Detailed characterization of thermal expansion tensor in monoclinic KRe(WO4)2 (where Re=Gd, Y, Lu, Yb)

Loiko, Pavel; Yumashev, K. V.; Кулешов, Н. В.; Rachkovskaya, G. E.; Pavlyuk, A. A.

doi:10.1016/j.optmat.2011.07.007

Cited by 36 publications

(28 citation statements)

References 24 publications

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“…According to our data, this is also true for the diode-pumping. Indeed, maximum and minimum values of the thermal expansion coefficient in the N m -N g plane correspond to the X' 1 and X' 3 principal axes, with N m^X ' 1 = 32.1° [21]. This is in agreement with our data, A^N m ~ 33°.…”

Section: Resultssupporting

confidence: 91%

Anisotropy of the photo-elastic effect in Nd : KGd(WO₄)₂laser crystals

Loiko¹,

Savitski²,

Kemp³

et al. 2014

Laser Phys. Lett.

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Abstract. The anisotropy of thermal lensing and the photo-elastic effect is characterized for diode-pumped Nd:KGd(WO 4 ) 2 crystals cut along the N p and N g optical indicatrix axes and along its optical axis, O = N g +43°, at a laser wavelength of 1067 nm. Distortions in the spatial profile of output laser beam are analyzed. The thermal lens is astigmatic; the orientation of its principal meridional planes, A and B, is determined by the anisotropy of photo-elastic effect. The thermal lens has opposite signs for rays lying in the principal meridional planes for N pand O-cut crystals; and it is positive for an N g -cut crystal. The increase of thermal lens optical power after absorption of 1 W of pump power, i.e. the thermal lens sensitivity factors M A(B) , and astigmatism degree S = |M A -M B | are determined. The photo-elastic effect was found to increase the optical power of thermal lens and was significant for all studied crystal orientations. [5][6][7][8] low-threshold diode-pumped lasers operating in the vicinity of 1 and 1.3 μm. KGW is a biaxial crystal, with three crystal orientations having been employed so far for laser engineering: along the b (N p ) axis [1][2][3][5][6][7][8], along the N g axis [9][10][11][12] and along the optical axis (O) [13,14], i.e. N g +43° in the N p -N g plane [15]. Strong astigmatism of the thermo-optical properties of the material results in significant variation in the sign and value of the thermal lens in crystals cut for light propagation along the N p and N g axes under diode-or flash-lamp pumping [9,12,15,16]. Thermal lens measurements were reported previously for the N p and N g -cut Nd:KGW crystals at the wavelength of 1.06 μm under the flash-lamp-pumping [9,15,16] and at the wavelength of 1.35 μm under the diode -pumping [12]. Keywords

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Section: Resultssupporting

confidence: 91%

Anisotropy of the photo-elastic effect in Nd : KGd(WO₄)₂laser crystals

Loiko¹,

Savitski²,

Kemp³

et al. 2014

Laser Phys. Lett.

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“…In the previous papers, athermal directions were calculated at fixed wavelength, only for principal planes of optical indicatrix and o-wave. As a result, it was concluded that such directions cannot exist in principle for several principal planes or light polarizations [15,19]. However, it is not confirmed, if we consider dispersion of athermal directions and existence of two isonormal waves in the biaxial crystal.…”

Section: Principal Planementioning

confidence: 93%

“…The expression for thermal expansion coefficient α in the direction of vector n is [deduced from more common one [31]): 4 are the diagonal components of thermal expansion tensor in the optical indicatrix frame and α mg ¼-6.1 is the non-zero non-diagonal component [19] (the units are 10 À 6 K À 1 ).…”

Section: Basic Equationsmentioning

confidence: 99%

“…These crystals are excellent hosts for doping with laser-active trivalent rare-earth ions like Yb 3 þ or Tm 3 þ , that results in the realization of high-efficient diode-pumped solid-state lasers [16,17] (including fs ones [18]). DTs offer (i) large and negative TOCs [12,15], (ii) strong optical anisotropy and (iii) anisotropy of thermal expansion [19]. Thus, all these features can lead to cancellation of OPL changes and provide the desired athermal behavior.…”

Section: Introductionmentioning

confidence: 99%

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All-space existence and dispersion of athermal directions in monoclinic KY(WO4)2

Loiko

Филиппов

Кулешов

et al. 2014

Optics Communications

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a b s t r a c tThe analytical expressions for thermo-optic coefficients, dn/dT, for "fast" and "slow" light waves propagating along the arbitrary direction in a biaxial crystal are derived. On the basis of these expressions, the all-space analysis of existence of athermal directions is performed for monoclinic and biaxial KY(WO 4 ) 2 at 1.03 μm. The calculations are performed for an arbitrary light propagation direction and polarization (not restricted to the principal planes). The appearance of directions that can be athermal for both "fast" and "slow" waves is predicted. The dispersion of athermal directions is analyzed for visible and near-IR. The existence of upper and lower dispersion limits for athermal behavior of KY (WO 4 ) 2 is shown. It is shown that the optical indicatrix axes can be athermal itself at some light wavelengths. Wavelength-and temperature-dependent position of the optical axes of KY(WO 4 ) 2 is also determined.

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“…3, see details in [24]. It contains two non-diagonal elements, denoted as α ac* = α c*a = -4.08×10 -6 K -1 .…”

Section: Crystal Growthmentioning

confidence: 99%