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本文描述了利用KTP晶体和腔的基波输出镜构成非线性镜实现1.08μmNd:YAP激光器的被动锁模。实验表明,这种新的锁模技术比用染料作可饱和吸收体的被动锁模技术有很多突出的优点,具有很大的发展潜力。实验测得锁模时基波1.08μm输出2.4mJ,二次谐波0.54μm输出0.5mJ(同样条件下的静态输出为2.5mJ),基波脉冲的平均脉宽为40ps。 相似文献
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1.319μm连续固体锁模激光器 总被引:3,自引:0,他引:3
报道了1.319μmNd:YAG连续锁模激光器的技术研究。激光器的谐振腔为低热敏腔,用声光振幅调制器作为锁模元件,泵浦腔具有较高的泵浦效率和输出稳定性,获得了重复频率100MHz,平均功率~0.54W,脉宽<170ps的光脉冲。 相似文献
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利用对撞脉冲锁模非稳腔Nd:YAG激光器,采用KTP非线性晶体作腔外倍频,结合受激拉曼散射技术,在一台锁模激光器同时得到1.06μm,0.53μm,0.63μm超短光脉冲的输出。 相似文献
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采用10GHz基准时钟光和10Gbit/s的数据脉冲信号光注入到锁模激光二极管,降低了周期抖动,当注入功率为-5dBm,在基准时钟光波长等于锁模激光二极管的光波长时,获得的最小抖动为0.25ps,采用混合锁模激光二极管,在注入功率为+27dBm时,其Q值达3000. 相似文献
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采用10GHZ基准时钟光和10Gbit/s的数据脉冲信号光注入到锁模激光二极管,降低了周期抖动,当注入功率为-5dBm,在基准时钟光波长等于锁模激光二极管的光波长时,获得的最小抖动为0.25ps,采用给锁模激光二极管,在注入功率为+27dBm时,其Q值达3000。 相似文献
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本文乎次利用GaAs光电导开关,控制Nd:YLF激光器腔内的Q值,实现自锁模。稳态自锁脉冲序列长50μs,单脉冲脉宽为10ps,能量为0.1μJ。 相似文献
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氢化—AFS法测定青藏高原中草药中的微量砷,锑,硒和汞 总被引:24,自引:0,他引:24
索有瑞 《光谱学与光谱分析》1997,17(5):103-107
本文研究了氢化物发生无色散原子荧光法测定青藏高原中草药中的微量砷,锑,硒和汞的方法,在选定的最佳工作条件下,14种干扰元素的含量低于允许存在量,不影响测定,检出限(μg/mL)为:As1.3,Sb0.39,Se0.24,Hg0.44,9次测定的相对标准偏差(%)的为As2.4~4.2Sb2.5~5.6,Se3.1~5.0,Hg3.8~5.9。4个元素的回收率为94.7~105.4%本方法简便,快速 相似文献
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用多模干涉原理分析和设计了光通信波长(1.30μm~1.55μm)的Si1-xGex/Si滤波器,并用模的传播分析方法对其传输特性进行了研究。结果发现,在Ge含量x=0.04时,干涉区的脊高和宽度分别为6.35μm和8μm。如果多模干涉区长度LM=2302.5μm,可滤1.30μm而通1.55μm的波长。且具有31dB的对比度和0.01dB的插入损耗;如果多模干涉区长度LM=2512.5μm,可滤1.55μm而通1.30μm的波长。具有16dB的对比度和0.09dB的插入损耗。 相似文献
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设计加工了一个紧凑型L波段磁绝缘线振荡器(MILO)并进行了实验研究。该MILO具有一个新型收集极和一个新型模式转换器,射频扼流腔减为一个,同时将阴极杆设计成变阻抗结构,该MILO由一台自建的600kV,8Ω,100ns加速器SPARK01驱动。在二极管电压为515~538kV, 二极管电流为58~61kA的条件下, 该MILO在实验中获得了1.76~1.78GHz, 2.2~2.5GW的TM01模高功率微波辐射, 功转换效率为7.3%~7.9%。在30ns的有效电压脉宽下,实验中测得微波脉冲半高宽为15ns。实验结果与模拟结果符合得较好。 相似文献
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针对激光二极管阵列提出了"组合模"概念,计算了组合模的远场分布.每个组合模在远场的空间分布呈双瓣结构.基于激光二极管阵列组合模的远场分布特征,设计了离轴外腔反馈的激光二极管阵列.运用此装置所获得激光二极管阵列的远场分布有了明显变化.与自由运转的激光二极管阵列相比,离轴外腔反馈的激光二极管阵列远场宽度减少了4.3倍.在抽运电流为16 A时,测得输出激光的功率1.82 W,这相当于相同电流下自由运转激光器输出功率的79%.组合模理论不仅可以用来指导设计一维离轴外腔反馈激光二极管阵列,而且也可以用于设计二维离轴外腔反馈激光二极管阵列.二维离轴外腔反馈激光二极管阵列可以产生高功率,高光束质量输出的激光. 相似文献
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J. L. Picqué S. Roizen H. H. Stroke O. Testard 《Applied Physics A: Materials Science & Processing》1975,6(3):373-379
A cryostat has been designed for the refrigeration of a semiconductor diode laser (presently GaAs), using a flow of helium gas with controlled temperature. The possibility of independent adjustment of the injection current and of the temperature of the GaAs laser support allows cw emission over a wide wavelength range (~100 Å for a given diode) while maintaining single-mode operation. A long-term frequency stability of ±30 MHz of the free-running single-mode laser has been obtained. By varying the dc injection current, it was possible to achieve linear scanning of the mode frequency, step by step or continuously, over at least 20 GHz without hopping. Possible applications in optical pumping and high-resolution spectroscopy are discussed. 相似文献
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Generation of tunable multi-wavelength optical short pulses using self-seeded Fabry-Perot laser diode and tilted multimode fiber Bragg grating 总被引:1,自引:0,他引:1
We experimentally demonstrate the simultaneous generation of tunable multi-wavelength picosecond laser pulses using a self-seeding configuration that consists of a gain-switched Fabry-Perot laser diode (FPLD) with an external cavity formed by a tilted multimode fiber Bragg grating.Dualand triple-wavelength pulses are obtained and tuned in a flexible manner by changing the temperature of the FPLD.The side mode suppression ratio larger than 25 dB is achieved at different dualand triple-wavelengths and the typical pulsewidth of the output pulses is ~70 ps.In the experiment,the wavelength separation can be narrowed to 0.57 nm. 相似文献
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Output characteristics of the pulse-periodic solid-state laser pumped by diode arrays at a pump pulse repetition rate of 8...512 Hz were studied. Three pump types are used: longitudinal raster-lightguide, transverse, and combined ones. Diode arrays with a pulse power of ~800 W, emitting area sizes of 5 × 25 mm2, and radiation divergence along two mutually perpendicular axes equal to 4° and 15°, respectively, were used as a pump source. The pump current pulse duration was varied within 100–350 µs. Three operating modes were studied: (i) free generation, (ii) passive Q-switch, and (iii) acousto-optic Q-switch ones. The lasing peak pulse power was (i) ~2 kW(free generation mode), (ii) ~1.5 MW (passive Q-switch mode), and (iii) ~100 kW (acousto-optic Q-switch mode). The highest average lasing power was 150 W at a pump pulse repetition rate of 512 Hz. The highest pulsed lasing energy was 0.65 J. 相似文献
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HONG Zhi CHEN Jun 《Chinese Journal of Lasers》2001,10(6):401-405
1 Introduction SemiconductorlaserarrayshavereachedhighoutputpowerofseveralWincontinuous waveoperation[1] ,butduetothepoorspatialcoherenceandbeam profile ,applicationsarelimited .Inordertoenhancethespatialcoherence,thenumberoftransversemodesmustbereduced ,w… 相似文献
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We analyze the properties of a high-current electron beam formed in an electron source based on a plasma-filled diode and a linear pulsed transformer. The beam parameters are determined by measuring bremsstrahlung X-rays and the beam current, as well as the photographs of the diode gap in the optical range, of the anode in X-rays, and beam autographs. A beam with a current of ~100 kA and a mean electron energy exceeding 0.7 MeV for an accelerating voltage amplitude of ~1 MV is obtained. The diameter of the generated beam is ~1 cm. The electron beam from the plasma-filled diode makes it possible to attain a high anode power density (>1010 W/cm2) for exciting shock waves, for obtaining high pressures, and for generating powerful X-rays. 相似文献
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Abstract An external cavity for the laser diode array with a conventional mirror in what we call two-time self-injection operation is presented. The external cavity consists of two lenses, a flat external mirror(EM) in the image plane of the array and a prism that is used as an output coupler. The single-lobed near diffraction-limited far field beam of a 1 W 10-stripe gain-guided LD array lies at 6.4°~9° with the external cavity operation in two-time self-injection mode, whereas at 2.5°~3.0° for its normal feedback operation. The width of the far field beam (FWHM) is 0.43° and 0.63° at driving current of 2 and 3.2 ×Ithr, respectively, much narrower than that in normal feedback operation, but at the expense of lower output power. The output of the system is very stable and insensitive to the tilt and position of the EM. 相似文献