Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

INVESTIGATION OF CONTRAST RATIO DEPENDENCE ON THE ANGULAR DEVIATION OF THE LASER BEAM DIRECTION FROM THE OPTICAL AXIS OF POCKELS CELLS BASED ON THE BETA BARIUM BORATE CRYSTAL
Giedrius Sinkevičius^a,b and Algirdas Baškys^a,b
^aDepartment of Material Science and Electrical Engineering, Center for Physical Sciences and Technology, Saulėtekio 3,
10257 Vilnius, Lithuania
^bFaculty of Electronics, Vilnius Gediminas Technical University, Naugarduko 41, 03227 Vilnius, Lithuania
E-mail: giedrius.sinkevicius@ftmc.lt

Received 31 January 2019; revised 27 March 2019; accepted 21 June 2019

Dependences of the contrast ratio on the angular deviation of the optical axis with a step of 2 arcmin 28 arcsec have been obtained for Pockels cells based on beta barium borate crystals in the 49 arcmin 34 arcsec range. The investigation was conducted for a single Pockels cell and for a double cell based on optically aligned crystals. The results of investigations can be applied for the calculation of the laser beam focus in order to use a high contrast ratio in high-power laser systems when the light is modulated using Q-switching.

Keywords: optical properties, electro-optical effects, Q-switching, laser radiation characteristics, optical
transmission coefficients, nonlinear optical crystals
PACS: 78.20.Jq, 42.60.Gd, 42.60.Jf, 78.20.Ci, 42.70.Mp

POKELSO NARVELIŲ SU BETA BARIO BORATO KRISTALU KONTRASTO PRIKLAUSOMYBĖS NUO LAZERIO SPINDULIO IR OPTINĖS AŠIES KRYPČIŲ NESUTAPIMO TYRIMAS
Giedrius Sinkevičius^a,b, Algirdas Baškys^a,b

^aFizinių ir technologijos mokslų centras, Vilnius, Lietuva
^bGedimino technikos universiteto Elektronikos fakultetas, Vilnius, Lietuva

Atliktas Pokelso narvelio su beta bario borato kristalu kontrasto priklausomybės nuo optinės ašies nuokrypio kampo tyrimas 2 arcmin 28 arcsec geba, 49 arcmin 34 arcsec diapazone. Taip pat atlikta Pokelso narvelio su vienu kristalu ir su dviem optiškai išstatytais kristalais lyginamoji kontrasto priklausomybės nuo nuokrypio kampo analizė. Tyrimų rezultatus galima pritaikyti skaičiuojant lazerio spindulio fokusą siekiant užtikrinti aukštą Pokelso narvelio kontrastą didelės galios lazerių sistemose.

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