Article
Physics, Multidisciplinary
Renhong Gao, Haisu Zhang, Fang Bo, Wei Fang, Zhenzhong Hao, Ni Yao, Jintian Lin, Jianglin Guan, Li Deng, Min Wang, Lingling Qiao, Ya Cheng
Summary: The study has broken through the bottleneck of lithium niobate on insulator microresonator Q factors, achieving ultra-high Q factors and leading to a variety of nonlinear optical phenomena such as OPO and harmonics generation, with features like ultra-low pump threshold, high conversion efficiency, and ultra-wide operation bandwidth.
NEW JOURNAL OF PHYSICS
(2021)
Review
Optics
Milad Gholipour Vazimali, Sasan Fathpour
Summary: Photonics on thin-film lithium niobate (TFLN) is a highly sought-after discipline in integrated optics, offering ultracompact and low-loss optical waveguides and devices. It has revitalized the traditional and commercial applications of lithium niobate for optical modulators and wavelength converters, while also providing opportunities for various other applications such as optical amplification and oscillation, nonlinear effects, optical frequency comb generation, and quantum optics.
ADVANCED PHOTONICS
(2022)
Article
Multidisciplinary Sciences
Luis Ledezma, Arkadev Roy, Luis Costa, Ryoto Sekine, Robert Gray, Qiushi Guo, Rajveer Nehra, Ryan M. Briggs, Alireza Marandi
Summary: Widely tunable coherent sources are desirable in nanophotonics for various applications. This study presents ultrawidely tunable optical parametric oscillators in dispersion-engineered periodically poled lithium niobate nanophotonics. By using 100 ns pulses near 1 mu m, the output wavelengths can be tuned from 1.53 mu m to 3.25 mu m, which represents the first octave-spanning tunable source in nanophotonics extending into the mid-infrared.
Article
Multidisciplinary Sciences
Chengying Bao, Zhiquan Yuan, Lue Wu, Myoung-Gyun Suh, Heming Wang, Qiang Lin, Kerry J. Vahala
Summary: The authors present a microcomb-based dual-comb spectroscopy sensor with GHz resolution for mid-infrared gas sensing. The system stability is determined by a single high-Q microresonator, making it simplified and eliminating the need for external frequency locking. The methane and ethane spectra can be measured over short intervals as 0.5 ms, showing potential for chip-based architectures in mid-IR gas sensors for various applications.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Mingxiao Li, Lin Chang, Lue Wu, Jeremy Staffa, Jingwei Ling, Usman A. Javid, Shixin Xue, Yang He, Raymond Lopez-rios, Theodore J. Morin, Heming Wang, Boqiang Shen, Siwei Zeng, Lin Zhu, Kerry J. Vahala, John E. Bowers, Qiang Lin
Summary: On-chip integration of laser systems has led to significant developments in various applications such as LIDAR and AR/VR. In this study, the authors achieved fast on-chip configurability of a narrow linewidth laser by utilizing the Pockels effect in an integrated semiconductor platform. The integrated laser demonstrated record-high frequency modulation speed and fast switching capability, as well as the ability to co-lase at infrared and visible frequencies, making it a promising solution for applications in LiDAR, microwave photonics, atomic physics, and AR/VR.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Clemens Singer, Alexander Goetz, Adarsh S. Prasad, Martin Becker, Manfred Rothhardt, Sarah M. Skoff
Summary: This study demonstrates the thermal tuning capability of an alignment-free, fiber-integrated Fabry-Perot cavity, which can function as a narrowband filter with wavelength tuning and high suppression performance. Additionally, in the field of quantum optics, quantum emitters can be coupled to the cavity for reversible manipulation of cavity effects.
Article
Optics
Luyao Wang, Ilya Shadrivov
Summary: This study numerically investigates metasurfaces incorporating electro-optic materials and demonstrates their ability to achieve large amplitude and phase modulations over a fraction of the operation wavelength. The study shows that metasurfaces composed of dielectric discs on a lithium niobate film exhibit three types of resonances, namely, Fabry-Perot modes, guided modes, and Mie modes. By comparing the performance of metasurfaces in different regimes, the study finds that the strongest amplitude modulation can be achieved by exciting and re-emitting the guided modes in the substrate. Furthermore, the study reveals that for larger phase modulation while maintaining high transmission, more complex metasurfaces with at least two resonators per unit cell are required.
Article
Optics
Botao Fu, Renhong Gao, Jintian Lin, Ni Yao, Haisu Zhang, Min Wang, Lingling Qiao, Wei Fang, Ya Cheng
Summary: This study reveals an effective and controllable mode trimming and clustering mechanism in microresonators, leading to the generation of polygon and star modes. Various modes are observed in sequence within a single microresonator by tuning the excitation wavelength or varying the coupling position.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Qiang Luo, Chen Yang, Zhenzhong Hao, Ru Zhang, Dahuai Zheng, Fang Bo, Yongfa Kong, Guoquan Zhang, Jingjun Xu
Summary: This study reports the fabrication of on-chip erbium-doped LNOI waveguide amplifiers based on electron beam lithography and inductively coupled plasma reactive ion etching, achieving a net internal gain of 30 dB/cm. This development may promote the advancement of LNOI integrated photonics.
CHINESE OPTICS LETTERS
(2021)
Article
Chemistry, Analytical
Jianhao Zhang, Rongbo Wu, Min Wang, Youting Liang, Junxia Zhou, Miao Wu, Zhiwei Fang, Wei Chu, Ya Cheng
Summary: This article demonstrates the hybrid integration of a lithium niobate microring resonator with a silicon nitride waveguide in a vertical configuration to achieve efficient light coupling. By using specific fabrication processes, the microring resonator is fabricated on a LNOI substrate with a fused silica cladding layer, and the silicon nitride waveguide is produced on top of the cladding layer. The device achieves Q-factors as high as 1.4 x 10(7) with the vertically integrated structure.
Article
Physics, Multidisciplinary
Bo-Yu Xu, Li-Kun Chen, Jin-Tian Lin, Lan-Tian Feng, Rui Niu, Zhi-Yuan Zhou, Ren-Hong Gao, Chun-Hua Dong, Guang-Can Guo, Qi-Huang Gong, Ya Cheng, Yun-Feng Xiao, Xi-Feng Ren
Summary: The research team successfully demonstrated a bright and broadband biphoton quantum source with spectral multiplexing on a chip, which is important for scalable and complex integrated quantum networks.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Optics
Baolong Zhang, Zhenzhe Ma, Jinglong Ma, Xiaojun Wu, Chen Ouyang, Deyin Kong, Tianshu Hong, Xuan Wang, Peidi Yang, Liming Chen, Yutong Li, Jie Zhang
Summary: By cooling the crystals, tailoring the pump laser spectra, chirping the pump pulses, and magnifying the laser energies, researchers successfully achieved 1.4-mJ THz pulses in lithium niobates with an energy conversion efficiency of 0.7%. The high-energy THz source is suitable for electron acceleration and extreme THz science.
LASER & PHOTONICS REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
Sina Saravi, Thomas Pertsch, Frank Setzpfandt
Summary: Lithium niobate is one of the most suitable material platforms for integrated optical quantum circuits, with recent advancements in nanostructuring technology. The LNOI platform, with its advanced nanostructuring technology and favorable material properties, has the potential to be a strong contender for large-scale optical quantum circuits.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Optics
Zhenzhong Hao, Li Zhang, Jie Wang, Fang Bo, Feng Gao, Guoquan Zhang, Jingjun Xu
Summary: Lithium-niobate microcavities have excellent nonlinear optical properties and can resonantly enhance light-matter interaction. This study observed multi-peak spectra in the near infrared range in lithium-niobate microcavities, which were attributed to the sum-frequency of the pump laser and its background. The conversion efficiencies of the sum-frequency processes were found to be 61.5% W-1, and their influences on nonlinear processes were discussed.
CHINESE OPTICS LETTERS
(2022)
Article
Optics
Nina Amelie Lange, Jan Philipp Hoepker, Raimund Ricken, Viktor Quiring, Christof Eigner, Christine Silberhorn, Tim J. Bartley
Summary: In this study, researchers demonstrate that spontaneous parametric down-conversion (SPDC) in nonlinear waveguides is fully compatible with the cryogenic operating conditions required for superconducting detectors. By comparing the performance indicators at low temperature and room temperature, they investigate the effect of low temperature on the SPDC process.
Article
Optics
Renhong Gao, Ni Yao, Jianglin Guan, Li Deng, Jintian Lin, Min Wang, Lingling Qiao, Wei Fang, Ya Cheng
Summary: We demonstrate integrated lithium niobate (LN) microring resonators with high Q factors close to the material absorption limit. The microrings are fabricated on thin LN film wafers using chemo-mechanical etching, resulting in ultra-smooth interfaces and no ion-induced lattice damage. The microrings exhibit an ultralow waveguide propagation loss, enabling applications in integrated quantum light source, frequency comb generation, and nonlinear optical processes.
CHINESE OPTICS LETTERS
(2022)
Article
Optics
Yiran Zhu, Yuan Zhou, Zhe Wang, Zhiwei Fang, Zhaoxiang Liu, Wei Chen, Min Wang, Haisu Zhang, Ya Cheng
Summary: We have reported an electro-optically tunable microdisk laser fabricated on Er3+-doped lithium niobate on insulator (LNOI) substrate. By applying a variable voltage on a pair of integrated Cr microelectrodes near the LNOI microdisk, electro-optic modulation with an effective resonance-frequency tuning rate of 2.6 GHz/100 V has been achieved, resulting in a tuning range of 45 pm when the electric voltage is varied between -200 V and 200 V.
CHINESE OPTICS LETTERS
(2022)
Review
Physics, Applied
Min Wang, Zhiwei Fang, Jintian Lin, Rongbo Wu, Jinming Chen, Zhaoxiang Liu, Haisu Zhang, Lingling Qiao, Ya Cheng
Summary: We have fabricated integrated active lithium niobate (LN) photonic devices using the photolithography-assisted chemo-mechanical etching (PLACE) technique. These devices include waveguide amplifiers, tunable lasers, and microring lasers. They have a wide range of applications in light-wave communication, precision sensing, and quantum information science.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Optics
Y. U. Ma, J. U. N. X. I. A. Zhou, Z. H. I. W. E. I. Fang, Y. U. A. N. Zhou, T. I. N. G. Huang, Y. I. R. A. N. Zhu, Z. H. E. Wang, J. I. A. N. Liu, Z. H. A. O. X. I. A. N. G. Liu, R. O. N. G. B. O. Wu, M. I. N. Wang, HAIsU Zhang, Y. A. Cheng
Summary: We demonstrate an on-chip microring laser on Yb3+-doped thin film lithium niobate (Yb:TFLN) fabricated by photolithography-assisted chemo-mechanical etching technology. Multiwavelength laser emissions around 1025 nm from the microring resonator pumped by a 980 nm laser diode are observed with the lasing threshold of 10 mW. Up to 14 longitudinal modes are obtained from the fabricated Yb:TFLN microring laser experimentally, indicating its potential as a light source for multiple wavelength channels in optical communications and biosensors.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Optics
Renhong Gao, Botao Fu, Ni Yao, Jianglin Guan, Haisu Zhang, Jintian Lin, Chuntao Li, Min Wang, Lingling Qiao, Ya Cheng
Summary: Narrow-bandwidth dual-wavelength microlasers are generated for the first time using nearly-degenerate polygon modes in a high-Q active lithium niobate microdisk. The microlasers have independently controllable resonant wavelengths and low threshold, leading to stable dual-wavelength laser generation with low noise. The measured microwave signal shows a phase noise of -123 dBc Hz(-1) and an electro-optic tuning efficiency of -1.66 MHz V-1, with a linewidth of 6.87 kHz.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Yuan Zhou, Yiran Zhu, Zhiwei Fang, Shupeng Yu, Ting Huang, Junxia Zhou, Rongbo Wu, Jian Liu, Yu Ma, Zhe Wang, Jianping Yu, Zhaoxiang Liu, Haisu Zhang, Zhenhua Wang, Min Wang, Ya Cheng
Summary: This work presents a robust low-loss optical interface for passive/active lithium niobate photonics by tiling passive and active thin film lithium niobate (TFLN) substrates. The tiled substrates allow for patterning the integrated device's mask using a single continuous photolithography process. The interface loss of the tiled substrate is measured to be as low as 0.26 dB. A four-channel waveguide amplifier with net gains of 5 dB and 8 dB at 1550 nm and 1530 nm wavelengths, respectively, is achieved through this approach. The robust low-loss optical interface facilitates the development of large-scale high-performance photonic devices with on-chip light sources and amplifiers.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Jie LI, Mengyue Shi, Yong Wu, Zhiwei Fang, Jiajin Wang, Huan Mu, Weisheng Hu, Lilin Yi
Summary: We propose a novel driving scheme using external high-order phase modulation to suppress stimulated Brillouin scattering (SBS) in master oscillator power amplification (MOPA) systems. A chirp-like signal is designed by further processing a piecewise parabolic signal, which can uniformly broaden the SBS gain spectrum with a high threshold. The SBS threshold is theoretically modeled based on the three-wave coupling equation, and experimental validation in a watt-class amplifier demonstrates significant improvement in SBS suppression compared to traditional spectra.
Article
Optics
Shupeng Yu, Zhiwei Fang, Zhe Wang, Yuan Zhou, Qinfen Huang, Jian Liu, Rongbo Wu, Haisu Zhang, Min Wang, Ya Cheng
Summary: We demonstrate an on-chip single-mode Er3+-doped thin-film lithium niobate (Er:TFLN) laser with a Fabry-Perot resonator based on Sagnac loop reflectors. The fabricated laser has a footprint of 6.5 mm x 1.5 mm, a loaded quality (Q) factor of 1.6 x 10^5, and a free spectral range (FSR) of 63 pm. We achieve single-mode laser operation at 1544 nm wavelength with a maximum output power of 44.7 μW and a slope efficiency of 0.18%.
Article
Chemistry, Multidisciplinary
Ting Huang, Yu Ma, Zhiwei Fang, Junxia Zhou, Yuan Zhou, Zhe Wang, Jian Liu, Zhenhua Wang, Haisu Zhang, Min Wang, Jian Xu, Ya Cheng
Summary: In this study, a narrow linewidth 980 nm laser is demonstrated by injecting an electrically pumped distributed-feedback (DFB) laser diode into a high-quality lithium niobate (LN) microring resonator. The LN microring resonator is fabricated using the PLACE technique, achieving a high Q factor of 6.91 x 10(5). By coupling the multimode 980 nm laser diode with the high-Q LN microring resonator, the linewidth is narrowed down to 35 pm with a single-mode characteristic. The narrow-linewidth microlaser has an output power of about 4.27 mW and a wavelength tuning range of 2.57 nm. This research explores the potential applications of a hybrid integrated narrow linewidth 980 nm laser in high-efficient pump lasers, optical tweezers, quantum information, chip-based precision spectroscopy, and metrology.
Article
Optics
Zhihao Zhang, Shanming Li, Renhong Gao, Haisu Zhang, Jintian Lin, Zhiwei Fang, Rongbo Wu, Min Wang, Zhenhua Wang, Yin Hang, Ya Cheng
Summary: In this work, a photonic integrated waveguide amplifier fabricated on erbium-ytterbium (Er-Yb) codoped thin-film lithium nio-bate (TFLN) is investigated. A small-signal internal net gain of 27 dB is achieved at a signal wavelength of 1532 nm in the fabricated Er-Yb TFLN waveguide amplifier pumped by a diode laser at 980 nm. Experimental characterizations demonstrate the suitability of waveguide fabrication by the photolithography-assisted chemo-mechanical etching (PLACE) technique and the gain in an Yb-sensitized-Er material. The demonstrated high-gain chip-scale TFLN amplifier is promising for interfacing with established lithium niobate integrated devices, greatly extending the spectrum of TFLN photonic applications.
Proceedings Paper
Optics
Jintian Lin, Renhong Gao, Botao Fu, Ni Yao, Jianglin Guan, Ya Cheng
Summary: This study successfully fabricated high-Q erbium ion doped lithium niobate microcavities for single frequency lasing and achieved tunable single-mode microlasers with narrow linewidth. Additionally, low-phase-noise microwave signals were generated from dual-wavelength microlasers on single active LNOI microdisks, which resulted from the nearly degenerate polygon modes with spatial intensity distributions and a.-phase difference. The measured phase noise of the microwave signal was -123 dBc/Hz.
QUANTUM AND NONLINEAR OPTICS IX
(2022)
Article
Optics
Jiankun Hou, Jintian Lin, Jiefu Zhu, Guolin Zhao, Yao Chen, Fangxing Zhang, Yuanlin Zheng, Xianfeng Chen, Ya Cheng, Li Ge, Wenjie Wan
Summary: In this article, we experimentally demonstrate a self-induced transparency effect in a perfectly absorbing optical microcavity, where a portion of waves can be transmitted at higher power due to the nonlinear coupling between the fundamental and second harmonic modes. The asymmetric scattering nature of the microcavity enables chiral and unidirectional reflection, allowing for asymmetric and chiral coherent control of the perfect absorption states through phase varying. Moreover, chiral behaviors also empower the chiral emission of second-harmonic generation with a high distinct ratio in the transparency state.
Article
Optics
Jintian Lin, Saeed Farajollahi, Zhiwei Fang, Ni Yao, Renhong Gao, Jianglin Guan, Li Deng, Tao Lu, Min Wang, Haisu Zhang, Wei Fang, Lingling Qiao, Ya Cheng
Summary: In this study, single-frequency ultranarrow linewidth lasers were achieved on erbium ion-doped lithium niobate microdisks through excitation of high-Q polygon modes, resulting in a significantly reduced linewidth. Moreover, real-time electro-optical tuning of the microlasers was demonstrated using the strong linear electro-optic effect of LN.
ADVANCED PHOTONICS
(2022)
