scholarly journals Widely Tunable Angular Non-Critical Phase-Matching Wavelengths from 0.72 to 1.42 μm Based on RE1xRE21−xCOB Mixed Crystals

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 744
Author(s):  
Ranran Li ◽  
Hongwei Qi ◽  
Yanqing Liu ◽  
Fapeng Yu ◽  
Pingzhang Yu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Frequency Conversion ◽  
Second Harmonic ◽  
Theoretical Calculations ◽  
Mixed Crystals ◽  
Phase Matching ◽  
Rare Earth Ion ◽  
Ti:Sapphire Lasers ◽  
High Efficient ◽  
Critical Phase

The angular non-critical phase-matching (A-NCPM) second-harmonic-generation (SHG) properties of RE1xRE21−xCOB (RE1, RE2 = Y, Gd, La, Tm, Sm, and Nd) type mixed crystals including NCPM wavelength and conversion efficiency were detailedly investigated. Theoretical calculations manifest that the A-NCPM SHG scope of these crystals is 0.72~1.42 µm, and in experiments, the A-NCPM SHG waveband of 0.72~1.25 µm has been realized, by changing the ratio of the rare-earth elements RE1 and RE2 in RE1xRE21−xCOB crystals. Comparing to the temperature-dependent A-NCPM SHG of 0.95~1.34 µm in LiB3O5 (LBO) crystal, the composition-dependent A-NCPM SHG of 0.72~0.95 µm in RE1xRE21−xCOB type crystals is unique and has special significance for the frequency conversion of Ti:Sapphire lasers. Relationships between the birefringence and radius of rare-earth ion RE3+ in RE1xRE21−xCOB mixed crystals were discussed. Aiming for the A-NCPM SHG of 0.72~1.42 µm, we supply a clear, completed, and optimized solution on how to select the compositions of RE1xRE21−xCOB mixed crystals. Under focusing light beam conditions, high efficient A-NCPM SHG for both OPO and Ti:sapphire lasers were realized experimentally by using long Y- and Z-cut RE1xRE21−xCOB crystal samples.

scholarly journals Angular non-critical phase-matching second-harmonic-generation characteristics of RECOB (RE = Tm, Y, Gd, Sm, Nd and La) crystals

2017 ◽  
Vol 25 (10) ◽  
pp. 11867 ◽  
Author(s):  
Yanqing Liu ◽  
Zhengping Wang ◽  
Fapeng Yu ◽  
Hongwei Qi ◽  
Xiuqin Yang ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Phase Matching ◽  
Critical Phase

Electronic Structure and Derived Linear and Nonlinear Optical Properties of Chalcopyrites

1999 ◽  
Vol 607 ◽  
Author(s):  
Walter R. L. Lambrecht ◽  
Sergey N. Rashkeev ◽  
Sukit Limpijumnong ◽  
Benjamin Segall
Keyword(s):  
Second Harmonic ◽  
Phase Matching ◽  
Orbital Method ◽  
Band Structures ◽  
Electronic Band ◽  
Critical Phase ◽  
Linear And Nonlinear ◽  
Interesting Compound ◽  
Indirect Band Gap ◽  
Electronic Band Structures

AbstractThe electronic band structures were calculated for a number of chalcopyrites in both the II-IV-V2 and I-III-VI2 families using the linear muffin-tin orbital method. From these band structures, the second harmonic generation coefficients were calculated using a recently developed methodology in which a separation is made of inter- and intraband contributions. We found that the high value of d36 in CdGeAs2 is in large part due to the fact, that in this material, unlike in the other chalcopyrites, almost no compensation occurs between inter- and intraband contributions, the former one being unusually small. For the case of ZnGeP2, a detailed investigation of the band structure, reveals that it has an indirect band gap rather than a pseudodirect one. The implications of this for the interpretation of the optical spectra are discussed. Finally, for the I-III-VI2 materials, we find that the Te based materials have far higher d36 than the selenides. Combined with their potential for non-critical phase matching, this makes AgGaTe2 an interesting compound.

Experimental analysis of overall thermal properties of Nd:La2CaB10O19crystals

2012 ◽  
Vol 45 (6) ◽  
pp. 1182-1186 ◽  
Author(s):  
Jianxiu Zhang ◽  
Yang Wu ◽  
Guochun Zhang ◽  
Yin Li ◽  
Yicheng Wu
Keyword(s):  
Thermal Expansion ◽  
Rare Earth ◽  
Frequency Conversion ◽  
Frequency Doubling ◽  
Nonlinear Frequency ◽  
Rare Earth Ion ◽  
Nonlinear Frequency Conversion ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients ◽  
Measured Specific Heat

Pure or rare-earth-ion-doped La2CaB10O19(LCB) is a promising optical material for nonlinear frequency conversion, laser and self-frequency doubling applications. In this paper, the thermophysical properties of Nd3+-doped LCB (Nd:LCB) crystals were measured and compared with those of pure and of Yb3+- and Er3+-doped LCB, as well as other borate nonlinear optical crystals. The melting points of rare-earth-doped LCB crystals are lower than that of pure LCB. Thermal expansion coefficients along thea,b,c,c*,a*, 〈110〉 and 〈110〉* directions have been measured, and the principal expansion coefficients were calculated to be 1.85 × 10−6, 4.13 × 10−6and 8.79 × 10−6 K−1. The measured specific heat of Nd:LCB is lower than that of pure LCB, resulting in a larger internal temperature gradient under irradiation by a pulsed laser beam. The measured thermal expansion anisotropy of Nd:LCB is stronger than that of pure LCB. The thermal conductivities of Nd:LCB along thecandc* directions are smaller than those along other crystallographic directions.

Growth and non-critical phase-matching frequency conversion properties of LaxY1−xCOB crystals

CrystEngComm ◽  
2016 ◽  
Vol 18 (33) ◽  
pp. 6205-6212 ◽  
Author(s):  
Hongwei Qi ◽  
Fang Wang ◽  
Xiangxu Chai ◽  
Zhengping Wang ◽  
Fapeng Yu ◽  
...  
Keyword(s):  
Frequency Conversion ◽  
Phase Matching ◽  
Critical Phase

Rb7SrY2(B5O10)3: A Rare-Earth Pentaborate with Moderate Second-Harmonic Response and Interesting Phase-Matching Behavior

2019 ◽  
Vol 58 (14) ◽  
pp. 8943-8947 ◽  
Author(s):  
Yunfei Li ◽  
Fei Liang ◽  
Huimin Song ◽  
Wang Liu ◽  
Zheshuai Lin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Second Harmonic ◽  
Phase Matching ◽  
Harmonic Response

Frequency Doubling and Polarization Coupling Using Birefringence-Phase-Matching and Quasi-Phase-Matching Simultaneously in Single Optical Superlattice

2012 ◽  
Vol 529 ◽  
pp. 81-86 ◽  
Author(s):  
Dong Huang ◽  
Yu Qing Wang ◽  
Jian Yi Luo
Keyword(s):  
Electric Field ◽  
Harmonic Generation ◽  
Frequency Conversion ◽  
Second Harmonic ◽  
Frequency Doubling ◽  
Phase Matching ◽  
Fundamental Wave ◽  
Optical Superlattice ◽  
Quasi Phase Matching ◽  
Dc Electric Field

We proposed a method to simultaneously implement birefringence-phase-matching (BPM) and quasi-phase-matching (QPM) second harmonic generation (SHG) and polarization coupling including six mismatches of wave vectors, in general case, in an optical superlattice (OSL). And the numerical simulations of SHG and polarization coupling in the OSL are carried out. The results indicate that unlike those of SHG processes with only one second harmonic (SH) reported, when one e-polarized fundamental pump is injected into the OSL, another o-polarized fundamental wave, an o-polarized and an e-polarized SHs can be simultaneously generated. The magnitudes of the o-polarized fundamental wave and SHs can be manipulated by an external dc electric field, which is useful when frequency conversion and signal tuning are required simultaneously.

scholarly journals Расчет эффективности удвоения частоты излучения субтерагерцового гиротрона за счет решеточной нелинейности в монокристаллической пластине InP

2021 ◽  
Vol 55 (10) ◽  
pp. 855
Author(s):  
В.В. Румянцев ◽  
А.П. Фокин ◽  
А.А. Дубинов ◽  
С.С. Морозов ◽  
А.А. Богдашов ◽  
...  
Keyword(s):  
Nuclear Polarization ◽  
Frequency Conversion ◽  
Second Harmonic ◽  
Frequency Doubling ◽  
Fine Tuning ◽  
Phase Matching ◽  
Polarization Spectroscopy ◽  
Noticeable Increase ◽  
Metal Waveguide ◽  
Selection Of

In this work, we calculated the efficiency of second harmonic generation for sub-THz gyrotron radiation in a single-crystal InP plate embedded in a conical metal waveguide. For the values of the losses at the doubled frequency (depending on the degree of purity of the InP crystal), the dimensions of the wafer are revealed that provide the optimal effective frequency conversion. Thus, the conversion factor f –>2f can reach 5 W/kW^2 when pumped at a frequency of 263 GHz and a loss of alpha_2f = 0.1 cm^-1. The possibility of a noticeable increase in the efficiency of frequency doubling with fine tuning of the phase matching due to the selection of the size of the submicron gap between the InP plate and the plates of the metal waveguide is shown. The results obtained can be used to solve applied problems in the field of dynamic nuclear polarization spectroscopy and nuclear magnetic resonance studies.

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