掺镱钨酸钇钠晶体激光特性研究

发布时间：2018-01-27 04:27

本文关键词： Yb:NaY(WO4)2晶体调Q 调Q锁模二硫化钼 SESAM　出处：《济南大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,随着高亮度、高功率的In Ga As激光二极管的快速发展,很多研究人员的研究兴趣逐渐集中到适用于产生超短强激光脉冲的掺镱(Yb3+)激光晶体上。以掺Yb3+激光晶体作为激光介质的全固化高功率超快激光器因其光转换效率高、性能可靠、噪声特性好、频率稳定、输出功率高、集成化、小型化等优势,被广泛的应用于工业切割、激光武器、激光通信以及科学研究等各个领域。本论文主要对Yb:Na Y(WO4)2晶体的激光特性进行系统全面的研究,采用光纤耦合的半导体激光器作为抽运源,以掺Yb3+的钨酸钇钠激光晶体为增益介质,研究了Yb:Na Y(WO4)2激光器的连续、调Q、腔倒空、调Q锁模、连续锁模等多种方式的激光特性。主要研究内容如下:1.首先介绍了固体激光器的优点与应用,然后概述了Yb3+和掺Yb3+激光晶体的特性和优点,并综述了掺镱(Yb3+)的固体激光器的研究现状和进展。2.对Yb:Na Y(WO4)2晶体的晶体结构和连续激光特性进行了系统研究:首先分析了Yb:Na Y(WO4)2晶体的晶体特性和研究进展,然后简单介绍了Yb:Na Y(WO4)2晶体生长方法,最后研究了LD抽运的Yb:Na Y(WO4)2晶体在1μm波段的激光特性,分析了连续激光输出时的功率和光谱特性。当连续运转的最大抽运功率为6.23W、输出镜透过率为5%时,Yb:Na Y(WO4)2激光器输出的最大功率为1.1W,光光转换效率为17.7%,斜效率为34.5%,输出光束为线偏振光。透过率为1%和5%时,激光波长分别分布在1044-1052nm和1054-1062nm之间。3.研究了不同调制器件对LD抽运的Yb:Na Y(WO4)2晶体的调Q激光输出脉冲宽度和输出功率的影响。将声光调制器插入到LD抽运的Yb:Na Y(WO4)2激光器中,实现稳定的声光调Q激光运转,实验中得到在重复率为10k Hz、抽运功率为8.6W时,激光器的平均输出功率为180m W,脉冲宽度为398ns,计算得到单脉冲能量为18μJ,峰值功率为0.044k W;利用RTP电光调制器实现了Yb:Na Y(WO4)2晶体的电光腔倒空激光运转,获得最大平均输出功率为42.1m W,脉冲宽度随抽运功率和重复频率的增大几乎没有改变,脉宽稳定在5.3±0.4ns;制备了Mo S2可饱和吸收体,并实现了Yb:Na Y(WO4)2调Q激光运转,当抽运功率为10.37W时,得到70m W的平均输出功率,测得脉冲宽度为426ns,重复频率为135k Hz,计算出单脉冲能量和峰值功率分别为0.52μJ和1.2W。4.采用Z型折叠腔,用Yb:Na Y(WO4)2作激光晶体,声光开关作为调制器件,实现了LD泵浦Yb:Na Y(WO4)2声光调Q锁模激光运转。在泵浦功率为8.6W时,最大平均输出功率为203m W,斜效率为6.5%。5.通过优化设计谐振腔,研究了LD抽运Yb:Na Y(WO4)2晶体的SESAM连续锁模激光特性:利用透射式SESAM作为锁模器件,实现了Yb:Na Y(WO4)2晶体的锁模激光运转,在泵浦功率为8.6W时,得到164m W锁模脉冲输出,脉冲宽度为246fs,重复频率为35MHz,单脉冲能量为4.7n J,峰值功率为19.1k W;利用反射式SESAM作为锁模器件,采用W型腔,实现了Yb:Na Y(WO4)2晶体的锁模激光运转,在泵浦功率为7.83W时,平均输出功率780m W,脉冲宽度为524fs,重复频率为92.5MHz,单脉冲能量为8.4n J,峰值功率为16k W。
[Abstract]:In recent years, with the rapid development of In Ga with high brightness, high power As laser diode, the research interest of many researchers began to focus for producing doped ultrashort laser pulses (Yb3+) laser crystal. The Yb3+ doped laser crystal as laser medium solidified because of its high power ultrafast laser light conversion high efficiency, reliable performance, good noise characteristics, stable frequency, high output power, integration, miniaturization and other advantages, is widely used in industrial cutting, laser weapons, laser communication and various fields of scientific research. This paper mainly focuses on the theory of Yb:Na Y (WO4) are studied. 2 laser properties of crystals the use of fiber coupled semiconductor laser as pumping source with sodium yttrium tungstate laser crystal doped with Yb3+ as the gain medium of Yb:Na Y (WO4) continuous, adjustable Q 2 laser, cavity dumping, Q switched mode-locked, many continuous locking The characteristics of laser mode. The main contents are as follows: 1. firstly introduces the advantages and application of solid state lasers, and then summarizes the characteristics and advantages of Yb3+ and Yb3+ doped laser crystal, and summarized the Yb (Yb3+) solid laser research and development of.2. Yb:Na Y (WO4) 2 crystal and crystal structure continuous laser characteristics were studied: the first analysis of the Yb:Na Y (WO4) 2 crystal crystal properties and research progress, and then introduced the Yb:Na Y (WO4) 2 crystal growth method, finally the LD pumped Yb:Na Y (WO4) 2 crystal in the laser characteristics of 1 m wavelength, analysis power and spectral characteristics of CW laser output. When the maximum pump power of 6.23W continuous operation of the output mirror transmittance is 5%, Yb:Na Y (WO4) maximum power output is 2 1.1W, the optical conversion efficiency is 17.7%. The slope efficiency is 34.5%, the output beam is linearly polarized Through the rate of 1% and 5%, respectively. The distribution of laser wavelength between 1044-1052nm and 1054-1062nm.3. of different modulation devices of LD pumped Yb:Na Y (WO4) Q laser pulse output of 2 crystal width and output power. The acousto-optic modulator is inserted into the LD pumped Yb:Na Y (WO4) 2 laser, acousto-optic Q laser to achieve stable operation, obtained at 10K repetition rate in the Hz experiment, the pump power is 8.6W, the average output power is 180m W, pulse width of 398ns, calculated by the single pulse energy is 18 J, the peak power is 0.044k W; implementation of Yb:Na using Y RTP electro-optic modulator (WO4) 2 Crystal electro-optical cavity dumped laser operation, the maximum average output power is 42.1m W, the pulse width increases with the pump power and repetition frequency almost did not change in the stable pulse width of 5.3 + 0.4ns; preparation of Mo S2 saturable absorber, and realized Yb:Na Y (WO4) 2 Q laser operation, when the pump power is 10.37W, the average output power of 70m W is obtained. The measured pulse width 426ns, repetition frequency of 135k Hz, calculate the single pulse energy and peak power of 0.52 J and 1.2W.4. using Z Yb:Na Y type folded cavity. (WO4) 2 laser crystal, acousto-optic switch as a modulation device, to achieve the LD pumped Yb:Na Y (WO4) 2 acousto-optic mode-locked Q laser operation. When the pump power of 8.6W, the maximum average output power is 203m W, the slope efficiency is 6.5%.5. by optimizing the design of resonant cavity of LD pumped Yb: Na Y (WO4) 2 crystal SESAM CW mode-locked laser characteristics: the use of SESAM as the transmission mode locking device, the Yb:Na Y (WO4) 2 Crystal mode-locked laser operation, when the pump power of 8.6W, 164M W mode-locked pulse output, pulse width 246fs, repetition frequency of 35MHz, single the pulse energy is 4.7n J, peak power 19.1k W; the use of reflective SESAM as mode locking device, using W cavity, implementation of the Yb:Na Y (WO4) 2 Crystal mode-locked laser operation, when the pump power of 7.83W, the average output power of 780m W, pulse width 524fs, repetition frequency of 92.5MHz, single pulse energy of 8.4n J peak the power is 16K W.

【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN24

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