[PDF]    http://dx.doi.org/10.3952/lithjphys.50202

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 50, 191–199 (2010)

D. Stučinskas, R. Antipenkov, and A. Varanavičius
Deptartment of Quantum Electronics, Faculty of Physics, Vilnius University, Saulėtekio 9 bldg. 3, LT-10222 Vilnius,

E-mail: darius.stucinskas@ff.vu.lt

Received 25 August 2009; revised 4 May 2010; accepted 17 June 2010

We investigated thermal-lensing effects in a diode end-pumped Yb:KGW laser with slab shaped active element. Performance and thermal lensing properties for Ng cut Yb:KGW and Yb:KGW cut for athermal propagation direction are presented. It is found that crystal cut along athermal direction provides weaker thermal lens than Ng cut active element, however, due to anisotropic Yb:KGW characteristics, thermal lens is highly astigmatic. End bulging contribution to thermal lensing under intense pump was measured (for Ng cut active element).
Keywords: Yb:KGW, thermal lens, diode-pumped, athermal orientation
PACS: 42.55.Xi, 42.60.By

D. Stučinskas, R. Antipenkov, A. Varanavičius
Vilniaus universitetas, Vilnius, Lietuva

Pateikiame eksperimentinius kaupinimo ir lazerinio generavimo indukuoto šiluminio lęšio aktyviajame Yb:KGW elemente matavimų rezultatus. Aktyviajame lazerio elemente indukuoto šiluminio lęšio laužiamosios gebos priklausomybė nuo kaupinimo galios buvo nustatyta matuojant zonduojančio pluošto bangos fronto pokytį Šako (Shack) ir Hartmano (Hartmann) matuokliu. Matavimus atlikome su dviejų skirtingų orientacijų aktyviaisiais elementais: z \parallel Ng ir atermalinės \anglez : Ng = 44c^{\circ} orientacijos Yb:KGW kristalais. Taip pat buvo atlikti matavimai siekiant išsiaiškinti aktyviojo elemento galų išsigaubimo įtaką termolęšio laužiamajai gebai z \parallel Ng orientacijos aktyviuosiuose elementuose.

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