Optical properties of some borate single crystals (original) (raw)
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New nonlinear optical and laser crystals of borate family
Journal of Materials Science: Materials in Electronics, 2007
Er,Yb):YAl 3 (BO 3 ) 4 single crystals have been obtained using K 2 Mo 3 O 10 based flux by dipping seeded solution growth at a cooling rate of 0.2-5°C/day at temperatures from 1060°C to 1000°C. The Er and Yb segregation coefficients vary from 0.80 to 1.02. A valuable technique for characterizing the non-linear performance of the crystal to identify the presence of twins in borate materials has been developed. Over 1.1 W of green emission was obtained from a diode-pumped Yb:YAB laser. Spectroscopic properties of Er,Yb:YAB crystals have been investigated leading to the demonstration of efficient continuous-wave (CW) and Q-switched diode-pumped (Er,-Yb):YAB laser operation.
Journal of the Optical Society of America B, 1999
The doped nonlinear optical crystal, ytterbium: yttrium aluminum borate, Yb 3ϩ :YAl 3 (BO 3 ) 4 , has been grown with good optical quality in a high-temperature solution from K 2 Mo 3 O 10 and B 2 O 3 fluxes. Room-and lowtemperature absorption and fluorescence spectra have been measured, and spectral parameters have been calculated. The ground-state energy-level splitting is 581 cm Ϫ1 . The emission lifetime, the absorption cross section, and the peak emission cross section are 0.68 ms, 3.4 ϫ 10 Ϫ20 cm 2 , and 0.8 ϫ 10 Ϫ20 cm 2 , respectively. In comparison with established laser crystals, the results for the cross sections, lifetime, and energy splitting suggest that this crystal has potential as an efficient self-frequency-doubled laser operating in the green.
Optical Materials, 2007
Pure and Nd 3+ doped single crystals of Gd 1- xR xCa 4O(BO 3) 3 (R 3+ = Sc 3+ or Lu 3+) with large size and good quality have been grown by the Czochralski pulling technique. By changing the compositional parameter x of Gd 1- xR xCa 4O(BO 3) 3 crystals, their optical birefringence can be controlled in order to achieve non-critical phase matching (NCPM) in the ranges of 790-824 nm along Y-axis and 920-963 nm along Z-axis, during second harmonic generations. Nonlinear optical properties of these new biaxial borate crystals are reported. Preliminary investigations of self frequency doubling in NCPM condition in Gd 1- x- yR xNd yCa 4O(BO 3) 3 crystals have been carried out.
Nonlinear optical properties of neodymium yttrium aluminum borate crystals
Soviet Journal of Quantum Electronics, 1983
An investigation was made of the linear and nonlinear optical properties of new neodymium yttrium aluminum borate crystals. These crystals were found to be suitable for use as multifunctional laser media and as nonlinear media capable of efficient frequency conversion of laser radiation.
Growth and study of nonlinear optical crystals at the Hungarian Academy of Sciences
The former Research Laboratory for Crystal Physics continues the growth and defect structure investigation of nonlinear optical single crystals in a new organization, as a part of the Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences. The aim of the activity is to prepare specific crystals for basic and applied research as well as for applications. We improve the quality or modify the properties of well known nonlinear oxide and borate crystals and develop new materials. The principle nonlinear optical crystals in our profile are the followings: Paratellurite (TeO 2 ), congruent, Mg-doped and stoichiometric lithium niobate (LiNbO 3 ), a variety of sillenite structured crystals (Bi 12 MeO 20 , Me=Si, Ge, Ti, etc.), bismuth tellurite (Bi 2 TeO 5 ) and nonlinear borates (BBO-β -BaB 2 O 4 , LBO-LiB 3 O 5 , LTB-Li 2 B 4 O 7 , CLBO-CsLiB 6 O 10 and YAB-YAl 3 (BO 3 ) 4 ). Details of the crystal preparation and the major achievements are discussed in the paper.
Applied Physics Letters, 1997
A 2 in. diam single crystal of lithium tetraborate (Li 2 B 4 O 7 ) was successfully grown by the Czochralski method. The crystal was free from macrodefects and had a dislocation density as low as 100/cm 2 . It had an excellent homogeneity of the refractive index and a wide transparency down to 170 nm. The optical damage threshold was 40 GW/cm 2 . Second-harmonic generation and sum frequency generation were investigated in association with the generation of the fourth and fifth harmonics of a Q-switched Nd:YAG laser. The conversion efficiency of the second-harmonic generation from the green ͑532 nm͒ light was 20%.
IEEE Journal of Quantum Electronics, 1999
We describe experiments characterizing a new nonlinear optical crystal, YCa 4 O(BO 3 ) 3 (YCOB). This crystal has a number of advantages over other commonly available nonlinear optical crystals. It has a higher nonlinear coefficient than KDP, can be fabricated to large sizes (3-in diameter, 8-in length), and has a high damage threshold. Moreover, this new nonlinear optical crystal is nonhygroscopic, has good optical quality and mechanical properties, allowing easy optical polishing. This crystal, YCa4O(BO3)3, commonly termed YCOB, is one of a family of new nonlinear crystals, the oxyborates, that include RECa4O(BO3)3 (RE=La 3+ , Lu 3+ , Y 3+ , Sm 3+ , Gd 3+ , Er 3+ , and Nd 3+ ). In this paper, we also successfully demonstrate a technique for improving the nonlinear optical properties of this crystal. This technique, ion subsitution, has hetertofore had limited success with other crystal hosts. However, the inclusion of yttrium in YCOB provides the opportunity to exploit this technique. Yb 3+ , which has larger mass, but approximately the same atomic size as Y 3+ , can be substituted into the crystal structure without introducing stress and nonuniformities. A systematic investigation of the linear and nonlinear characteristics of several crystals doped with various levels of Yb demonstrate that selective substitution of Yb in YCa 4 O(BO 3 ) 3 improves the second-harmonic conversion efficiency by increasing the optical nonlinearity. Index Terms-Frequency conversion, nonlinear optical materials, nonlinear optics, rare-earth-doped materials, secondharmonic generation, YCa 4 O(BO 3 ) 3 .