Entity

Time filter

Source Type

Saint Petersburg, Russia

Koval'chuk L.V.,ZAO Laser Physics | Goryachkin D.A.,ZAO Laser Physics | Sergeev V.V.,ZAO Laser Physics | Kalintseva N.A.,ZAO Laser Physics | And 3 more authors.
Journal of Optical Technology (A Translation of Opticheskii Zhurnal) | Year: 2012

The creation of a high-intensity source in the 4.6-5.4-μm range is a problem that has attracted the attention of researchers for several decades. This paper describes the optimization of the process of generating the second harmonic of the radiation of a pulse-periodic TEA CO2 laser by choosing a nonlinear crystal and the temporal shape of the laser-pump pulse. Energy-conversion efficiency of up to 20% has been experimentally obtained in a ZnGeP2 crystal with mean power of the radiation in the λ = 4.8 um region of up to 0.24 W and a pulse repetition rate of 10 Hz. © 2012 Optical Society of America. Source


Kholodova S.I.,ZAO Laser Physics | Goryachkin D.A.,ZAO Laser Physics | Koval'chuk L.V.,ZAO Laser Physics
Journal of Optical Technology (A Translation of Opticheskii Zhurnal) | Year: 2010

A number of comparative experiments have been done for the first time on the surface cleaning of the same samples of works of art made from stone with the radiation of two types of lasers: Nd:YAG and TEA CO2. The results showed that, when marble and plaster are irradiated at a wavelength of 10.6 μm, unlike 1.06 μm, the surface-yellowing effect that accompanies cleaning is absent. Visual monitoring, appraisal by restorers, and measurement of the optical transmission of the marble in the cleaned regions confirmed that, despite the strong absorption of marble in the 10.6 μ m region, cleaning is not accompanied by surface damage of the sample when the parameters of the CO2 laser are chosen correctly. As part of this project, an attempt was made to remove specific contaminants (such as cement, resin, and rust) from a marble surface, the cleaning of which causes a number of difficulties among restorers when traditional methods are used. © 2010 Optical Society of America. Source


Kholodova S.I.,ZAO Laser Physics | Goryachkin D.A.,ZAO Laser Physics | Koval'chuk L.V.,ZAO Laser Physics | Smirnov S.A.,ZAO Laser Physics
Journal of Optical Technology (A Translation of Opticheskii Zhurnal) | Year: 2010

The restoration community has shown great interest in recent years in the laser cleaning of objects of history and culture. This paper presents a study of using the radiation of Nd:YAG and CO2 lasers to clean articles made from steel and silver. It is shown that laser cleaning makes it possible to solve a number of problems that are virtually insoluble by traditional methods in restoration. It is also established that the Nd:YAG laser in most cases is a more effective tool than the TEA CO2 laser for the laser cleaning of metallic objects of art. © 2010 Optical Society of America. Source

Discover hidden collaborations