Near-infrared photoluminescence from Ho3+-doped monoclinic KLu(WO4)2 crystal codoped with Tm3+

Jambunathan, Venkatesan; Mateos, Xavier; Pujol, María Cinta; Carvajal, Joan J.; Aguiló, Magdalena; Díaz, Francesc

doi:10.1016/j.jlumin.2009.04.081

Cited by 14 publications

(5 citation statements)

References 11 publications

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“…The linear absorption coefficient varies from 0.4 cm −1 up to 1.5 cm −1 by changing the polarization. In similar matrices for 'classical' orientation along dielectric axes N p (X) or N g (Z), the polarization E N m always exhibits higher absorption [30,31]. This is in agreement with our measurement.…”

Section: Methodssupporting

confidence: 90%

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: Methodssupporting

confidence: 90%

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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“…The optimized methodology of growth for KREW crystals can be found elsewhere [11]. Spectroscopy of codoped (Ho,Tm):KLuW was characterized in terms of polarized optical absorption and photoluminescence, and the relevant information can be found in a previous work [19]. Detailed and extended data related with the crystal growth and optical spectroscopy of a whole series of (Ho,Tm):KLuW co-doping ratios will be published elsewhere.…”

Section: Crystal Growth and Spectroscopymentioning

confidence: 99%

Continuous-wave co-lasing in a monoclinic co-doped (Ho,Tm):KLu(WO4)2 crystal

et al. 2011

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We present continuous-wave laser operation at two wavelengths oscillating simultaneously and originating from two different active ions in a monoclinic co-doped (Ho,Tm):KLu(WO4)2 crystal. Dual-wavelength lasing is accomplished at room temperature using Ti:Sapphire laser pumping. The Ho-ion, lasing at 2061 nm and the Tm-ion, lasing at 1937 or 1919 nm, generate together a maximum output power of 244 mW with a maximum slope efficiency of 24.8%. Tuning with a birefringent filter is possible from 1854 to 2063 nm, with individual tuning ranges of 1854 to 1980 nm for Tm and 1971 to 2063 nm for Ho.

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“…The optimized methodolgy of growth for KREW crystals can be found elsewhere [5]. Spectroscopy of co-doped (Ho,Tm):KLuW was characterized in terms of polarized optical absorption and photoluminescence, and the relevant information can be found in a previous work [6]. From the absorption spectra it was found that Tm 3+ has a maximum absorption cross-section of 5.2×10 -20 cm 2 at 802 nm for E//N m .…”

Section: Experimental Details and Resultsmentioning

confidence: 99%

Simultaneous Dual-Wavelength Laser Operation in Co-Doped (Ho,Tm):KLu(WO4)2 Crystal

Jambunathan

Mateos

Pujol

et al. 2011

Advances in Optical Materials

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Near-infrared photoluminescence from Ho3+-doped monoclinic KLu(WO4)2 crystal codoped with Tm3+

Cited by 14 publications

References 11 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

Continuous-wave co-lasing in a monoclinic co-doped (Ho,Tm):KLu(WO4)2 crystal

Simultaneous Dual-Wavelength Laser Operation in Co-Doped (Ho,Tm):KLu(WO4)2 Crystal

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