scholarly journals Broadband highly efficient nonlinear optical processes in on-chip integrated lithium niobate microdisk resonators of Q-factor above 108

2021 ◽  
Author(s):  
Renhong Gao ◽  
Haisu Zhang ◽  
Fang Bo ◽  
Wei Fang ◽  
Zhenzhong Hao ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Conversion Efficiency ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Nonlinear Coefficient ◽  
High Spectral Resolution ◽  
Parametric Oscillation ◽  
High Q ◽  
On Chip ◽  
Q Factors

Abstract Microresonators of ultrahigh quality (Q) factors represent a crucial type of photonic devices aiming at ultra-high spectral resolution, ultra-high sensitivity to the environmental perturbations, and efficient nonlinear wavelength conversions at low threshold pump powers. Lithium niobate on insulator (LNOI) microdisks of high Q factors are particularly attractive due to its large second-order nonlinear coefficient and strong electro-optic property. In this Letter, we break through the long standing bottleneck in achieving the Q factors of LNOI micro-resonators beyond 108, which approaches the intrinsic material absorption limit of lithium niobate (LN). The ultra-high Q factors give rise to a rich family of nonlinear optical phenomena from optical parametric oscillation (OPO) to harmonics generation with unprecedented characteristics including ultra-low pump threshold, high wavelength conversion efficiency, and ultra-broad operation bandwidth. Specifically, the threshold of OPO is measured to be only 19.6 μW, and the absolute conversion efficiency observed in the second harmonic generation reaches 23%. The record-breaking performances of the on-chip ultra-high Q LNOI microresonators will have profound implication for both photonic research and industry.

scholarly journals Fabrication of Crystalline Microresonators of High Quality Factors with a Controllable Wedge Angle on Lithium Niobate on Insulator

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1218 ◽  
Author(s):  
Jianhao Zhang ◽  
Zhiwei Fang ◽  
Jintian Lin ◽  
Junxia Zhou ◽  
Min Wang ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Femtosecond Laser ◽  
Wedge Angle ◽  
Quality Factors ◽  
High Quality ◽  
Surface Smoothness ◽  
High Q ◽  
Q Factors

We report the fabrication of crystalline microresonators of high quality (Q) factors with a controllable wedge angle on lithium niobate on insulator (LNOI). Our technique relies on a femtosecond laser assisted chemo-mechanical polish, which allows us to achieve ultrahigh surface smoothness as critically demanded by high Q microresonator applications. We show that by refining the polish parameters, Q factors as high as 4.7 × 107 can be obtained and the wedge angle of the LNOI can be continuously tuned from 9° to 51°.

ENHANCING CONVERSION EFFICIENCY IN THE SECOND-ORDER NONLINEAR OPTICAL PHENOMENA

2004 ◽  
Vol 13 (03n04) ◽  
pp. 445-449
Author(s):  
JONGBAE KIM ◽  
JUNG JIN JU ◽  
MIN-SU KIM
Keyword(s):  
Harmonic Generation ◽  
Conversion Efficiency ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Second Order ◽  
Phase Matching ◽  
Quasi Phase Matching ◽  
Optical Phenomena ◽  
Nonlinear Optical Phenomena ◽  
Second Order Nonlinearity

The distributions of electric field and the induced second-order nonlinearity are discussed in a poling scheme where the width of a periodic electrode is shorter than the conventional coherent length. The theoretical aspects of quasi-phase matching for a subsequent experiment in second harmonic generation are analyzed. The present analysis consistently explains that the conversion efficiency can be enhanced if the electrode width is shortened, and maximized if the electrode width is optimized.

Nonlinear Frequency Conversion Performance of AgGaSe2, ZnGeP2, and CdGeAs2

MRS Bulletin ◽  
1998 ◽  
Vol 23 (7) ◽  
pp. 45-49 ◽  
Author(s):  
P.G. Schunemann ◽  
K.L. Schepler ◽  
P.A. Budni
Keyword(s):  
Solid State ◽  
Nonlinear Optical ◽  
Frequency Conversion ◽  
Second Harmonic ◽  
Difference Frequency ◽  
Superior Performance ◽  
Parametric Oscillation ◽  
Nonlinear Frequency ◽  
Optical Parametric Oscillation ◽  
Laser Applications

In recent years, chalcopyrites have distinguished themselves as the nonlinear optical materials of choice for mid- to far-infrared (ir) laser applications. In particular, AgGaSe2, ZnGeP2, and CdGeAs2 have demonstrated the highest conversion efficiencies and output powers in the wavelength range beyond 4 μm. The superior performance of these crystals arises from their high nonlinear optical coefficients (39 pm/V, 75 pm/V, and 236 pm/V, respectively), their relatively large birefringence (sufficient for phase matching), and advances in crystal growth and processing that have improved transparency and eliminated cracking.The two most direct approaches to generating laser output in the mid-ir (in particular the 3–5-μm atmospheric transmission window) are (1) shifting the output of a solid-state laser to longer wavelengths via optical parametric oscillation (OPO), or (2) doubling the frequency of a CO2 laser (9–11 μm) via second-harmonic generation (SHG). The OPO approach offers the advantage of tunability combined with potentially more compact and efficient solid-state lasers, whereas the SHG approach benefits from the greater maturity of high-power CO2 laser technology. A third process, difference-frequency generation (DFG), is also a 3-wave interaction similar to OPO that can be used to mix two photons (from two lasers or from an OPO) to produce longer wavelength photons (corresponding to the small difference frequency) over a large spectral range. The optimum chalcopyrite crystal (AgGaSe2, ZnGeP2, or CdGeAs2) for a given approach depends on a complex combination of material parameters described in the sections that follow.

scholarly journals Calculation of nonlinear optical properties of lithium niobate crystals

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 72-76
Author(s):  
D. A. Vorobev ◽  
◽  
O. V. Sidorova ◽  
M. N. Palatnikov ◽  
A. V. Kadetova ◽  
...  
Keyword(s):  
Optical Properties ◽  
Lithium Niobate ◽  
Nonlinear Optical ◽  
Frequency Conversion ◽  
Lithium Niobate Crystal ◽  
Second Harmonic ◽  
Polar Axis ◽  
Nonlinear Optical Properties ◽  
Optical Effects ◽  
Lithium Niobate Crystals

The coefficients of the second-order nonlinear optical tensor for lithium niobate crystal with a composition close to stoichiometric were calculated. The calculated results show that the contribution of the Li-O group to the optical effects of the second harmonic was greater than the contribution of the Nb-O group. The results also showed that the most efficient frequency conversion occurred along the polar axis of the crystal

scholarly journals On-chip second-harmonic generation and broadband parametric down-conversion in a lithium niobate microresonator

2017 ◽  
Vol 25 (20) ◽  
pp. 24531 ◽  
Author(s):  
Rui Luo ◽  
Haowei Jiang ◽  
Steven Rogers ◽  
Hanxiao Liang ◽  
Yang He ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Parametric Down Conversion ◽  
On Chip ◽  
Down Conversion

scholarly journals Nonlinear optical oscillation dynamics in high-Q lithium niobate microresonators

2017 ◽  
Vol 25 (12) ◽  
pp. 13504 ◽  
Author(s):  
Xuan Sun ◽  
Hanxiao Liang ◽  
Rui Luo ◽  
Wei C. Jiang ◽  
Xi-Cheng Zhang ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Nonlinear Optical ◽  
High Q ◽  
Oscillation Dynamics
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