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The stabilization of diode lasers with a wider spectral line based on the iodine absorption cell, has been examined with a stabilization method of a 3rd, 5th and 7th harmonic deviation. Possible stability levels, according to the width of diode laser's spectral line have been checked. The 3rd, 5th and 7th harmonic deviation stability method have been compared.
In this paper, interference aspects of terahertz transmission are considered. Possible interference effects in indoor THz communication are experimentally proved using a THz photomixer setup. The method of coherent homodyne detection is applied to explain the problem. Fourier Transform is used for precise analysis of the interference effects and calculations of the optical path changes. The paper...
The presented in the paper optical method of measuring vibrations and oscillation has many benefits. They are: high measuring speed and high sensitivity of the method. Another benefit is the possibility of the non-contact measurement, when both laser and the gauge are both not mounted to the oscillating element. Changing the configuration of the optical system enables an increase in the resolution...
In the paper the pumping efficiency of active, different types double-clad fiber has been analyzed. The ray tracing method has been applied for fibers analysis. The most often utilized fibers: circular non-concentric, D-shape, fin-shape, rectangular fibers have been analyzed. The results show that the geometry of the inner clad fibers is not very significant for pumping efficiency, except the case...
In this paper, a numerical analysis of algorithm of optical fiber systems with dimensions much larger than light wavelength has been presented. This algorithm can be used especially in the case of multimode fiber-optic elements. The presented technique of the analysis is based on the ray tracing method (RTM). Up to now, the RTM was widely used for an analysis of lens-systems. In this paper, a new...
Construction of a simple single-frequency diode laser 632.8 nm, used as a frequency standard in the laser interferometers is demonstrated. Two different systems applied for frequency stabilization of diode laser were used . For diode laser used as the secondary standard, the system stabilizes diode temperature, the frequency stability of the laser reaches value 1 part in 106. For diode laser used...
The possibility of stabilization of diode lasers, lasers with a wider spectral line based on the iodine absorption cell, has been examined with a stabilization method of a 3 harmonic deviation. Possible stability levels, according to the width of diode laser's spectral line, have been checked. It has also been checked the change of the signal of the 3 harmonic in dependence with the frequency and...
In the paper the ray tracing method for analysis of Double-Clad (DC) fibers has been applied. The algorithm permits to determine attenuation, power density and absorption along a fiber. The most popular symmetrical, asymmetrical and D-shape fibers have been analyzed. The results show that the differences in pumping efficiency for the analyzed fibers are not significant.
In the numerical analysis algorithm and practical results of a new way of pumping double-clad fiber amplifiers and lasers has been presented. The presented technique of analysis is based on ray tracing method (RTM) which allows to analyze light propagation through a asymmetrical fiber couplers for optimizing the side pumping
Przedstawiono wstępne wyniki stosowania fotostymulacji laserowej w zabiegach angioplastyki wieńcowej (PTCA). Oceniano bezpieczeństwo metody w aspekcie danych klinicznych chorych poddanych wewnątrznaczyniowej fotostymulacji w porównaniu z grupą kontrolną. Stwierdzono brak objawów ubocznych oraz niepożądanych omawianej metody. W badaniach krótkookresowych skuteczność zabiegów angioplastycznych w połączeniu...
Przedstawiono założenia konstrukcyjne nowego dyfuzora emitującego promieniowanie laserowe prostopadle do osi długiej światłowodu. Omówiono jego zastosowanie w diagnostyce i terapii medycznej.
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