Article
Biochemistry & Molecular Biology
Lei Guo, Yaling Yang, Ruihua Wang, Baitao Zhang, Tao Li, Shengzhi Zhao, Jingliang He, Kejian Yang
Summary: This study presents the characteristics of a diode-end-pumped, high-repetition-rate, acoustic-optic (AO) Q-switched Tm:YLF laser operating from 5 kHz to 10 kHz. The experiment achieved a maximum average output power of 8.5 watts in the continuous-wave mode, with a slope efficiency of 30.7%. In the AO Q-switching mode, a maximum output power of 7.32 watts was obtained at a repetition frequency of 5 kHz, with a pulse width of 68 ns and a pulse energy of 1.4 mJ, corresponding to a peak power of 21.5 kW.
Article
Instruments & Instrumentation
Jingjing Liu, Mengyu Zong, Dongzhou Wang, Zhen Zhang, Jie Liu, Liangbi Su
Summary: The diode-end-pumped Er:CaF2-SrF2 laser actively Q-switched by a TeO2 acousto-optic crystal was demonstrated for the first time, showing promising results for high peak power actively Q-switched lasers in the mid-infrared region.
INFRARED PHYSICS & TECHNOLOGY
(2021)
Article
Optics
Xiaofang Yang, Ting Zhao, Zhongqing Fang, Weibin Kong, Rugang Wang
Summary: This study reports on a hybrid Q-switched Tm:YAG ceramic laser emitting near 2um, utilizing an acousto-optic modulator and a Cr:ZnSe crystal. The results showed that stable laser pulses with narrow pulse durations and good laser beam quality could be achieved in the frequency range of 0.1-1 kHz.
Article
Instruments & Instrumentation
Quansheng Fu, Chao Niu, Jinge Liu, Ya Wen, Chunting Wu, Yuan Dong, Tongyu Dai
Summary: The theory and experiment of a Tm: YAG 2 µm double-pulse laser output based on the two-step signal of acousto-optic Q-switch is presented for the first time. A Q-switched Tm: YAG double-pulse laser is achieved with output energy of 3.6 mJ at 2014.16 nm and repetition rate of 100 Hz under a pump power of 10 W. The beam quality is characterized by M2x = 1.39 and M2y = 1.34, with pulse widths and interval between the two pulses specified.
INFRARED PHYSICS & TECHNOLOGY
(2021)
Review
Optics
Xuechun Chen, Nan Wang, Chaojian He, Xuechun Lin
Summary: This article reviews the development and research status of all-fiber actively Q-switched oscillators, introduces various active Q-switching technologies and Q-factor optical modulators in chronological order, and looks forward to future development.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Salman Noach, Rotem Nahear, Yehuda Vidal, Yehudit Garcia, Aharon J. Agranat
Summary: An active Q-switched Tm:YLF laser with a unique switching scheme utilizing a potassium lithium tantalate niobate crystal has been developed. This novel approach effectively reduces oscillation effects and allows for stable pulse output with shorter pulse durations and higher energy at different repetition rates. The laser system demonstrates improved performance in generating pulses at 5 kHz and 500 Hz repetition rates.
Article
Crystallography
Jie Liu, Yanmin Duan, Wenjie Mao, Xinxin Jin, Zhihong Li, Haiyong Zhu
Summary: In this study, the generation of a self-Raman vortex laser using acousto-optic modulation was achieved for the first time. Beam cleaning-up and pulse compression effects were observed, along with the successful creation of a Stokes field carrying a unitary topological charge. The vortex laser exhibited high peak power and short pulse width, making it suitable for various applications.
Article
Engineering, Electrical & Electronic
Qi Bian, Yong Bo, Jun-Wei Zuo, Qin-Jun Peng, Zu-Yan Xu
Summary: We demonstrated a high-peak-power acousto-optic Q-switched Nd:YAG laser emitting at 1338 nm, achieving single wavelength operation by using a birefringence filter and obtaining high average output power, peak power and optical conversion efficiency.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Optics
Hongyang Wang, Zhiyan Zhang, Haijun Yu, Shusen Zhao, Zhiyong Dong, Kaixuan Cao, Zhe Liu, Xuechun Lin
Summary: A gain control method for acousto-optic Q-switched lasers is proposed, allowing conversion from single-pulse mode to double-pulse mode with adjustable subpulse intervals and energy ratios. The method effectively reduces peak energy density and avoids damage to optical fiber. The theoretical model of the double-pulse laser is established and experimentally verified. The double-pulse laser can achieve adjustable energy ratios, subpulse intervals from 500 ns to 20 μs, and a power output of 127 W at 5 kHz. Laser paint removal experiments show that the double-pulse laser has the same cleaning ability as the single-pulse laser while largely avoiding damage to the optical fiber.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Christopher J. Sarabalis, Raphael Van Laer, Rishi N. Patel, Yanni D. Dahmani, Wentao Jiang, Felix M. Mayor, Amir H. Safavi-Naeini
Summary: Acousto-optic modulators have long been important tools for controlling light since the advent of lasers. Recent advances in on-chip lithium niobate waveguide technology have opened up new opportunities for these devices. Demonstrating a collinear acousto-optic modulator in a suspended film of lithium niobate with a high-confinement, wavelength-scale waveguide significantly improves the modulator's efficiency.
Article
Optics
Gang Zhang, Kang Cheng, Zhiyong Jiao, Dailin Li, Xiaoyan Zhou, Xianfeng Xu, Tao Wang, Peng Liu
Summary: The study introduces a doubly Q-switched and mode-locked laser at 1.3 μm using an acousto-optic modulator and molybdenum selenide saturable absorber, which achieves stable QML pulses with a repetition rate of 1 kHz. It demonstrates a pulse energy of 550 μJ and a Q-switched envelope width of 155 ns at 12 W, showing a 92% reduction in envelope width and a 33-fold increase in pulse energy compared to the singly QML state.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Multidisciplinary
Xinyue Lei, Christoph Wieschendorf, Lu Hao, Josiah Firth, Leonardo Silvestri, Simon Gross, Francois Ladouceur, Michael Withford, David Spence, Alex Fuerbach
Summary: A novel approach utilizing a deformed helix ferroelectric liquid crystal cell for active Q-switching in an integrated waveguide chip laser is presented. The device can be directly integrated onto the Ytterbium-doped waveguide chip and controlled by an electrical signal. Experimental results show Q-switched lasers can be triggered with pulse durations as short as 38 ns and a maximum slope efficiency of 22% at repetition rates ranging from 0.1 kHz to 20 kHz.
Article
Optics
Wensheng Zhang, Qiong Gao, Sheng Zhou, Linjun Li, Xinzhi Ma
Summary: This paper demonstrates a diode-pumped acousto-optical Q-switched Ho:GTO laser with achieved maximum output power and pulse energy at different repetition rates, and calculated the corresponding peak power. Additionally, the authors estimated the beam quality factors of the laser.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Yonggui Zhang, Zhen Zhou, Honghao Ma, Shuang Liang, Haotian Feng, Changkun Feng, Hongchen Jiao, Lishuang Feng
Summary: This paper proposes a scheme using HOPLL technology to suppress backscattering noise in resonant fiber optic gyroscopes (RFOG), by using AOM for frequency shifting and phase locking. The accuracy of RFOG is improved by this scheme.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Physics, Applied
Hengjun Chen, Weichao Yao, Hiyori Uehara, Ryo Yasuhara
Summary: In this work, an actively Q-switched Tb:LiYF4 laser emitting green light at 544 nm was developed for the first time. The laser achieved an average power of 445 mW at a repetition rate of up to 16 kHz with varying output transmittance levels, demonstrating high pulse peak power and energy.
APPLIED PHYSICS EXPRESS
(2021)
Article
Materials Science, Ceramics
Gabriele Frigenti, Daniele Farnesi, Xavier Rosello-Mecho, Andrea Barucci, Fulvio Ratto, Martina Delgado-Pinar, Miguel Andres, Gualtiero Nunzi Conti, Silvia Soria
Summary: This paper reviews the rich and complex phenomenological scenario in Whispering Gallery Mode (WGM) hollow microcavities when pumped with a continuous-wave laser source. The coexistence of nonlinear and optomechanical effects, such as stimulated Brillouin and Raman scattering and Kerr effects, have been investigated. It is found that these effects occur simultaneously with parametric optomechanical oscillations caused by radiation pressure. The study also shows the regenerative oscillation of acoustic eigenmodes leading to parametric instabilities and the activation of optomechanical chaotic oscillations. Additionally, it is demonstrated that the blue-side excitation of WGM resonances leads to chaos transition with a spectral evolution dependent on the cavity size.
CERAMICS INTERNATIONAL
(2023)
Article
Optics
C. Cuadrado-Laborde, J. L. Cruz, A. Diez, M. V. Andres
Summary: We discuss a method to determine the group delay and phase of a given pulse in the Fourier optics domain. The proposal involves measuring two intensity spectra before and after a known quadratic phase modulation. An analytical equation is then used to determine the group delay in one step, with the option to determine the spectral phase through spectral integration if needed. The proposal is supported by numerical results and experimental measurement.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
David Castello-Lurbe, Christians Cuadrado-Laborde, Enrique Silvestre, Antonio Diez, Miguel V. Andres
Summary: Accurate knowledge of the nonlinear coefficient is crucial for reliable predictions of optical pulses in waveguides. However, determining this parameter under conditions where dispersion, loss, and nonlinear effects are equally important remains a challenge. This study develops and demonstrates a general method for measuring the nonlinear coefficient of waveguides under such demanding conditions, using a kilometer-long standard silica fiber pumped at a wavelength close to 2 μm.
Review
Chemistry, Analytical
Luis A. Sanchez, Antonio Diez, Jose Luis Cruz, Miguel Andres
Summary: In-fiber opto-mechanics based on forward Brillouin scattering allows sensing the surrounding environment of the optical fiber. The technique utilizes transverse acoustic resonances and a pump and probe technique assisted by a fiber grating for the development of efficient point sensors. Accurate measurements of acoustic velocities and properties of the fiber have been achieved with high precision, reducing relative errors compared to previous methods. Discriminative measurements of strain and temperature can be performed with a single-point sensor, demonstrating the potential for wavelength-multiplexed point sensors.
Article
Chemistry, Multidisciplinary
Christian Cuadrado-Laborde, Jose L. Cruz, Antonio Diez, Miguel V. Andres
Summary: In this study, the performance difference of two thulium-doped fiber lasers pumped at 1561 nm was compared. It was found that the laser operating at 1.951 μm had a pulse repetition rate of 15.6 MHz and a pulse duration of 81 ps, while the laser operating at 2.07 μm had a pulse repetition rate of 13.1 MHz and a pulse duration of 94 ps. The long-term stability of the setup and its performance in a simulated harsh environment were also tested, confirming the superior performance of fiber laser systems with a fully polarization-maintaining design.
APPLIED SCIENCES-BASEL
(2023)
Article
Mathematics, Interdisciplinary Applications
Lucas P. Tendela, Christian A. Cuadrado-Laborde, Miguel V. Andres
Summary: This work demonstrates numerically that an asymmetric Moire fiber grating operated in reflection can achieve the required spectral response for an all-optical fractional differentiator. Unlike fiber Bragg gratings and long-period gratings with punctual defects, the accumulated phase shift in our proposed device is distributed throughout the grating instead of being associated with a point phase shift. Numerical simulations support the validity of the proposed device, and a dimensionless deviation factor is calculated to facilitate quantitative analysis. The performance of the device is evaluated through numerical simulations and compared with theoretical differentiation.
FRACTAL AND FRACTIONAL
(2023)
Article
Engineering, Electrical & Electronic
Carolina Maria Londero, Martina Delgado-Pinar, Christian Cuadrado-Laborde, Miguel V. V. Andres
Summary: This paper introduces a robust and easy-to-fabricate U-shaped fiber sensor based on singlemode telecom fiber, which is applied to biosensing. The resonant nature of the sensing mechanism allows for a large dynamic range of refractive index (RI) variations without the ambiguity seen in other techniques like interferometry. The performance of the U-shaped fiber sensor was studied for different bending radii, optimizing sensitivity and detection limit at 1550 nm operation wavelength, as well as investigating the effect of temperature on response. The shift of the resonant wavelength was measured as a function of external RI within the range of 1.33-1.37, and the detection limit was determined to be (2.88 ± 0.03) × 10(-5) RIU. Furthermore, the device was successfully tested as a proof of concept biosensor using a system model antigen-antibody (BSA-aBSA).
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Luis A. Sanchez, Martina Delgado-Pinar, Antonio Diez, Miguel V. Andres
Summary: Opto-mechanical interactions in different photonic platforms have attracted great attention, and recent studies have achieved exciting results. This study presents a novel approach to detect and characterize opto-excited transverse acoustic mode resonances (TAMRs) in optical fibers, using optical surface wave resonances and optical whispering-gallery mode (WGM) resonances. The study demonstrates the use of WGMs for probing TAMRs in optical fibers, achieving the narrowest linewidths ever reported and optimum efficiency for low-order TAMR detection.
ADVANCED OPTICAL MATERIALS
(2023)
