;

图3是参考腔颠倒前后共振信号的频率关系示意图。FIG. 3 is a schematic diagram of the frequency relationship of the resonance signal before and after the reference cavity is inverted.

具体实施方式Detailed ways

下面结合附图和实施例对本发明进一步说明,本发明包括但不仅限于下述实施例。The present invention will be further described below with reference to the accompanying drawings and embodiments, and the present invention includes but is not limited to the following embodiments.

本发明通过以下技术方案来实现:The present invention realizes through the following technical solutions:

步骤一,将激光器输出激光通过伺服控制系统(锁频系统)锁定于光学参考腔1 的共振频率,获得作为参考的稳频激光Step 1: Lock the laser output laser to the resonance frequency of the optical reference cavity 1 through the servo control system (frequency locking system) to obtain a frequency-stabilized laser as a reference

步骤二,将该激光器输出激光分出一束,通过声光调制器移频后,耦合入待测光学参考腔2In step 2, the laser output laser is split into a beam, and after frequency shifting by the acousto-optic modulator, it is coupled into the optical reference cavity to be measured 2

步骤三,(利用光学参考腔的驻波效应,当激光频率与参考腔共振频率的差值小于参考腔线宽的一半时,激光能够在光学参考腔内较为明显的积聚,同时由于参考腔腔镜不是全反镜,有一部分激光从光学参考腔后透射,当透射激光光强最大,即光电探测器输出电压幅值最大时,激光与参考腔达到共振;)选择合适的声光调制器,改变声光调制器的移频频率,通过判断光学参考腔2后光电探测器输出电压的大小,使激光与光学参考腔2达到共振,此时声光调制器驱动频率记为f0,并将光电探测器输出的电压信号连接到示波器的一个输入端。Step 3: (Using the standing wave effect of the optical reference cavity, when the difference between the laser frequency and the resonant frequency of the reference cavity is less than half of the line width of the reference cavity, the laser light can accumulate in the optical reference cavity more obviously, and because of the reference cavity cavity The mirror is not a total reflection mirror, and a part of the laser is transmitted from the optical reference cavity. When the transmitted laser light intensity is the largest, that is, when the output voltage amplitude of the photodetector is the largest, the laser and the reference cavity reach resonance;) Select the appropriate acousto-optic modulator, Change the frequency shift frequency of the acousto-optic modulator, and make the laser and the optical reference cavity 2 achieve resonance by judging the output voltage of the photodetector after the optical reference cavity 2. At this time, the driving frequency of the acousto-optic modulator is denoted as f 0 , and the The voltage signal output by the photodetector is connected to one input of the oscilloscope.

步骤四,将声光调制器的驱动信号源输出设置为周期性三角波调制状态,调制后输出的信号频率最小值为fmin、最大值为fmax,该频率范围覆盖f0。同时将三角波信号输出至示波器的另一个输入端口,当信号源从最小频率扫描至最大频率后,在示波器上同时显示一个三角波信号和一个光学参考腔共振峰信号。如图3所示,黑色实线是三角波扫描信号,由于信号源输出的扫描频率是均匀变化,从左到右对应的频率均匀的由fmin变为fmax,黑色点虚线是参考腔颠倒前由光电探测器输出的共振峰信号,根据其与三角波的相对位置可知,该共振信号的最大值对应的频率为f1In step 4, the output of the driving signal source of the acousto-optic modulator is set to a periodic triangular wave modulation state, and the minimum and maximum frequency of the modulated output signal is f min and f max , and the frequency range covers f 0 . At the same time, the triangular wave signal is output to the other input port of the oscilloscope. When the signal source sweeps from the minimum frequency to the maximum frequency, a triangular wave signal and an optical reference cavity formant signal are displayed on the oscilloscope at the same time. As shown in Figure 3, the black solid line is the triangular wave scanning signal. Since the scanning frequency output by the signal source changes uniformly, the corresponding frequency from left to right is uniformly changed from f min to f max , and the black dotted line is the reference cavity before the reversal According to the relative position of the resonance peak signal output by the photodetector and the triangular wave, the frequency corresponding to the maximum value of the resonance signal is f 1 .

步骤五,将待测光学参考腔,即,光学参考腔2上下颠倒,使其产生2g加速度差值,此时由于参考腔所受加速度产生变化,导致参考腔的共振频率发生了变化,颠倒后的共振信号在三角波扫描信号中的相对位置如图3中黑色长虚线所示,该共振信号最大值对应的频率为f2Step 5: Turn the optical reference cavity to be measured, that is, the optical reference cavity 2 upside down, to generate a 2g acceleration difference. At this time, the resonant frequency of the reference cavity changes due to the change in the acceleration received by the reference cavity. The relative position of the resonance signal in the triangular wave scanning signal is shown by the black long dashed line in Fig. 3, and the frequency corresponding to the maximum value of the resonance signal is f 2 .

步骤六,将待测光学参考腔颠倒前后对应的频率做差,除以加速度变化量2g和激光的中心频率f的乘积,可以得到该光学参考腔的振动敏感度,即:(f2-f1)/(2g*f)。Step 6: Make the difference between the corresponding frequencies before and after the inversion of the optical reference cavity to be tested, and divide it by the product of the acceleration change 2g and the center frequency f of the laser to obtain the vibration sensitivity of the optical reference cavity, namely: (f 2 -f 1 )/(2g*f).

下面以实验室已有的可搬运立方体参考腔为例,结合图3,对本发明作进一步的说明。The present invention will be further described below by taking the existing transportable cube reference cavity in the laboratory as an example and in conjunction with FIG. 3 .

步骤一,将型号为DL pro的半导体激光器输出激光经相位调制后耦合入光学参考腔1Step 1: The output laser of the semiconductor laser model DL pro is phase-modulated and coupled into the optical reference cavity 1

步骤二,将该激光器输出激光经偏振分束棱镜分出一束,通过驱动频率为80MHz的声光调制器移频后,将一级衍射光先耦合入一根长5m的单模光纤,再将光纤输出激光耦合入待测光学参考腔2。In step 2, the laser output laser is split into a beam by a polarization beam splitter prism, and after frequency shifting by an acousto-optic modulator with a driving frequency of 80MHz, the first-order diffracted light is first coupled into a single-mode fiber with a length of 5m, and then The fiber output laser is coupled into the optical reference cavity 2 to be measured.

步骤三,将光学参考腔1和光学参考腔2透射信号同时连接到示波器(型号为DPO5104)的两个输入端口,同时大幅扫描激光器中压电陶瓷的驱动电压,在示波器上探测到两个光学参考腔的共振信号,根据耦合入光学参考腔1的激光的调制频率,判断光学参考腔1和光学参考腔2透射信号主峰的频率差,根据该频率差调整声光调制器的驱动频率。此例中假设光学参考腔2的共振频率比光学参考腔1的共振频率大 10MHz。Step 3: Connect the optical reference cavity 1 and optical reference cavity 2 transmission signals to the two input ports of the oscilloscope (model DPO5104) at the same time, and sweep the driving voltage of the piezoelectric ceramics in the laser at the same time, and detect two optical signals on the oscilloscope. For the resonance signal of the reference cavity, according to the modulation frequency of the laser coupled into the optical reference cavity 1, determine the frequency difference of the main peak of the transmission signal of the optical reference cavity 1 and the optical reference cavity 2, and adjust the driving frequency of the acousto-optic modulator according to the frequency difference. In this example, it is assumed that the resonant frequency of optical reference cavity 2 is 10 MHz higher than the resonant frequency of optical reference cavity 1.

步骤四,通过伺服控制系统将半导体激光器输出激光锁定于步骤三中光学参考腔1的共振频率。In step 4, the output laser of the semiconductor laser is locked to the resonance frequency of the optical reference cavity 1 in step 3 through the servo control system.

步骤五,将声光调制器的驱动信号源(型号为SMB100A)的输出信号设置为周期性三角波调制模式,中心频率设置为90MHz,扫描范围从89.9MHz到90.1MHz,即fmin=89.9MHz,fmax=90.1MHz,扫描步进为100Hz/10ms,从小到大一个扫描过程需要时间10s。Step 5: Set the output signal of the driving signal source of the acousto-optic modulator (model SMB100A) to the periodic triangular wave modulation mode, the center frequency is set to 90MHz, and the scanning range is from 89.9MHz to 90.1MHz, that is, f min =89.9MHz, f max =90.1MHz, the scanning step is 100Hz/10ms, and a scanning process from small to large takes 10s.

步骤六,将声光调制器的驱动信号源的三角波调制信号输出至示波器的另一个输入端口,当信号源从最小频率扫描至最大频率后,在示波器上同时显示一个三角波信号和一个光学参考腔共振峰信号。根据光学参考腔2颠倒前共振峰与扫描信号最小值之间的时间差,计算出光学参考腔2颠倒前共振峰对应的频率f1=90.024MHz。Step 6: Output the triangular wave modulation signal of the driving signal source of the acousto-optic modulator to another input port of the oscilloscope. When the signal source sweeps from the minimum frequency to the maximum frequency, a triangular wave signal and an optical reference cavity are displayed on the oscilloscope at the same time. formant signal. According to the time difference between the resonance peak before the optical reference cavity 2 is inverted and the minimum value of the scanning signal, the frequency f 1 =90.024 MHz corresponding to the resonance peak before the optical reference cavity 2 is inverted is calculated.

步骤七,将待测光学参考腔,即,光学参考腔2上下颠倒,使其产生2g加速度差值,此时由于参考腔所受加速度产生变化,导致参考腔的共振频率发生了变化,光学参考腔2颠倒后的共振峰信号f2=90.052MHz。Step 7: Turn the optical reference cavity to be measured, that is, the optical reference cavity 2 upside down, to generate a 2g acceleration difference. At this time, the resonant frequency of the reference cavity changes due to the change in the acceleration received by the reference cavity. The reversal formant signal of cavity 2 is f 2 =90.052 MHz.

步骤八,将待测光学参考腔颠倒前后对应的频率做差,除以加速度变化量2g和激光的中心频率f(该激光的中心频率为4.29×1014Hz)的乘积,可以得到该光学参考腔的振动敏感度,即:(f2-f1)/(2g*f)=3.26×10-11/g。Step 8: Make the difference between the corresponding frequencies before and after the inversion of the optical reference cavity to be tested, and divide it by the product of the acceleration change 2g and the center frequency f of the laser (the center frequency of the laser is 4.29×10 14 Hz), and the optical reference can be obtained. The vibration sensitivity of the cavity, namely: (f 2 −f 1 )/(2g*f)=3.26×10 −11 /g.

Claims (2)

1. A method for testing vibration sensitivity of a portable optical reference cavity is characterized by comprising the following steps:
locking laser output by a light source at the resonance frequency of an optical reference cavity to obtain frequency stabilized laser serving as reference;
step two, coupling the frequency stabilized laser into an optical reference cavity to be measured after frequency shift;
changing the frequency shift frequency by using the acousto-optic modulator, measuring the light intensity of the laser transmitted from the optical reference cavity to be measured, when the transmitted laser light intensity is maximum, enabling the laser and the optical reference cavity to be measured to resonate, and recording the driving frequency of the acousto-optic modulator as f0
Step four, setting the output of the driving signal source of the acousto-optic modulator as a periodic triangular wave, and setting the minimum value of the frequency of the output signal after modulation as fminMaximum value of fmaxThe frequency range covers f0(ii) a When the driving signal source scans from the minimum frequency to the maximum frequency, the frequency corresponding to the maximum value of the transmitted laser light intensity is f1
Step five, the optical reference cavity to be measured is inverted from top to bottom, and when the driving signal source scans from the minimum frequency to the maximum frequency, the frequency corresponding to the maximum value of the transmitted laser light intensity is f2
Step six, making difference on corresponding frequency of the optical reference cavity to be detected before and after inversion, and dividing the difference by the product of the acceleration variation 2g and the central frequency f of the laser to obtain the vibration sensitivity of the optical reference cavity, namely (f)2-f1)/(2g*f)。
2. A portable optical reference chamber vibration sensitivity testing device for implementing the method of claim 1, comprising a laser, a servo control system, an optical reference chamber, an acousto-optic modulator, a drive signal source, a photodetector and an oscillographThe device, its characterized in that: the output laser of the laser is locked at the resonance frequency of the optical reference cavity through a servo control system, the output laser of the laser is coupled into the optical reference cavity to be detected after frequency shift through an acousto-optic modulator, and the laser which is transmitted out of the optical reference cavity to be detected is detected by a photoelectric detector; changing the frequency shift frequency of the acousto-optic modulator, judging that the laser and the optical reference cavity to be measured reach resonance when the output voltage of the photoelectric detector is maximum, and recording the driving frequency of the acousto-optic modulator as f0And connecting the voltage signal output by the photoelectric detector to one input end of the oscilloscope; the output of a drive signal source of the acousto-optic modulator is set as a periodic triangular wave, and the minimum value of the frequency of the output signal after modulation is fminMaximum value of fmaxThe frequency range covers f0(ii) a Outputting the triangular wave signal to the other input port of the oscilloscope; after the signal source scans from the minimum frequency to the maximum frequency, simultaneously displaying a triangular wave signal and an optical reference cavity formant signal to be detected on an oscilloscope; inverting the optical reference cavity to be detected up and down, and displaying the inverted formant signal of the optical reference cavity to be detected on an oscilloscope; and calculating the vibration sensitivity of the optical reference cavity to be measured according to the two formant signals.
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