Temperature-dependent spectroscopy and microchip laser operation of Nd:KGd(WO4)2

Loiko, Pavel; Yoon, Soojin; Serres, Josep María; Mateos, Xavier; Beecher, Stephen J.; Birch, Rolf B.; Savitski, Vasili; Kemp, Alan J.; Yumashev, K. V.; Griebner, Uwe; Petrov, Valentín; Aguiló, Magdalena; Díaz, Francesc; Mackenzie, Jacob I.

doi:10.1016/j.optmat.2016.06.005

Cited by 13 publications

(13 citation statements)

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“…A large number of double molybdates and tungstates of alkaline elements with di-or trivalent metals is an area of increasing interest because of the wide range of important physical properties and because of the potential applications of these compounds, such as promising optical materials (Maczka et al, 2012;Shimemura et al, 2017), effective phosphors (Benoît et al, 2011;Mo et al, 2012;Wang et al, 2009), laser materials (Balda et al, 2006;Yu et al, 2016;Loiko et al, 2016), as well as ferroelectrics (Isupov, 2005a,b) and solidstate electrolytes (Savina et al, 2013;Tsyrenova et al, 2016;Shukaev et al, 2016;Solodovnikov et al, 2017). Double molybdates and tungstates of two different alkali cations are also of special interest.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, crystal structures and properties of the new compounds K_7–xAg_1+x(XO₄)₄ (X = Mo, W)

Spiridonova

Солодовников

Savina

et al. 2017

Acta Crystallogr C Struct Chem

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Two new isostructural compounds, namely heptapotassium silver tetrakis(tetraoxomolybdate), KAg(MoO) (0 ≤ x ≤ 0.4), and heptapotassium silver tetrakis(tetraoxotungstate), KAg(WO) (0 ≤ x ≤ 0.4), have been synthesized and found to crystallize in the polar space group P6mc (Z = 2) with the unit-cell dimensions a = 12.4188 (2) and c = 7.4338 (2) Å for KAg(MoO) (single-crystal data), and a = 12.4912 (5) and c = 7.4526 (3) Å for KAg(WO) (Rietveld analysis data). Both structures represent a new structure type, with characteristic [K1(XO)] `pinwheels' of K1O octahedra and six XO tetrahedra (X = Mo, W) connected by common opposite faces into columns along the c axes. The octahedral columns are linked to each other through Ag1O tetrahedra along with the K2 and K3/Ag2 polyhedra, forming the polar rods (...Ag1O-X1O-empty octahedron-Ag1O...). Ag1 is located almost at the centre of the largest face of its coordination tetrahedron and seems to have some mobility. The new structure type is related to the BaNdAlO and CaBaSiO types, and to other structures of the α-KSO-glaserite family. The differential scanning calorimetry (DSC) and second harmonic generation (SHG) results show that both compounds undergo first-order phase transformations to high-temperature centrosymmetric phases.

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Section: Introductionmentioning

confidence: 99%

Synthesis, crystal structures and properties of the new compounds K_7–xAg_1+x(XO₄)₄ (X = Mo, W)

Spiridonova

Солодовников

Savina

et al. 2017

Acta Crystallogr C Struct Chem

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“…Therefore, the probability of multiphonon relaxation is inherently small. The finding that the lifetime has no significant dependence on the temperature is consistent with the reported lifetime determined from the luminescence decay of the 4 F3/2 state in KG(WO4)2:Nd 3+ which was nearly independent to the temperature within 77-450 K [147]. …”

Section: Temperature Dependence Of Luminescent Lifetimesupporting

confidence: 88%

“…4.5 is further examined by considering the temperature dependent absorption cross-section data reported for KG(WO4)2:Nd 3+ [147]. At 300 K, the peak absorption cross-section at 810.…”

Section: Temperature Dependence Of Major Absorption Linesmentioning

confidence: 99%

Potassium double tungstate waveguides with high ytterbium concentration for optical amplification

Yong

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Cover design: Three dimensional visualization of optical amplification in potassium double tungstate waveguide layer as a signal beam propagates from the top surface to the bottom surface. The model has a radius equivalent to about twenty times the optical beam's radius and only a quarter of the body is shown. The intensity of the signal beam is represented by the color spectrum (red being lowest and blue being highest). The wire frame is generated based on finite element mesh grids.

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“…Main optical & thermo-optical properties of this crystal are listed in Table 2.3. In figure 2.2 absorption and emission spectra are provided for T = 300 K and E//Nm polarized light which has the strongest gain [37]. Although less common, other lasing polarizations can be also used in cases where lower gain is needed.…”

Section: Optical Properties Of Kgw Crystalmentioning

confidence: 99%

Passive mode-locking of Nd:KGW laser with hot band diode pumping

Halim

Talukder

Waritanant

2016

2016 Photonics North (PN)

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Solid-state lasers are capable of providing versatile output characteristics with greater flexibility compared to other popular laser systems. Lasing action has been achieved in many hundreds of solid-state media, but Nd-ion doped gain media are widely used to reach high power levels with short pulses. In this work, commercially available Nd:KGW crystal served as a gain medium to achieve pulsed operation at 1067 nm. This laser crystal offers large stimulated emission crosssection and gain bandwidth which facilitates generation of high peak power pulses in the picosecond regime. The KGW crystal is monoclinic and biaxial in structure, and anisotropic in its optical and thermal properties. Due to poor thermal conductivity, this crystal can be operated within a limited power range before crystal fracture takes place. To reduce the amount of heat deposited in the gain media, we introduced a new pumping wavelength of 910 nm which reduces the quantum defect by more than 45%. Continuous-wave laser operation was optimized to operate in mode-locked regime. In order to achieve short light pulses from the continuous-wave laser, one of the end mirrors was replaced by a semiconductor saturable absorber mirror (SESAM) to generate 2.4 ps pulses at a repetition rate of 83.8 MHz. An average output power of 87 mW was obtained at lasing wavelength of 1067 nm and the beam was nearly diffraction limited with M 2 < 1.18. The peak power of the generated pulses was 427 W and energy of each pulse was >1 nJ. Pumping the crystal at longer wavelength (910 nm) reduced the thermal lensing of the crystal by half when compared to conventional pumping at shorter wavelength (808 nm). To the best of our knowledge, this is the first time passive mode-locking of a Nd:KGW laser was explored using the pump wavelength at 910 nm. III Acknowledgements I am deeply grateful to our supervisor Dr. Arkady Major. Over the last two years he has always guided us towards right direction and supported us with new ideas and technical solutions. Throughout the course of experiment Tanant Waritanant, PhD candidate under Dr. Major's supervision has been extensively helpful. He is one of the smartest characters that I have ever come across. I would also like to thank Reza Akbari and Rubel Chandra Talukder. Reza helped me to get through theoretical ambiguities and introduced me with experimental systems. Rubel motivated me to cut decent figures in the courses and maintain good research esteem to successfully achieve experimental goals. My other groupmates Sujith, Shirin, Anvar and Chandan has supported me to keep high spirit. I would also like to thank the members of my committee, Prof. Sherif Sherif and Prof. Olanrewaju Ojo for taking the time to review my thesis and participate in my defense. IV

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Temperature-dependent spectroscopy and microchip laser operation of Nd:KGd(WO4)2

Cited by 13 publications

References 37 publications

Synthesis, crystal structures and properties of the new compounds K_7–xAg_1+x(XO₄)₄ (X = Mo, W)

Synthesis, crystal structures and properties of the new compounds K_7–xAg_1+x(XO₄)₄ (X = Mo, W)

Potassium double tungstate waveguides with high ytterbium concentration for optical amplification

Passive mode-locking of Nd:KGW laser with hot band diode pumping

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Temperature-dependent spectroscopy and microchip laser operation of Nd:KGd(WO4)2

Cited by 13 publications

References 37 publications

Synthesis, crystal structures and properties of the new compounds K7–x Ag1+x (XO4)4 (X = Mo, W)

Synthesis, crystal structures and properties of the new compounds K7–x Ag1+x (XO4)4 (X = Mo, W)

Potassium double tungstate waveguides with high ytterbium concentration for optical amplification

Passive mode-locking of Nd:KGW laser with hot band diode pumping

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Synthesis, crystal structures and properties of the new compounds K_7–xAg_1+x(XO₄)₄ (X = Mo, W)

Synthesis, crystal structures and properties of the new compounds K_7–xAg_1+x(XO₄)₄ (X = Mo, W)