短脉冲染料激光器反馈隅合腔的光模特性及选择

本文研究了短脉冲染料激光器反馈耦合腔的光模特性,提出了在这类激光器中存在两种不同的可能运转模式:其一为准高斯光束基模形式运转。在这种情况下,当实现准基模运转时,激光器的输出激光特性最佳;另一为放大的自发辐射形式运转。在这种情况下,激光器输出激光特性明显变坏。文中还给出了实现准基模运转的条件,并用实验验证了以上论点。从而提出了如何选择短脉冲染料激光反馈耦合腔。     

固体染料分布反馈激光器输出光脉冲时间特性数值分析研究

本文选用合理的初始条件 ,通过迭代求解一阶微分关联速率方程组 ,首次给出了掺R6G染料固态溶凝胶硅分布反馈激光器输出激光脉冲的时间特性及其随泵浦功率改变的变化规律。数值计算结果与实验结果吻合甚好     

由分布反馈产生超短脉冲的染料激光器

分布反馈染料激光器(简称DFDL)是七十年代发展起来的。Kogelnik及Shank等于1971年第一次将分布反馈体现在染料激光器中。经过多年的努力,特别是最近的研究证明DFDL是超短光脉冲产生的一种新途径。Zs.Bor等人用TEA N_2激光器泵浦DFDL获得了6ps的短脉冲输出,用锁模Nd:YAG激光泵浦DFDL产生了1.6～3.5ps转换极限的单脉冲。DFDL廉价、简便,该技术比锁模技术简单可靠,不需特殊的脉冲选择装置就可获得单脉冲,不用调制器就可直接产生微微秒脉冲,即使有几个脉冲,也可利用各脉冲的方向不同,方便地进行空间选取,     

光栅掠入射脉冲染料激光器工作特性的研究

本文研究了无反馈腔结构的高损耗脉冲染料激光器和一般光栅掠入射结构的脉冲染料激光器的输出特性,分别获得了时间平均频带宽度为1.2GHz和2.5GHz的输出,本文还讨论了激光频带与腔参数的依赖关系,给定了光栅掠入射染料激光器的最佳工作条件。     

ps单脉冲超强度的产生和返回放大

我们发展了一种新的猝灭技术——调制猝灭,利用延迟后的部分泵浦光的相干场,经过适当的空间相移,叠加到分布反馈染料激光器(DFDL)的原泵浦区,适时地消除DFDL中泵浦强度的轴向周期性调制,从而使分布反馈振荡自行终止。应用这一办法,在泵浦强度远高于阈值的情况下,可以方便而可靠地获得单个的ps脉冲输出。由于猝灭后的激活染料仍然处于高度     

适用于可调激光器的流动染料盒

阿符科·埃佛雷特研究实验室人员宣布,他们在可调激光器中引进了一种新概念——种流动染料盒,它能给出的平均输出功率达50毫瓦,而且还能随意互换。这项设计与该室的脉冲氮激光器系列一起使用,染料盒提供的重复率达500脉冲/秒,染料不需要急速流动或重新注入。     

用DFDL产生超短脉冲技术

分布反馈染料激光器(DFDL)是近年来较引人注目的二种激光器件,它以与常规激光器件不同的方式工作。从DFDL的工作原理分析及有关实验结果已经知道DFDL有很多吸引人的优点,尤其是利用DFDL产生超短脉冲技术。用DFDL产生ps脉     

脉冲式可调谐染料激光器的性能研究

本文给出脉冲式可调谐染料激光器的结构参数及其泵浦源的性能参数。重点介绍脉冲式染料激光器的波长覆盖范围及用光栅和法布里-珀罗标准具压缩谱线宽度等研究工作、实验结果及测试方法。简单给出染料激光器其他性能的实验数据。     

1975年IEEE/OSA激光工程和应用会议报告目录选辑

一、染料激光器:1.利用Nd:YAG激光泵浦的一种同步锁模染料激光器的非线性混合,放大和微微秒脉冲产生2.横向流动闪光灯泵浦染料激光器3.高功率染料激光器二、一般应用:1.利用光合成和塑料闪烁器的微微秒脉冲研究条纹相机2.高速辐射相机,利用一种脉冲横向模红宝石激光器和水合电子吸收现象3.激光手术应用4.可调激光器-生物学探头     

用转镜扫描系统测量脉冲激光的二维光强分布

设计了一种用转镜扫描法测量高重复频率脉冲激光器输出光强二维分布的系统，给出了高重复频率脉冲TEACO2激光器运场光强分布的测试结果。     

Controlled timewise redistribution of laser energy

An electronic feedback circuit is described which has been used in a Nd:glass high-power laser system for converting the spiky light emission into a smooth near-rectangular output of adjustable intensity and duration. The feedback circuit is also capable of converting the laser emission into a stroboscopic output of frequency of several hundreds of kilohertz or into aQ-switched high-intensity output. The attractive feature of the system is that the change from one type of laser operation into the other does not require any modification to the circuit, but only a simple readjustment of a few control knobs. The feedback system incorporates a high-current fast photodiode, a Pockels-cell shutter, and a pulser. The main innovation of the present electronic feedback circuit over previously proposed systems is the ability to set the Pockels cell at any point of its transmission curve. This feature will be demonstrated to be of decisive importance in smoothing out the laser emission and in converting the spiky light output into a series of periodic light pulses.     

有源光纤环形腔的频率滤波特性

本文首先从理论上通过简单的分析得以了有源光纤环形腔的输出谱密度函数公式，该式清楚地表明光纤环形腔的频率滤波特性。从该公式出发，详细分析了环形腔输入光纤宽和环形腔参数对输出光谱谱型和线宽的影响。最后，通过设计不同的环形腔的自由谱宽和不同线宽的激光器作为输出光源，对上述理论分析做了实验验证。理论和实验表明，由于环形腔的强度传递函数是多峰的响应函数，环形腔自由谱宽和输入激光线宽的大小直接影响到环形腔输出光频谱形状，即是单峰输出还是多峰输出，对于不同形状的光谱输出，输出激光的线宽受环形腔的参数影响也各不相同。     

Theory of the transmission of metal strip gratings on a dielectric substrate application to submillimeter laser coupling

The advantages of supported metal strip gratings with respect to free-standing metal meshes are pointed out for applications as laser output couplers. A new, simple formula for the power transmission through the strip grating on a dielectric plate is derived from a line equivalent-circuit model. This formula is in good agreement with measurements performed on several samples, at different submillimeter wavelengths. An application to output couplers of far-infrared gas discharge lasers allows to improve the reliability of such lasers.     

宽带可调谐双频移多波长布里渊光纤激光器

提出了一种采用高非线性光纤作为布里渊增益介质 的双倍布里渊频移间隔的多波长布里渊光纤激光器(MW-BEFL)。激光器利用两个环形器构成 双倍频移结构,将奇数阶的斯托克斯信号隔离在腔内循环,仅有泵浦 信号和偶数阶的斯托克斯信号能够耦合输出,实现了双倍布里渊频移的多波长输出。激光器 腔内没有引入 任何的有源增益介质对斯托克斯信号进行放大,消除了腔内自激模的影响。激光器的调谐范 围由布里渊泵 浦的工作波长和掺铒光纤放大器(EDFA)的增益带宽决定。实验中,在布里渊 抽运 功率为0dBm、EDFA的输出功率为20 dBm的情况下,在1536~1605nm之间得到双频移间隔的多 波长输出,调谐范围是69nm。     

Perovskite Origami for Programmable Microtube Lasing

Metal halide perovskites are promising materials for optoelectronic and photonic applications ranging from photovoltaics to laser devices. However, current perovskite devices are constrained to simple low-dimensional structures suffering from limited design freedom and holding up performance improvement and functionality upgrades. Here, a micro-origami technique is developed to program 3D perovskite microarchitectures toward a new type of microcavity laser. The design flexibility in 3D supports not only outstanding laser performance such as low threshold, tunable output, and high stability but also yields new functionalities like 3D confined mode lasing and directional emission in, for example, laser “array-in-array” systems. The results represent a significant step forward toward programmable microarchitectures that take perovskite optoelectronics and photonics into the 3D era.     

准连续波单频氩离子激光器特性的研究

脉冲氩离子激光器的研究早在六十年代就开始,但后来一直未能应用于实际。我们研制的这台激光器具有结构简单,造价低兼,输出功率较高等优点。 激光器的结构及放电电路如图1所示。激光器由放电管和贮气管两部分组成。放电管为一根长130厘米、内径4毫米的普通硬质玻璃管;阴极为一个钽制成的圆筒;阳极为铟电极。贮气管由一根直径8厘米的玻璃管制成,两端与阴极和阳极分别相连接,因而它还有回气管的作用。谐振腔为半外腔     

铜蒸气泵浦染料激光器输出功率与谐振腔结构的关系

一、引言 铜蒸气泵浦染料可调谐激光器具有重复率高、输出功率高等优点,是应用激光光谱中的重要激光器件。器件结构见图1。用Littrow光栅和平面镜组成了谐振腔。如图1的染料激光器的前腔板一般都采用平板玻璃(R=8％),其优点是装调方便,但考虑到染料槽的宽度只有0.3mm,光束的衍射角大(约2.5mard),因此谐振腔的衍射损耗大。在某些实际应用中,M_1与染料槽间往往还要留出一段距离以便插入光学元件,衍射损耗则将加大。为了提高器件的效率,我们采用凹面反射镜代替平板。     

Size-dependent output power saturation of vertical-cavity surface-emitting laser diodes

We demonstrate efficient vertical-cavity surface-emitting laser diodes with high output power levels. Improved output power in these pillar-etched devices is achieved through a 60% lower thermal resistance by using a 15-/spl mu/m-thick Au-plated heat spreading layer on the top surface with a size of 300/spl times/300 /spl mu/m/sup 2/. The maximum continous wave output power increases almost linearly with laser diameter, before it saturates at 42 mW for an unmounted Au-plated device of 64-/spl mu/m diameter. A simple analytical model describes the laser output characteristics and the size-dependent saturation behavior of the maximum output power.     

Room temperature Dy:YLF laser operation at 4.34 μm

A Dy:YLF laser operating on the ⁶H_11/2 to ⁶H_13/2 transition at 4.34 μm and using a laser pumping scheme is reported. This pumping scheme is necessitated by the short upper-laser-level lifetime and the small effective stimulated-emission cross section. A suitable laser for this application is the Er:YLF laser operating at 1.73 μm. A simple model that approximates Dy:YLF laser performance well is presented. Results on laser performance, including a determination of the slope efficiency and threshold as a function of the output mirror reflectivity and a correlation of the pulse length with the laser output energy, are reported. Overall laser efficiency is found to be limited primarily by the ratio of the pump wavelength to laser output wavelength and the terminated four-level laser operation     

利用Doppler展宽的Zeeman光谱实现钛宝石激光器的稳频

实现了一种可靠而又简单的用Doppler展宽的Zeeman光谱对连续单纵模钛宝石激光器进行稳频的方法.这种方法所需激光输出功率小于1 mW,激光器频率的长期稳定度小于1 MHz/h,且不受激光输出功率起伏的影响,频率锁定点可以在多谱勒展宽范围里随意调节.