共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
3.
Jianming Dai Weili Zhang Lizhe Zhang Lu Chai Yong Wang Zhigang Zhang Qirong Xing Ching-yue Wang Kenji Torizuka Tadashi Nakagawa Takeyoshi Sugaya 《Optics & Laser Technology》2001,33(2)
In this paper, a self-starting, diode-pumped self-mode-locked Cr:LiSGAF laser, which produced a stable pulse train of 45 fs duration with about 20 mW-average power at the repeated rate of 90 MHz, was presented. Self-mode-locked operation can be obtained whether there is the semiconductor saturable absorber mirror (SESAM) in the Cr:LiSGAF laser cavity or not, and with the SESAM in the cavity, the self-mode-locked operation could self-start. The shortest pulses, as short as 38 fs, which were not very stable, were obtain with the SESAM in the cavity. 相似文献
4.
5.
结合特殊的谐振腔设计和半导体可饱和吸收镜,建成了一台低阈值的自启动掺钛宝石激光器 . 分别用3%和12%的输出耦合镜,获得了阈值低至390mW和600mW的稳定锁模脉冲输出. 采 用12%输出耦合镜,在12W抽运时,输出平均功率为114mW,对应的典型脉宽为17fs,谱宽 为47nm. 相对于以往的低阈值克尔透镜锁模激光器,锁模工作的范围区域加宽,减小了操作 难度,提高了稳定性.
关键词:
低阈值
半导体可饱和吸收镜
克尔透镜锁模
掺钛蓝宝石激光器 相似文献
6.
讨论了自启动被动锁模掺Yb3+光纤环形激光器产生短脉冲的机理,并研制出全光纤结构超短脉冲掺Yb3+光纤环形激光器.采用两个976nm半导体激光器级联抽运作为抽运源,高掺杂浓度掺Yb3+光纤作为增益介质,利用光纤的非线性偏振旋转效应,得到自启动、十分稳定的ps量级锁模光脉冲.激光器锁模阈值功率260mW,输出功率25mW,锁模光脉冲中心波长1056nm,3dB带宽11.7nm,重复频率20MHz.与其他结构光纤激光器相比,这种全光纤结构具有更高的效率和更好的稳定性.
关键词:
环形光纤激光器
3+光纤')" href="#">高掺杂浓度掺Yb3+光纤
自启动
被动锁模 相似文献
7.
本文首先从二次谐波产生(SHG)过程中的一对耦合波方程出发,在理论上得到了当基波光以接近相位匹配的角度穿过倍频晶体时会产生自聚焦效应,并用类比方法得到了BBO晶体相应的非线性折射率系数.在实验上,据我们所知首次将BBO倍频晶体作为独立自聚焦元件用到了钛宝石激光器中,获得了一台较腔内不加晶体时的锁模阈值明显减小、锁模稳定性明显提高且具有自启动能力的自锁模钛宝石激光器. 相似文献
8.
建立理论模型,讨论了非线性偏振旋转全光纤锁模激光器的锁模过程、谐波过程以及导致激光器锁模运行难以稳定的影响因素.讨论了采用啁啾脉冲光谱滤波产生脉冲自振幅调制、增加激光器锁模稳定性和自启动能力的机理以及非线性偏振旋转与啁啾脉冲光谱滤波相结合实现锁模的物理过程和脉冲演化过程.研制出全光纤结构的超短脉冲掺Yb~(3+)光纤环形激光器,采用非线性偏振旋转和啁啾脉冲光谱滤波相结合的锁模技术,实现了激光器锁模的开机自启动和高稳定运行.对激光器进行了长期运行稳定性、锁模开机自启动能力、锁模输出参数可重复性监测.锁模脉冲中心波长1052.9 nm,谱宽9.1 nm,脉冲能量4.25 nJ,脉冲宽度17.8 ps.运行期间,各参数波动均小于0.3%.开机自启动能力和可重复性测试显示,激光器可实现一键自启动,启动后各参数可重复精度在0.55%以内. 相似文献
9.
10.
11.
在考虑增益、损耗、群速度色散、自相位调制、快速可饱和吸收体等各种参数同时作用情况下,分析了非线性偏振旋转效应自启动锁模机理,研究了腔体参数与锁模脉冲之间的关系,并给出飞秒被动锁模环形腔掺Er3+光纤激光器实验原理。实验采用性能稳定的980nm半导体激光器作为抽运源,高掺杂短长度掺Er3+光纤作为增益介质,利用非线性偏振旋转锁模技术,得到了稳定的飞秒自起振锁模光脉冲。抽运功率为23mW时,激光器输出锁模脉冲中心波长1552nm,3dB带宽为7.6nm,重复频率14.0MHz,平均输出功率0.43mW,自起振锁模泵浦阈值功率11.5mW,并观测到了稳定的高阶锁模脉冲输出。该激光器与报道过的相同结构光纤激光器相比,自起振泵浦阈值低、脉冲能量高、稳定性好,且频谱边带幅度小。 相似文献
12.
M. G. Galushkin K. V. Mitin A. M. Seregin D. V. Zelenin V. V. Sinaĭskiĭ 《Optics and Spectroscopy》2006,101(6):986-990
The parameters of a self-starting Nd:YAG laser with an electrooptic shutter have been studied experimentally, and the possibility of applying this laser to pump an optical parametric oscillator has been analyzed. Spatial and frequency selection in the self-starting laser is shown to be important. 相似文献
13.
ZHANG Jian LI Jinghui JIANG Xing LIU Xiaoming PENG Jiangde 《Chinese Journal of Lasers》1995,4(3):229-234
LDPumpedQ-SwitchingandSelf-startingMode-lockedAllFiberLaser¥ZHANGJian;LIJinghui;JIANGXing;LIUXiaoming;PENGJiangde(Departmento... 相似文献
14.
15.
16.
We report the generation of 207-fs pulses with 1.2mW average power
at 1036nm directly from a passively mode-locked Yb-doped fibre
laser with a nonlinear optical loop mirror for mode-locking and pairs
of diffraction gratings for intracavity dispersion compensation.
These results imply a 4-fold reduction in pulse duration over
previously reported figure-of-eight cavity passively mode-locked
Yb-doped fibre lasers. Stable pulse trains are produced at the
fundamental repetition rate of the resonator, 24.0MHz. On the other
hand, this laser offers a cleaner spectrum and greater stability and
is completely self-starting. 相似文献
17.
Using a modified ABCD-matrix approach accounting for nonlinear refraction in active medium,the ranges of cavity parameters that provide a mode-locking of Yb∶KYW-laser in usual z-fold cavity configuration are determined.Taking the cavity parameters that provide a most efficient mode locking and based on fluctuation model,a numerical simulation of laser operation is performed.In the calculations the side-band pump power of 6W at 982 nm is used in 1 cm length KYW crystal with 1 cm×0.005 cm beam cross section.Calculations show that self-starting operation is possible with these parameters and dispersion compensation allows for bandwidth-limited ultrashort pulse generation.The shortest pulse duration was determined to be about 200 fs with self-starting buid-up time of 130 μs.Such a built-up time is comparable and even shorter than that one for the lasers with semiconductor saturable absorbers.The region of negative dispersion provided by prism pair for a stable ultrashort pulse generation was determined to be (-17000~-42000)fs2. 相似文献
18.
研究了二极管端面泵浦的附加脉冲锁模的Nd:YAG激光器并分析了脉冲压缩原理及自启动机制,在最大泵浦功率为2.4W时,得到重复频率为134MHz、脉宽为2ps、有效输出功率76mW、相应峰值继283W、波长为1.053μm、波长为1.053μm的稳定的连续模脉冲序列。 相似文献
19.
Self-starting 6.5-fs pulses from a Ti:sapphire laser 总被引:7,自引:0,他引:7
Jung ID Kärtner FX Matuschek N Sutter DH Morier-Genoud F Zhang G Keller U Scheuer V Tilsch M Tschudi T 《Optics letters》1997,22(13):1009-1011
We demonstrate self-starting 6.5-fs pulses from a Kerr-lens mode-locked Ti:sapphire laser with 200-mW average output power at a pulse repetition rate of ~86 M Hz. This is to our knowledge the shortest pulse ever generated directly from a laser. For dispersion compensation we used a prism pair in combination with double-chirped mirrors, which balances the higher-order dispersion of the prism pair and therefore flattens the average total group-delay dispersion in the laser cavity. For self-starting mode locking we used a broadband semiconductor saturable-absorber mirror. 相似文献
20.
S. Naumov E. Sorokin V.L. Kalashnikov G. Tempea I.T. Sorokina 《Applied physics. B, Lasers and optics》2003,76(1):1-11
We report stable self-starting near-transform-limited 26-fs pulses at 250-mW output power from a Kerr-lens mode-locked (KLM)
Cr4+:YAG laser using chirped mirrors in combination with prisms. The highest output power achieved in KLM regime was 600 mW at
55-fs pulse duration. The experimental results agree well with the results of theoretical analysis with respect to KLM self-starting
ability and stability against continuous-wave and multi-pulse operation. Parameter ranges for stable transform-limited KLM
pulses as well as the shortest achievable pulse durations are established. Using an InGaAs-InP semiconductor saturable absorber
mirror we could obtain self-starting 57-fs pulses at the average output power of 200 mW. Two-photon absorption was found to
be the main mechanism favoring the multiple-pulse operation.
Received: 2 May 2002 / Revised version: 16 July 2002 / Published online: 8 January 2003
RID="*"
ID="*"Corresponding author. Fax: +43-1/58801-38799, E-mail: sorokina@tuwien.ac.at 相似文献