Correction to "Operating conditions of the slotted hollow cathode UV Cu+laser"

The performance of the UV Cu+ laser in a slotted hollow cathode has been investigated experimentally. The laser power dependent on discharge current, neon pressure, cathode length, and laser mirror transmission has been measured. The optimum neon pressure was found to be 13 mbar. Single-pass gains about 8 percent . m^-1have been evaluated. The observed changes in the slot shape by sputtering during 100 h of operation are briefly discussed. The experimental results are compared to a recent sputtering theory and reasonable agreement is found. The sputtering theory, the spontaneous intensity measurements, and the evaluated gains are used to calculate the number densities of the5sCu+ levels. Laser power is calculated from single-pass gains and agreement with experimental results is obtained.     

紫外铜离子激光器的理论研究

系统研究了连续工作的紫外铜离子激光器理论,即空心阴极放电的阴极位降理论,阴极溅射,放电等离子体中粒子的扩散和粒子数密度的速率方程。计算结果由实验得到验证。     

UV lasing on Cu+ in a Ne-CuBr pulsed longitudinaldischarge

UV lasing on copper ion transitions in CuBr vapor laser has been obtained in a nanosecond pulsed longitudinal discharge with Brewster windows and external mirrors. A record small-signal gain per unit length has been achieved (up to 19%/m and 16%/m for the 238.6- and 270.3-nm transitions, respectively). Infrared (IR) laser action on Cu ions in a He-CuBr discharge and on Ag ions in a He-AgI (silver iodide) discharge has also been observed. A maximum average output power of 430 mW has been achieved multiline (740.4-780.8 nm) on the Cu+ IR transitions. A maximal gain of 58%/m has been obtained on the strongest 780.8-nm transition     

Optimization of a UV Cu+ laser excited bypulse-longitudinal Ne-CuBr discharge

The discharge conditions for high average output power on four UV Cu⁺ lines at 248.6 252.9, 260.0, and 270.3 nm, in a nanosecond pulse-longitudinal Ne-CuBr discharge, have been investigated in two discharge tubes of different designs. A record average output power of 210 mW (and a peak pulse power of 1.7 W) on the 238.6-nm laser line, and of 270 mW for multiline operation has been obtained. An optical effect enhancing the 248.6-nm laser line power has been observed as the intensity of two Cu atom laser lines (510.6 and 578.2 nm) increases. It has been shown that the presence of Br atoms in the discharge leads to a fall of the Ne metastable density via Penning ionization and, hence, to a decrease of the Cu⁺ metastable density and an increase of the laser output     

Widening of spectral lines in an Ar+laser

In this paper an investigation of the spectral line widths and shifts of Ar I and Ar II lines in argon ion laser plasma is carried out. The discharge-tube internal diameters were 5 and 7 mm, the current densities were 113, 163, and 242 A/cm², and the pressures were 0.68, 0.42, and 0.23 torr. Approximate calculations were made of ion and electron temperatures, electron density, ion mean free path, and charge-exchange cross section. It was determined that ion-neutral charge-exchange collisions play an important role in this type of plasma.     

Pump-power-dependent efficiency in a YAG: Nd3+laser

The efficiency of a YAG: Nd³⁺-laser and the influence of pump-power level and of spectral filtering the pump light was studied. The laser was pulsed high above threshold. Without filtering the pump light, the maximum laser emission was reached 30 μs before the maximum pump power. With filtered pump light, the efficiency is doubled and the laser emission roughly follows the pump power. Dynamic input-output characteristics show an efficiency minimum at the pump-power maximum.     

空心阴极He-Cd~ 白光激光器内光电流效应的实验研究

对笛型空心阴极He-Cd~ 白光激光器三色光的内光电流效应进行实验研究.对机理进行了初步探讨.实验研究表明,内光电流效应可用于测量多阳极结构的空心阴极放电管中金属蒸气浓度的均匀性和稳定性.     

Ho3+laser action in YAlO3at 2.119 µ

Pulsed laser action at 2.119 μ has been observed from Ho³⁺in a crystal of YAlO3sensitized with Er³⁺and Tm³⁺. A linearly polarized output of 1.2 J was obtained at 77°K. Measurements of the anisotropy of the stimulated-emission cross sections are reported.     

Flashlamp-pumped YAG:Nd+3laser action at kilohertz rates

Laser action at high repetition rates with flashlamp pumping has been achieved in a YAG:Nd³⁺laser rod. With the resonant charging techniques used in the experiments, the repetition rate is limited by the heating of the laser rod.     

An investigation of the effect of an axial magnetic field on the He-Cd+laser

The drastic effect that a weak axial magnetic field can have upon the output of an He-Cd+ metal vapor laser is reported. A 37-percent increase in output power has been observed for a tube current of 55 mA and magnetic field strength of 70 G. Also described are parametric and spectroscopic studies performed to elucidate the cause of the large power output change.     

Electron temperature and density in the He-CdI2positive column used for and I+laser

Plasma parameters in the He-CdI2positive column used for an I+ laser were measured using a probe. The presence of iodine seems to partially cancel the influence on the electron temperature of the Penning process which is very dominant in the He-Cd positive column.     

Parasitic noise on the output of a CW YAG:Nd+3laser

An experimental investigation was conducted to reduce the parasitic noise appearing on the output of a 6-W CW YAG:Nd⁺³laser. Initially, low-frequency fluctuations as high as 30 percent and relaxation oscillation bursts exceeding 80 percent of the CW power level were present. Low-frequency modulation was reduced by the addition of an active feedback loop to control lamp current. Relaxation oscillations were determined to be influenced by laser rod cooling, pump-lamp aging, vibration, and intracavity optical interface quality. At the conclusion of the program, low-power fluctuations and relaxation oscillation excursions did not exceed 2 percent.     

高压螺旋形空心阴极UVCu+激光器

本文研究了高压螺旋形空心阴极紫外(UV)铜离子激光器的工作特性,测定不同螺旋结构激光器的紫外输出功率。在放电长度1.2m,内径6mm,螺距9mm的分段放电管中,在波长260nm时获得最大峰值功率660mW。     

Periodic multiplate resonant reflector for a YAG: Nd3+laser at 1.318 µ

A periodic resonant reflector with thin air intervals is designed for a YAG:Nd³⁺laser in order to achieve emission of a line at 1.318 μ by suppressing the well-known line at 1.064 μ for reasons of laser safety.     

Use of I2filters for stabilizing Ar+laser frequency and for attenuating parasitic scattering at the unshifted frequency in a molecular scattering spectrum

The two-iodine-cell technique for obtaining spectra of molecular light scattering with strongly attenuated parasitic scattering is described. One cell is used to attenuate parasitic scattering light, the other to stabilize the laser frequency on the iodine absorption line.     

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).