CN105932527A - Double-frequency comb generation method and apparatus based on parallel frequency shifters and 3-mirror ring cavities having outer-cavity dispersion compensators - Google Patents
Double-frequency comb generation method and apparatus based on parallel frequency shifters and 3-mirror ring cavities having outer-cavity dispersion compensators Download PDFInfo
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Abstract
Description
技术领域technical field
本发明属于超快激光技术，主要涉及一种基于三镜环形腔腔内调制及腔外色散补偿和并联式双声光移频的外差双光学频率梳生成方法与装置。The invention belongs to ultrafast laser technology, and mainly relates to a heterodyne double optical frequency comb generation method and device based on three-mirror annular cavity modulation and extracavity dispersion compensation and parallel double acousto-optic frequency shifting.
背景技术Background technique
由于光学频率梳具有在时域上表现为超短激光脉冲序列、在频域上表现为梳状等间隔多光谱的特性，使其在精密光谱分析、绝对距离测量、激光波长校准、时频信号传递等领域得到了广泛应用。Because the optical frequency comb has the characteristics of ultra-short laser pulse sequence in the time domain and comb-shaped equal interval multi-spectrum in the frequency domain, it can be used in precision spectrum analysis, absolute distance measurement, laser wavelength calibration, time-frequency signal It has been widely used in transmission and other fields.
近年来，在精密光谱分析与绝对距离测量领域中，基于外差双光学频率梳的测量方法不断发展，已经成为其各自领域中的重要研究方向。频域方面，外差双光学频率梳之间各个梳齿的外差干涉信号呈等差数列分布，便于高精度的提取各个梳齿的干涉测量信息。时域方面，外差双光学频率梳之间各个脉冲的时间间隔周期性变化，其测量效果与脉冲扫描状态一致，可大幅节约测量时间。In recent years, in the fields of precision spectral analysis and absolute distance measurement, measurement methods based on heterodyne dual optical frequency combs have been continuously developed, and have become important research directions in their respective fields. In the frequency domain, the heterodyne interference signal of each comb tooth between the heterodyne dual optical frequency combs is distributed in an arithmetic sequence, which is convenient for extracting the interferometric information of each comb tooth with high precision. In the time domain, the time interval of each pulse between the heterodyne dual optical frequency combs changes periodically, and the measurement effect is consistent with the pulse scanning state, which can greatly save measurement time.
现有的外差双光学频率梳生成方法主要基于两套飞秒频率梳系统的互锁定控制。但该方法中两套飞秒频率梳系统的频率一致性受互锁定控制精度限制，同时其实现装置结构复杂、成本高，制约了精密光谱分析和绝对距离测量领域中基于外差双光学频率梳测量方法的进一步发展。另外，光学频率梳的光谱范围对上述领域的测量范围与精度具有决定性作用。因此，亟需一种大光谱范围、高频率一致性、低成本的外差双光学频率梳生成方法与装置。The existing heterodyne dual optical frequency comb generation method is mainly based on the interlocking control of two femtosecond frequency comb systems. However, the frequency consistency of the two femtosecond frequency comb systems in this method is limited by the precision of interlocking control. At the same time, the structure of the device is complex and the cost is high, which restricts the use of heterodyne dual optical frequency combs in the field of precision spectral analysis and absolute distance measurement. Further development of measurement methods. In addition, the spectral range of the optical frequency comb plays a decisive role in the measurement range and precision of the above-mentioned fields. Therefore, there is an urgent need for a large spectral range, high frequency consistency, and low-cost heterodyne dual optical frequency comb generation method and device.
发明内容Contents of the invention
本发明的目的就是针对上述现有技术存在的问题，提出一种并联移频和外色散补偿三镜环形腔双频梳生成方法与装置，达到实现大光谱范围、高频率一致性、低成本的外差双光学频率梳生成的目的。The purpose of the present invention is to solve the problems existing in the above-mentioned prior art, and propose a parallel frequency shifting and external dispersion compensation three-mirror annular cavity dual-frequency comb generation method and device to achieve large spectral range, high frequency consistency, and low cost. The purpose of heterodyne dual optical frequency comb generation.
本发明的目的通过以下技术方案实现：The object of the present invention is achieved through the following technical solutions:
一种并联移频和外色散补偿三镜环形腔双频梳生成方法，该方法步骤如下：A method for generating a dual-frequency comb in a three-mirror annular cavity with parallel frequency shifting and external dispersion compensation, the steps of which are as follows:
(1)一个稳频激光器的出射光频率为v0，所述出射光经过光学隔离器后被分光器分为两束激光，所述两束激光分别通过两个声光调制移频器，所述两个声光调制移频器的调制频率值分别为f1和f2，所述两个声光调制移频器输出的两束+1级移频衍射光频率值分别为v0+f1和v0+f2，所述两束+1级移频衍射光分别输入两个三镜环形腔，两个三镜环形腔内各自含有的一个电光调制器的调制频率分别为f3和f4，所述两个三镜环形腔分别输出一束光学频率梳，两束光学频率梳各自输入一个色散补偿器件，两个色散补偿器件各自输出的一束光学频率梳构成外差双光学频率梳；(1) The output light frequency of a frequency-stabilized laser is v 0 , and the output light is divided into two laser beams by a beam splitter after passing through an optical isolator, and the two laser beams pass through two acousto-optic modulation frequency shifters respectively, so The modulation frequency values of the two acousto-optic modulation frequency shifters are f 1 and f 2 respectively, and the frequency values of the two beams of +1-level frequency-shifted diffracted light output by the two acousto-optic modulation frequency shifters are respectively v 0 +f 1 and v 0 +f 2 , the two beams of +1 order frequency-shifted diffracted light are respectively input into two three-mirror ring cavities, and the modulation frequencies of an electro-optic modulator contained in each of the two three-mirror ring cavities are respectively f 3 and f 4 , the two three-mirror annular cavities respectively output a beam of optical frequency combs, the two beams of optical frequency combs are respectively input into a dispersion compensation device, and the beams of optical frequency combs output by the two dispersion compensation devices respectively form a heterodyne double optical frequency comb;
(2)上述外差双光学频率梳中两束光学频率梳的中心梳齿频率分别为v0+f1和v0+f2，所述两束光学频率梳的中心梳齿频率差值为|f1-f2|，所述两束光学频率梳的中心梳齿频率偏频锁定；(2) The central comb frequencies of the two optical frequency combs in the above-mentioned heterodyne double optical frequency combs are respectively v 0 +f 1 and v 0 +f 2 , and the difference between the central comb frequencies of the two optical frequency combs is |f 1 -f 2 |, the frequency offset locking of the central comb teeth of the two optical frequency combs;
(3)上述外差双光学频率梳中两束光学频率梳的重复频率分别为f3和f4，所述两束光学频率梳的重复频率差值为|f3-f4|，所述两束光学频率梳的重复频率异频锁定；(3) The repetition frequencies of the two optical frequency combs in the above-mentioned heterodyne double optical frequency combs are f 3 and f 4 respectively, and the repetition frequency difference between the two optical frequency combs is |f 3 -f 4 |, and the The repetition frequency interlocking of two optical frequency combs;
(4)上述外差双光学频率梳中两束光学频率梳第i阶梳齿的频率分别表示为v0+f1+i×f3和v0+f2+i×f4，所述两束光学频率梳第i阶梳齿的外差干涉信号频率为|f1-f2|+i×|f3-f4|，所述两束光学频率梳的中心梳齿频率差值|f1-f2|与重复频率差值|f3-f4|满足|f1-f2|>|i|×|f3-f4|,所述两束光学频率梳第i阶梳齿的外差干涉信号频率呈等差数列；(4) The frequencies of the i-th order teeth of the two optical frequency combs in the above-mentioned heterodyne double optical frequency comb are expressed as v 0 +f 1 +i×f 3 and v 0 +f 2 +i×f 4 respectively, the The frequency of the heterodyne interference signal of the i-th order teeth of the two optical frequency combs is |f 1 -f 2 |+i×|f 3 -f 4 |, and the frequency difference between the central teeth of the two optical frequency combs| The difference between f 1 -f 2 | and repetition frequency |f 3 -f 4 | satisfies |f 1 -f 2 |>|i|×|f 3 -f 4 |, the i-th order comb of the two optical frequency combs The frequency of the heterodyne interference signal of the tooth is an arithmetic sequence;
(5)并联配置的初级声光调制移频器和次级声光调制移频器的调制信号由同一台双通道信号发生器提供，上述两个电光调制器的调制信号由另一台双通道信号发生器提供，两台双通道信号发生器的参考频率信号由同一个参考频率振荡器提供。(5) The modulation signals of the primary acousto-optic modulation frequency shifter and the secondary acousto-optic modulation frequency shifter configured in parallel are provided by the same two-channel signal generator, and the modulation signals of the above two electro-optic modulators are provided by another two-channel The signal generator provides the reference frequency signal of the two dual-channel signal generators from the same reference frequency oscillator.
一种并联移频和外色散补偿三镜环形腔双频梳生成装置，在稳频激光器的出射光路上依次配置光学隔离器和分光镜；在所述分光镜的透射光路上配置声光调制移频器A，在所述声光调制移频器A的+1级移频衍射光路上配置三镜环形腔A，所述三镜环形腔A由第一腔镜a、第二腔镜a、第三腔镜a和电光调制器A组成，声光调制移频器A的+1级移频衍射光依次通过第一腔镜a、第二腔镜a，第三腔镜a配置在第二腔镜a的反射光路上，第一腔镜a配置在第三腔镜a的反射光路上，第一腔镜a使来自声光调制移频器A的+1级移频衍射光与来自第三腔镜a的反射光光路重合，所述电光调制器A配置在第一腔镜a、第二腔镜a、第三腔镜a中任意两腔镜之间光路上；在三镜环形腔A外部配置色散补偿器件A，所述色散补偿器件A配置在第二腔镜a的透射光路上；在所述分光镜的反射光路上依次配置反射镜、声光调制移频器B，在所述声光调制移频器B的+1级移频衍射光路上配置三镜环形腔B，所述三镜环形腔B由第一腔镜b、第二腔镜b、第三腔镜b和电光调制器B组成，声光调制移频器B的+1级移频衍射光依次通过第一腔镜b、第二腔镜b，第三腔镜b配置在第二腔镜b的反射光路上，第一腔镜b配置在第三腔镜b的反射光路上，第一腔镜b使来自声光调制移频器B的+1级移频衍射光与来自第三腔镜b的反射光光路重合，所述电光调制器B配置在第一腔镜b、第二腔镜b、第三腔镜b中任意两腔镜之间光路上；在三镜环形腔B外配置色散补偿器件B，所述色散补偿器件B配置在第二腔镜b的透射光路上；参考频率振荡器与双通道信号发生器A、双通道信号发生器B分别连接，所述双通道信号发生器A与声光调制移频器A、声光调制移频器B分别连接，所述双通道信号发生器B与电光调制器A、电光调制器B分别连接。A parallel frequency-shifting and external dispersion compensation three-mirror annular cavity dual-frequency comb generation device, in which an optical isolator and a beam splitter are sequentially arranged on the output optical path of a frequency-stabilized laser; an acousto-optic modulation shifter is arranged on the transmitted optical path of the A frequency converter A, a three-mirror ring cavity A is arranged on the +1-level frequency shift diffraction optical path of the acousto-optic modulation frequency shifter A, and the three-mirror ring cavity A is composed of a first cavity mirror a, a second cavity mirror a, The third cavity mirror a and the electro-optic modulator A are composed. The +1-level frequency-shifted diffracted light of the acousto-optic modulation frequency shifter A passes through the first cavity mirror a and the second cavity mirror a in sequence, and the third cavity mirror a is arranged in the second cavity mirror On the reflected light path of cavity mirror a, the first cavity mirror a is arranged on the reflected light path of the third cavity mirror a, and the first cavity mirror a makes the +1-order frequency-shifted diffracted light from the AOM frequency shifter A and The optical paths of the reflected light of the three-cavity mirror a overlap, and the electro-optic modulator A is configured on the optical path between any two cavity mirrors in the first cavity mirror a, the second cavity mirror a, and the third cavity mirror a; in the three-mirror annular cavity A is equipped with a dispersion compensation device A outside, and the dispersion compensation device A is arranged on the transmission optical path of the second cavity mirror a; a mirror and an acousto-optic modulation frequency shifter B are sequentially arranged on the reflection optical path of the beam splitter, and on the A three-mirror annular cavity B is arranged on the +1-level frequency shifting diffraction optical path of the acousto-optic modulation frequency shifter B, and the three-mirror annular cavity B is composed of a first cavity mirror b, a second cavity mirror b, a third cavity mirror b and Composed of electro-optic modulator B, the +1-level frequency-shifted diffracted light of the acousto-optic modulation frequency shifter B passes through the first cavity mirror b and the second cavity mirror b in sequence, and the third cavity mirror b is arranged on the reflected light of the second cavity mirror b On the road, the first cavity mirror b is arranged on the reflected light path of the third cavity mirror b, and the first cavity mirror b makes the +1-order frequency-shifted diffracted light from the acousto-optic modulation frequency shifter B and the reflected light from the third cavity mirror b The optical paths overlap, the electro-optic modulator B is arranged on the optical path between any two cavity mirrors in the first cavity mirror b, the second cavity mirror b, and the third cavity mirror b; a dispersion compensation device is arranged outside the three-mirror annular cavity B B, the dispersion compensation device B is arranged on the transmission optical path of the second cavity mirror b; the reference frequency oscillator is connected to the dual-channel signal generator A and the dual-channel signal generator B respectively, and the dual-channel signal generator A and the dual-channel signal generator The acousto-optic modulation frequency shifter A and the acousto-optic modulation frequency shifter B are connected respectively, and the dual-channel signal generator B is connected to the electro-optic modulator A and the electro-optic modulator B respectively.
本发明具有以下特点及良好效果：The present invention has following characteristics and good effect:
(1)与现有的外差双光学频率梳生成方法相比，本发明利用一台稳频激光器为外差双光学频率梳的生成过程提供源激光，所生成的外差双光学频率梳频率一致性好。(1) Compared with the existing heterodyne dual optical frequency comb generation method, the present invention utilizes a frequency-stabilized laser to provide source laser light for the generation process of heterodyne dual optical frequency comb, and the generated heterodyne dual optical frequency comb frequency Good consistency.
(2)利用三镜环形腔腔内调制式光学频率梳生成方法与装置简化了外差双光学频率梳生成装置的系统结构，降低了实现成本。(2) The system structure of the heterodyne double optical frequency comb generation device is simplified by using the modulation optical frequency comb generation method and device in the three-mirror annular cavity, and the realization cost is reduced.
(3)并联式双声光移频方法与装置配合同步异频驱动技术实现了外差双光学频率梳中心梳齿频率的偏频锁定。(3) The parallel double acousto-optic frequency shifting method and device cooperate with the synchronous different frequency drive technology to realize the offset frequency locking of the center comb frequency of the heterodyne double optical frequency comb.
(4)双环形腔腔内相位调制方法与装置配合同步异频驱动技术实现了外差双光学频率梳重复频率的异频相互锁定。(4) The intracavity phase modulation method and device of the double ring cavity cooperate with the synchronous different frequency drive technology to realize the different frequency mutual locking of the repetition frequency of the heterodyne double optical frequency comb.
(5)三镜环形腔结构使得谐振腔内的激光单向通过腔内的电光调制器，有效防止电光调制器的灼伤，允许输出大功率的外差双光学频率梳。(5) The three-mirror ring cavity structure allows the laser in the resonator to pass through the electro-optic modulator in the cavity in one direction, effectively preventing the burn of the electro-optic modulator, and allowing the output of high-power heterodyne dual optical frequency combs.
(6)在谐振腔腔外放置色散补偿器件，可大幅减小环形腔尺寸，有利于谐振腔长的减小进而提升外差双光学频率梳的重复频率。(6) Placing a dispersion compensation device outside the resonant cavity can greatly reduce the size of the ring cavity, which is conducive to reducing the length of the resonant cavity and thus increasing the repetition frequency of the heterodyne dual optical frequency comb.
附图说明Description of drawings
图1为并联移频和外色散补偿三镜环形腔双频梳生成装置结构示意图。Fig. 1 is a schematic diagram of the structure of a three-mirror annular cavity dual-frequency comb generating device for parallel frequency shifting and external dispersion compensation.
图中件号说明：1稳频激光器、2光学隔离器、3分光器、4反射镜、5声光移频器A、6声光移频器B、7三镜环形腔A、8第一腔镜a、9第二腔镜a、10第三腔镜a、11三镜环形腔B、12第一腔镜b、13第二腔镜b、14第三腔镜b、15电光调制器A、16电光调制器B、17色散补偿器件A、18色散补偿器件B、19参考频率振荡器、20双通道信号发生器A、21双通道信号发生器B。Part number description in the figure: 1 frequency stabilized laser, 2 optical isolator, 3 beam splitter, 4 reflector, 5 acousto-optic frequency shifter A, 6 acousto-optic frequency shifter B, 7 three-mirror ring cavity A, 8 first Cavity mirror a, 9 Second cavity mirror a, 10 Third cavity mirror a, 11 Three-mirror annular cavity B, 12 First cavity mirror b, 13 Second cavity mirror b, 14 Third cavity mirror b, 15 Electro-optic modulator A, 16 electro-optic modulator B, 17 dispersion compensation device A, 18 dispersion compensation device B, 19 reference frequency oscillator, 20 dual-channel signal generator A, 21 dual-channel signal generator B.
具体实施方式detailed description
下面结合附图对本发明具体实施例作进一步详细描述。The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
一种并联移频和外色散补偿三镜环形腔双频梳生成装置，在稳频激光器1的出射光路上依次配置光学隔离器2和分光镜3；在所述分光镜3的透射光路上配置声光调制移频器A5，在所述声光调制移频器A5的+1级移频衍射光路上配置三镜环形腔A7，所述三镜环形腔A7由第一腔镜a8、第二腔镜a9、第三腔镜a10和电光调制器A15组成，声光调制移频器A5的+1级移频衍射光依次通过第一腔镜a8、第二腔镜a9，第三腔镜a10配置在第二腔镜a9的反射光路上，第一腔镜a8配置在第三腔镜a10的反射光路上，第一腔镜a8使来自声光调制移频器A5的+1级移频衍射光与来自第三腔镜a10的反射光光路重合，所述电光调制器A15配置在第一腔镜a8、第二腔镜a9、第三腔镜a10中任意两腔镜之间光路上；在三镜环形腔A7外部配置色散补偿器件A17，所述色散补偿器件A17配置在第二腔镜a9的透射光路上；在所述分光镜3的反射光路上依次配置反射镜4、声光调制移频器B6，在所述声光调制移频器B6的+1级移频衍射光路上配置三镜环形腔B11，所述三镜环形腔B11由第一腔镜b12、第二腔镜b13、第三腔镜b14和电光调制器B16组成，声光调制移频器B6的+1级移频衍射光依次通过第一腔镜b12、第二腔镜b13，第三腔镜b14配置在第二腔镜b13的反射光路上，第一腔镜b12配置在第三腔镜b14的反射光路上，第一腔镜b12使来自声光调制移频器B6的+1级移频衍射光与来自第三腔镜b14的反射光光路重合，所述电光调制器B16配置在第一腔镜b12、第二腔镜b13、第三腔镜b14中任意两腔镜之间光路上；在三镜环形腔B11外配置色散补偿器件B18，所述色散补偿器件B18配置在第二腔镜b13的透射光路上；参考频率振荡器19与双通道信号发生器A20、双通道信号发生器B21分别连接，所述双通道信号发生器A20与声光调制移频器A5、声光调制移频器B6分别连接，所述双通道信号发生器B21与电光调制器A13、电光调制器B14分别连接。A parallel frequency shifting and external dispersion compensation three-mirror annular cavity dual-frequency comb generating device, in which an optical isolator 2 and a beam splitter 3 are sequentially arranged on the output optical path of a frequency-stabilized laser 1; The acousto-optic modulation frequency shifter A5 is configured with a three-mirror annular cavity A7 on the +1-order frequency shifting diffraction optical path of the acousto-optic modulation frequency shifter A5, and the three-mirror annular cavity A7 is composed of the first cavity mirror a8, the second The cavity mirror a9, the third cavity mirror a10 and the electro-optic modulator A15, the +1-level frequency-shifted diffracted light of the acousto-optic modulation frequency shifter A5 passes through the first cavity mirror a8, the second cavity mirror a9, and the third cavity mirror a10 in sequence It is arranged on the reflected light path of the second cavity mirror a9, and the first cavity mirror a8 is arranged on the reflected light path of the third cavity mirror a10, and the first cavity mirror a8 diffracts the +1 order frequency shift from the acousto-optic modulation frequency shifter A5 The light coincides with the reflected light optical path from the third cavity mirror a10, and the electro-optic modulator A15 is arranged on the optical path between any two cavity mirrors in the first cavity mirror a8, the second cavity mirror a9, and the third cavity mirror a10; The dispersion compensation device A17 is arranged outside the three-mirror annular cavity A7, and the dispersion compensation device A17 is arranged on the transmission light path of the second cavity mirror a9; the reflector 4, the acousto-optic modulation shifter are sequentially arranged on the reflection light path of the beam splitter 3 A frequency converter B6, a three-mirror ring cavity B11 is arranged on the +1-order frequency shift diffraction optical path of the acousto-optic modulation frequency shifter B6, and the three-mirror ring cavity B11 is composed of a first cavity mirror b12, a second cavity mirror b13, The third cavity mirror b14 and the electro-optic modulator B16 are composed. The +1-level frequency-shifted diffracted light of the acousto-optic modulation frequency shifter B6 passes through the first cavity mirror b12 and the second cavity mirror b13 in sequence, and the third cavity mirror b14 is arranged on the second cavity mirror b14. On the reflected light path of the cavity mirror b13, the first cavity mirror b12 is arranged on the reflected light path of the third cavity mirror b14, and the first cavity mirror b12 combines the +1-order frequency-shifted diffracted light from the acousto-optic modulation frequency shifter B6 with the The optical paths of the reflected light of the three-cavity mirror b14 overlap, and the electro-optic modulator B16 is arranged on the optical path between any two cavity mirrors in the first cavity mirror b12, the second cavity mirror b13, and the third cavity mirror b14; in the three-mirror annular cavity Dispersion compensation device B18 is configured outside B11, and the dispersion compensation device B18 is configured on the transmission optical path of the second cavity mirror b13; the reference frequency oscillator 19 is connected with the dual-channel signal generator A20 and the dual-channel signal generator B21 respectively, and the The two-channel signal generator A20 is connected to the AOM frequency shifter A5 and the AOM frequency shifter B6 respectively, and the two-channel signal generator B21 is connected to the electro-optic modulator A13 and the electro-optic modulator B14 respectively.
所述的三镜环形腔A7的第一腔镜a8、第二腔镜a9、第三腔镜a10和三镜环形腔B11的第一腔镜b12、第二腔镜b13、第三腔镜b14包括平面镜、凹面镜和凸面镜腔镜类型。The first cavity mirror a8, the second cavity mirror a9, the third cavity mirror a10 of the three-mirror annular cavity A7 and the first cavity mirror b12, the second cavity mirror b13, and the third cavity mirror b14 of the three-mirror annular cavity B11 Includes planar, concave, and convex cavity mirror types.
所述的色散补偿器件A17和色散补偿器件B18包括光栅对、棱镜对和色散补偿光纤。The dispersion compensation device A17 and dispersion compensation device B18 include a pair of gratings, a pair of prisms and a dispersion compensation fiber.
所述的电光调制器A15和电光调制器B16包括电光强度调制器和电光相位调制器。The electro-optic modulator A15 and the electro-optic modulator B16 include an electro-optic intensity modulator and an electro-optic phase modulator.
所述的参考频率振荡器19包括原子钟、晶体振荡器、陶瓷振荡器、电子振荡器。The reference frequency oscillator 19 includes atomic clocks, crystal oscillators, ceramic oscillators, and electronic oscillators.
一种并联移频和外色散补偿三镜环形腔双频梳生成方法，该方法步骤如下：A method for generating a dual-frequency comb in a three-mirror annular cavity with parallel frequency shifting and external dispersion compensation, the steps of which are as follows:
(1)一个稳频激光器的出射光频率为v0，所述出射光经过光学隔离器后被分光器分为两束激光，所述两束激光分别通过两个声光调制移频器，所述两个声光调制移频器的调制频率值分别为f1和f2，所述两个声光调制移频器输出的两束+1级移频衍射光频率值分别为v0+f1和v0+f2，所述两束+1级移频衍射光分别输入两个三镜环形腔，两个三镜环形腔内各自含有的一个电光调制器的调制频率分别为f3和f4，所述两个三镜环形腔分别输出一束光学频率梳，两束光学频率梳各自输入一个色散补偿器件，两个色散补偿器件各自输出的一束光学频率梳构成外差双光学频率梳；(1) The output light frequency of a frequency-stabilized laser is v 0 , and the output light is divided into two laser beams by a beam splitter after passing through an optical isolator, and the two laser beams pass through two acousto-optic modulation frequency shifters respectively, so The modulation frequency values of the two acousto-optic modulation frequency shifters are f 1 and f 2 respectively, and the frequency values of the two beams of +1-level frequency-shifted diffracted light output by the two acousto-optic modulation frequency shifters are respectively v 0 +f 1 and v 0 +f 2 , the two beams of +1 order frequency-shifted diffracted light are respectively input into two three-mirror ring cavities, and the modulation frequencies of an electro-optic modulator contained in each of the two three-mirror ring cavities are respectively f 3 and f 4 , the two three-mirror annular cavities respectively output a beam of optical frequency combs, the two beams of optical frequency combs are respectively input into a dispersion compensation device, and the beams of optical frequency combs output by the two dispersion compensation devices respectively form a heterodyne double optical frequency comb;
(2)上述外差双光学频率梳中两束光学频率梳的中心梳齿频率分别为v0+f1和v0+f2，所述两束光学频率梳的中心梳齿频率差值为|f1-f2|，所述两束光学频率梳的中心梳齿频率偏频锁定；(2) The central comb frequencies of the two optical frequency combs in the above-mentioned heterodyne double optical frequency combs are respectively v 0 +f 1 and v 0 +f 2 , and the difference between the central comb frequencies of the two optical frequency combs is |f 1 -f 2 |, the frequency offset locking of the central comb teeth of the two optical frequency combs;
(3)上述外差双光学频率梳中两束光学频率梳的重复频率分别为f3和f4，所述两束光学频率梳的重复频率差值为|f3-f4|，所述两束光学频率梳的重复频率异频锁定；(3) The repetition frequencies of the two optical frequency combs in the above-mentioned heterodyne double optical frequency combs are f 3 and f 4 respectively, and the repetition frequency difference between the two optical frequency combs is |f 3 -f 4 |, and the The repetition frequency interlocking of two optical frequency combs;
(4)上述外差双光学频率梳中两束光学频率梳第i阶梳齿的频率分别表示为v0+f1+i×f3和v0+f2+i×f4，所述两束光学频率梳第i阶梳齿的外差干涉信号频率为|f1-f2|+i×|f3-f4|，所述两束光学频率梳的中心梳齿频率差值|f1-f2|与重复频率差值|f3-f4|满足|f1-f2|>|i|×|f3-f4|,所述两束光学频率梳第i阶梳齿的外差干涉信号频率呈等差数列；(4) The frequencies of the i-th order teeth of the two optical frequency combs in the above-mentioned heterodyne double optical frequency comb are expressed as v 0 +f 1 +i×f 3 and v 0 +f 2 +i×f 4 respectively, the The frequency of the heterodyne interference signal of the i-th order teeth of the two optical frequency combs is |f 1 -f 2 |+i×|f 3 -f 4 |, and the frequency difference between the central teeth of the two optical frequency combs| The difference between f 1 -f 2 | and repetition frequency |f 3 -f 4 | satisfies |f 1 -f 2 |>|i|×|f 3 -f 4 |, the i-th order comb of the two optical frequency combs The frequency of the heterodyne interference signal of the tooth is an arithmetic sequence;
(5)并联配置的初级声光调制移频器和次级声光调制移频器的调制信号由同一台双通道信号发生器提供，上述两个电光调制器的调制信号由另一台双通道信号发生器提供，两台双通道信号发生器的参考频率信号由同一个参考频率振荡器提供。(5) The modulation signals of the primary acousto-optic modulation frequency shifter and the secondary acousto-optic modulation frequency shifter configured in parallel are provided by the same two-channel signal generator, and the modulation signals of the above two electro-optic modulators are provided by another two-channel The signal generator provides the reference frequency signal of the two dual-channel signal generators from the same reference frequency oscillator.
所述初级声光调制移频器和次级声光调制移频器的其他级次移频衍射光同样可以实现上述步骤。The above-mentioned steps can also be realized by the frequency-shifted diffracted light of other orders of the primary AOM frequency shifter and the secondary AOM frequency shifter.
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