CN106679943A - Method for measuring escape efficiency of optical parametric oscillation chamber - Google Patents
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Abstract
本发明涉及量子信息技术领域，特别涉及光学参量振荡腔的逃逸效率确定方法。其技术方案是：一种测量光学参量振荡腔逃逸效率的方法，其特征是执行以下步骤：A.在恒定的入射光功率下，测量待测光学参量振荡腔共振时的反射光功率Pr,on；B.保持入射光功率不变，测量待测光学参量振荡腔远离共振时的反射光功率Pr,off；C.计算待测光学参量振荡腔共振时和远离共振时的反射光功率之比D.计算待测光学参量振荡腔的逃逸效率ηesc，该方法操作简单、结果精确直观，具有较高的实用价值。
The invention relates to the technical field of quantum information, in particular to a method for determining the escape efficiency of an optical parametric oscillation cavity. Its technical scheme is: a method for measuring the escape efficiency of an optical parametric oscillation cavity, which is characterized in that the following steps are performed: A. under constant incident light power, measure the reflected light power P r when the optical parameter oscillation cavity to be measured resonates, on ; B. Keeping the incident light power constant, measure the reflected light power P r,off when the optical parameter oscillation cavity to be measured is away from resonance; C. Calculate the difference between the reflected light power when the optical parameter oscillation cavity to be measured is in resonance and away from resonance Than D. Calculate the escape efficiency η esc of the optical parametric oscillation cavity to be measured. This method is simple to operate, accurate and intuitive, and has high practical value.
Description
技术领域technical field
本发明涉及量子信息技术领域，特别涉及光学参量振荡腔的逃逸效率确定方法。The invention relates to the technical field of quantum information, in particular to a method for determining the escape efficiency of an optical parametric oscillation cavity.
背景技术Background technique
压缩态光场是一种非常重要的非经典光场，可以应用于引力波的探测、光学精密测量、纠缠态光场的产生、量子通讯等研究领域。尤其在量子通讯方面，两个单模压缩态光场或者一个双模压缩态光场可用来产生纠缠光，纠缠光是量子信息技术的核心资源，可以完成量子纠缠交换、超微弱信息的量子传输、量子保密通信、量子密集编码和量子离物传态等量子通信领域的重要原理性实验。压缩态光场噪声压缩度的大小主要由压缩光产生系统的总损耗和总相位噪声决定，系统的总损耗主要由制备压缩光所用光学参量振荡腔的逃逸效率、压缩光的传输损耗、平衡零拍探测系统的干涉效率、平衡零拍探测器的量子效率等组成。量化系统的损耗对压缩/纠缠光源总体设计，及分析理论结果和实验结果的差异和克服等具有重要意义。Squeezed light field is a very important non-classical light field, which can be applied in the detection of gravitational waves, optical precision measurement, generation of entangled light field, quantum communication and other research fields. Especially in quantum communication, two single-mode squeezed light fields or a double-mode squeezed light field can be used to generate entangled light. Entangled light is the core resource of quantum information technology, which can complete quantum entanglement exchange and quantum transmission of ultra-weak information. Important principle experiments in the field of quantum communication, such as quantum secure communication, quantum dense coding and quantum state transfer. The compression degree of the squeezed light field noise is mainly determined by the total loss and the total phase noise of the squeezed light generation system. It is composed of the interference efficiency of the beat detection system and the quantum efficiency of the balanced zero-beat detector. Quantifying the loss of the system is of great significance to the overall design of the compressed/entangled light source, as well as analyzing the differences and overcoming the differences between theoretical results and experimental results.
传输损耗由压缩光产生系统到探测系统之间的所有光学元件的损耗之和，在实验中容易测量获得。平衡零拍探测系统的干涉效率由本地振荡光和信号光的干涉效率决定，在实验中容易测量获得。平衡零拍探测器的量子效率由探测器所用光电二极管的性能决定，光电二极管出厂时一般都有标称。而光学参量振荡腔的逃逸效率由光学参量振荡腔中光学元件的反射率，腔内非线性晶体的吸收损耗等因素共同决定。The transmission loss is the sum of the losses of all optical elements between the compressed light generation system and the detection system, which can be easily measured in experiments. The interference efficiency of a balanced zero-beat detection system is determined by the interference efficiency of local oscillator light and signal light, which can be easily measured in experiments. The quantum efficiency of a balanced zero-beat detector is determined by the performance of the photodiode used in the detector, and the photodiode generally has a nominal value when it leaves the factory. The escape efficiency of the optical parametric oscillation cavity is determined by the reflectivity of the optical elements in the optical parametric oscillation cavity, the absorption loss of the nonlinear crystal in the cavity and other factors.
光学参量振荡过程是获得压缩态光场的重要技术手段，根据光学参量振荡腔量子噪声的理论分析，可以得到正交分量压缩的理论表达式(P.K.Lam,T.C.Ralph,B.C.Buchlerer al.,Optimization and transfer of vacuum squeezing from an opticalparametric oscillator,J.Opt.B:Quantum Semiclass.Opt.1(1999)469-474)如下：The optical parametric oscillation process is an important technical means to obtain the squeezed light field. According to the theoretical analysis of the quantum noise of the optical parametric oscillation cavity, the theoretical expression of the orthogonal component compression can be obtained (P.K.Lam, T.C.Ralph, B.C.Buchlerer al., Optimization and transfer of vacuum squeezing from an opticalparametric oscillator, J.Opt.B: Quantum Semiclass.Opt.1(1999)469-474) as follows:
其中，ηesc是光学参量振荡腔的逃逸效率，同等条件下，逃逸效率越高，获得的压缩度越高。逃逸效率为光学参量振荡腔输出耦合透射率与总损耗的比值，对于固定的输出耦合透射率，光学参量腔的内腔损耗越小，逃逸效率越高。内腔损耗与腔内元件的质量有关，在现有技术中，要计算内腔损耗，需要对腔的输入耦合镜反射率、输出耦合镜的反射率、腔内元件的剩余反射率、腔内元件的吸收损耗等均进行测量才能获得。不仅操作过程繁琐，而且对内腔损耗的衡量不直观。Among them, η esc is the escape efficiency of the optical parametric oscillation cavity. Under the same conditions, the higher the escape efficiency, the higher the degree of compression obtained. The escape efficiency is the ratio of the output coupling transmittance of the optical parametric cavity to the total loss. For a fixed output coupling transmittance, the smaller the inner cavity loss of the optical parametric cavity, the higher the escape efficiency. The cavity loss is related to the quality of the components in the cavity. In the prior art, to calculate the cavity loss, it is necessary to calculate the reflectivity of the input coupling mirror of the cavity, the reflectivity of the output coupling mirror, the residual reflectivity of the components in the cavity, and the The absorption loss of the component can only be obtained by measuring. Not only the operation process is cumbersome, but also the measurement of the cavity loss is not intuitive.
逃逸效率为光学参量振荡腔输出耦合透射率与总损耗的比值，对于固定的输出耦合透射率，光学参量腔的内腔损耗越小，逃逸效率越高，在同等条件下，逃逸效率越高，获得的压缩度越高。而光学参量振荡腔的逃逸效率由光学参量振荡腔中光学元件的反射率，腔内非线性晶体的剩余反射率、吸收损耗等因素共同决定。所以在现有技术中，要得到逃逸效率，就需要测出输入耦合镜、输出耦合镜、以及其它腔镜的反射率、透射率及其他各腔镜的损耗、腔内晶体的剩余反射率，腔内晶体的损耗，求出损耗的粗略值，进而利用逃逸效率公式求出逃逸效率，其中Tout为耦合镜的透射功率，Lcav为除输出耦合镜透过率外其它损耗之和，ηesc为逃逸效率。The escape efficiency is the ratio of the output coupling transmittance of the optical parametric oscillator cavity to the total loss. For a fixed output coupling transmittance, the smaller the inner cavity loss of the optical parametric cavity, the higher the escape efficiency. Under the same conditions, the higher the escape efficiency, The higher the degree of compression obtained. The escape efficiency of the optical parametric oscillation cavity is determined by the reflectivity of the optical elements in the optical parametric oscillation cavity, the residual reflectivity of the nonlinear crystal in the cavity, and the absorption loss. Therefore, in the prior art, in order to obtain the escape efficiency, it is necessary to measure the reflectivity and transmittance of the input coupling mirror, the output coupling mirror, and other cavity mirrors, the loss of other cavity mirrors, and the residual reflectivity of the crystal in the cavity. The loss of the crystal in the cavity, calculate the rough value of the loss, and then use the escape efficiency formula Find the escape efficiency, where T out is the transmitted power of the coupling mirror, L cav is the sum of other losses except the transmittance of the output coupling mirror, and η esc is the escape efficiency.
为了确定逃逸效率需要对输入耦合镜透射率、其它腔镜的发射率、腔内元件的剩余反射率、腔内元件的吸收损耗等参数进行逐一测量，测量参数较多，过程繁琐，且每个元件参数测量的误差累积会影响最终的测量结果。In order to determine the escape efficiency, it is necessary to measure parameters such as the transmittance of the input coupling mirror, the emissivity of other cavity mirrors, the residual reflectivity of the cavity components, and the absorption loss of the cavity components. There are many measurement parameters, and the process is cumbersome, and each The error accumulation of component parameter measurement will affect the final measurement result.
发明内容Contents of the invention
为了解决上述现有技术中所存在的问题，本发明的目的在于提供一种测量光学参量振荡腔逃逸效率的方法，无需测量每一个腔内元件的反射和损耗参数，使测量的过程简单，结果精确。In order to solve the problems in the above-mentioned prior art, the object of the present invention is to provide a method for measuring the escape efficiency of an optical parametric oscillation cavity, without measuring the reflection and loss parameters of each component in the cavity, so that the measurement process is simple and the result is accurate.
为了实现上述目的，本发明采用如下技术方案：一种测量光学参量振荡腔逃逸效率的方法，其特征是执行以下步骤：In order to achieve the above object, the present invention adopts the following technical scheme: a method for measuring the escape efficiency of an optical parametric oscillation cavity, which is characterized in that the following steps are performed:
一种测量光学参量振荡腔逃逸效率的方法，其特征是执行以下步骤：A method for measuring the escape efficiency of an optical parametric oscillation cavity is characterized in that the following steps are performed:
A.在恒定的入射光功率下，测量待测光学参量振荡腔共振时的反射光功率Pr,on；A. Under constant incident light power, measure the reflected light power P r,on when the optical parametric oscillation cavity to be measured resonates;
B.保持入射光功率不变，测量待测光学参量振荡腔远离共振时的反射光功率Pr,off；B. Keeping the incident light power constant, measure the reflected light power P r,off when the optical parameter oscillation cavity to be measured is away from the resonance;
C.计算待测光学参量振荡腔共振时和远离共振时的反射光功率之比 C. Calculate the ratio of the reflected light power when the optical parameter oscillation cavity to be measured is in resonance and away from the resonance
D.计算待测光学参量振荡腔的逃逸效率ηesc， D. Calculate the escape efficiency η esc of the optical parametric oscillation cavity to be measured,
进一步的，所述反射光的功率测量方法是采用激光功率计测量反射光功率的绝对值。Further, the power measurement method of the reflected light is to use a laser power meter to measure the absolute value of the reflected light power.
进一步的，所述反射光的功率测量方法是采用线性光电转换器件测量反射光功率的相对值。Further, the method for measuring the power of reflected light is to use a linear photoelectric conversion device to measure the relative value of reflected light power.
进一步的，所述光学参量振荡腔输出镜的透过率远大于腔内其它元件的损耗之和。Further, the transmittance of the output mirror of the optical parametric oscillation cavity is much greater than the sum of losses of other components in the cavity.
本发明提供一种测量光学参量振荡腔逃逸效率的方法，只需测量待测光学参量振荡腔共振与非共振时反射光的功率，就可以迅速计算获得光学参量振荡腔的逃逸效率，操作简单、结果精确直观，具有较高的实用价值。The invention provides a method for measuring the escape efficiency of an optical parametric oscillation cavity. It only needs to measure the power of the reflected light when the optical parametric oscillation cavity is resonant and non-resonant, and the escape efficiency of the optical parametric oscillation cavity can be quickly calculated. The operation is simple and convenient. The result is accurate and intuitive, and has high practical value.
附图说明Description of drawings
图1为两镜光学参量振荡腔装置结构示意图；Fig. 1 is a schematic diagram of the structure of a two-mirror optical parametric oscillation cavity device;
图2为四镜环形光学参量振荡腔装置结构示意图；Fig. 2 is a structural schematic diagram of a four-mirror annular optical parametric oscillation cavity device;
图3为本发明与现有技术测量结果对比图。Fig. 3 is a comparison chart of measurement results between the present invention and the prior art.
具体实施方式detailed description
结合附图对本发明的技术方案作说明如下。The technical solution of the present invention is described as follows in conjunction with the accompanying drawings.
以下通过具体实例对本发明的技术方案作进一步的详细说明。The technical solutions of the present invention will be further described in detail below through specific examples.
实例1：Example 1:
如图1所示，选择最简单的两镜光学参量振荡腔作为本发明光学参量振荡腔逃逸效率的测量对象，测量过程中，光束从光学参量腔的输出镜入射，则光学参量腔的输出镜作为实际测量过程中的输入镜。As shown in Figure 1, the simplest two-mirror optical parametric oscillation cavity is selected as the measurement object of the escape efficiency of the optical parametric oscillation cavity of the present invention. In the measurement process, the light beam is incident from the output mirror of the optical parametric cavity, and the output mirror As an input mirror in the actual measurement process.
设输入耦合镜的反射率为r1，透射率为t1，输出耦合镜的反射率为r2，透射率为t2，光学参量腔内有一非线性倍频晶体，设晶体的吸收为tc，Ein为输入耦合镜前面的电场强度，Eout为输出耦合镜前面的电场强度，Er为反射后输入耦合镜前面的电场强度。对于理想的两镜光学参量振荡腔，可以认为腔内场在任何一点都具有相同的相位，很容易得到标准化输入场。Assuming that the reflectance of the input coupling mirror is r 1 and the transmittance is t 1 , the reflectance of the output coupling mirror is r 2 and the transmittance is t 2 , there is a nonlinear frequency doubling crystal in the optical parameter cavity, and the absorption of the crystal is t c , E in is the electric field strength in front of the input coupling mirror, E out is the electric field strength in front of the output coupling mirror, and E r is the electric field strength in front of the input coupling mirror after reflection. For an ideal two-mirror optical parametric oscillator cavity, it can be considered that the field in the cavity has the same phase at any point, and it is easy to obtain a normalized input field.
两镜光学参量振荡腔输入光波的电场强度可以表达为Ein(t)＝E0eiωt,则透射光波的振幅可以表达为：The electric field intensity of the input light wave of the two-mirror optical parametric oscillator cavity can be expressed as E in (t)=E 0 e iωt , then the amplitude of the transmitted light wave can be expressed as:
式中Ein(t)为输入光场的振幅，E0为初始的电场振幅，Et(t)为透射光场的振幅，ω为光场的角频率，t为光场的传播时间，L为光学参量振荡腔的腔长，c为光在真空中的传播速度。透射光场的振幅Et(t)的表达式为无穷阶等比数列，当等比数列的阶数趋于无穷大时，透射光场的振幅Et(t)可以用上面公式第二个等号后的式子来表示。where E in (t) is the amplitude of the input light field, E 0 is the initial electric field amplitude, E t (t) is the amplitude of the transmitted light field, ω is the angular frequency of the light field, t is the propagation time of the light field, L is the cavity length of the optical parametric oscillation cavity, and c is the propagation speed of light in vacuum. The expression of the amplitude E t (t) of the transmitted light field is an infinite-order geometric sequence. When the order of the geometric sequence tends to infinity, the amplitude E t (t) of the transmitted light field can be expressed by the second equation of the above formula expressed by the formula after the number.
反射光波的电场强度表达为：The electric field strength of the reflected light wave is expressed as:
式中Er(t)为反射光场的振幅；where E r (t) is the amplitude of the reflected light field;
则有：Then there are:
由腔共振时的条件易得腔共振时反射光的振幅Er,on与入射光的振幅Ein之比为：Conditions when the cavity is resonated by The ratio of the amplitude E r,on of the reflected light to the amplitude E in of the incident light when the cavity resonance is easy to obtain is:
其中，rL＝r2tL 2是输出镜的透射和晶体的吸收两者引入的等效振幅反射率。where r L =r 2 t L 2 is the equivalent amplitude reflectance introduced by both the transmission of the output mirror and the absorption of the crystal.
由腔远离共振时的条件易得腔远离共振时反射光的振幅Er,off与入射光的振幅Ein之比为：Conditions when the cavity is far from the resonance The ratio of the amplitude E r,off of the reflected light to the amplitude E in of the incident light when the cavity is far away from the resonance is:
其中，rL＝r2tL 2是输出镜的透射和晶体的吸收两者引入的等效振幅反射率。where r L =r 2 t L 2 is the equivalent amplitude reflectance introduced by both the transmission of the output mirror and the absorption of the crystal.
所以对这两式进行平方，就可以求得共振时反射光的功率Pr,on与入射光的功率Pin之比为：Therefore, by squaring the two equations, the ratio of the power P r,on of the reflected light to the power P in of the incident light at resonance can be obtained as:
远离共振时反射光的功率Pr,off与入射光的功率Pin之比为：The ratio of the power P r,off of the reflected light to the power P in of the incident light when it is far away from the resonance is:
则腔共振与远离共振时反射光的功率之比ε为：Then the ratio ε of the power of the reflected light at the cavity resonance and away from the resonance is:
实例2：Example 2:
如图2所示，选用单共振的四镜环型腔作为光学参量振荡腔，由两个平面镜(M1、M2)和两个平凹镜(M3、M4)组成，晶体位于两凹面镜的中央。As shown in Figure 2, a single-resonant four-mirror ring cavity is selected as the optical parametric oscillation cavity, which is composed of two plane mirrors (M 1 , M 2 ) and two plano-concave mirrors (M 3 , M 4 ). The center of the concave mirror.
令：输入镜的的振幅反射率分别为r1，振幅透射率为t1，其它腔镜的振幅反射率分别为r2、r3、r4，振幅透射率分别为t2、t3、t4，光学参量腔内有一非线性晶体，设晶体的吸收为tc，同样设腔输入光波的电场强度可以表达为Ein(t)＝E0eiωt,Order: the amplitude reflectance of the input mirror is r 1 , the amplitude transmittance is t 1 , the amplitude reflectance of other cavity mirrors are r 2 , r 3 , r 4 respectively, and the amplitude transmittance are t 2 , t 3 , t 4 , there is a nonlinear crystal in the optical parameter cavity, let the absorption of the crystal be t c , and also set the electric field intensity of the input light wave into the cavity can be expressed as E in (t)=E 0 e iωt ,
同实施例1，可得反射光波的电场强度表达为：With embodiment 1, the electric field strength of available reflected light wave is expressed as:
式中Ein(t)为输入光场的振幅，E0为初始的电场振幅，Et(t)为透射光场的振幅，ω为光场的角频率，t为光场的传播时间，L为光学参量振荡腔的腔长，c为光在真空中的传播速度。透射光场的振幅Et(t)的表达式为无穷阶等比数列，当等比数列的阶数趋于无穷大时，透射光场的振幅Et(t)可以用上面表达式右边的式子来表示；where E in (t) is the amplitude of the input light field, E 0 is the initial electric field amplitude, E t (t) is the amplitude of the transmitted light field, ω is the angular frequency of the light field, t is the propagation time of the light field, L is the cavity length of the optical parametric oscillation cavity, and c is the propagation speed of light in vacuum. The expression of the amplitude E t (t) of the transmitted light field is an infinite order geometric sequence. When the order of the geometric sequence tends to infinity, the amplitude E t (t) of the transmitted light field can be expressed by the formula on the right side of the above expression sub to represent;
则有：Then there are:
由腔共振时的条件易得腔共振时反射光的振幅Er,on与入射光的振幅Ein之比为：Conditions when the cavity is resonated by The ratio of the amplitude E r,on of the reflected light to the amplitude E in of the incident light when the cavity resonance is easy to obtain is:
其中，rL＝tcr2r3r4是除输入耦合镜外其它腔镜总的等效振幅反射率。Among them, r L =t c r 2 r 3 r 4 is the total equivalent amplitude reflectivity of other cavity mirrors except the input coupling mirror.
由腔远离共振时的条件易得腔远离共振时反射光的振幅Er,off与入射光的振幅Ein之比为：Conditions when the cavity is far from the resonance The ratio of the amplitude E r,off of the reflected light to the amplitude E in of the incident light when the cavity is far away from the resonance is:
对上述两式进行平方，求得共振时反射光的功率Pr,on与入射光的功率Pin之比为：Square the above two equations to obtain the ratio of the power P r,on of the reflected light to the power P in of the incident light at resonance:
远离共振时反射光的功率与入射光的功率Pin之比为：The ratio of the reflected light power to the incident light power P in when away from resonance is:
则腔共振与远离共振时反射光的功率之比ε为Then the ratio ε of the power of the reflected light at the cavity resonance and away from the resonance is
可见，腔共振与远离共振时反射光的功率之比ε，对于实施例1的两镜光学参量振荡腔，实施例2的四镜环型光学参量振荡腔，存在相同的函数关系。根据上面的推导过程，显而易见可将该关系推广到任意数量腔镜的光学参量振荡腔，且均满足上述的表达式。It can be seen that the ratio ε of the reflected light power between the cavity resonance and the resonance away from the resonance has the same functional relationship for the two-mirror optical parametric oscillation cavity of embodiment 1 and the four-mirror ring optical parametric oscillation cavity of embodiment 2. According to the above derivation process, it is obvious that this relationship can be extended to the optical parametric oscillation cavity with any number of cavity mirrors, and all of them satisfy the above expressions.
由逃逸效率公式其中显而易见，逃逸效率与腔共振与非共振时的功率之比ε之间有函数关系。From the escape efficiency formula in Evidently, the escape efficiency is a function of the ratio ε of the cavity resonant and off-resonant powers.
逃逸效率为光学参量振荡腔输出耦合透射率与总损耗的比值，对于固定的输出耦合透射率，光学参量腔的内腔损耗越小，逃逸效率越高，在同等条件下，逃逸效率越高，获得的压缩度越高。故要获得高的压缩度，就需要高的逃逸效率，则Lcav,rL＜＜1。因此，我们能够得到上述条件下逃逸效率腔共振与远离共振时的反射功率之比ε之间的关系，即可利用腔共振与非共振时的反射功率之比的测量结果，计算得到光学参量振荡腔的逃逸效率。The escape efficiency is the ratio of the output coupling transmittance of the optical parametric oscillator cavity to the total loss. For a fixed output coupling transmittance, the smaller the inner cavity loss of the optical parametric cavity, the higher the escape efficiency. Under the same conditions, the higher the escape efficiency, The higher the degree of compression obtained. Therefore, in order to obtain a high degree of compression, a high escape efficiency is required, then L cav ,r L <<1. Therefore, we can obtain the relationship between the ratio ε of the escape efficiency cavity resonance and the reflected power away from the resonance under the above conditions, that is, the optical parameter oscillation can be calculated by using the measurement results of the ratio of the reflected power between the cavity resonance and the off-resonance cavity escape efficiency.
根据上述的上面的关系，以及光学参量振荡腔的实际工作条件，光学参量振荡腔的腔内损耗Lcav能近似表达为下面的式子According to the above relationship and the actual working conditions of the optical parametric oscillation cavity, the intracavity loss L cav of the optical parametric oscillation cavity can be approximately expressed as the following formula
将上式带入逃逸效率公式得到逃逸效率ηesc可表示为：Bring the above formula into the escape efficiency formula Obtaining the escape efficiency η esc can be expressed as:
因此，光学参量振荡腔的逃逸效率，只需测量待测光学参量振荡腔共振与非共振时反射光的功率，就可以迅速计算得到。具体测量方法是执行以下步骤：Therefore, the escape efficiency of the optical parametric oscillation cavity can be quickly calculated only by measuring the power of the reflected light when the optical parametric oscillation cavity is resonant and non-resonant. The specific measurement method is to perform the following steps:
A.在恒定的入射光功率下，测量待测光学参量振荡腔共振时的反射光的功率Pr,on；A. Under a constant incident light power, measure the power P r,on of the reflected light when the optical parametric oscillation cavity to be measured resonates;
B.保持入射光功率不变，测量待测光学参量振荡腔远离共振时的反射光的功率Pr,off；B. Keeping the incident light power constant, measure the power P r,off of the reflected light when the optical parameter oscillation cavity to be measured is away from the resonance;
C.计算待测光学参量振荡腔共振时和远离共振时的反射光的功率之比 C. Calculate the power ratio of the reflected light when the optical parameter oscillation cavity to be measured is in resonance and away from the resonance
D.计算待测光学参量振荡腔的逃逸效率ηesc， D. Calculate the escape efficiency η esc of the optical parametric oscillation cavity to be measured,
进一步的，所述反射光的功率测量方法是采用激光功率计测量反射光功率的绝对值。Further, the power measurement method of the reflected light is to use a laser power meter to measure the absolute value of the reflected light power.
进一步的，所述反射光的功率测量方法是采用线性光电转换器件测量反射光功率的相对值。Further, the method for measuring the power of reflected light is to use a linear photoelectric conversion device to measure the relative value of reflected light power.
进一步的，所述光学参量振荡腔输出镜的透过率远大于腔内其它元件的损耗之和。Further, the transmittance of the output mirror of the optical parametric oscillation cavity is much greater than the sum of losses of other components in the cavity.
对比实验：利用背景技术介绍的现有技术和本发明技术分别测量了该实施例所述的光学参量振荡强的逃逸效率，图3是测量结果(横坐标为测量过程中输入耦合镜的透过率，纵坐标为光学参量振荡腔的逃逸效率)。图中方形的数据点为利用现有技术测量得到的逃逸效率结果，圆形的数据点为利用本发明技术测量得到的逃逸效率结果。两种方法对比表明本发明技术的测量结果不确定度为约为0.3％，且测量结果的不确定度随着光学参量振荡腔逃逸效率的增大而减小。Contrast experiment: Utilize the prior art of background technology introduction and the technology of the present invention to measure respectively the strong escape efficiency of the optical parameter oscillation described in this embodiment, Fig. 3 is measurement result (the abscissa is the transmission of input coupling mirror in the measurement process rate, and the ordinate is the escape efficiency of the optical parametric oscillation cavity). The square data points in the figure are the escape efficiency results measured by the prior art, and the circular data points are the escape efficiency results measured by the technology of the present invention. The comparison of the two methods shows that the uncertainty of the measurement result of the technology of the present invention is about 0.3%, and the uncertainty of the measurement result decreases with the increase of the escape efficiency of the optical parameter oscillation cavity.
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