共查询到20条相似文献,搜索用时 944 毫秒
1.
2.
3.
介绍了一种基于扩展外腔和主振荡功率放大架构的780 nm片上集成窄线宽半导体激光器的设计方法.在激光器结构设计描述的基础上,介绍了主振荡功率放大光路设计、隔离器参数设计、尾纤光路设计的方法与仿真结果.基于该设计完成了 780 nm片上集成窄线宽半导体激光器的研制,介绍了参数实现情况,并对基于零拍法的激光线宽测试方法和测... 相似文献
4.
本文从理论上分析了外腔半导体激光器的线宽压窄原理,用延时自外差法对外腔半导体激光器的线宽特性进行了测量研究,得到了线宽反比于激光器输出功率及外腔反馈率的实验结果. 相似文献
5.
6.
7.
《光学学报》2018,(10)
设计了两种用于单纵模光纤激光器的窄线宽全光纤环滤波器,其由超低反光纤光栅和1个(或2个)2×2光纤耦合器构成。从理论上推导出两种滤波器的反射率表达式,并且对其反射率、窄线宽和群时延特性进行了详细的数值分析和实验验证。研究结果表明:由超低反光纤光栅和光纤耦合器构成的单环滤波器具有高反射率、超窄线宽和大群时延特性,表现出良好的慢光效应。双环滤波器除了保持了以上良好特性,还因游标效应,共振幅度可调,相对单环滤波器,具有更大的有效自由光谱范围(FSR)、更大的边模抑制比(SMSR)以及不易跳模等特点。所研究的光纤环形滤波器具有窄线宽、结构紧凑和低成本等优点,可用作光纤激光器的反射腔镜来进一步压窄激光器线宽,尤其是当双环滤波器用作腔镜时,激光器的线宽更窄,模式更稳定。 相似文献
8.
研制了一种窄线宽光纤激光器.在有源相移光栅后加一段掺铒光纤,当用980 nm抽运光注入时,首先形成了分布反馈(DFB)光纤激光器,而残余抽运光将铒纤中铒离子从基态抽运到了激发态,对DFB激光实现了有效放大,实现了对残余抽运光的充分利用,节省了功耗、降低了成本;同时利用温控技术克服了DFB光纤激光器的温度敏感问题;将相移光栅黏贴于片状压电陶瓷(PZT)的表面实现了高频调制.实验研制的激光器的最高调制频率为2 kHz、输出功率为15.6 dBm,线宽为300 kHz.
关键词:
分布反馈光纤激光器
窄线宽
大功率
高频调制 相似文献
9.
10.
11.
Jianrui Li Lixia Xi Xianfeng Tang Jiachuan Lin Xia Zhang Hongqiao Cheng Xiaoguang Zhang 《中国光学快报(英文版)》2014,12(2):20601-13
The laser source is an important element whose properties have influence on the output performance of single sideband(SSB) optical comb based on recirculating frequency shifter(RFS).The theoretical and experimental results show that the tone-to-noise ratio(TNR),flatness,and stability of optical comb improve using laser source with narrower linewidth.In order to obtain the optical comb with TNR larger than 42 dB and degree of stability(DOS) smaller than-6.7 dB,external cavity laser(ECL) with linewidth from 100 kHz to 1 MHz is a trade-off choice. 相似文献
12.
Influence of laser linewidth on performance of Brillouin optical time domain reflectometry
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
The effects of optical sources with different laser linewidths on Brillouin optical time domain reflectometry (BOTDR) are investigated numerically and experimentally. Simulation results show that the spectral linewidth of spontaneous Brillouin scattering remains almost constant when the laser linewidth is less than 1 MHz at the same pulse width; otherwise, it increases sharply. A comparison between a fiber laser (FL) with 4-kHz linewidth at 3 dB and a distributed feedback (DFB) laser with 3-MHz linewidth is made experimentally. When a constant laser power is launched into the sensing fiber, the fitting linewidths of the beat signals (backscattered Brillouin light and local oscillator (LO)) is about 5 MHz wider for the DFB laser than for the FL and the intensity of the beat signal is about a half. Furthermore, the frequency fluctuation in the long sensing fiber is lower for the FL source, yielding about 2 MHz less than that of the DFB laser, indicating higher temperature/strain resolution. The experimental results are in good agreement with the numerical simulations. 相似文献
13.
Developments of narrow-linewidth distributed-Bragg-reflection (DBR) and distributed-feed-back (DFB) lasers are described. The design of a narrow-linewidth DBR laser is described in detail. Kl optimization from the viewpoint of narrow-linewidth operation and stable single mode operation is discussed. The linewidth dependences on cavity length, facet reflectivity and threshold current density are investigated. Some approaches to suppressing spatial hole burning in DFB lasers are described. 相似文献
14.
15.
本文讨论了光强非均匀分布的单模激光腔的输出频宽的计算方法。并针对腔内光强分布的两种不同模型,分析了频宽修正因子。 相似文献
16.
《Optics Communications》1986,58(6):413-416
The intrinsic linewidth of an injection locked flash-lamp pumped dye-laser has been measured to be equal to 3.5 MHz. This result which is, to our knowledge, the best one reported for a pulsed laser is however larger than the Fourier limitation. The frequency shift between the cw master oscillator and the pulsed laser is equal to 7.5 ± 1.0 MHz under usual experimental conditions. The narrow linewidth and the good frequency reproducibility makes this light source very promising for applications in non-linear spectroscopy. 相似文献
17.
We demonstrate a method for further reducing the cavity linewidth by the application of a small longitudinal magnetic field on the Rb cell. Because of the magnetic field multiple electromagnetically induced transparen- cies (EITs) are observed. The center EIT linewidth is measured as a function of the magnetic field. By utilizing the center EIT we narrow the cavity linewidth to 2 MHz which is half of the cavity linewidth without magnetic field. 相似文献
18.
Color center lasers in different alkali halide crystals were found to oscilate in one primary and one or two hole burning modes without using frequency selecting elements. Considering the measured dependence of the linewidth on the disturbing effects as temperature and pump power fluctuations a linewidth of 25 kHz for the free running single mode color center laser is expected. 相似文献
19.
实验研究了处于单周期振荡的光注入半导体激光器在频率等于单周期振荡频率一半的1/2次谐波调制下所产生的微波信号的特性.实验结果显示:在合适的注入条件下,处于单周期(P1)振荡的光注入半导体激光器可输出频率可达26.5 GHz、光谱具有单边带结构的光生微波信号,但微波信号的线宽比较宽(MHz量级);通过采用频率为单周期振荡频率一半的次谐波信号调制光注入半导体激光器,可将微波线宽从十几MHz压缩到几十k Hz.进一步分析了次谐波调制信号的功率以及频率对微波信号的相位噪声的影响,并在由次谐波调制信号的功率和频率构成的参数空间绘制出了能实现次谐波频率锁定的分布区域. 相似文献
20.
Resonator integrated optic gyro (RIOG), which employs narrow linewidth laser, is a high-accuracy inertial rotation sensor based on the Sagnac effect. The performance of RIOG is greatly affected by the frequency drift of narrow linewidth laser. A simple, effective method to measure the relative frequency drift of narrow linewidth laser based on delayed self-heterodyne technique is proposed in this paper. The measurement range and sensitivity can easily be satisfied by setting the length difference of the fiber segments between two interferometer arms. The relationship between the length difference and the frequency drift is derived based on the given principle of measuring the relative frequency drift. Then the laser frequency drift measuring setup is established and the experiment results demonstrate that a center frequency drift rate is less than 2 MHz/6.7 s under the room-temperature. Moreover, the measuring setup is applied to test the modulation coefficient of piezoelectric-transducer (PZT), and the modulation coefficient of 9.62 MHz/V is obtained, which satisfies the requirements of RIOG closed-loop operation. 相似文献