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1.
吴霞  杨苏辉  陈颖  赵长明  刘志杰 《光学学报》2012,32(3):314003-140
研究了一种激光二极管(LD)抽运的频差可调谐双频固体激光器,对耦合腔实现双频的方法进行了分析。实验中使用输入镜与腔内插入标准具形成耦合腔实现单频运转,双λ/4波片使单纵模激光频率分裂,通过改变两个λ/4波片快轴之间的夹角来实现频差调谐。在LD抽运光功率为290mW的条件下,获得了频差在0~1.1GHz范围内可调、功率为34mW的双频激光输出。  相似文献   

2.
研制了0~1.5GHz频差的LD泵浦双频固体激光器。利用端面泵浦和F-P标准具的选模作用得到单频连续输出,在单频基础上将λ/4波片加入谐振腔中,造成本征光频率分裂,实现频差连续可调的双频激光输出。采用琼斯矩阵分析光在腔内的本征值及本征向量,实现了定量分析模在腔内的相位延迟和偏振状态,定量计算双频频差大小。  相似文献   

3.
吴学健  尉昊赟  朱敏昊  张继涛  李岩 《物理学报》2012,61(18):180601-180601
利用光纤飞秒光频梳和外腔可调谐半导体激光器, 建立了一套双频He-Ne激光器频率测量系统. 选用铷钟作为系统的频率基准, 通过将外腔半导体激光锁定至光频梳使得其频率溯源至铷钟, 再利用外腔可调谐半导体激光与双频He-Ne激光器输出的正交偏振激光拍频, 同时测量两路正交偏振激光频率. 将可调谐半导体激光器锁定至光频梳第1894449个梳齿, 其绝对频率为473612190000.0±2.7 kHz, 相对不确定度为5.7×10-12. 对商品双频He-Ne激光器进行频率测量实验, 双频He-Ne激光器水平方向偏振激光频率均值为473612229934 kHz, 竖直方向偏振激光频率均值为473612232111 kHz, 平均时间为1024 s的相对Allan标准差为5.2×10-11, 频差均值为2.177 MHz, 标准偏差为2 kHz.  相似文献   

4.
崔柳  张书练 《应用光学》2007,28(3):328-331
研究了一种全新的纳米尺度位移测量系统。将双折射元件插入He-Ne激光器谐振腔内产生频率分裂效应,使原本单模谐振的激光器输出变成了频差可调的2个正交偏振频率(o光和e光),而形成双频激光器。在激光谐振腔外放置沿激光轴线位移的反射表面,将输出的激光束反射回腔内,以便对激光的光强进行调制,可实现高分辨率非接触式可判向位移测量。提出了一种细分方法,该方法突破了传统干涉系统的衍射极限(1/2波长)。对于633nm波长He-Ne激光,本系统的理想分辨率为1/8波长(约为79nm)。  相似文献   

5.
由兰姆半经典激光理论可知,固体激光器中两个模式能否同时振荡取决于两个模式之间的耦合程度,其定义为增益竞争引起的互饱和系数与自饱和系数之比。实验中,利用两个四分之一波片搭建了双频Nd…YAG固体激光器,实现了频差从30 MHz到1.3GHz连续可调的双频激光输出,在此基础上,测量了两正交偏振模式在不同频差输出条件下的噪声功率谱密度,计算出表征两个模式间增益竞争程度的耦合系数。理论上,根据兰姆半经典理论推导出耦合系数的表达式,验证了实验中耦合系数随着频差增加而减小的变化趋势,分析了影响耦合系数的因素,为进一步优化双频固体激光器提供理论基础。  相似文献   

6.
激光谐振腔内相位各向异性会引起频率分裂,两分裂模的频差大小由表现出的相位延迟所决定.对于腔内相位延迟较小的He-Ne激光器,两分裂模很接近,处于烧孔重叠区,存在模式竞争而不能同时振荡,形成隐频率分裂.同时,使得激光器两正交偏振方向上的相邻级纵模产生固定的变动量,其大小等于隐频率分裂量的2倍.如果沿激光偏振方向施加横向磁场,Ne原子谱线发生横向Zeeman分裂,增益原子分成两群,分别为平行于磁场和垂直于磁场方向偏振的光提供增益,大大减弱模竞争,使得激光器的两分裂模可同时振荡并测得频差.在谐振腔内放入倾斜的石英晶体片或半波片,由两种方法分别测量频率分裂量并进行比较.实验表明两种方法测量的结果均与理论计算相符,平均相对偏差不超过1%.据此可以准确得到Zeeman双频激光器的频差大小,并为半波片测量提供了新方法.  相似文献   

7.
在激光器谐振腔中放入单轴石英晶体,由于石英晶体对o光和e光的折射率的不同,所以,在同一谐振腔中o光和e光有不同的光程和谐振频率.将其称之为模式分裂效应.利用这一效应可以制成频率达几十兆赫兹的双频激光器.针对原有理论与实验结果之间的某些差异,建立了一套分析该种类型双频激光器的理论.根据所建立的理论着重分析了谐振腔光轴与晶轴夹角α对激光器频差的影响.并绘出了He-Ne激光管L<150nm和150nm相似文献   

8.
任成  杨星团  张书练 《应用光学》2012,33(6):1147-1152
 基于微片Nd∶YAG 正交偏振双频激光器,研究了若干重要的双频激光器腔调谐现象, 包括光强调谐、频差调谐、子谐振腔效应及频差闭锁等,给出了实验结果和数据。腔调谐下,正交双频的频差调谐量约为350 kHz;存在子谐振腔效应时,频差调谐量最大可达到2 MHz;未发现明显频差闭锁现象,频差最小值可达到14 MHz。  相似文献   

9.
设计了一种半外腔微片Nd∶YAG正交偏振双频激光器.把2个1/4波片置于激光谐振腔内,一个静止,一个作360°旋转,旋转引起2个1/4波片快轴之间的角度变化被激光器转化成激光2个频率之差的变化,从而输出可调谐的双频激光.采用琼斯矩阵对光在腔内的本征模进行分析,给出了双频频差的理论解释.讨论了一种体积小、分辨率高和可整周测量的新型Nd∶YAG激光测角仪的潜在前景.  相似文献   

10.
陈德彝  王忠龙 《物理学报》2008,57(6):3333-3336
用线性化近似的方法研究了噪声间关联程度λ受时间周期性调制的单模激光增益模型的光强功率谱及信噪比.具体讨论信噪比R受加法噪声强度D,乘法噪声强度Q及噪声间关联程度λ的影响,以及受周期调制频率Ωλ,输入信号频率Ω的影响.发现了一些新颖的现象. 关键词: 时间周期调制频率 噪声间关联程度 随机共振 信噪比  相似文献   

11.
刘芸  焦明星 《应用光学》2007,28(4):458-461
简要介绍了激光纵模分裂的基本原理,研究了腔内含有1个和2个1/4波片时产生Nd∶YAG激光纵模分裂的规律。实验结果表明:在1064nm Nd∶YAG激光的腔内放置一个1/4波片时,每一激光纵模分裂为2个正交的线偏振模,在波片表面垂直于激光光线的条件下,纵模分裂量(即频率差或波长差)恰好等于激光纵模间隔的一半;当在Nd∶YAG激光腔内沿垂直光线方向平行放置2个1/4波片时,也能产生纵模分裂现象,其纵模分裂量取决于2波片快(慢)轴之间的夹角。在0°~ 90°范围内调节角度,可使纵模分裂量在一个激光纵模间隔内线性调谐。实验结果与理论分析相吻合。  相似文献   

12.
In this letter, a thin slab of glass is used as Fabry–Perot etalon inside a cavity of a continuous wave (CW) Nd:YAG laser to change the behavior of its output longitudinal modes. The slab etalon is used as tuning element when it turns around the laser cavity axis. Two simultaneous longitudinal modes with a relatively wide tuning range from 5.83 MHz to 0.02 THz are obtained when the Nd:YAG laser is operated at moderate output power of about 120 mW. The mode structure of this configuration is modeled and simulated. Computer-generated diagrams are also presented schematically and compared with the experimental results.  相似文献   

13.
We propose a linearly frequency-tuning single-frequency Nd:YVO4 laser. We achieve a single-frequency tuning operation with a tuning range of 6.3 GHz and a maximum power of 0.5 W at 1,064 nm by tilting a thin coated etalon and changing the voltage applied to an RTP crystal in a synchronous way. The laser is linearly tuned with a standard frequency variation of 190 MHz. We estimate the average tuning speed to be 0.81 GHz/s. The tuning range obtained is more than three times the longitudinal mode spacing of the laser resonator.  相似文献   

14.
1 Introductionace--pumped SOlid-state laser (DPSL) have given rise to an attractive researchinterest and become one of the research focus in the field of laser due to theiradvantageS, such as high efficiency, compactness, steadiness, lOng lifetime and allsolldstate construction. The dual--frequency laser belongs tO the rather complex andadVanced techniqUe. It is applied widely in precise interferometry, laser ranger, laserradar, and heterodyne vibrometry.At present, there are lotS of pape…  相似文献   

15.
Dual-frequency laser resulting from fine detuning twisted-mode cavity is discussed in this paper. Two measurement systems, a Fabry-Perot etalon and a confocal spherical interferometer, are adopted. The former reflects directly the interferogram of multimode and single mode. The latter can judge accurately the mode spectrum of single frequency and dual-frequency laser. Moreover, the experimental results provide the relationship between frequency difference and the angle of the relative rotation of the two quarter-wave plates and agree well with the theoretical analyses. The range of difference frequency is from 50 MHz to 1 GHz.  相似文献   

16.
Using the mode splitting that can be achieved by exploiting the effect of photoelasticity and the mode selection properties of coupled resonators, single- and two-frequency operation of a diode pumped cw YAG:Nd3+ laser was observed. In the two-frequency case, a regime with two orthogonal linearly polarized modes was realized. The frequency difference between the adjacent modes could be varied from 50 MHz to 8.4 GHz. A maximum laser output power of 12 mW was achieved at a pump level of 240 mW . Received: 1 November 2002 / Revised version: 14 January 2003 / Published online: 19 March 2003 RID="*" ID="*"Corresponding author. Fax: +375-17/2840-879, E-mail: ryabtsev@dragon.bas-net.by  相似文献   

17.
A Brillouin fiber laser (BFL) consisting of a fiber ring resonator with different fiber temperatures emits two-frequency light output. The two-frequency BFL yields an optical beat output which can be utilized as an optical frequency shifter. The output beat frequency is controllable by the temperature difference in the fiber ring resonator and changes with a step of a resonant frequency interval of BFL. The temperature dependence of the BFL output frequency was 2.4 MHz/°C. The stability of the output beat frequency to the temperature fluctuation was estimated as 1.04°C/2.5 MHz.  相似文献   

18.
We report on to our knowledge the first time a diode-side-pumped simultaneous dual-wavelength Nd:YAG laser at 1116 and 1123 nm. By inserting an etalon to balance the gain and loss, a stable dual-wavelength oscillation is acquired. The numerical simulations for wavelength tuning are discussed by principles of laser threshold and Fabry-Perot etalon. Under the pump power of 250 W, a total output power of 23 W is obtained. Meanwhile, the two components have approximately equal intensities. The beam quality of M2 factor was measured to be 7.52.  相似文献   

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