宽频带掺钕硅玻璃调Q振荡器

采用二片小峰简并型共振反射器作为硅玻璃振荡器的耦合输出镜,利用其反射调制包络特性,实现了带宽10.0nm以上的激光输出,实验研究了宽带输出特性。     

Nd: phosphate glass mode-locked oscillator and amplifier system

A 100-mJ 6-ps pulse was produced from a mode-locked oscillator and an 8 in long amplifier system using Kigre Q-88 Nd: phosphate rods.     

An actively mode-locked/Q-switched Nd:phosphate glass laser oscillator

Good stability and reliability is achieved in the operation of a laser oscillator with Nd-doped phosphate glass that is actively mode-locked, as well as activelyQ-switched. It delivers a single pulse at 1.053 μm with an energy of 140μJ. Pulse duration is variable between 150 ps and 1.1 ns. The system offers a TTL trigger well related to the Single pulse.     

Short-pulse, eye-safe Nd:YAG laser using cavity-dumping

A short-pulse 1.444-μm laser based on Nd:YAG technology has been demonstrated. The 1.444-μm is eye-safe. With the cavity-dump technique, a pulse of 50 m× and 14 ns was obtained. The beam quality was excellent with an M² of 1.6 by the use of a telescopic resonator. Silicon-window polarizers were used to suppress the 1.06-μm radiation but showed 1.444-μm absorption as well     

Characteristics of an Nd:CaLaSOAP mode-locked oscillator

Neodynium doped calcium lanthanum silicate oxyapatite (Nd:CaLaSOAP) has properties intermediate between Nd:YAG and Nd:glass that make it desirable for use as a pulsed-mode-locked oscillator at 1.06 μ. Time resolve spectroscopy, high speed image converter streak recordings, and two-photon fluorescence pulse duration measurements were used to investigate the output of such a laser. Pulse durations from 5 to 15 ps were observed under different operating conditions.     

重复率脉冲掺钕磷酸盐激光玻璃系列

研制了三种具有高受激发射截面、热光稳定的磷酸盐激光玻璃.给出主要光谱参数和激光性能.该玻璃已获应用.     

Optoelectronic oscillator for photonic systems

We describe a novel photonic oscillator that converts continuous-light energy into stable and spectrally pure microwave signals. This optoelectronic oscillator (OEO) consists of a pump laser and a feedback circuit including an intensity modulator, an optical-fiber delay line, a photodetector an amplifier, and a filter. We present the results of a quasi-linear theory for describing the properties of the oscillator and their experimental verifications. Our findings indicate that the OEO can generate ultrastable, spectrally pure microwave-reference signals up to 75 GHz with a phase noise lower than -140 dBc/Hz at 10 KHz. We show that the OEO is a special voltage-controlled oscillator with an optical-output port and can be synchronized to a reference source by means of optical injection locking, electrical injection locking, and a phase-locked loop. Other OEO applications include high-frequency reference regeneration and distribution, high-gain frequency multiplication, comb frequency and pulse generation, carrier recovery, and clock recovery     

Simple single longitudinal mode Q-switched Nd:YAG oscillator

A simple three-mirror resonator is considered for longitudinal mode control in a passivelyQ-switched Nd:YAG laser. This configuration provides temporally smooth output pulses with duration determined by dye concentration and continuously variable from 300 to 10 ns. Previous problems with spatial beam quality can be minimized by careful arrangement of cavity components.     

Passively Q-switched Nd:glass fibre-bundle laser

The performance of a flashlamp-pumped fibre-bundle laser passively Q-switched by a Cr⁴⁺:YAG crystal is reported. Simultaneous passive Q-switching of 250 highly Nd-doped multimode phosphate glass fibres delivers pulses with 35 ns duration at a rate of 20 kHz. The generated Q-switch pulses are strongly modulated by a train of pulses <500 ps with high peak powers exceeding 1 MW     

转动玻璃圆筒激光器

本文介绍了转动玻璃圆筒激光器的设计及实验结果,得到了脉冲能量为13J,重复频率为15Hz的激光输出。电光转换效率为2.2％,斜效率为3.4％。     

重复频率泵浦钕玻璃放大器的热性能分析

重复频率激光放大器在重频工作条件下,激光增益介质的温度升高会影响其放大能力,其内部的温度梯度会影响激光光束的光学质量,甚至会发生激光增益介质的热破坏。对国产抗热冲击钕玻璃棒工作在一定频率下的温度分布和波前畸变进行了数值分析,讨论了国产抗热冲击型钕玻璃棒在重频下的工作性能并进行了实验验证。理论和实验结果表明:在1800J的氙灯泵浦能量条件下,Φ16mm×216 mm的钕玻璃棒(掺杂0.5%)在0.1 Hz工作条件下,钕玻璃棒在3 min左右就可达到热平衡,其波前畸变量为0.5λ;在400 mJ(5 ns)的注入能量条件下,其输出能量为1.2 J。     

Nd~(3+)玻璃激光器选模调Q技术的实验研究

目前国内外已有不少报道以YAG或YLF等晶体为工作介质进行预激光调Q选单纵模,并取得良好的效果,而用Nd~(3+)玻璃为工作介质进行这方面工作的报道尚属少见。众所周知,单纵模的获得是以单横模为前提的,为此我们在钕玻璃激光器上首先进行了选模(横模)调Q技术的实验,很容易就获得方向性极好的TEM_(00)模或某一低价横模的高功率激光输出,实现了     

Continuous wave thin plate Nd:glass laser

CW (continuous-wave) operation of end-pumped four-level glass lasers is modeled to obtain expressions for threshold, slope efficiency, and figures of merit. The thermal effects ultimately limiting performance in these lasers is also discussed. Basic design consideration for optimum performance of an end-pumped CW Nd:glass laser intended for mode locking are presented. On the basis of these investigations, a CW Nd:glass laser containing a heavily doped thin phosphate glass plate as the gain material has been built. The plate was inserted into a folded cavity and pumped longitudinally by a Kr laser at 0.8 μm. With 2.5% output coupling the pump threshold and the slope efficiency well above threshold were measured to be 10.5 mW and 36%, respectively. These values agree reasonably with theoretical predictions. Experimental confirmation of the predicted thermal limiting effects are also obtained     

单段钕玻璃激光放大器的计算模拟

进行了单段钕玻璃激光放大器（ＳＳＡ）的计算模拟。该计算软件引入时间因子,可优化设计放电网络参数,能根据电容器储能直接计算出储能效率和储能密度等重要激光参数,用ＬＬＮＬ的实验结果作了校核,并有较强的预测能力。     

Nd:YVO4板条激光器可在玻璃内部进行加工

玻璃在很宽的光谱范围内为透明状，因此用激光束在玻璃上打标是一项具有挑战意义的技术。为使在玻璃上所施加的辐射能被有效地吸收，例如可以采用紫外光，也可以采用非线性吸收的办法达到这一目的。几年前开发的在玻璃上打标的方法就是依赖于高峰值功率激光脉冲的非线     

2kJ高能量钕玻璃激光器的热管理技术分析

为了进一步提高激光器输出功率,针对脉冲串工作的2kJ高能量钕玻璃固体激光器,采用有限差分法,对比研究了传统恒温水冷方式和采用传统水冷与加热控制相结合的新型热管理技术下的激光棒温度分布情况.结果表明,采用新型热管理技术可以降低激光棒内的温度梯度,确保高能量激光输出.     

高指向稳定性的钕玻璃调Q激光器

本文讨论了激光束指向稳定性的重要意义,报导了调Q钕玻璃激光振荡器的指向稳定性优于20″/20天.     

Spectroscopy and laser operation of Nd:ZBAN glass

The results of a study of the spectroscopic and laser properties of a Nd³⁺ doped fluoride glass are presented. Threshold energies and slope efficiencies are reported along with the stimulated emission cross section for the laser transition. The effect of excited state absorption of pump photons on the slope efficiency is investigated     

Compact, single-frequency, high-power Nd: glass laser

A compact, single-frequency high-power Nd:glass laser was developed. Single longitudinal mode operation of the oscillator was provided by injection-seeding it with CW laser radiation. A four-pass amplifier with a spatial filter provided an output energy of 2.7 J with more than 30% extraction efficiency. The output beam divergency was twice the diffraction limit     

Feedback stabilized actively mode-locked Nd:phosphate glass laser

An electrooptic, actively mode-locked Nd: phosphate glass laser system is described employing a novel single-step feedback system to stabilize the pulse buildup time. Single output pulses of ∼100 ps duration with energies of up to 1 mJ could be reliably generated with a standard deviation in thesim3.2 mus pulse buildup time of ±40 ns allowing synchronization with pulses from laser systems at other wavelengths. Evidence of pulse broading due to self-phase modulation was observed together with wide tunability of the output wavelength from 1.054 to 1.068 μm.