Flux growth and characterization of a new oxyborate crystal Na3La9O3(BO3)8

Zhang, Guochun; Wu, Yicheng; Li, Yunge; Feng, Chang; Pan, Shilie; Fu, Peizhen; Chen, Chuangtian

doi:10.1016/j.jcrysgro.2004.11.316

Cited by 44 publications

(25 citation statements)

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“…In the paper, the THz Time-Domain spectroscopy measurements were conducted to study the spectral responses of borates crystals Na 3 La 9 O 3 (BO 3 ) 8 [8] , SrB 4 O 7 , PbB 4 O 7 [9] , Na 5 [B 2 P 3 O 13 ] [10] and Zn 3 BPO 7 [11] . The THz time domain spectra were measured and the power absorption coefficient and refractive index were studied in the range of 0.25-2.5 THz.…”

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confidence: 99%

THz spectra of five borates crystals

Hou

Wang

et al. 2008

Chin. Sci. Bull.

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PBO). It is found that the samples had good transmission in 0.25-1.5 THz region. Both SBO and NLBO have an absorption coefficient less than 10 cm −1 . Among them, SBO has not only the smallest absorption coefficient but also a very flat dispersion in the frequency region under investigation. Distinct resonance absorption peaks are observed for ZBP at ν 1 = 1.4 THz, ν 2 = 2.0 THz and SBO at ν = 2.4 THz. In the spectrum of PBO, two abnormal dispersions appear in the frequency regions 1.44-1.74 and 2.2-2.5 THz. The absorption coefficients and refraction indices of the five crystals are extracted from the THz time-domain (THz-TDS) spectra in 0.25-2.5 THz region. The properties and origins of the spectral responses are addressed.borates crystals, THz spectroscopy, lattice vibrations, optical phonon THz (10 12 Hz) radiation fills up the gap between the microwave and the far-infared wave, and is very important in science and technical applications due to its unique features in interaction of electromagnetic waves with matter [1][2][3] . Studying basic physical phenomena of solid materials in THz region is the foundation for researching information materials and new THz sources, and provides experimental basis in looking for nonlinear crystal and functional material for devices development in THz region.THz spectroscopic responses of the crystalline samples are primarily related to lattice vibrations, optical phonon-photon, optical phonon-electron interaction, and other elementary excitations. The analysis on the THz spectral data can provide important knowledge of these physical processes, which may be difficult to access by other experimental methods. Therefore, new physical phenomena and properties can be found based on the THz experiments, such as electron spin resonance of semiconductor and ionic crystal, electron cyclotron resonance in metal and semiconductor, and polariton [4] .At present, the THz spectroscopic technology is playing a more and more important role in the study of the condensed matter physics, and acts as a complementary method to the well established far-infrared, Raman and neutron diffraction technology. For example, Raman scattering only arises in those lattice vibrations whose molecular polarizability can change but no varying dipole moments [5] , while the absorptions in infrared and THz frequency involves the lattice vibrations whose dipole moments change instantaneously. Thus it is crucial to use THz spectroscopy to study those vibrational modes which have no Raman activities.The merits of single crystals as optical material are their stable and reliable performance, durable and reproducible property. In the recent twenty years, China has made a great achivement in research and devel-

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confidence: 99%

THz spectra of five borates crystals

Hou

Wang

et al. 2008

Chin. Sci. Bull.

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“…The average Ln-O distances in each one of the environments are equal to 2.54 Å and 2.60 Å , respectively. One oxygen atom non-bonded to borate groups is surrounded by four La atoms constituting an OLn 4 …”

Section: Crystal Structure Descriptionmentioning

confidence: 99%

“…Recently a new oxyborate of formula Na 3 La 9 O 3 (BO 3 ) 8 has been discovered in the ternary diagram Na 2 O-La 2 O 3 -B 2 O 3 and its structure resolved [3,4]. The unit cell is hexagonal with space group P-62m (189).…”

Section: Introductionmentioning

confidence: 99%

First luminescence study of the new oxyborate Na3La9O3(BO3)8:Nd3+

Balda¹,

Jubera²,

Frayret³

et al. 2007

Optical Materials

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“…It has excellent technological and physical chemical features such as short growth period, large effective nonlinear coefficient, high damage threshold, high transparent window and good mechanical properties. Na 3 La 9 O 3 (BO 3 ) 8 is optically transparent within 270-2100 nm spectral range, free from moisture and chemically very stable [1]. NLBO crystallizes in the hexagonal structure [2].…”

Section: Introductionmentioning

confidence: 99%

“…It is necessary to add that many borates are used as laser hosts and nonlinear optical materials with harmonic generation applications [7][8][9][10][11]. Zhang et al [1] reported that the optical second harmonic generation (SHG) measurements of laser radiation have shown that NLBO crystals exhibit an optical SHG efficiency which is about 3-5 times larger than that for KH 2 PO 4 (KDP). As there are no experimental measurements and theoretical calculations of the electronic band structure and the density of states for NLBO, we perform such measurements and calculations in this paper and try to find physical origin of the investigated electronic band structure.…”

Section: Introductionmentioning

confidence: 99%