光泵CF_4 16μm激光器

本文介绍了我国第一台光泵 CF_416μm 激光器。该器件以 TEA CO_2激光器为泵浦源,以其9R(12)跃迁线泵浦长3.77m 吸收池内的冷却 CF_4分子,获得16μm 激光输出.泵浦光由低气压连续增益池压缩线宽,用限孔光阑得单横模,并与光泵腔良好模式匹配,用 KCl 棱镜分开泵浦光和16μm 光,在700mJ 的泵浦源能量下获得25mJ 超辐射输出能量。光量子转换效率7%左右.激光脉宽窄于150ns。整个器件可在约0.5Hg 重复率下,以20mJ 的能量稳定运转数千次。本文描述了低气压连续增益池对输出稳定性及效率的作用,CF_4池温度对激光输出特性的影响,得到 CF_4最佳运转压力及压力变化对16μm 激光脉宽的关系,泵浦源能量与16μm 输出的线性关系。文章还谈及用 CO_2的9R(10)线泵浦时的不同结果,并讨论那些偏离 CF_4吸收峰较远的泵浦线采用高气压连续调谐 CO_2激光器为泵浦源的优越性。     

发射7W可调谐蓝光的光泵激光器

新罕布什尔州激光光学研究公司最近从用于声光调制器投射系统的光泵激光器中发射７Ｗ蓝光的功率,这比公司去年创造的５Ｗ功率提高了４０％。这个系统在４３０～４６０ｎｍ波长范围内产生７Ｗ以上可调谐蓝光输出,脉冲时间８０ｎｓ,重复频率为１７ｋＨｚ,光束质量为Ｍ２＝２．２。该系统以掺钛蓝宝石激光输出的内腔倍频为基础,蓝宝石激光器本身的激光棒,用Ｑ开关Ｎｄ∶ＹＡＧ激光器的４８Ｗ以上绿光倍频输出作纵向抽运。用作内腔倍频的晶体是β硼酸钡（ＢＢＯ）,激光输出光束的短期功率稳定性为１％。据研究人员说,ＢＢＯ蓝光激光器的…     

残剩泵光全反馈的钛宝石可调谐激光器

本文引用增益调制的概念指出空间周期性增益的钛宝石可调谐激光器。将钛宝石晶体的后端面取屋脊陵镜形式,所成腔型是四镜折迭驻波腔的一半,泵束Ar~+激光全反射返回形成周期性的增益调制。这种腔可更有效利用泵束能量;钛宝石晶体也可以较短,对于质量不佳的钛宝石晶体可降低阈     

光网络推动可调谐激光器发展

用于光网络的可调谐激光器的潜在市场很大，如果预测正确的话，将从2000年的几百万美元扩大到2004年的10亿美元。这一趋势使得几种可调谐激光器的技术之间展开激烈的竞争，而且已经研制出几种实用器件。虽然不断有新的可调谐激光器冲击市场，但密集波分复用（DWDM）技术的迅猛发展总是能够找到新的用途并维持技术革新的压力。密集波分复用系统的每个通道都需要一个主激光二极管和一个备份源。目前的WDM系统荷载为每条光纤32或64个通道，而且由于通道间距将不可避免地从现在的ITU标准规定的100GHz将来降到50~25 GHz，单根光纤最终会发…     

可调谐激光器

从激光出现以来,就已认识到像无线电那样波长可任意改变的激光器将是极其有用的,它可用于高分辨率光谱学、光化学、医学、生物学、集成光学、污染监测、半导体材料的加工处理、信息变换及通讯等。多年来已研制成了各种各样的可调谐激光器,激光输出波长已扩展到真空紫外和远红外区。但是,在这一领域内还未出现真正的突破,可以工作在任意波长的可调谐激光器目前还未研制成功。大多数实验室使用的主要是染料激光器,使用者很少有他们得心应手的可调谐激光器,许多工作都     

光网络中的可调谐激光器的研究

随着光网络的不断发展，可调谐激光器显现出越来越重要的作用。本文主要介绍了各种不同类型的可调谐激光器，主要包括可调谐半导体激光器和可调谐光纤激光器，并对可调谐激光器的发展做了简单的介绍。     

光网络推动可调谐激光器的发展

光网络用的可调谐激光器将拥有巨大的市场潜力。据报道其市场将从2000年的数百万美元增加到2004年的十亿美元。这种超势已日趋明朗,并引起各种可调谐半导体激光器技     

基于半导体光放大器的可调谐激光器

采用半导体光放大器设计实现了可调谐频域锁模激光器,可得到调谐范围宽、稳定性高的激光输出,基于半导体光放大器的可调谐激光器可用于光纤光栅传感系统,提高系统信噪比和解调精度,增强复用能力,改善系统性能.     

光网络中可调谐激光器的前景

可调谐激光器是一种令人兴奋的技术,多年来它一直是光网络产业的宠儿。这种波长可调的器件拥有极大的潜力,足以解决目前系统设计商们面临的众多问题,并能极大提升光网络效率。 对系统制造商而言,可调谐激光器可以简化生产后勤以及仓储管理,同时还能使各种创新和灵活的设计成为可     

A parametric study of the output of the optically pumped continuouswave CF4 laser

A parametric study of laser output versus CF₄ pressure and temperature was performed and correlated with a model for the gain in the system, which includes the relevant relaxation processes. Lasing in CF₄ was observed at temperatures below 170 K. Cooling the CF₄ gas, the output power of the laser increased from 3 mW at 142 K to 5 mW at 113 K, when 4% of the radiation was coupled out. Chopping the pump, the 16-μm signal consisted of a peak decaying in approximately 2 ms, superimposed on a CW background. This decay is caused by the slow relaxation in the CF₄ laser, resulting in filling of the lower laser level. For the CW CF₄ laser, vibrational relaxation from the laser lower level is even slower than diffusion to the cold cell walls. To increase the relaxation rate, HD was added. In this molecule, the J=1→3 rotational transition at 447 cm^-1 is almost resonant with the ν₂ vibration in CF₄. Maximum CW output was increased by 25% in a mixture containing 10% HD. At the same time, the lasing pressure range was extended     

Optically pumped NH3 as a high-gain amplifier forCO2 laser radiation

Optically pumped high-pressure mixtures of NH₃ in N₂ are shown to be efficient broadband amplifiers of pulsed CO₂ radiation. In a dilute NH₃ mixture at 6 atm a single-pass gain of 150 (21.8 dB) was measured for the 10P(34) CO₂ transition. Gain was observed in NH₃ at pressures as high as 10 atm. Experimental measurements were made for a range of wavelengths in the 10.7 μm region, and the results compared with calculations based on a rate-equation model     

12μm带光泵NH_3调频激光器

光泵NH3激光器已在6~300范围获得近百条谱线的激光输出。且具有较高的能量转换效率，在部分分波段的转换效率已达到20-30%左右，显然，调频NH3     

Optically pumped caesium-freon laser

A Cs vapour laser using Freon-14 as the buffer gas has been demonstrated. All operating parameters of this laser (threshold, output power, slope efficiency) are similar to a Cs laser operating with an ethane buffer gas. No contamination of the gain medium was observed at operating temperatures below 100 degC, while at higher temperatures such contamination appears and leads to lasing degradation.     

Optically pumped continuously tunable high-pressure molecular lasers

Recent developments in the optical pumping of high-pressure molecular lasers, particularly continuously tunable high- pressure molecular lasers, are described. Included are some experimental results on optically pumped pure CO2lasers, optically pumped ultrahigh-pressure CO2-He lasers, and optically pumped N2O/CO2transfer lasers. Recent efforts to use the output from these devices for high-resolution infrared spectroscopy are also described.     

光泵CF4 16微米激光器

本文介绍了由 TEA CO_2激光器的9R(12)跃迁线泵浦冷却的 CF_4分子,获得 16μm激光输出。泵浦光用限孔光阑得到TEMoo单横模,由低气压CO_2增益池压缩线宽,并与光泵腔良好的模式匹配下,以700mJ的泵浦源能量获得25mJ左右的16μm激光输出能量。光量子转换效率达7％左右。激光脉宽窄于150ns,该器件可在约0.5Hz重复率下,以20mJ的输出能量运转数千次。     

1.35 GHz线性调频Nd:YVO4激光器

报道了808 nm连续半导体泵浦全固态Nd:YVO4线性调频激光器实验研究。利用优化谐振腔长度、腔内插入倾斜标准具,采用温度控制、机械减震和隔绝外部环境等稳频操作,实现了稳定的1 064 nm单频激光输出,最大输出功率140 mW。利用法柏干涉仪观察单频输出,并利用刀口法测量得到的基模高斯光束质量M2为1.05。在谐振腔内插入RTP电光晶体并连接外部高压电源,通过线性电光效应改变谐振腔长度以及改变标准具倾斜角度避免腔长调节过程中的模式跳频,实现了1.35 GHz的稳定线性调频激光输出。编程控制高压电源给RTP晶体施加幅值为2 200 V的锯齿波形电压,实现了频率20 Hz,平均输出功率为85 mW周期性的调频信号输出。     

New SMMW laser transitions optically pumped by a tunable CO2waveguide laser

Optical pumping of a submillimeter wave (SMMW) laser with a relatively compact RF-excited CW CO2laser is described. The increased frequency tunability of the waveguide pump laser has resulted in new low threshold SMMW emissions in C2H2F2, CDF3, and CD2F2by pumping into absorption lines which are beyond the tuning range of a conventional CO2laser. Frequency offsets and some assignments obtained with the aid of a tunable diode laser heterodyne spectrometer are reported.     

Oxide-confined vertical-cavity surface-emitting laser pumped Nd:YVO4 microchip lasers

In this letter, we demonstrate an experimental study of using a large area oxide-confined vertical-cavity surface-emitting laser (VCSEL) to pump a Nd:YVO₄ microchip laser. The maximum output power of 1.2 mW in TEM₀₀ mode is obtained with a pump power of 8.2 mW. Experimental results show that the complex transverse modal behavior of VCSELs in the higher injection current may cause an impediment of power scaling