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Liu M, Gray RM, Roy A, Ledezma L, Marandi A. Optical-parametric-amplification-enhanced background-free spectroscopy. OPTICS LETTERS 2024; 49:2914-2917. [PMID: 38824291 DOI: 10.1364/ol.520848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Accepted: 04/18/2024] [Indexed: 06/03/2024]
Abstract
Traditional absorption spectroscopy has a fundamental difficulty in resolving small absorbance from a strong background due to the instability of laser sources. Existing background-free methods in broadband vibrational spectroscopy help to alleviate this problem but face challenges in realizing either low extinction ratios or time-resolved field measurements. Here, we introduce optical-parametric-amplification-enhanced background-free spectroscopy, in which the excitation background is first suppressed by an interferometer, and then the free-induction decay that carries molecular signatures is selectively amplified. We show that this method can improve the limit of detection in linear interferometry by order(s) of magnitude without requiring lower extinction ratios or a time-resolved measurement, which can benefit sensing applications in detecting trace species.
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Chen M, Wang C, Tian XH, Tang J, Gu X, Qian G, Jia K, Liu HY, Yan Z, Ye Z, Yin Z, Zhu SN, Xie Z. Wafer-Scale Periodic Poling of Thin-Film Lithium Niobate. MATERIALS (BASEL, SWITZERLAND) 2024; 17:1720. [PMID: 38673078 PMCID: PMC11051387 DOI: 10.3390/ma17081720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 04/01/2024] [Accepted: 04/04/2024] [Indexed: 04/28/2024]
Abstract
Periodically poled lithium niobate on insulator (PPLNOI) offers an admirably promising platform for the advancement of nonlinear photonic integrated circuits (PICs). In this context, domain inversion engineering emerges as a key process to achieve efficient nonlinear conversion. However, periodic poling processing of thin-film lithium niobate has only been realized on the chip level, which significantly limits its applications in large-scale nonlinear photonic systems that necessitate the integration of multiple nonlinear components on a single chip with uniform performances. Here, we demonstrate a wafer-scale periodic poling technique on a 4-inch LNOI wafer with high fidelity. The reversal lengths span from 0.5 to 10.17 mm, encompassing an area of ~1 cm2 with periods ranging from 4.38 to 5.51 μm. Efficient poling was achieved with a single manipulation, benefiting from the targeted grouped electrode pads and adaptable comb line widths in our experiment. As a result, domain inversion is ultimately implemented across the entire wafer with a 100% success rate and 98% high-quality rate on average, showcasing high throughput and stability, which is fundamentally scalable and highly cost-effective in contrast to traditional size-restricted chiplet-level poling. Our study holds significant promise to dramatically promote ultra-high performance to a broad spectrum of applications, including optical communications, photonic neural networks, and quantum photonics.
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Affiliation(s)
- Mengwen Chen
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, School of Physics, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China; (M.C.); (C.W.); (K.J.); (H.-Y.L.); (S.-N.Z.)
| | - Chenyu Wang
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, School of Physics, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China; (M.C.); (C.W.); (K.J.); (H.-Y.L.); (S.-N.Z.)
| | - Xiao-Hui Tian
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, School of Physics, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China; (M.C.); (C.W.); (K.J.); (H.-Y.L.); (S.-N.Z.)
| | - Jie Tang
- National Key Laboratory of Solid-State Microwave Devices and Circuits, Nanjing Electronic Devices Institute, Nanjing 210016, China; (J.T.); (X.G.); (G.Q.)
| | - Xiaowen Gu
- National Key Laboratory of Solid-State Microwave Devices and Circuits, Nanjing Electronic Devices Institute, Nanjing 210016, China; (J.T.); (X.G.); (G.Q.)
| | - Guang Qian
- National Key Laboratory of Solid-State Microwave Devices and Circuits, Nanjing Electronic Devices Institute, Nanjing 210016, China; (J.T.); (X.G.); (G.Q.)
| | - Kunpeng Jia
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, School of Physics, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China; (M.C.); (C.W.); (K.J.); (H.-Y.L.); (S.-N.Z.)
| | - Hua-Ying Liu
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, School of Physics, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China; (M.C.); (C.W.); (K.J.); (H.-Y.L.); (S.-N.Z.)
| | - Zhong Yan
- School of Integrated Circuits, Nanjing University of Information Science and Technology, Nanjing 210044, China;
- NanZhi Institute of Advanced Optoelectronic Integration Technology Co., Ltd., Nanjing 210018, China; (Z.Y.)
| | - Zhilin Ye
- NanZhi Institute of Advanced Optoelectronic Integration Technology Co., Ltd., Nanjing 210018, China; (Z.Y.)
| | - Zhijun Yin
- NanZhi Institute of Advanced Optoelectronic Integration Technology Co., Ltd., Nanjing 210018, China; (Z.Y.)
| | - Shi-Ning Zhu
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, School of Physics, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China; (M.C.); (C.W.); (K.J.); (H.-Y.L.); (S.-N.Z.)
| | - Zhenda Xie
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, School of Physics, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China; (M.C.); (C.W.); (K.J.); (H.-Y.L.); (S.-N.Z.)
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Tian H, Zhu R, Li R, Xing S, Schibli TR, Minoshima K. Broadband, high-power optical frequency combs covering visible to near-infrared spectral range. OPTICS LETTERS 2024; 49:538-541. [PMID: 38300053 DOI: 10.1364/ol.514182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Accepted: 12/21/2023] [Indexed: 02/02/2024]
Abstract
Optical frequency combs (OFCs) have become essential tools in a wide range of metrological and scientific research fields. However, in the reported literature, OFCs that cover the visible spectral range have a limited bandwidth and pulse energy. These drawbacks limit their potential applications, such as high-signal-to-noise ratio spectroscopic measurements. In this work, we demonstrate a broadband, high-power optical frequency comb covering the visible to near-infrared range (550 nm to 900 nm) with a high average power of approximately 300 mW. This is accomplished by the power scaling of optical pulses from a fully stabilized Er:fiber comb, coherent spectral broadening and finally the utilization of a PPLN's χ(2) nonlinearity. The broadband, high-power, fully stabilized visible OFCs showcased in this work offer reliable laser sources for high-precision spectroscopic measurements, imaging, and comparisons of optical clocks.
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