卤化铜激光纵向泵浦窄线宽染料激光器的研究

本文详细描述了 ＣｕＢｒ蒸气激光泵浦的、具有透镜和棱镜扩束、由Ｌｉｔｔｒｏｗ光栅调 谐的新型纵向泵浦染料激光器的设计和工作性能。对Ｒｈ６Ｇ染料，获得了线宽小于 ０．０１ｎｍ重复脉冲频率为１６ｋＨｚ，散射光少、超辐射光弱．发散角小的高质量可调谐染 料激光。本文指出了透镜能够压窄线宽所满足的必要条件；推导了耦合输出镜最佳反射 率和泵浦功率损耗，浓度等参量的关系。理论指出，若进一步增加泵浦功率和提高腔中 光学元件的性能，转换效率将明显增加。     

全光纤激光器中光栅作为腔镜的特点研究

选用介质膜作谐振腔镜,光纤激光器就缺乏有效的选频机制,使得输出激光线宽较宽,纵模频率和输出功率不够稳定;而光纤光栅作为激光器的谐振腔镜,可以得到稳定的窄线宽激光输出.通过对光纤光栅的形成机理和布拉格光栅选频原理分析,得到双布拉格光纤光栅线型谐振腔的理论.光纤光栅谐振腔的长度与光纤光栅中心波长满足S=(2m-1)λmax...     

30Hz单模超窄线宽光纤激光器

介绍利用光子注入锁模技术在掺铒光纤激光器上实现了超窄线宽单模激光输出;对光子注入锁模技术压缩激光线宽的原理进行了理论分析,讨论了饱和吸收形成的瞬态光纤光栅的参数对激光线宽产生的影响,实现了高边模抑制比的激光输出. 在实验中,通过调节泵浦功率,获得了稳定的单纵模及多纵模激光输出,测量显示输出激光的线宽为30Hz,输出最大功率可达2mW,多纵模时自由光谱范围FSR为1.875kHz.     

偏振耦合实现分布反馈光纤激光保偏输出

提出了一种通过偏振模式耦合方式实现分布反馈光纤激光器保偏输出的方法,分布反馈光纤激光器是由刻写在有源光纤上的相移光栅构成的一种窄线宽光源。由于侧面紫外曝光过程造成的光纤极化,这种光纤光栅激光具有线偏振特性,但光路结构一般是由单模光纤构成,因此激光的线偏振特性无法保持。通过监测激光偏振耦合输出功率,可以间接识别激光线偏振方向,将激光线偏振方向和保偏尾纤二次耦合熔接,可以实现窄线宽分布反馈光纤激光的保偏输出。实验得到了偏振消光比大于30 dB,输出稳定线偏振光的分布反馈光纤激光器,且激光效率、线宽、噪声等较原始单模输出时均未发生明显变化。     

窄线宽可调谐半导体激光器

研究了一种利用光栅弱耦合外腔改善可见光半导体激光器性能的方法,并对６５０ｎｍ半导体激光器进行了实验,外腔镜由一个闪耀光栅构成,通过转动光栅角度,获得了窄线宽单模激光输出,谱线宽度０．１ｐｍ,线宽压窄比达９８００,边模抑制比＞２０,并且在约２０ｎｍ的荧光谱宽基础上得到约５ｎｍ波长的连续调谐范围     

846 nm半导体激光器线宽压窄的研究

研制了用于倍频蓝光的单模、可调谐的窄线宽光栅外腔反馈半导体激光器,它是由激光器底座、激光管组件、准直透镜组件和光栅组成.经过精密控制电流和温度,利用光栅反馈可获得激光单纵模输出,外腔的结构还使输出光的谱线宽度得以压窄.对研制的半导体激光器的特性测试表明,其输出功率稳定,阈值变小,模式单一稳定,波长可调谐,谱线宽度小于1 MHz.     

外腔半导体激光器的实验研究

本文报道了外腔半导体激光器的一些研究成果。利用闪耀光栅作反馈元件，对808nm波长的半导体激光器形成弱耦合外腔，实现了光谱特笥较好的窄线宽单模激光输出，线宽小于0.06nm，边模抑制比大于30dB，最大输出功率为35.4mW，总的光－光转换效率为46％。通过调整光栅转角，可以得到11.66nm的波长调谐范围。设计了光栅－反向镜联动结构，使外腔半导体激光器的输出方向不再随调谐而变化。     

棱镜组合系统色散率的理论计算

采用等光标法建立了二个棱镜组合系统三阶以内色散率的数学模型,为可调谐激光的线宽压窄提供了理论依据.     

基于SOA的高稳定度DWDM多波长光源

研究了利用SOA和取样光栅型梳状滤波器构成的直腔和环形腔结构,实现多个波长的光的稳定输出,输出光的波长间隔0.8nm,线宽小于0.3nm,各通道功率差别小于30μW,是可应用于密集波分复用（DWDM)光通信系统的一体化多波长激光光源。     

掺铒光纤激光器线宽压缩技术的研究

研究掺铒光纤激光器上实现的超窄线宽单模激光输出. 对复合环形腔压缩激光线宽的原理进行了理论分析,讨论了有源复合环形腔参数对激光理论极限线宽产生的影响,并对影响激光线宽的关键参数进行了实验验证,获得了稳定的单纵模激光输出,其线宽小于100Hz,输出最大功率可达2.779mW.     

光参量发生放大器中信号光线宽的理论分析

对泵浦光的光束质量影响信号光线宽加宽的物理机制进行了模拟计算和分析,结果表明,在锭离简并点处,信号光线宽较小,在简并点附近,信号光线宽急剧增大,泵浦光的发散角和偏轴方向的泵浦光对信号光线宽影响较大。     

用于光纤传感网的窄线宽多波长光纤光源研究

窄线宽多波长光纤光源是光纤传感系统中的重要光源,可同时为多路复用技术中的传感器阵列提供所需的多个工作波长．为此对多波长光纤光源的稳态输出进行了数值模拟,理论分析了未泵浦掺铒光纤长度对输出线宽的窄化作用．同时实验构建了一种带有单程反馈和线宽窄化机制的多波长光纤光源,测量分析了这2种机制以及激光腔输出耦合比对多波长输出结果的影响．实验实现功率谱不平坦度〈土3dB时,多波长个数可达27个,3dB线宽约0．06nm,波长在50GHz范围内整体连续可调．     

光纤延迟线对激光器线宽测量的影响及修正

针对延迟线长度对拍频测量法的影响进行了理论分析,并找出了延迟线长度不同时测量线宽和激光本征线宽的关系模型.在此基础上对自制的窄线宽光纤激光器纵模线宽进行了测量.使用消除延迟线长度对线宽测量的影响的数据修正方法,得到的激光器的本征线宽为5.74 kHz.之后将实测数据分别与利用该方法得到的功率谱线型和标准洛伦兹线型进行比较,证明这种修正方法能够更准确的反映激光通过延迟线后的线型.     

外腔法压窄半导体激光器线宽的二阶理论

对耦合于长无源外腔的半导体激光器的线宽行为进行了二阶理论分析，首次得到了 外腔半导体激光器的线宽压窄率随外腔长的增加而出现饱和的结论。并给出了饱和因子 的表述式。     

CsLiB6O10晶体光参量振荡器的线宽分析

采用355nm脉冲激光作为泵浦源,对影响CsLiB_6O_(10)晶体光参量振荡器的信号光线宽的各种物理机制进行了数值模拟计算和分析.结果表明,泵浦光的发散角和偏轴方向对信号光线宽的影响较大。     

Rayleigh backscattering: a method to highly compress laser linewidth

Ultra-narrow linewidth laser with several hun- dred hertz at room temperature has attracted a great deal of attention in recent years and played a critical role in both optical sensing and communication fields. In this paper, a new method based on Rayleigh backscattering to highly compress the laser linewidth was proposed and demon- strated theoretically and experimentally. By theoretical analysis and simulation, Rayleigh backscattering can be collected in any waveguide structure and all wave bands, which could have a revolutionary impact on the field of laser. A single-longitudinal mode fiber ring laser with 130-Hz linewidth was achieved with self-injection feed- back structure at normal atmospheric temperature. The linewidth compression based on Rayleigh backscattering lies in the fact that laser linewidth after scattering is narrower than that of incident light in high Rayleigh scattering structure. The self-rejection feedback method expanding free spectra range of laser cavity simultaneously was used to further suppress the mode-hopping and stabilizing output. Experimental results showed that the laser linewidth can be easily narrowed to hundreds of hertz with side-mode suppression up to 75 dB. This agrees with the theoretical analysis and simulation results qualitatively.     

A steady-state superradiant laser with less than one intracavity photon

The spectral purity of an oscillator is central to many applications, such as detecting gravity waves, defining the second, ground-state cooling and quantum manipulation of nanomechanical objects, and quantum computation. Recent proposals suggest that laser oscillators which use very narrow optical transitions in atoms can be orders of magnitude more spectrally pure than present lasers. Lasers of this high spectral purity are predicted to operate deep in the 'bad-cavity', or superradiant, regime, where the bare atomic linewidth is much less than the cavity linewidth. Here we demonstrate a Raman superradiant laser source in which spontaneous synchronization of more than one million rubidium-87 atomic dipoles is continuously sustained by less than 0.2 photons on average inside the optical cavity. By operating at low intracavity photon number, we demonstrate isolation of the collective atomic dipole from the environment by a factor of more than ten thousand, as characterized by cavity frequency pulling measurements. The emitted light has a frequency linewidth, measured relative to the Raman dressing laser, that is less than that of single-particle decoherence linewidths and more than ten thousand times less than the quantum linewidth limit typically applied to 'good-cavity' optical lasers, for which the cavity linewidth is much less than the atomic linewidth. These results demonstrate several key predictions for future superradiant lasers, which could be used to improve the stability of passive atomic clocks and which may lead to new searches for physics beyond the standard model.     

基于延时零拍法的DFB光纤激光器线宽测量

DFB单频光纤激光器输出的超窄线宽作为光学系统中的一个重要参数需要进行准确的测定,因此,采用延时零拍法重点对1053 nm波长的DFB掺Yb3 光纤激光器的超窄线宽进行了测量,并且研究了差拍光电流谱线的输出特性.针对超窄线宽DFB光纤激光器输出的特点设计了相应的光电转换放大电路,测得1053 nm的DFB光纤激光器的线宽为31 kHz.该测量结果对于窄线宽DFB光纤激光器应用于光纤传感、光纤通信领域具有一定的指导意义.