title: Angular dependence of the thermal-lens effect on LiSrAlF6 and LiSrGaF6 single crystals.
abstract: We apply thermal-lens (TL) spectrometry to measure the angular dependence of the TL effect on colquiriite single crystals. The experiments were performed with LiSrAlF(6) and LiSrGaF(6) using a two-beam mode-mismatched configuration. The results show that it is possible to minimize the TL effect by selecting the appropriate crystal orientation. Our data also show that the anisotropy of the linear thermal expansion coefficient drives the amplitude of the TL effect, including the inversion from focusing to defocusing as the crystal orientation angle tends to the c-axis direction. The results may be useful for those working to develop a high-power laser using LiSrAlF(6)(:Cr) and LiSrGaF(6)(:Cr) single crystals, allowing for optimization of the designed laser cavity.
authors.affiliation: Departamento de Física, Universidade Estadual de Maringá, CEP 87020-900, Maringá, Paraná, Brazil.
authors.forename: Alysson
authors.initials: A
authors.lastname: Steimacher
authors.forename: Otavio Akira
authors.initials: OA
authors.lastname: Sakai
authors.forename: Antonio Carlos
authors.initials: AC
authors.lastname: Bento
authors.forename: Mauro Luciano
authors.initials: ML
authors.lastname: Baesso
authors.forename: Antonio N
authors.initials: AN
authors.lastname: Medina
authors.forename: Sandro Marcio
authors.initials: SM
authors.lastname: Lima
authors.forename: Tomaz
authors.initials: T
authors.lastname: Catunda