Direct measurement of the dielectric frame rotation of monoclinic crystals as a function of the wavelength

Traum, C.; Inácio, Patrícia L.; Felix, Corinne; Segonds, Patricia; Peña, Alexandra; Debray, Jérôme; Boulanger, Benoı̀t; Petit, Yannick; Rytz, Daniel; Montemezzani, Germano; Goldner, Ph.; Ferrier, Alban

doi:10.1364/ome.4.000057

Cited by 29 publications

(9 citation statements)

References 5 publications

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“…On the contrary, the non-directional fluorescence spontaneous emission is not that easy to analyze, due to the generally rather large angular collection of the fluorescence, which can blur the CR observation and the angular distribution of the fluorescence in polarized light [21]. Moreover, an additional study of the CR at the fluorescence wavelength involved in the laser emission regime would have required first to characterize the potential orientation dispersion of the dielectric frame with wavelength, especially at the wavelengths of interest here, as recently observed elsewhere [35], and second to study the orientation dispersion of the optic axes properly defined in the relevant dielectric frame [36]. Depending on these two types of dispersion, the optical axes of the two involved wavelengths (the pump and the emitted laser ones) may be sufficiently separated so that the orientation of our crystals may lead to solicit the CR only for the pump wavelength.…”

Section: Resultsmentioning

confidence: 94%

Orientation and polarization dependence of both the absorption and the laser efficiency around the optic axis in monoclinic $$\hbox {Ho}^{3+}$$ Ho 3 + :KYW

et al. 2015

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singularity of the index surface along the optic axes of these crystals, collimated laser beams undergo a conical distribution of the energy propagation that corresponds to an internal conical refraction. However, no practical application was immediately found for this effect after its discovery. It has been studied sporadically during the twentieth century [2][3][4]. Nowadays, some applications, trying to take advantage of this effect, are under investigation as beam transformation [5-9], optical tweezers [10,11], microscopy [12] and laser sources [13][14][15][16]. This recent increase in publications on this effect can be explained by the availability of biaxial crystals with good optical quality needed to observe the conical refraction (CR). Even if the diffraction theory, proposed in 1978 [17] and reformulated in 2004 [18], is able to well predict the CR pattern, the resonant mode inside a laser cavity is still not well known up to now.Lasing along the optic axis in KGd(WO 4 ) 2 (KGW) has gained a lot of interest since this orientation has been reported to be an athermal direction [19]. Then, several studies have reported the effect of conical refraction along this orientation [13][14][15]. The thermo-optic properties in such orientation have been recently measured [20]. They reported an astigmatic thermal lens along the optic axis of neodymium-doped KGW. This is not in agreement with the very good beam quality observed in [14] and rises the question of the influence on the beam quality of the conical refraction.Furthermore, for lasers, spectroscopic properties are of great influence on the overall performance. In case of a biaxial crystal, those properties are strongly dependent on the orientation and on the polarization. Those properties have been well described in another monoclinic host, the neodymium-doped YCa 4 O(BO 3 ) 3 (YCOB) [21]. However, for the holmium-doped KY(WO 4 ) 2 (KYW) monoclinic crystal used in this paper, which is very similar to KGW Abstract We report on the absorption profile of the monoclinic holmium-doped KY(WO 4 ) 2 crystal near the optic axis for the maximal absorption wavelength at 1960 nm. The full angular distribution of the absorption coefficient at the vicinity of such optical singularity has been experimentally and numerically investigated. Furthermore, laser experiments along the optic axis have been carried out. Socalled conical refraction laser and classical Gaussian laser operation are compared near the optic axis, taking into account the complex absorption profile.

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Section: Resultsmentioning

confidence: 94%

Orientation and polarization dependence of both the absorption and the laser efficiency around the optic axis in monoclinic $$\hbox {Ho}^{3+}$$ Ho 3 + :KYW

et al. 2015

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“…It is interesting that, by changing the wavelength, temperature or any other refractive index dispersive parameters, the dielectric frame may rotate in the plane perpendicular to the b (Y, N p ) axis as shown in Fig. 1(b) [15,16]. Our experiment shows that the b-cut Nd:KLuW 1070 nm laser emission at room temperature is linearly polarized and the naturally selected polarized emission direction is at 8.5°w…”

Section: Introductionmentioning

confidence: 78%

An efficient frequency-doubled Nd:KLu(WO4)2 laser at 535nm

Zhang

Liu

et al. 2016

Optics & Laser Technology

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“…mainly on the chemical crystal composition [29]. As a result, indeed all three cases (b || X, Y or Z) are possible for such crystals [30]. The calculation of n is based on the point-dipole model and uses the crystallographic refinement.…”

Section: Table 1 Thermal Expansion Coefficients For Ycob and Gdcob Cmentioning

confidence: 99%

“…Accordingly, the dn/dT value can be represented as a sum of the terms related to the above mentioned effects, (dn/dT) α + (dn/dT) g [30]. The first term, (dn/dT) α , has weaker wavelength dependence and it is negative.…”

Section: Table 1 Thermal Expansion Coefficients For Ycob and Gdcob Cmentioning

confidence: 99%

Thermo-Optic Dispersion Formulas for YCOB and GdCOB Laser Host Crystals

Loiko

Mateos

Wang

et al. 2015

Advanced Solid State Lasers

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Abstract:We report on a comparative study of anisotropy and dispersion of thermo-optic coefficients, dn/dT, and thermal coefficients of the optical path for monoclinic oxoborate YCOB and GdCOB laser host crystals. Near 1 μm, all dn/dT coefficients are found to be negative: dn X /dT = -1.2, dn Y /dT = -3.7 and dn Z /dT = -2.5 × 10 −6 K −1 for YCOB, dn X /dT = -3.8, dn Y /dT = -4.8 and dn Z /dT = -3.7 × 10 −6 K −1 for GdCOB. Thermo-optic dispersion formulas are derived for these crystals in the spectral range of 0.4-2 μm. The existence of athermal directions is predicted for both YCOB and GdCOB.

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Direct measurement of the dielectric frame rotation of monoclinic crystals as a function of the wavelength

Abstract: International audienceWe report a method based on Malus' law to directly measure the dielectric frame orientation of monoclinic crystals with an accuracy of 0.3°. This technique was validated by the study of Nd3+:YCa4O(BO3)3, Sn2P2S6, BiB3O6 and Eu3+:Y2SiO

Cited by 29 publications

References 5 publications

Orientation and polarization dependence of both the absorption and the laser efficiency around the optic axis in monoclinic $$\hbox {Ho}^{3+}$$ Ho 3 + :KYW

Orientation and polarization dependence of both the absorption and the laser efficiency around the optic axis in monoclinic $$\hbox {Ho}^{3+}$$ Ho 3 + :KYW

An efficient frequency-doubled Nd:KLu(WO4)2 laser at 535nm

Thermo-Optic Dispersion Formulas for YCOB and GdCOB Laser Host Crystals

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