KEYWORDS: Chemical species, Semiconductor lasers, Cesium, Alkali vapor lasers, Continuous wave operation, Laser processing, Gas lasers, Laser applications, High power lasers, Laser systems engineering
Diode-pumped alkali vapor laser (DPAL) is a new class of laser, and it is expected to realize high efficiency and
high-average-power laser with good beam quality (near-diffraction-limited). DPAL offers CW laser radiation at
near-infrared wavelengths and can find a lot of applications in power beaming, drilling oil and gas well and laser
material processing.
Operating temperature affects not only the density of alkali vapor atom in active region, but collision broadening and
fine-structure mixing rate. In this paper, we study the operating temperature characteristics of DPAL. Based on the theory
of quasi-three level CW laser, the dependence of cesium laser output power on the operating temperature has been
simulated. The results showed that there exists an optimal operating temperature around 95 to 110 centigrade for high
pumping power. In lower temperature region, the laser power rise linearly with increasing operating temperature, namely
increasing active density. However, the laser power falls after the optimal operating temperature, because the
spontaneous radiations deplete large numbers of stimulated population contributing to laser emissions. At the optimal
temperature, an optical- optical efficiency of about 73% is able to reach theoretically.
The copper ion laser generates CW UV (248 - 272 nm) and near IR (780 nm) laser radiation. This laser is usually excited by hollow cathode discharge. In recent years, a new discharge, so-called capacitively coupled radio frequency (CCRF) discharge has been employed to pump the metal ion laser, in order to increase laser efficiency and improve its discharge stability and the lifetime of the laser. In this paper, the principle and nature of the CCRF discharge, and its application for the copper ion laser are reviewed.
Based on the mathematical analysis for optics of the laser scanning system, the mechanisms of the graphic distortion in the laser display has been studied. After considering the beam trace from image plan to galvanometer, a relation between the image points on the screen and the scan angles was built. Thus, it has been able to rectify the scanning linear distortion and pincushion error by computer software effectively.
The copper ion laser supplies interesting CW UV emission in the region 248 - 270 nm. It is possible to realize VUV (-160 nm) laser oscillation in the copper ion laser. Its discharge characteristics, laser gain and output performance in dependence on the operating conditions have been investigated. A UV laser gain of 4.72%/m and a quasi-CW power of 700 mW without the optimum of the output coupling have been measured. The processes in laser plasma can be described and the experimental results were good explained with a theoretical model presented by the author.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.