Article
Optics
Linpeng Yu, Jinhui Liang, Qinghui Zeng, Jiacheng Wang, Xing Luo, Jinzhang Wang, Peiguang Yan, Fanlong Dong, Xing Liu, Qitao Lue, Chunyu Guo, Shuangchen Ruan
Summary: A high-power femtosecond mid-infrared laser system composed of a single-mode Er:ZBLAN fiber mode-locked oscillator and pre-amplifier followed by a large-mode-area Er:ZBLAN fiber main amplifier is reported. The main amplifier is actively cooled and bidirectionally pumped at 976 nm, achieving a slope efficiency of 26.9%. Pulses of 8.12 W, 148 fs at 2.8 μm with a repetition rate of 69.65 MHz are obtained, which is the highest average power ever achieved from a femtosecond MIR laser source. Such a compact ultrafast laser system holds great promise for various applications, including medical surgery and material processing.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2023)
Article
Optics
Michael L. Buttolph, Pavel Sidorenko, Chris B. Schaffer, Frank W. Wise
Summary: We demonstrate an optical parametric chirped-pulse amplifier (OPCPA) using birefringence phase matching in a step-index single-mode optical fiber. The use of chirped pulses for pumping allows for the compression of the signal and idler pulses to durations below 30 fs.
Article
Engineering, Biomedical
Yanshu Guo, Yaoyu Li, Zhaoyang Weng, Hanjun Jiang, Zhihua Wang
Summary: This paper presents a sub-1GHz transmitter integrated chip designed for in-body bio-sensing applications. The chip features ultra-low power consumption and moderately high adjacent channel power rejection (ACPR). With the use of a 16QAM modulation scheme, a 400 MHz 12-phase digital power amplifier is implemented to improve energy efficiency. The chip also includes a 900 MHz FSK TX for low accuracy mode and a fully digital modulator for ACPR performance improvement. Fabricated in a 65-om CMOS process, the chip demonstrates energy efficiency comparable to state-of-the-art low power designs, with improved ACPR.
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
(2022)
Article
Optics
Haizhe Zhong, Chengchuan Liang, Shengying Dai, Jiefeng Huang, Saisai Hu, Changwen Xu, Liejia Qian
Summary: This paper presents a high-gain optical parametric amplifier for radially polarized femtosecond pulses, demonstrating >1000-fold amplification and maintaining axially symmetric intensity profile and radial polarization state within a 20 nm spectral range. The amplification scheme shows promise for creating radially polarized femtosecond pulses with ultrahigh powers, potentially advancing applications in strong-field physics.
Article
Physics, Multidisciplinary
SaiSai Hu, JieFeng Huang, XinHao Ren, ChangWen Xu, ShiXiang Xu, DianYuan Fan, HaiZhe Zhong
Summary: This article introduces a new method to generate ultrafast radially polarized pulses, which have strong longitudinal fields. This method provides a promising approach for wider applications in the future.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Optics
Xiaoya Ma, Jun Ye, Yang Zhang, Jiangming Xu, Liangjin Huang, Jinyong Leng, Zhiyong Pan, Pu Zhou
Summary: This study investigates the effects of output coupler reflectivity, length of phosphosilicate fiber, and pump bandwidth on high-power fiber lasers, demonstrating a low quantum defect Raman fiber laser with high power and efficiency. The findings offer a potential alternative scheme for high-power, high-efficiency fiber lasers and the suppression of thermal-induced effects.
Article
Mathematics
Peipei Pan, Aixi Chen, Li Deng
Summary: We investigate the cooling phenomenon of a mechanical oscillator in a double-coupled cavity optomechanical system. Our results show that the cooling of the mechanical oscillator can be significantly improved in the presence of optical parameter amplification and adjustment of optical cavity parameters. Our cooling solutions have potential applications for the preparation of nonclassical states of mechanical oscillators, high-precision measurements, and quantum information processing.
Article
Optics
Lixin Yuan, Yu Cai, Yuxi Chu, Jintao Fan, Minglie Hu
Summary: This article reports the experimental generation of few-cycle pulses at a 53 MHz repetition rate. Femtosecond pulses with a duration of 181 fs are first generated from an optical parametric oscillator (OPO). Then, the pulses are compressed using a hybrid compressor composed of a commercial single-mode fiber and a pair of prisms. The compressed optical pulses have an ultrabroadband spectrum and excellent long-term stability.
CHINESE OPTICS LETTERS
(2022)
Article
Environmental Sciences
Lifang Du, Haoran Zheng, Chunlei Xiao, Xuewu Cheng, Fang Wu, Jing Jiao, Yuchang Xun, Zhishan Chen, Jiqin Wang, Guotao Yang
Summary: We report an all-solid-state narrowband lidar system for simultaneous detection of Ca and Ca+ layers over Yanqing. The system's transmitter, based on OPO and OPA techniques, generates coherent light for detection of thermospheric and ionospheric Ca+ and Ca layers with higher power and stability compared to conventional dye-based systems. The lidar system demonstrated high sensitivity and reached a height of approximately 300 km.
Article
Physics, Multidisciplinary
Jinfang Yang, Chong Wang, Weijun Ling, Jingwen Xue, Xiaojuan Du, Wenting Wang, Yuxiang Zhao, Feiping Lu, Xiangbing Li, Jiajun Song, Zhaohua Wang, Zhiyi Wei
Summary: We present a high-power, widely tunable femtosecond MgO-doped periodically poled lithium niobate (MgO:PPLN) optical parametric oscillator (OPO) pumped by a Kerr-lens mode-locked Yb:KGW laser at a repetition rate of 151 MHz. The OPO can deliver up to 2.2 W of signal output centered around 1500 nm with a tunable signal spectrum range of 1377 nm-1730 nm, achieving an extraction efficiency of 31.4%. It exhibits excellent passive power stability of better than 0.71% rms over 4 hours. The idler tuning ranges from 2539 nm to 4191 nm, with a maximum idler bandwidth of 185 nm at 3613 nm. The shortest pulse duration of the signal is achieved at 170 fs at 1428 nm by compensating intracavity dispersion.
Article
Instruments & Instrumentation
Haolin Yang, Sailing He
Summary: Here, a high power dissipative soliton (DS) laser with a central wavelength of -1612 nm is proposed for applications in biomedical research and material processing. The study observes the automatic evolution of the DS pulses into noise-like (NL) pulses under high pumping strength, and achieves an output power of over 2W through the optimization of the amplifier system.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Georgia Paraskaki, Sven Ackermann, Bart Faatz, Gianluca Geloni, Tino Lang, Fabian Pannek, Lucas Schaper, Johann Zemella
Summary: Current FEL development efforts are focused on improving coherence control at high repetition rates while maintaining wavelength tunability. Introducing optical cavities to seed electron bunches and modulate their energy is a unique approach discussed to enhance FEL brightness and statistical data collection.
APPLIED SCIENCES-BASEL
(2021)
Article
Computer Science, Information Systems
S. Ali Hosseini Asl, Reza E. Rad, Arash Hejazi, YoungGun Pu, Kang-Yoon Lee
Summary: This paper presents a low-power and energy-efficient relaxation oscillator with a frequency of 64 MHz and a power consumption of 2.15 mu W/MHz. The oscillator employs only one comparator and one capacitor to generate the output clock, reducing power consumption compared to conventional structures. An auxiliary comparator is used to achieve a 50% +/- 5% duty cycle for the output clock. The relaxation oscillator utilizes an external low-dropout (LDO) voltage and bandgap reference (BGR) for the required supply and reference voltages.
Article
Optics
Mikhail Roiz, Markku Vainio
Summary: This study proposes and demonstrates a versatile method for near- and mid-infrared optical frequency comb generation using multi-seeded femtosecond optical parametric generation, showing flexibility and adjustability.
Review
Chemistry, Analytical
Hui Tang, Changjin Yang, Li Qin, Lei Liang, Yuxin Lei, Peng Jia, Yongyi Chen, Yubing Wang, Yue Song, Cheng Qiu, Chuantao Zheng, Xin Li, Dabing Li, Lijun Wang
Summary: The 1550 nm band semiconductor optical amplifier (SOA) has great potential in optical communication and LiDAR applications. With the development of quantum-well (QW) and quantum-dot (QD) material systems, SOAs have overcome polarization sensitivity and high noise, and have improved noise characteristics and transmission loss. Special waveguide structures and design have increased the saturation output power of SOAs. This study focuses on improving the performance of high-power SOAs in the 1550 nm band and summarizes the development trends and prospects.
Article
Chemistry, Multidisciplinary
Steffen Both, Martin Schaeferling, Florian Sterl, Egor A. Muljarov, Harald Giessen, Thomas Weiss
Summary: Nanophotonic chiral sensing, which exploits the strong light-matter interaction in nanophotonic resonators, has gained significant attention for its potential applications in life science and chemistry. However, a comprehensive understanding of the underlying interactions is still lacking. In this study, we present a general theory that describes chiral light-matter interactions in arbitrary resonators, providing deep insights for customization and enhancement of such interactions. Our theory efficiently predicts spectra and identifies two dominant contributions: chirality-induced resonance shift and changes in excitation and emission efficiencies of the resonator modes.
Article
Optics
Andrea Toulouse, Johannes Drozella, Pascal Motzfeld, Nils Fahrbach, Valese Aslani, Simon Thiele, Harald Giessen, Alois M. Herkommer
Summary: This research introduces the concepts, correction methods, and realizations of freeform multi-aperture wide-angle cameras fabricated by femtosecond direct laser writing (fsDLW). By splitting the field of view (FOV) into multiple apertures and using special lens shapes and catadioptric elements, a flat-form factor 180 degrees x 360 degrees camera can be created in the micrometer range. The study also presents methods for measuring and correcting freeform surfaces using confocal measurements and iterative fabrication via fsDLW. Additionally, approaches for digital distortion correction and image stitching are demonstrated, and two realizations of freeform multi-aperture wide-angle cameras are presented.
Article
Optics
Moritz Floess, Tobias Steinle, Ilja Gerhardt, Harald Giessen
Summary: This study presents a femtosecond tunable light source with a variable pulse repetition rate based on a synchronously pumped fiber-feedback optical parametric oscillator (FFOPO). The FFOPO system allows for pulse picking with extraordinarily high values up to 111 dB suppression of adjacent pulses and exceeds 130 dB in temporal contrast ratio, generating fs-pulses with tunable wavelength.
Article
Optics
Aashutosh Kumar, Asa Asadollahbaik, Jeongmo Kim, Khalid Lahlil, Simon Thiele, Alois M. Herkommer, Sile Nic Chormaic, Jongwook Kim, Thierry Gacoin, Harald Giessen, Jochen Fick
Summary: In this study, NaYF4:Eu nanorods with high aspect ratios were successfully manipulated and optically trapped using dual fiber optical tweezers, with a focus on trapping efficiency, alignment, cluster trapping, motion coupling, and emission characteristics. The europium emission was studied through polarization-resolved spectroscopy, determining the orientation of different emission lines with respect to the nanorod axes. The findings suggest that nanorod orientation can be determined by spectroscopic means.
PHOTONICS RESEARCH
(2022)
Article
Optics
Lucas Bremer, Carlos Jimenez, Simon Thiele, Ksenia Weber, Tobias Huber, Sven Rodt, Alois Herkommer, Sven Burger, Sven Hoefling, Harald Giessen, Stephan Reitzenstein
Summary: We conducted extended numerical studies to optimize the photon extraction and fiber-coupling efficiency of nanoscale quantum dot single-photon sources, achieving an overall photon coupling efficiency of up to 83%. Our work provides objective comparability for different fiber-coupled single-photon sources and proposes optimized geometries for practical and highly efficient quantum dot single-photon sources.
Article
Optics
Abdullah Alabbadi, Tobias Steinle, Harald Giessen
Summary: We present a compact and passively stable optical parametric oscillator that can directly generate sub-40 fs pulses, five times shorter than the 200 fs pump oscillator. By utilizing an intracavity all normal dispersion feedback fiber, we have achieved low-noise and coherent broadening beyond the bandwidth limitation of the parametric gain. The demonstrated spectral coverage ranges from 1.1 to 2.0 μm with excellent passive power and spectral stability below 0.1% rms, all in a compact footprint smaller than 14x14 cm(2).
Article
Chemistry, Multidisciplinary
Jiawen Li, Simon Thiele, Rodney W. Kirk, Bryden C. Quirk, Ayla Hoogendoorn, Yung Chih Chen, Karlheinz Peter, Stephen J. Nicholls, Johan W. Verjans, Peter J. Psaltis, Christina Bursill, Alois M. Herkommer, Harald Giessen, Robert A. McLaughlin
Summary: Multimodal microendoscopes enable simultaneous structural and molecular measurements in vivo, providing valuable insights into pathological changes associated with diseases. However, different optical imaging modalities have conflicting requirements for lens design, posing a challenge for the fabrication of miniaturized imaging probes. This study demonstrates an optical design using two-photon 3D printing to create a miniaturized lens that is optimized for both fluorescence and optical coherence tomography (OCT) imaging. The lens-in-lens design shows significant improvement in fluorescence sensitivity compared to conventional fiber-optic design approaches, and is successfully integrated into an intravascular catheter probe for simultaneous OCT and fluorescence imaging of a mouse artery in vivo.
Article
Materials Science, Multidisciplinary
Simon Ristok, Philipp Flad, Harald Giessen
Summary: 3D printing of micro-optics is a powerful method for fabricating sub-millimeter sized optics. By utilizing conformal low-temperature thermal atomic layer deposition, we are able to overcome the limitation of coating individual lenses in 3D printed optical systems. Our 4-layer design reduces the reflectivity of coated substrates in the visible range to below 1%. We find that the reflectivity is significantly reduced and transmission is enhanced, which is particularly important for low-light applications.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Philipp Karl, Sandra Mennle, Monika Ubl, Mario Hentschel, Philipp Flad, Jing-Wei Yang, Tzu-Yu Peng, Yu-Jung Lu, Harald Giessen
Summary: The development of photon-based technologies such as quantum cryptography and quantum computing relies on high-fidelity and fast photodetectors capable of detecting single photons. Superconducting nanowire single photon detectors, utilizing the superconducting-to-normal conducting phase transition, offer a promising solution. Using resonant plasmonic perfect absorber effects, these detectors can achieve high efficiency, polarization-independent absorption at a specific wavelength. Additionally, the target wavelength can be easily adjusted by modifying the detector's geometry.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Chemistry, Multidisciplinary
Hongfeng Ma, Nicolas Dalloz, Amaury Habrard, Marc Sebban, Florian Sterl, Harald Giessen, Mathieu Hebert, Nathalie Destouches
Summary: This article explores the use of deep neural networks and laser processing technology to predict the optical properties of laser-induced plasmonic metasurfaces and achieve printing image multiplexing. The study validates the effectiveness of the deep learning approach and provides a simple mining algorithm for implementing multiplexing with multiple observation modes and colors. This research is important for optimizing laser processes in high-end applications such as security, entertainment, or data storage.
Article
Optics
Julian Schwab, Ksenia Weber, Johannes Drozella, Carlos Jimenez, Alois Herkommer, Lucas Bremer, Stephan Reitzenstein, Harald Giessen
Summary: This study discusses the coupling efficiency of single-photon sources into single-mode fibers using 3D printed micro-optical lens designs. It optimizes lens systems for two different quantum light sources and evaluates the results in terms of maximum coupling efficiencies, misalignment effects, and thermo-optical influences.
Article
Chemistry, Analytical
Diana Pfezer, Julian Karst, Mario Hentschel, Harald Giessen
Summary: The detection and quantification of glucose in human blood or ocular fluid is crucial for diabetes patients. In this study, plasmonic nanoantennas and PCA were used to enhance the detection of glucose and other saccharides in complex aqueous environments. The results showed that the sensor achieved reliable detection and discrimination of saccharide concentrations down to physiological levels, which will greatly improve the detection of biomolecules in different complex environments.
Article
Quantum Science & Technology
Pavel Ruchka, Sina Hammer, Marian Rockenhauser, Ralf Albrecht, Johannes Drozella, Simon Thiele, Harald Giessen, Tim Langen
Summary: This paper introduces a new trapping concept for ultracold atoms in optical tweezers using micrometer-scale lenses 3D printed onto the tip of standard optical fibers. These lenses have unique properties that make them suitable for both trapping individual atoms and capturing their fluorescence with high efficiency. The vacuum compatibility and robustness of the structures were tested in an exploratory experiment and a magneto-optical trap for ultracold atoms was successfully formed, showing promise for portable atomic quantum devices.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Johannes Drozella, Andrea Toulouse, Pascal Motzfeld, Nils Fahrbach, Valese Aslani, Simon Thiele, Alois M. Herkommer, Harald Giessen
Summary: Modern two-photon-polymerization 3D printing technology allows for the creation of complex freeform optical surfaces with high control and accuracy. However, there may still be some systematic deviation due to volumetric changes during the polymerization and development process. This paper presents a method to include repeatable measurements and shape correction during the production process of monolithically created complex freeform lens systems. An example of its application for creating low profile multi-aperture large field of view objectives is also provided.
LASER-BASED MICRO- AND NANOPROCESSING XVI
(2022)
Article
Nanoscience & Nanotechnology
Pascal Dreher, David Janoschka, Alexander Neuhaus, Bettina Frank, Harald Giessen, Michael Horn-von Hoegen, Frank-J Meyer Zu Heringdorf
Summary: This study utilizes spectroscopic photoemission microscopy to detect and quantify the energy shift of electrons emitted from a surface plasmon polariton focus. The field strength of the surface plasmon polariton was determined without free parameters based on the shift of electron peaks as function of laser power.
