New UV and visible laser oscillations in chlorine, oxygen, nitrogen, and titanium

Eight new UV laser lines and 12 new visible laser lines of chlorine, oxygen, nitrogen, and titanium have been obtained by connecting or not connecting inductance coils with the discharge circuit to control the peak discharge current so as to stimulate the laser actions of the lower multiple ion or the higher multiple ion. As the laser duration is much longer than the discharge duration, the lasers are excited in the afterglow, that is, these are recombination lasers in the UV and the visible regions.     

New pulsed laser transitions in TeII

Laser action during the active discharge at λ's 5454 and 5641, and during the late afterglow at λ's 5936, 6246, and 7039 in a high current pulsed discharge containing tellurium vapor and neon is reported. The afterglow transitions belong to the spectrum of TeII, but the assignment of the active discharge lines is uncertain.     

New infrared laser transitions in Ag II

We have observed seven infrared laser transitions when exciting a He discharge in a silver hollow cathode. To our knowledge, five of the seven laser transitions have not been reported previously in the literature.     

氯紫外和可见新激光跃迁

用电感控制放电回路脉冲电源峰值的方法,分别在加电感和不加电感的情况下,获得氯新激光谱线十三条:306.3毫微米,307.7毫微米,365.7毫微米,367.0毫微米,394.3毫微米,441.5毫微米,459.6毫微米,460.8毫微米,477.1毫微米,477.9毫微米,509.9毫微米,517.6毫微米和535.6毫微米。其中394.3毫微米为最强的跃迁,激光强度比已知氯激光谱线392.0毫微米还强,激光脉宽远大于放电脉冲的宽度,因此,它们是复合激光,在脉冲余辉产生激光振荡。另外还发现已知氯激光263.3毫微米具有很高的增益,达海米30％。     

New visible laser transitions in Ba I and Ba II

Three new visible laser transitions atlambda = 7120Å in Ba I and atlambda = 6496.9and 6141.7 Å in Ba II have been observed in a pulsed discharge with Xe, Ne, and He as carrier gas. A new all-metal hollow-cathode design was used.     

New CW laser transitions in singly ionized cadmium and zinc

New CW laser lines from CdII at 8067 and 8530 Å and from ZnII at 4912 Å have been observed in a transverse-discharge configuration. The most probable excitation mechanism is by charge-transfer collisions with He buffer gas.     

New laser oscillation in the oxygen atom

A new laser oscillation has been observed in a pulsed discharge of He and O2. This oscillation at 2.652 μm has been identified as belonging to the O(I) atom.     

New room temperature CW laser transitions in YAlG:Nd

Using a dispersive prism, the room temperature YAlG : Nd laser has been made to oscillate CW on a total of seven⁴F_{3/2} rightarrow⁴I_{11/2}transitions ranging in wavelength from 1.0519 μm to 1.1226 μm and a single⁴F_{3/2} rightarrow⁴I_{13/2}transition at 1.319 μm.     

New UV and IR transitions in gold, copper, and cadmium hollow cathode lasers

We have observed four additional ion laser transitions in gold, copper, and cadmium hollow cathode discharges. The new lines are at 2264 Å (Au II), 2722 Å (Cu II), 8599 Å (Au II), and 8652 Å (Cd II).     

New lines in the UV: SRS of excimer laser wavelengths

The UV excimer lasers ArF, KrCl, KrF, and XeCl were utilized to create new families of UV lines by multiple orders of broad-band nonresonant stimulated Raman scattering (SRS) in the media H2, D2, CH4, and LN2. Mixed-media and excited-state SRS were also studied.     

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.     

紫外可调频准分子激光系统

报道一种结构简单的紫外可调频放电泵浦准分子激光系统,只用一个火花隙控制两台准分子激光器实现了振荡放大。在XeCl(中心波长308毫微米)谱区实现了调频输出,单脉冲能量11毫焦耳,带宽0.07毫微米,束散角约为0.2毫弧度。     

用等离子体电极产生紫外激光发射

我们研制了一种新颖的放电泵浦形式,即采用金属片间的放电产生等离子体即作为预电离又作为主放电电极。在N_2气中获得了均匀放电。 装置结构和电原理图如图1所示。金属片均采用1mm厚的钼片,制成锯齿形,每片长约1cm。两金属片放电间距为5mm。装配时,根据需要金属片数量可多可少,纵向金属片间距可密可疏。贮能电容C_0为64.8nF(2700pF×24)陶瓷电容器。每对金属片配一个电容量为780pF的小陶瓷电容器C_1。主放电电极间距为2cm。当球隙导通时,主贮能电容C_0放电,上电极和金属片间产生电压差,由于每对金属片配有一个电容器C_1,因此,在主放电回路导通之前,金属片之间首先放电对C_1充电。金属片的放电为主放电提供了良好的预电离条件,此时     

紫外飞秒激光的脉宽测量方法

相对于近红外波段的飞秒激光脉冲，紫外波段的飞秒脉冲由于具有单光子能量高、聚焦特性好、电离率高和成丝阈值低等优点，在高功率密度光场的产生、等离子体光物理等领域有着越来越广阔的应用前景，成为激光技术的研究热点。随着紫外飞秒激光技术的发展，传统的脉宽测量方法不能满足需求。指出了紫外飞秒激光脉宽测量研究的主要进展，讨论了目前可用于紫外飞秒激光脉宽的测量方法，主要有双光子荧光测量法、互相关法、简并四波混频法、多光子电离法，介绍了相关测量原理与特点。在此基础上，对紫外飞秒激光脉宽测量技术研究前景进行了展望。     

紫外激光冷却镁原子

利用反向激光与原子跃迁产生共振,可使Na和Cs原子减速。与Na和Cs原子相比,Mg原子结构对于冷却更为方便。Mg原子的部分能级示于图1。从图中可以看出,区别于Na或Cs原子的是Mg原子的基态没有精细结构,因此也就避免了光泵效应。当然有一定输出功率的与Mg原子的~1S_0—~1P_1产生共振跃迁的285.2nm的激光是必要的。