scholarly journals Photorefractive Properties of Molybdenum and Hafnium Co-Doped LiNbO3 Crystals

Crystals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 322 ◽  
Author(s):  
Ling Zhu ◽  
Dahuai Zheng ◽  
Shahzad Saeed ◽  
Shuolin Wang ◽  
Hongde Liu ◽  
...  
Keyword(s):  
Response Time ◽  
Absorption Spectra ◽  
High Intensity ◽  
Threshold Concentration ◽  
Czochralski Technique ◽  
Damage Resistance ◽  
Optical Damage ◽  
Uv Visible ◽  
532 Nm ◽  
Co Doped

A series of LiNbO3: Mo, Hf crystals with 0.5 mol % fixed MoO3 and various HfO2 concentrations (0.0, 2.0, and 3.5 mol %) were grown by the Czochralski technique. The photorefractive properties of the LiNbO3: Mo, Hf crystals were investigated by two-wave coupling measurements and the beam distortion method was employed to obtain the optical damage resistance ability. The UV-visible and OH− absorption spectra were also studied. The experimental results imply that the photorefractive properties of LiNbO3: Mo crystals at laser wavelengths of 532, 488, and 442 nm can be greatly enhanced by doping HfO2 over the threshold concentration. At 442 nm especially, the response time of LN: Mo, Hf3.5 can be shortened to 0.9 s with a diffraction efficiency of 46.07% and a photorefractive sensitivity reaching 6.28 cm/J. Besides this, the optical damage resistance at 532 nm is 3 orders of magnitude higher than that of the mono-doped LiNbO3: Mo crystal, which is beneficial for applying it in the field of high-intensity lasers.

STRUCTURE AND OPTICAL DAMAGE RESISTANCE IN In:Mn:Fe:LiNbO3 CRYSTALS

2004 ◽  
Vol 18 (16) ◽  
pp. 841-846
Author(s):  
XIHE ZHEN ◽  
QIANG LI ◽  
YUHENG XU
Keyword(s):  
Absorption Spectra ◽  
Defect Structure ◽  
Threshold Concentration ◽  
Beam Pattern ◽  
Damage Resistance ◽  
Transmitted Beam ◽  
Optical Damage

A series of In : Mn : Fe : LiNbO 3 crystals were prepared with fixed concentrations of Fe 2 O 3, MnCO 3 and various concentrations of In 2 O 3. Their ultraviolet-visible (UV-Vis) absorption spectra were measured in order to investigate their defect structure. The optical damage resistance of In : Mn : Fe : LiNbO 3 crystals was characterized by the transmitted beam pattern distortion method. It increases remarkably when the concentration of In 2 O 3 is over its threshold concentration. The optical damage resistance of In (3.0 mol %): Mn : Fe : LiNbO 3 crystal is two orders of magnitude higher that of the Mn : Fe : LiNbO 3 crystal. The dependence of the defects on the optical damage resistance of the In : Mn : Fe : LiNbO 3 crystals was discussed.

EFFECT OF HfO2-CODOPING CONCENTRATION ON THE OPTICAL PROPERTIES OF Er3+-DOPED LiNbO3

2010 ◽  
Vol 24 (04n05) ◽  
pp. 495-502 ◽  
Author(s):  
LI DAI ◽  
YAN-QING SU ◽  
SHI-PING WU ◽  
YANG MU ◽  
JING-JIE GUO ◽  
...  
Keyword(s):  
Infrared Absorption Spectrum ◽  
Czochralski Technique ◽  
Visible Absorption ◽  
Damage Resistance ◽  
Transmitted Beam ◽  
Structure Defects ◽  
Optical Damage ◽  
X Ray ◽  
Co Doping ◽  
Co Doped

A series of Hf , Er co-doped LiNbO 3 crystals were grown by Czochralski technique with 1 mol% of Er 2 O 3 and with 2, 4, 6 and 8 mol% of HfO 2, respectively. The optical damage resistance of Hf : Er : LiNbO 3 crystals was studied by the transmitted beam pattern distortion method. The optical damage resistance of Hf (6 mol%): Er : LiNbO 3 crystals is about two orders of magnitude higher than that in Hf : Er : LiNbO 3. The X-ray power diffraction, the ultraviolet-visible absorption spectra and the infrared absorption spectrum were measured and discussed in terms of the spectrometric characterization and the defect structure of crystals. The results showed that with mild co-doping with HfO 2, Er 3+ substitutes Nb 5+, whereas with heavy co-doping, a part of Er 3+ substitutes Li +. The structure defects were discussed in this paper to explain the improvement of the optical damage resistance in the Hf : Er : LiNbO 3.

scholarly journals Linear Tuning of Phase-Matching Temperature in LiNbO3:Zr Crystals by MgO Co-Doping

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4155
Author(s):  
Tengfei Kong ◽  
Hongde Liu ◽  
Liyun Xue ◽  
Weiwei Wang ◽  
Shahzad Saeed ◽  
...  
Keyword(s):  
Room Temperature ◽  
Incident Angle ◽  
Phase Matching ◽  
Defect Structures ◽  
Defect Analysis ◽  
High Quality ◽  
Damage Resistance ◽  
Co Doping ◽  
532 Nm ◽  
Co Doped

We grew a series of co-doped LiNbO3 crystals with fixed 1.5 mol % ZrO2 and various MgO concentrations (1.0, 3.0, 4.0, 6.0 mol %), and investigated their optical properties and defect structures. By 3.0 mol % MgO co-doping, the optical damage resistance at 532 nm reached 6.5 × 106 W/cm2, while the phase-matching temperature for doubling 1064 nm was only 29.3 °C—close to room temperature—which was conducive to realizing the 90° phase matching at room temperature by slightly modulating the incident angle of the fundamental beam. Notably, we found that the phase-matching temperature increased linearly with the increase of MgO doping, and this linear dependence helped us to grow the high-quality crystal for room temperature 90° phase matching. Moreover, the defect analysis indicated that the linear tuning of phase-matching temperature might be attributed to Mg Li + + Zr Nb − neutral pairs in crystals.

Influence of magnesium concentration on the optical properties of ytterbium and holmium co-doped lithium niobate crystal

2016 ◽  
Vol 30 (01) ◽  
pp. 1550260 ◽  
Author(s):  
Li Dai ◽  
Shanshan Jiao ◽  
Zhehua Yan ◽  
Ping Dai ◽  
Gang Lui ◽  
...  
Keyword(s):  
Doping Concentration ◽  
Lithium Niobate Crystal ◽  
Threshold Concentration ◽  
Magnesium Concentration ◽  
Optical Homogeneity ◽  
Czochralski Technique ◽  
Infrared Transmission ◽  
Damage Resistance ◽  
Normal Lattice ◽  
Fundamental Reason

In this paper, a series of Yb (0.5[Formula: see text]mol.%):Ho (0.5[Formula: see text]mol.%):LiNbO3 crystals doped with various concentration of Mg[Formula: see text] (1, 3, 5 and 7[Formula: see text]mol.%) were grown by the Czochralski technique. The ability of optical damage resistance of Mg:Yb:Ho:LiNbO3 crystals increases with increasing the Mg[Formula: see text] doping concentration. The optical homogeneity of Mg:Yb:Ho:LiNbO3 crystals doped with different concentration of Mg[Formula: see text] was detected using the birefringence gradient method. The results demonstrated that the optical homogeneity is getting better with the increase of the Mg[Formula: see text] doping concentration. The studies on the infrared transmission spectra indicated that Mg[Formula: see text] ions first replaces anti-site Nb[Formula: see text] in the form of Mg[Formula: see text] defect, once the concentration of Mg[Formula: see text] reaches or exceeds the threshold concentration, it begins to substitute Li-site and Nb-site of normal lattice and form defect of Mg[Formula: see text][Formula: see text]3Mg[Formula: see text]. Therefore, the change of Mg[Formula: see text] doping concentration is the fundamental reason leading to a violet shift of the OH[Formula: see text] absorption peak.

Growth and optical damage resistance of Sc, Er Co-doped LiNbO3 crystals

2005 ◽  
Vol 40 (7) ◽  
pp. 649-653 ◽  
Author(s):  
X. H. Zhen ◽  
Q. Li ◽  
H. T. Li ◽  
Y. H. Xu ◽  
L. C. Zhao
Keyword(s):  
Damage Resistance ◽  
Optical Damage ◽  
Co Doped

The optical damage resistance and absorption spectra of LiNbO3:Hf crystals

2006 ◽  
Vol 18 (13) ◽  
pp. 3527-3534 ◽  
Author(s):  
Shuqi Li ◽  
Shiguo Liu ◽  
Yongfa Kong ◽  
Dongling Deng ◽  
Guangyu Gao ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Damage Resistance ◽  
Optical Damage

Effect of Zn and Fe Concentrations on Structure and Optical Damage Resistances of Near Stoichiometric Zn:Fe:LiNbO3 Crystals

2005 ◽  
Vol 475-479 ◽  
pp. 1677-1680
Author(s):  
Hong Tao Li ◽  
Zhi Jie Sun ◽  
Shaojian Ye ◽  
Wei Cai ◽  
Lian Cheng Zhao
Keyword(s):  
High Resistance ◽  
Doping Concentration ◽  
Solution Growth ◽  
Linbo3 Crystal ◽  
Damage Resistance ◽  
Optical Damage ◽  
Zn Concentration ◽  
Top Seeded Solution Growth ◽  
Stoichiometric Linbo3 Crystal ◽  
Co Doped

Zn,Fe co-doped near stoichiometric LiNbO3 crystals with variant Zn concentrations and with same Fe concentrations were grown by top-seeded-solution-growth (TSSG) method. The optical damage resistances of SLN crystals were studied by the method of transmittance facula distortion. The UV-Vis spectra showed that the grown undoping crystal had a composition very close to stoichiometric LiNbO3 crystal, and the absorption edges moved as the doping concentration changed. The optical damage experiments showed that, the crystal with 2mol% of Zn was with high resistance to optical damage, and the optical damage resistance was improved evidently as the Zn concentration increased further.

Structural, optical and thermal properties of Zr–Fe co-doped congruent LiNbO3single crystals

2013 ◽  
Vol 46 (3) ◽  
pp. 601-609 ◽  
Author(s):  
B. Riscob ◽  
R. Bhatt ◽  
N. Vijayan ◽  
Indranil Bhaumik ◽  
S. Ganesamoorthy ◽  
...  
Keyword(s):  
Dopant Concentration ◽  
Lattice Parameter ◽  
Dopant Distribution ◽  
Czochralski Technique ◽  
X Ray Diffraction ◽  
Crystalline Perfection ◽  
X Ray ◽  
Prism Coupler ◽  
532 Nm ◽  
Co Doped

Zr–Fe-doped congruent lithium niobate single crystals were grown by the Czochralski technique. The crystal structure and lattice parameter of the grown crystals were assessed by powder X-ray diffraction and the strain developed as a result of doping has been calculated (−1.19 × 10−3) by using the Williamson–Hall relation. The incorporated dopant concentration along with the dopant distribution in the specimen crystal was estimated by X-ray florescence spectrometry. A multi-crystal X-ray diffraction analysis was carried out to identify the crystalline perfection of the sample and revealed that the investigated crystal does not contain any structural grain boundaries but does contain point defects and micrometre size mosaic blocks. Birefringence measurements were carried out using a prism coupler spectrometer and found that the optical birefringence is 0.0822 for 532 nm and 0.705 for 1064 nm. A thermal conductivity (κ) study reveals that the doped sample has a lower κ value than the undoped equivalent.

scholarly journals The simultaneous enhancement of photorefraction and optical damage resistance in MgO and Bi2O3 co-doped LiNbO3 crystals

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Dahuai Zheng ◽  
Yongfa Kong ◽  
Shiguo Liu ◽  
Muling Chen ◽  
Shaolin Chen ◽  
...  
Keyword(s):  
Damage Resistance ◽  
Optical Damage ◽  
Co Doped

scholarly journals Enhanced Ultraviolet Damage Resistance in Magnesium Doped Lithium Niobate Crystals through Zirconium Co-Doping

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1017
Author(s):  
Tengfei Kong ◽  
Yi Luo ◽  
Weiwei Wang ◽  
Hanxiao Kong ◽  
Zhiqin Fan ◽  
...  
Keyword(s):  
First Principles ◽  
Ultraviolet Region ◽  
First Principles Calculations ◽  
Damage Resistance ◽  
Optical Damage ◽  
Co Doping ◽  
Excellent Candidate ◽  
Ultraviolet Damage ◽  
Lithium Niobate Crystals ◽  
Co Doped

MgO-doped LiNbO3 (LN:Mg) is famous for its high resistance to optical damage, but this phenomenon only occurs in visible and infrared regions, and its photorefraction is not decreased but enhanced in ultraviolet region. Here we investigated a series of ZrO2 co-doped LN:Mg (LN:Mg,Zr) regarding their ultraviolet photorefractive properties. The optical damage resistance experiment indicated that the resistance against ultraviolet damage of LN:Mg was significantly enhanced with increased ZrO2 doping concentration. Moreover, first-principles calculations manifested that the enhancement of ultraviolet damage resistance for LN:Mg,Zr was mainly determined by both the increased band gap and the reduced ultraviolet photorefractive center O2−/−. So, LN:Mg,Zr crystals would become an excellent candidate for ultraviolet nonlinear optical material.

Sign in / Sign up

Export Citation Format

Share Document