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Spectrum broadening by self-phase modulation (SPM) may be used for increasing PW-class laser pulse power. The influence of high-order spectral phase on SPM and compression of intensity pulses will be discussed. The results of compression of sub-PW pulses of the PEARL laser will be presented.
A theoretical model for predicting of the pulsed photolysis oxygen-iodine laser (POIL) performance has been developed. The calculated output energies of the POIL are in good agreement with experimental ones. Pathways in which the energy of O(1D) is converted to excitation energy of singlet oxygen molecule are discussed.
High optical harmonics generation process in atomic gases interacting with bichromatic laser field in non-collinear scheme is studied with the aim of polarization state of atomic response investigation in dependence on incident field spatial properties. It is shown that the non-dipole transitions (the impact of which increases with laser field intensity) play the crucial role in discussed process.
New interpretation of the high order harmonic generation in atomic gases interacting with laser fields is presented. The mechanism is in the temporal evolution of atomic electron density spatial distribution in the external laser field.
We present the results of theoretical study on the effective generation of both terahertz radiation and high-order harmonics in the process of a single atom interaction with a multicolor laser field. Numerical results are discussed.
Invar alloy has lower thermal expansion and is widely used. However, its intensity is too low to meet the requirement of industry. In order to improve its high-temperature strength, WC-Co cemented carbide was welded to invar alloy using high energy Laser-TIG (Tungsten Inert Gas) hybrid welding. WC migration phenomenon was discovered in welding process and its corresponding mechanism was discussed...
Wavelength and directional hysteresis due to increasing and decreasing current and temperature have been investigated. Measurements indicate that lasing direction hysteresis associated with changes in injection current can be attributed to the resulting shift in the linear gain peak which is due to the change in device temperature. Interaction between the linear gain spectrum and the asymmetric nonlinear...
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