Thermal lensing in diode-pumped [001]-cut tetragonal crystals

Yumashev, K. V.; Loiko, Pavel

doi:10.1016/j.optcom.2015.07.026

Cited by 4 publications

(7 citation statements)

References 25 publications

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“…To date, analytical description of thermal lensing in a-cut tetragonal crystals (when considering the aniso tropy of their elastic, photo-elastic and thermal properties) has not been performed. Very recently, we have performed such a study for c-cut tetragonal crystals [19]. In the present work, we aimed to describe analytically thermal lensing in diode-pumped a-cut tetragonal crystals.…”

Section: Photo-elastic Effect Thermal Lensing and Depolarization In A...mentioning

confidence: 99%

“…The χ′ term can be either determined experimentally by analyzing the interference pattern formed by the light beam reflected from the distorted end-facet of a laser crystal and a reference beam [24,25], or it can be derived theoretically from the solution of the stress-strain problem, see [9]. In contrast, the χ″ term can be accurately determined only from the theoretical calculations that are based on the solution of the photo-elastic problem, see [11,19]. A single experimental possibility for an indirect estimation of the χ″ term is based on the measurements of the optical power of the thermal lens [12,26].…”

Section: Thermal Lensmentioning

confidence: 99%

“…The explicit form of this matrix in the crystal-physical and 'working' frames is shown in appendix 1. The procedure of transformation of this matrix from the 'working' to the 'rotated' frame can be found elsewhere [19].…”

Section: Photo-elastic Effectmentioning

confidence: 99%

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Photo-elastic effect, thermal lensing and depolarization ina-cut tetragonal laser crystals

Yumashev¹,

Zakharova²,

Loiko

2016

Laser Phys.

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We report on analytical description of thermal lensing effect in tetragonal crystals cut along the [1 0 0] crystallographic axis, for the two principal light polarizations, E ┴ c and E || c, under diode-pumping (plane stress approximation). Within this approach, we take into account anisotropy of elastic, photo-elastic, thermal and optical properties of the material. Expressions for the 'generalized' thermo-optic coefficient χ are presented. It is shown that astigmatism of thermal lens is determined both by the photo-elastic and end-bulging effects. The sign of the photo-elastic term χ″ can be either positive or negative affecting significantly the sign of the thermal lens. Depolarization loss in a-cut tetragonal crystals is few orders of magnitude lower than that in cubic crystals. Calculations are performed for a-cut tetragonal molybdates, Nd:CaMoO 4 , Nd:PbMoO 4 and Nd:NaBi(MoO 4 ) 2 .

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Section: Photo-elastic Effect Thermal Lensing and Depolarization In A...mentioning

confidence: 99%

Section: Thermal Lensmentioning

confidence: 99%

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Photo-elastic effect, thermal lensing and depolarization ina-cut tetragonal laser crystals

Yumashev¹,

Zakharova²,

Loiko

2016

Laser Phys.

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“…x r and ′ θ x (figure 1(b)). Their orientation is not strictly linked to the crystal-physical frame and can vary depending on the selected point in the disc plane [21]. We will define the orientation of the ′…”

Section: Physical Modelmentioning

confidence: 99%

“…determination of the components of the dielectric impermeability tensor with consideration of the thermal stress distribution. In an analytical form, this has been performed for glasses and cubic crystals like YAG [2,7] and also (very recently) for tetragonal crystals [21]. The description of the depolarization losses in Nd:YAG is well-known; see the state-of-the-art paper by Koechner and Rice [1].…”

Section: Introductionmentioning

confidence: 99%

Depolarization inc-cut tetragonal laser crystals

Yumashev

Loiko

2015

Laser Phys.

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Thermally induced birefringence and depolarization are described analytically for diodepumped laser discs from [0 0 1]-cut tetragonal crystals. It is shown that the depolarization losses R can be minimized by an appropriate orientation of a polarizer with respect to the crystallographic axes. Calculations are performed for tetragonal scheelite-type molybdate laser crystals, Nd:PbMoO 4 , Nd:CaMoO 4 and Nd:NaBi(MoO 4 ) 2 . Nd:CaMoO 4 provides the lowest depolarization losses, R < 15% with a very weak dependence on the absorbed pump power (for optimized light polarization, E || [1 1 0]).

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