Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

[PDF] http://dx.doi.org/10.3952/lithjphys.49414

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 49, 433–438 (2009)

THERMAL LENS COMPENSATION IN HIGH AVERAGE POWER DIODE PUMPED Nd:YVO₄ LASER USING ASPHERIC MIRROR
D. Stučinskas^a, A. Varanavičius^a, R. Antipenkov^a, M. Grishin^b,c, J. Kodz^b, A. Melninkaitis^a, and A. Vanagas^a
^aDepartment of Quantum Electronics, Vilnius University, Saulėtekio 9, LT-10222 Vilnius, Lithuania
E-mail: darius.stucinskas@ff.vu.lt
^bEKSPLA Ltd, Savanorių 231, LT-02300 Vilnius, Lithuania
^cInstitute of Physics, Savanorių 231, LT-02300 Vilnius, Lithuania

Received 18 July 2009; revised 18 December 2009; accepted 18 December 2009

We demonstrate a high-power, diode-pumped, pulsed Nd:YVO₄ laser with a 1.2 diffraction-limited output of 9.5 W using a thin film deposition technology made aspheric mirror to correct the thermally induced phase distortion of the lasing medium.

Keywords: Nd:YVO₄, thermal lens compensation, diode-pumped, aspheric optics

PACS: 42.55.Xi, 42.60.By

ŠILUMINIO LĘŠIO KOMPENSAVIMAS ASFERINIU VEIDRODŽIU DIODINIO KAUPINIMO DIDELĖS VIDUTINĖS GALIOS Nd:YVO₄ LAZERYJE

D. Stučinskas^a, A. Varanavičius^a, R. Antipenkov^a, M. Grishin^b,c, J. Kodz^b, A. Melninkaitis^a, A. Vanagas^a
^aVilniaus universitetas, Vilnius, Lietuva
^bUAB EKSPLA, Vilnius, Lietuva
^cFizikos institutas, Vilnius, Lietuva

Pateikiami šiluminio lęšio sferinės aberacijos kompensavimo panaudojant asferinius rezonatoriaus elementus išilginio diodinio kaupinimo Nd:YVO₄ regeneratyviniame stiprintuve tyrimo rezultatai. Asferiniai optiniai elementai buvo pagaminti naudojant plonasluoksnių dangų garinimo technologiją. Šiluminio lęšio aberacijos buvo išmatuotos Shack'o ir Hartmann'o bangos fronto matuokliu. Remiantis matavimų rezultatais, pagaminta 10 kompensatorių, skirtų sferinės aberacijos korekcijai: ant sferinio BK7 pagrindėlio buvo užgarinti Gauso formos iškilumai. Vienas nuo kito kompensatoriai skyrėsi skirtingu užgarinto iškilumo aukščiu bei pločiu. Optimali kompensatoriaus padėtis rezonatoriuje buvo nustatoma atsižvelgiant į lazerio išvadinę galią bei lazerio išvadinio pluošto kokybės parametrą M². Naudojant asferinį kompensatorių, generavimo slenkstis sumažėjo daugiau kaip 3 kartus, taip pat žymiai pagerėjo lazerio pluošto intensyvumo skirstinys. Matuojant pluošto kokybės parametrus nustatyta, kad naudojant kompensatorius M² yra mažesnis nei 1,2 visame lazerio veikimo diapazone, tuo tarpu be kompensatoriaus M² būna nuo 1,2 iki 1,4.

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