Laser effects

Barasch A, Peterson D, Tanzer J, D Ambrosio J, Nuki K, Schubert M, Franquin J, Clive J, Tutschka P (1995) Helium-neon laser effects on conditioning-induced oral mucositis in bone marrow transplantation patients. Cancer 76(12) 2550-2556... 

COUNTERING PARTIALLY COHERENT LASER EFFECTS IN PUMP-DUMP CONTROL... 

Excitation conditions At about 10cm"1 and farther above the 0-0 transition, the excitation wavelength does not seem to influence the fluorescence spectrum. This observation points to a rapid thermalization of the exciton population.87 In contrast, the excitation power has an important nonlinear effect Above a threshold stimulated emission is observed on the 0-1400 line, at 23692 cm"1.88 The crystal behaves as an optical resonator, with laser effects, which explains the sharpness and the intensity of this line in Fig. 2.17.89... 

Karu TI. Photobiology of low-power laser effects. Health Phys 1989 56 691-704. 

Karu TI. Local pulsed heating of absorbing chromophores as a possible primary mechanism of low-power laser effects. In Galetti G, Bolognani L, Ussia G (eds), Laser Applications in Medicine and Surgery. Bologna Monduzzi Editore, 1992. 

P. D. Zavitsanos, J. A. Golden, and W. G. Browne, Study of Laser Effects on HeatshieldMaterials (final report), General Electric Co., Philadelphia, Pa.,... 

Since we had proposed a similar experiment with irradiation in the ultraviolet-visible absorption band of the uranyl ion (15), we tried to reproduce these results, but without success (16). Collisions in the liquid phase occur so rapidly (about 10l2 s x) that vibrational excitation of the uranyl ions would be dissipated long before any significant fraction of excited uranyl ions could reach the interface and therefore change the distribution between the two phases. Rapid loss of vibrational excitation in relation to other processes is a generic problem for infrared laser effects in any system of condensed phases. However, differences between experimental setups may account for the differences in results,... 

An important consideration in analysing transients is to establish whether large temperature rises are produced following pulsed laser excitation. The subject of thermal laser effects has been discussed fully by Imhof et al [18], who developed the following equation to quantify the temperature rise AT(o) occurring at the surface of the sample. 

The change in symmetry or -reversal effect is accounted for in section 8.28 we note here that it occurs in a Rydberg series of autoionising lines when a broad intruder is present, but that it also occurs when a relatively sharp autoionising line is tuned through a broad resonance. Early theories of strong field laser effects [411] provided this picture, used by Connerade to discuss q reversals [382] when they were first observed,... 

C.E. Carroll, F.T. Hioe, Excitation using two lasers Effects of continuum-continuum transitions, Phys. Lett. A199 (1995) 145. 

Kaminskii AA, Rhee H, Eichler HJ, Ueda K, Takaichi K, Shirakawa A et al (2008) New nonlinear-laser effects in crystalline fine-grained ceramics based on cubic SC2O3 and LU2O3 oxides second and third harmonic generation, and cascaded self-sum-frequency mixing in UV spectral region. Laser Phys Lett 5 109-113... 

Duley, W. W. (1976). CO2 Lasers Effects and Applications. Academic Press, New York. 

Amplification of spontaneous emission by stimulated emission and the laser effect... 

Within a few years these very first results were followed by laser effects in other R ions such as Pr +, Ho +, Er +, Tm +, Yb +, Dy +. In particular Er laser emission at 1.5 pm was obtained in silica glass (Snitzer and Woodcock 1965), and studied in phosphate, beryllium fluoride, fluorophosphate glasses (Auzel 1966a, 1968). All these pioneer results have already been reviewed in several books (for instance, Di Bartolo 1968, Roess 1969, Weber 1979 in volume 4 of this Handbook Kaminskii 1981, Reisfeld and Jorgensen 1977). 

Because the laser effect is a special case of ASE where feedback occurs, the necessary conditions on 72 are the same as for ASE and are only given by eq. (108). This stringent condition is so weak that it is always fulfilled, and books about lasers do not even need to mention the existence of (Roess 1969, Weber 1979, Kaminskii 1981). It is so much the case that at room temperature, T2 is reduced to a few tens of picoseconds by phonon interaction. On the other hand, because of the multifold nature of the laser cavity, Tg is now the photon lifetime in the cavity, which is much larger than the travelling time in a distributed amplifier. It is given now by... 

The condition for the laser effect is simply given by the threshold condition corresponding to the balance between gains and losses... 

Although the involvement of a phonon side band in the laser effect is usually connected with the transition-metal tunable laser (Kaminskii 1981) because of the stronger S value... 

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