Longitudinal mode spectral line of pulsed laser is an important parameter of pulsed laser performance. It has important
influence on laser theoretical analysis, test and application. Proper method should be used to measure and analyze.
Lorentzian function in pulsed laser waveform is introduced in detail. Lorentzian function curve fitting of longitudinal
mode based on LabVIEW is implemented. An applicable method of eliminating noise for measuring and researching
pulsed laser is provided.
Due to excellent photoelectrical properties, ITO thin films become the indispensable flat transparent electrode for their practical applications in the flat-panel displays, touch screens, solar cells and electrochromic devices. Therefore, it's very necessary to study photoelectrical properties of ITO films. In this paper, ITO thin films were prepared on the glass substrates by DC magnetron sputtering technology, and measured the transmittance of ITO thin films in the visible region using the spectrophotometer; the resistivities were measured with the four-probe instrument. The effects of sputtering pressure, oxygen-argon flow ratio and sputtering power was researched on photoelectrical performance of ITO thin films. The results show that, the optimum parameters
of ITO films prepared are: sputtering pressure 0.6Pa, oxygen-argon flow ratio 1:40, sputtering power 108W. The average transmittance in the visible area is 81.18%, resistivity is 8.9197 × 10<sup>-3</sup>Ω.cm.
A theoretical model for the backscattering from thin film deposited on super-smooth optical surface is established, based on which, a solid-angle integrated scattering (SIS) characterization system is built. The SIS measurement collects backscattered light in a limited solid angle by using an integrating sphere. The characterization system consists of three major parts: mechanical system, photoelectric conversion system, and control software. The scattered flux is spatially integrated by the integrating sphere and is detected by a photomultiplier and lock-in amplifier. The lock-in detection offers excellent noise rejection and is the key to the sensitivity. The measurement can be performed completely under the control software based on the Labview. Experiment results of the measurement are presented, sources of error are analyzed. Results showed that the backscattering down to 10ppm could be characterized with a resolution of 1ppm. The system can be used to measure the backscattering for an incident angle between 25<sup>o</sup> and 50<sup>o</sup>.
In the paper, appearance and composition of an optical interference multi-layer coatings derived by sol-gel process were introduced. In particular, it is given that the distribution function of micro particles diameter size and the variety situation of porousness and graininess, as well as the influence of heat-treated temperature on optical quality of coatings. A lot of measurement result is supported by ESCA, AES, SEM and AFM and so on.
In this paper, Xe and He-Ne atomic lasers and CO<SUB>2</SUB> molecular lasers excited by 30 MHz approximately 2 GHz frequency have been studied, and then put forward the key of getting high efficiency is how to control the electron energy of discharge space. In the mobility-dominated discharge space of Xe laser, the product of gas pressure and input power is constant. In He-Ne laser, the product of gas pressure and power supply frequency is a constant in plasma discharge space of the glass tube under the optimum laser output. As to the slab waveguide CO<SUB>2</SUB> laser, the center of discharge space is quasi-Faraday dark region. But to the high power CO<SUB>2</SUB> laser (flow gas) the discharge space is plasma. Since there demand much lower electron energy, and high density for CO<SUB>2</SUB> laser, only in discharge structure there are several designing schemes can be referenced.