Article
Materials Science, Multidisciplinary
Heng Tu, Shihui Ma, Zhanggui Hu, Nan Jiang, Yu Shen, Nan Zong, Jian Yi, Qilong Yuan, Xiaoyang Wang, Jiyang Wang
Summary: By adjusting the output transmittances, the internal heat accumulation can be slightly adjusted, improving the performance of high-power Raman yellow lasers.
Article
Chemistry, Physical
Bakhtiar Ali, Han Xu, Dashavir Chetty, Robert T. Sang, Igor Litvinyuk, Maksym Rybachuk
Summary: The degree of laser-induced graphitization in single crystal chemical vapor deposited diamond was studied. The sp(3) phase transitions to sp(2) aromatic crystalline graphitic fraction below a critical fluence, above which amorphous carbon is formed. The increase in fluence leads to a significant increase in the depth of graphitized areas and cleavage of C=O bonds.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Review
Optics
Yulan Li, Jie Ding, Zhenxu Bai, Xuezong Yang, Yuqi Li, Jingling Tang, Yu Zhang, Yaoyao Qi, Yulei Wang, Zhiwei Lu
Summary: Stimulated Raman-scattering-based lasers offer an effective method for achieving wavelength conversion, but thermal-induced beam degradation is a significant issue. Diamond is a promising candidate for Raman materials due to its excellent thermal properties and high Raman gain coefficient. A diamond Raman resonator designed as an external-cavity pumped structure can eliminate negative thermal effects and enhance beam quality.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2021)
Article
Optics
Jie Ding, Yulan Li, Hui Chen, Yunpeng Cai, Zhenxu Bai, Yaoyao Qi, Bingzheng Yan, Yulei Wang, Zhiwei Lu
Summary: In this work, we investigate the impact of thermal loading on the performance of an external cavity diamond Raman laser. A model is formulated to study the temperature, thermal stress, and thermal deformation in the diamond Raman medium. Experimental results show a DRL generating Stokes emission at 1240 nm with high output power and beam quality.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Crystallography
Hao Li, Wenxi Pei, Wei Huang, Meng Wang, Zefeng Wang
Summary: This study presents a high-power, highly efficient, wavelength-tunable nanosecond pulsed 1.7 mu m fiber laser based on hydrogen-filled hollow-core photonic crystal fibers (HC-PCFs) by rotational stimulated Raman scattering. Experimental results show a maximum average Stokes power of 3.3 W at 1705 nm with a slope efficiency of 84%, achieving the highest recorded value for 1.7 mu m pulsed fiber lasers.
Article
Optics
Shihui Ma, Heng Tu, Dazhi Lu, Zhanggui Hu, Nan Jiang, Xiaoyang Wang, Jiyang Wang
Summary: An efficient red emission at 620 nm from an artificial diamond crystal based on the second-order stokes design is achieved. Utilizing a microcavity with integrated coating design, the Raman red laser can achieve high average output power and control the output of multi-stokes laser. These results offer a potential route towards generating highly efficient Raman red laser and enriching the output waveband of red laser.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Zhenhua Shao, Xuanxi Li, Yajie Shen, Deyuan Shen, Heyuan Zhu
Summary: The study presents the tunable wavelength operation of a diamond Raman laser at around 2.5 μm when pumped by a narrow linewidth Q-switched Tm:YAP laser at 1.88 μm. The Raman laser achieved stable pulses with high peak power and a tunable output wavelength range from 2511.1 nm to 2522.1 nm.
LASER PHYSICS LETTERS
(2021)
Article
Optics
Shuanghong Ding, Xinxin Huang, Qiaoshuang Zou
Summary: The picosecond synchronously pumped solid-state Raman laser with diamond crystals as Raman media is theoretically studied in detail for the first time. The high efficient working point and effective pulse compression working point are investigated. The study finds that longer Raman crystal, shorter pumping pulse width, and higher pumping power can improve Raman conversion efficiency, while realizing pulse width compression and higher peak power.
APPLIED PHYSICS B-LASERS AND OPTICS
(2022)
Article
Materials Science, Multidisciplinary
Aizitiaili Abulikemu, Muneaki Hase
Summary: We present a direct generation of efficient and wavelength-tunable third-harmonic generation from ultrapure electronic-grade diamond crystals. The THG efficiency of approximately 0.7% at a wavelength of 427 nm can be achieved under an ultrafast infrared excitation at 1280 nm, and the THG signal can be tuned over a broad range from 420 to 730 nm. The high THG efficiency is attributed to the minimal absorption loss and phase-matching conditions in the electronic-grade diamond.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Materials Science, Ceramics
Nian Liu, Kentaro Sugimoto, Naoya Yoshitaka, Hideaki Yamada, Rongyan Sun, Kenta Arima, Kazuya Yamamura
Summary: A novel hybrid process combining nanosecond pulsed laser trimming and plasma-assisted polishing was proposed to flatten and smooth large-sized single-crystal diamond substrates. The process successfully reduced the roughness and improved the flatness of the diamond surface. Spectrophotometer and Raman results confirmed that no non-diamond phase was generated during the process.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Bo Yan, Yinwu Li, Weiwei Cao, Zhiping Zeng, Pu Liu, Zhuofeng Ke, Guowei Yang
Summary: A highly efficient and selective CO2 reduction method is developed using laser reduction in liquid, achieving high CO yield and energy conversion efficiency.
Article
Chemistry, Multidisciplinary
Andrey A. A. Khomich, Vitali Kononenko, Oleg Kudryavtsev, Evgeny Zavedeev, Alexander V. V. Khomich
Summary: The use of ultrafast pulses in laser processing, including on diamonds, is currently popular. The orientation of the irradiated crystal face has recently been found to be important for the diamond to graphite transition process. In this study, a Ti:sapphire laser was used to produce highly oriented graphite layers on the (111) surface of a diamond monocrystal, and the structure of the graphitized material was analyzed using confocal Raman spectroscopy. The results show a correlation between laser ablation regimes and sp(2) phase structure, and provide insight into the optimal laser fluence for producing perfect graphite spots on the diamond surface.
Article
Multidisciplinary Sciences
Alexander Savvin, Alexander Dormidonov, Evgeniya Smetanina, Vladimir Mitrokhin, Evgeniy Lipatov, Dmitriy Genin, Sergey Potanin, Alexander Yelisseyev, Viktor Vins
Summary: The authors successfully demonstrated lasing in (NV-) centers in diamond, achieving improved laser efficiency by fine-tuning the pump conditions to reduce photoionization. Investigation into lasing conditions and gain saturation was conducted under high-power laser pulse pumping of diamond crystal.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Zhanda Zhu, Shiwei Lv, Hanyi Zhang, Yongling Hui, Hong Lei, Qiang Li
Summary: A novel gain medium structure has been designed to achieve high efficiency Q-switched pulses with an optical-optical conversion efficiency of 30.5%, which is the highest reported for actively Q-switched Nd:YAG lasers at the hundred milli-joules level.
Article
Nanoscience & Nanotechnology
Wangyang Zhang, Weishan Yan, Haonian Zheng, Chaopeng Zhao, Duo Liu
Summary: This study demonstrates laser-engineered polydimethylsiloxane (PDMS) as a versatile and highly efficient platform for water manipulation. The obtained superhydrophobic PDMS material exhibits excellent stability and can be widely applied in areas such as oil/water separation and water collection.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Instruments & Instrumentation
Zhenxu Bai, Menghan Tian, Duo Jin, Wenqiang Fan, Yaoyao Qi, Jie Ding, Bingzheng Yan, Yi Wu, Yulei Wang, Zhiwei Lu, Richard P. Mildren
Summary: This study investigates the frequency stability characteristics of a laser system utilizing PDH frequency locking and two different frequency discrimination systems, and finds that F-P-based systems offer better performance. The advantages and limitations of both approaches are discussed.
INFRARED PHYSICS & TECHNOLOGY
(2022)
Article
Optics
Zhongan Zhao, Zhenxu Bai, Duo Jin, Yaoyao Qi, Jie Ding, Bingzheng Yan, Yulei Wang, Zhiwei Lu, Richard P. Mildren
Summary: In this paper, a calculation method for processing the output of a delayed self-heterodyne setup using a short length of delay fiber is presented to determine laser linewidth. The method avoids the introduction of 1/f noise and demonstrates high calculation accuracy and flexibility based on experimental results.
Article
Chemistry, Analytical
Zhongan Zhao, Zhenxu Bai, Duo Jin, Xiaojing Chen, Yaoyao Qi, Jie Ding, Bingzheng Yan, Yulei Wang, Zhiwei Lu, Richard P. Mildren
Summary: In this paper, a short fiber-based scheme for measuring narrow linewidth is proposed, and the influence of the noise floor on the measurement accuracy of this scheme is studied theoretically and experimentally. The results show that this solution can significantly improve the measurement accuracy of narrow linewidth.
Article
Physics, Applied
Zhenxu Bai, Zhongan Zhao, Xiaojing Chen, Yaoyao Qi, Jie Ding, Bingzheng Yan, Yulei Wang, Zhiwei Lu, Richard P. Mildren
Summary: We propose a narrow-linewidth demodulation method using short-fiber-delayed self-heterodyne structure and coherent envelope spectral properties to restore the Lorentzian line shape of the laser output, avoiding broadening caused by 1/f noise. Experimental results show that our scheme is effective and accurate, providing a feasible means of improving accuracy and computational efficiency of narrow linewidth measurements.
APPLIED PHYSICS EXPRESS
(2022)
Article
Physics, Applied
Yuxiang Sun, Muye Li, Richard Paul Mildren, Zhenxu Bai, Hongchao Zhang, Jian Lu, Yan Feng, Xuezong Yang
Summary: In this study, we demonstrate a continuous-wave single-frequency diamond Raman laser operating at 1178 nm using a linear resonator stabilized with an intracavity chi((2)) element. By optimizing the phase matching in the chi((2)) element, we achieved a maximum single-longitudinal-mode power of approximately 20 W with a linewidth of approximately 67 MHz. This work provides an interesting approach for generating single-frequency high-power lasers near 1.2 μm by combining diamond Raman conversion with broadband, high-power, and low-cost YDF lasers.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Yuxiang Sun, Muye Li, Ondrej Kitzler, Richard Paul Mildren, Zhenxu Bai, Hongchao Zhang, Jian Lu, Yan Feng, Xuezong Yang
Summary: We have demonstrated a highly efficient continuous-wave diamond Raman laser with enhanced stability at 1178 nm wavelength using a V-cavity design. By using a 1018 nm Yb-doped fiber pump laser, a maximum Stokes power of 39 W and conversion efficiency of 45% were achieved. The results are a significant step towards stable, efficient, and high-power continuous-wave lasers at 1178 nm and at wavelengths beyond the main Yb and Nd emission bands.
LASER PHYSICS LETTERS
(2022)
Article
Optics
Duo Jin, Zhenxu Bai, Zhiwei Lu, Rong Fan, ZhongAn Zhao, Xuezong Yang, Yulei Wang, Richard P. Mildren
Summary: This study reports a diamond Brillouin laser employing doubly resonant technology, achieving high Brillouin output power and narrow linewidth. By suppressing amplified spontaneous emission noise, this technology has the potential for realizing Brillouin oscillators with high power and kHz linewidths.
Article
Optics
Nathalie Vermeulen, Daniel Espinosa, Adam Ball, John Ballato, Philippe Boucaud, Georges Boudebs, Cecilia L. A. Campos, Peter Dragic, Anderson S. L. Gomes, Mikko J. Huttunen, Nathaniel Kinsey, Rich Mildren, Dragomir Neshev, Lazaro A. Padilha, Minhao Pu, Ray Secondo, Eiji Tokunaga, Dmitry Turchinovich, Jingshi Yan, Kresten Yvind, Ksenia Dolgaleva, Eric W. Van Stryland
Summary: Over the past two decades, the field of nonlinear optics has seen significant growth and advancements in material science and technology. This article presents a new set of data tables listing the nonlinear-optical properties of different material categories, along with best practices for conducting and reporting nonlinear-optical experiments. While the tables demonstrate strong progress, it is important for the nonlinear-optics community to adopt these best practices for better comparison, interpretation, and utilization of published parameters, thereby further stimulating the overall progress in the field.
JOURNAL OF PHYSICS-PHOTONICS
(2023)
Article
Optics
Duo Jin, Zhenxu Bai, Muye Li, Xuezong Yang, Yulei Wang, Richard P. Mildren, Zhiwei Lu
Summary: This paper presents a time-independent analytical model for describing the generation of first-order Stokes field in free-space Brillouin lasers. The model is validated through experimental simulations and is used to optimize the laser system design.
Article
Optics
Douglas J. Little, Richard L. Pahlavani, Richard P. Mildren
Summary: This study investigates the potential of diamond-based thermo-optic actuators in applications such as laser frequency control, which are considered too slow for bulk materials. Diamond's extremely fast thermal response times provide an opportunity to improve performance.
Article
Physics, Applied
Hui Chen, Zhenxu Bai, Yunpeng Cai, Xuezong Yang, Jie Ding, Yaoyao Qi, Bingzheng Yan, Yunfei Li, Yulei Wang, Zhiwei Lu, Richard P. Mildren
Summary: This article reports on the design and operation of a laser that produces wavelengths in the 1.2 and 1.5 μm ranges using stimulated Raman scattering and stimulated Brillouin scattering in diamond. By controlling the characteristics of the laser resonator around the diamond crystal, the researchers can selectively control the onset of each nonlinear process to customize the laser output in terms of wavelength and power. This work demonstrates the flexibility and power-handling capacity of diamond for converting common laser wavelengths and generating multiple discrete wavelengths.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Muye Li, Xuezong Yang, Yuxiang Sun, Huawei Jiang, Richard P. Mildren, Ondrej Kitzler, David J. Spence, Yan Feng
Summary: We investigated the suppression of secondary modes in single longitudinal mode (SLM) 1240 nm diamond Raman lasers. By using a three-mirror V-shape standing-wave cavity with an intra-cavity LBO crystal, we achieved stable SLM output with high power and efficiency. We found that secondary modes generated by stimulated Brillouin scattering (SBS) can be suppressed using an intracavity aperture.
Article
Physics, Applied
Duo Jin, Zhenxu Bai, Yifu Chen, Wenqiang Fan, Jun Ke, Yulei Wang, Zhiwei Lu, Richard P. P. Mildren
Summary: This study investigates the design of Free-space Brillouin lasers (BLs) for different media with the aim of achieving a high-power and narrow-linewidth output. By using large-size, wide-gain-bandwidth Brillouin media, it is possible to achieve the desired output. Experimental results demonstrate the successful implementation of a BL using fused silica and diamond, with the fused silica configuration achieving a narrower linewidth compared to the diamond BL. These design routes provide potential for generating high-power, ultra-narrow-linewidth laser radiation at specific wavelengths.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Duo Jin, Zhenxu Bai, Yifu Chen, Wenqiang Fan, Yulei Wang, Zhiwei Lu, Richard P. Mildren
Summary: This study reveals that the cascade operation of Brillouin lasers is a barrier to single-frequency power scaling and further compression of the fundamental linewidth. By selecting Brillouin gain media with high sound velocity, large refractive index, and narrow linewidth, the second Stokes can be suppressed, leading to cascade-free intramode scattering in diamond. This study elucidates a route to single-frequency, narrow-linewidth Brillouin lasers via Brillouin material selection.
Correction
Optics
Helen Zhijie Zeng, Minh Anh Phan Ngyuen, Xiaoyu Ai, Adam Bennet, Alexander S. Solntsev, Arne Laucht, Ali Al-Juboori, Milos Toth, Richard P. Mildren, Robert Malaney, Igor Aharonovich
