Article
Chemistry, Multidisciplinary
Maria Pawliszewska, Dorota Tomaszewska, Grzegorz Sobon, Anna Duzynska, Mariusz Zdrojek, Jaroslaw Sotor
Summary: This study demonstrates the potential of generating ultrashort laser pulses in the broadband spectral range using a saturable absorber based on free-standing metallic carbon nanotube thin film. The research also highlights the suitable performance of nanomaterial for ultrafast photonic applications.
APPLIED SCIENCES-BASEL
(2021)
Article
Optics
Xin Cheng, Zhiquan Lin, Xuezong Yang, Shuizhen Cui, Xin Zeng, Huawei Jiang, Yan Feng
Summary: This study investigates high-power continuous-wave single-frequency Er-doped fiber amplifiers at 1560 nm using in-band and core pumping of a 1480 nm Raman fiber laser. Both co- and counter-pumping configurations are experimentally studied. The co-pumped setup achieves output power up to 59.1 W and 90% efficiency in the fundamental mode and linear polarization, while the counter-pumped configuration yields less power and efficiency due to additional loss. The amplifier shows identical performance in terms of laser linewidth and relative intensity noise up to 10 MHz for both setups.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2023)
Article
Optics
Wei Wei, Gaolin Qin, Bing Li, Junfa Duan
Summary: A novel wavelength tunable laser based on a Sagnac loop incorporating PM-PCF technology was proposed and experimentally demonstrated. The laser showed good stability and high signal to noise ratio, with single-, dual- and triple-wavelength laser outputs achievable. The power and wavelength fluctuations were measured within 20 minutes, indicating stable performance.
Article
Optics
N. A. Koliada, V. S. Pivtsov, S. A. Kuznetsov, A. A. Filonov, S. A. Farnosov, I. M. Kolyada, D. Yu Primakov, A. S. Dychkov, D. S. Kharenko, I. S. Zhdanov
Summary: A stable erbium fiber-based femtosecond optical frequency comb locked to an Yb+ single-ion optical frequency standard was created using an extra-cavity acousto-optic frequency modulator and an intracavity electro-optic phase modulator. The instability introduced by the stabilization and measurement systems, in addition to the reference optical signal, was found to be within acceptable limits for different averaging times.
LASER PHYSICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Yongyao Xie, Zhenhua Cong, Zhigang Zhao, Xingyu Zhang, Xian Zhao, Wei Zhao, Xianbin Shao, Zhaojun Liu
Summary: YAG crystal-derived all-glass silica fibers (YDSFs) with different doping concentrations of Er3+ were prepared using the molten-core method, achieving the highest gain coefficient in the 1.5μm band. A 1.55μm pulsed single-frequency YDSF laser was demonstrated for the first time, delivering stable output power, slope efficiency, and single-pulse energy.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Instruments & Instrumentation
A. R. Muhammad, M. F. Rusdi, A. A. A. Jafry, A. M. Markom, Z. Jusoh, H. Haris, S. W. Harun, P. Yupapin
Summary: The paper introduces a new fiber-based saturable absorber using silver nanoparticles, achieving stable pulse train output of ultrafast pulses.
INFRARED PHYSICS & TECHNOLOGY
(2021)
Article
Optics
S. Cao, B. Lin, Y. Han, Z. Fang
Summary: This paper reports a narrow-linewidth Er-doped fiber optical frequency comb that can transmit narrow-linewidth optical frequencies from 698 nm to 1542 nm.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Alena Yu Kolesnikova, Sergey Suchkov, Ilya D. Vatnik
Summary: We study the nonlinear mode interaction in a cylindrical microresonator with nanoscale radius variation and demonstrate the generation of broadband stable low-repetition-rate frequency combs based on axial-azimuthal modes.
Article
Engineering, Electrical & Electronic
Xucheng Zhang, Zhixu Jia, Yali Huang, Jiliang Wu, Ting Wang, Yuxian Chen, Yongsen Yu, Yuede Yang, Jinlong Xiao, Weiping Qin, Yongzhen Huang, Guanshi Qin
Summary: In this paper, intra-cavity dispersion engineering is proposed to reshape the bright dissipative Kerr solitons in a Brillouin laser cavity with anomalous GVD for generating flat-top OFCs with a high conversion efficiency. By introducing a piece of optical fiber with normal GVD into the above Brillouin fiber laser cavity for making a hybrid fiber cavity with near zero net cavity GVD, the intra-cavity waveform is broadened in time-domain due to the existence of normal GVD, which conquers the pulse compression caused by four-wave mixing and anomalous GVD, and leads to the formation of bright dissipative Kerr solitons and OFCs with a flat-top profile and a high conversion efficiency, via interlocking of up-switching waves. Furthermore, flat-top OFCs with step tunable mode spacing from GHz to THz are achieved via intra-cavity dispersion engineering.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Xiao-Zhou Li, Mohamed Seghilani, Luis Romero Cortes, Jose Azana
Summary: The study demonstrates pulse repetition-rate multiplication of a low-rate commercial mode-locked laser source, showing its potential for generating optical frequency combs with ultra-broad frequency spacings. Through detailed experimental and numerical analysis, the method is found to be efficient in producing OFCs without the need for high-speed electronics, while offering important versatility.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Optics
Xinxing Liu, Wenhui Hao, Zhihui Yang, Yulong Tang
Summary: By adjusting the configuration of the laser, narrow pulses and high peak power can be achieved in random fiber lasers, and an over-one-octave visible-NIR Raman frequency comb is generated from single-mode silica fibers for the first time. This has potential applications in diverse areas such as spectroscopy, biomedical imaging, and quantum information.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Ji-Liang Wu, Xiaohui Guo, Yadong Jiao, Xucheng Zhang, Ting Wang, Yue-De Yang, Jin-Long Xiao, Daming Zhang, Guanshi Qin, Yong-Zhen Huang
Summary: In this study, an octave-spanning 10-GHz optical comb is achieved using a directly-modulated microlaser, and the optical pulse width is further reduced to 140 fs in a fiber through optimal chirp compensation.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Mikhail I. Skvortsov, Kseniya V. Proskurina, Evgeniy V. Golikov, Alexander V. Dostovalov, Vadim S. Terentyev, Olga N. Egorova, Sergey L. Semjonov, Sergey A. Babin
Summary: A distributed Bragg reflector (DBR) laser with a specially designed, heavily Er3+-doped composite fiber of a length as short as 1.8 cm is demonstrated. The DBR laser, pumped by a 980 nm laser diode with power of up to 370 mW, generates single-frequency radiation at a wavelength of 1535 nm with a narrow instantaneous linewidth of <100 Hz and a high output power of 2 mW. The obtained Er3+-doped fiber laser parameters pave the way toward a broad range of practical applications from telecommunications and sensing to scientific research.
Article
Optics
A. R. Muhammad, A. M. Markom, S. W. Harun, Z. Jusoh, P. Yupapin
Summary: The experimental investigation demonstrated the use of newly developed copper nanoparticles as a saturable absorber in the 1550 nm operating region, generating laser output with high signal-to-noise ratio and long-term stability.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
A. M. Smirnov, O. Butov
Summary: By comparing heavily erbium-doped fiber lasers under different pumping wavelengths, this study found that the frequency and pulse duration of Q-switched laser operations primarily depend on the output laser power, rather than the pump wavelength. Pulse formation is caused by the lasing process itself and is related to the up-conversion rate, while the level of laser cavity heating in the Q-switched operation mode was also defined.
Article
Astronomy & Astrophysics
Shubham Kanodia, Lawrence W. Ramsey, Marissa Maney, Suvrath Mahadevan, Caleb Canas, Joe P. Ninan, Andrew Monson, Adam F. Kowalski, Maximos C. Goumas, Gudmundur Stefansson, Chad F. Bender, William D. Cochran, Scott A. Diddams, Connor Fredrick, Samuel Halverson, Fred Hearty, Steven Janowiecki, Andrew J. Metcalf, Stephen C. Odewahn, Paul Robertson, Arpita Roy, Christian Schwab, Ryan C. Terrien
Summary: High-resolution observations using the HPF spectrograph reveal the presence of a flaring event in the M8 dwarf vB 10, with a red asymmetry in the He λ10830 triplet similar to coronal rain in the Sun. Time-series analysis of the flare and comparisons with historical observations provide constraints on the energy and frequency of such flares, allowing for an estimation of flare-induced atmospheric mass loss for hypothetical planets around vB 10.
ASTROPHYSICAL JOURNAL
(2022)
Article
Optics
Connor Fredrick, Freja Olsen, Ryan Terrien, Suvrath Mahadevan, Franklyn Quinlan, Scott A. Diddams
Summary: Precision laser spectroscopy is important for the development of atomic and molecular physics as well as related technologies. In this work, laser-based heterodyne radiometry is used to measure incoherent light sources in the near-infrared, and techniques for absolute frequency calibration with a laser frequency comb are introduced. The solar continuum is measured with a signal-to-noise ratio matching the thermal photon distribution. The study also proposes concepts for reducing pointing instabilities and increasing data acquisition rates and spectral bandwidths using refractive beam shaping and frequency comb multiplexing. These findings have implications for solar and astronomical spectroscopy, remote sensing, and precise Doppler velocimetry.
Article
Astronomy & Astrophysics
Corey Beard, Paul Robertson, Shubham Kanodia, Jessica Libby-Roberts, Caleb Canas, Arvind F. Gupta, Rae Holcomb, Sinclaire Jones, Henry A. Kobulnicky, Andrea S. J. Lin, Jack Lubin, Marissa Maney, Brock A. Parker, Gudmundur Stefansson, William D. Cochran, Michael Endl, Leslie Hebb, Suvrath Mahadevan, John Wisniewski, Chad F. Bender, Scott A. Diddams, Mark Everett, Connor Fredrick, Samuel Halverson, Fred Hearty, Andrew J. Metcalf, Andrew Monson, Joe P. Ninan, Arpita Roy, Maria Schutte, Christian Schwab, Ryan C. Terrien
Summary: We validated the planetary nature of two planets, TOI-1696b and TOI-2136b, orbiting M dwarfs. These mini-Neptunes are potential targets for atmospheric characterization using the JWST. Our validation process involved high-contrast imaging, ground-based photometry, and near-infrared radial velocities.
ASTRONOMICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Gudmundur Stefansson, Suvrath Mahadevan, Cristobal Petrovich, Joshua N. Winn, Shubham Kanodia, Sarah C. Millholland, Marissa Maney, Caleb Canas, John Wisniewski, Paul Robertson, Joe P. Ninan, Eric B. Ford, Chad F. Bender, Cullen H. Blake, Heather Cegla, William D. Cochran, Scott A. Diddams, Jiayin Dong, Michael Endl, Connor Fredrick, Samuel Halverson, Fred Hearty, Leslie Hebb, Teruyuki Hirano, Andrea S. J. Lin, Sarah E. Logsdon, Emily Lubar, Michael W. McElwain, Andrew J. Metcalf, Andrew Monson, Jayadev Rajagopal, Lawrence W. Ramsey, Arpita Roy, Christian Schwab, Heidi Schweiker, Ryan C. Terrien, Jason T. Wright
Summary: Through spectroscopic observations and radial velocity analysis, it is found that the warm Neptune GJ 3470b is on a polar orbit, suggesting the presence of an outer companion to explain this orbit. The study also suggests that tidal heating from GJ 3470b's mild eccentricity has likely caused its radius to expand.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Astronomy & Astrophysics
Ryan C. Terrien, Allison Keen, Katy Oda, Winter Parts, Gudmundur Stefansson, Suvrath Mahadevan, Paul Robertson, Joe P. Ninan, Corey Beard, Chad F. Bender, William D. Cochran, Katia Cunha, Scott A. Diddams, Connor Fredrick, Samuel Halverson, Fred Hearty, Adam Ickler, Shubham Kanodia, Jessica E. Libby-Roberts, Jack Lubin, Andrew J. Metcalf, Freja Olsen, Lawrence W. Ramsey, Arpita Roy, Christian Schwab, Verne V. Smith, Ben Turner
Summary: Accurate tracking of the stellar magnetic field and rotation is crucial for studying M dwarfs and detecting their exoplanetary companions. This study used near-infrared spectroscopic monitoring to detect periodic variations in two old, slowly rotating M dwarfs, allowing for the confirmation of their rotation periods. The observed signals are consistent with variations in the photospheric magnetic fields, highlighting the importance of detailed line profile measurements in diagnosing stellar magnetic field variability.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Astronomy & Astrophysics
Shubham Kanodia, Jessica Libby-Roberts, Caleb Canas, Joe P. Ninan, Suvrath Mahadevan, Gudmundur Stefansson, Andrea S. J. Lin, Sinclaire Jones, Andrew Monson, Brock A. Parker, Henry A. Kobulnicky, Tera N. Swaby, Luke Powers, Corey Beard, Chad F. Bender, Cullen H. Blake, William D. Cochran, Jiayin Dong, Scott A. Diddams, Connor Fredrick, Arvind F. Gupta, Samuel Halverson, Fred Hearty, Sarah E. Logsdon, Andrew J. Metcalf, Michael W. McElwain, Caroline Morley, Jayadev Rajagopal, Lawrence W. Ramsey, Paul Robertson, Arpita Roy, Christian Schwab, Ryan C. Terrien, John Wisniewski, Jason T. Wright
Summary: We present the discovery of a new Jovian-sized planet, TOI-3757 b, the lowest-density transiting planet known to orbit an M dwarf (M0V). This planet adds to the small sample of gas giants around M dwarfs and provides an opportunity to test theories of planet formation. We propose two hypotheses to explain its low density, namely the low metallicity of its stellar host and tidal heating causing volume expansion. The low density and large scale height of TOI-3757 b make it an excellent target for studying atmospheric escape and composition.
ASTRONOMICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Caleb Canas, Shubham Kanodia, Chad F. Bender, Suvrath Mahadevan, Gudhmundur Stefansson, William D. Cochran, Andrea S. J. Lin, Hsiang-Chih Hwang, Luke Powers, Andrew Monson, Elizabeth M. Green, Brock A. Parker, Tera N. Swaby, Henry A. Kobulnicky, John Wisniewski, Arvind F. Gupta, Mark E. Everett, Sinclaire Jones, Benjamin Anjakos, Corey Beard, Cullen H. Blake, Scott A. Diddams, Zehao Dong, Connor Fredrick, Elnaz Hakemiamjad, Leslie Hebb, Jessica E. Libby-Roberts, Sarah E. Logsdon, Michael W. McElwain, Andrew J. Metcalf, Joe P. Ninan, Jayadev Rajagopal, Lawrence W. Ramsey, Paul Robertson, Arpita Roy, Jacob Ruhle, Christian Schwab, Ryan C. Terrien, Jason T. Wright
Summary: This article confirms the planetary nature of two gas giants discovered by the Transiting Exoplanet Survey Satellite. The properties of these planets, such as their mass, radius, and orbital period, have been characterized using ground-based and space-based observations. These warm gas giants are suitable for further investigation of their atmospheric chemistry and formation scenarios using transmission spectroscopy.
ASTRONOMICAL JOURNAL
(2022)
Article
Optics
Naijun Jin, Charles A. Mclemore, David Mason, James P. Hendrie, Yizhi Luo, Megan L. Kelleher, Prashanta Kharel, Franklyn Quinlan, Scott A. Diddams, Peter T. Rakich
Summary: The Fabry-Perot resonator is widely used in various fields and this paper introduces a scalable approach to fabricate mirrors with ultrahigh finesse. The method allows for the production of high-finesse resonators with a wide range of mirror geometries, which is important for emerging quantum optics and frequency metrology technologies.
Article
Optics
Nazanin Hoghooghi, Sida Xing, Peter Chang, Daniel Lesko, Alexander Lind, Greg Rieker, Scott Diddams
Summary: Mid-infrared (MIR) spectrometers are essential for studying molecular fingerprinting and hyper-spectral imaging. However, current GHz MIR dual-comb absorption spectrometers lack the ability to combine high speed, high spectral resolution, and broad optical bandwidth. This study introduces a broadband MIR frequency comb laser platform that overcomes these limitations, enabling accurate characterization of complex, transient events in chemistry, combustion, and microscopy.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Optics
Daniel M. B. Lesko, Kristina F. Chang, Scott A. Diddams
Summary: Non-perturbative and phase-sensitive light-matter interactions have been studied to generate attosecond pulses and control electrical currents. The use of solid state crystals combined with low pulse energy frequency combs and high-sensitivity demodulation techniques allows for the measurement of nonlinear effects dependent on the carrier-envelope phase. This research provides robust and ultra-sensitive methods for studying attosecond nonlinear processes in solid state systems.
Article
Astronomy & Astrophysics
Shubham Kanodia, Suvrath Mahadevan, Jessica Libby-Roberts, Gudmundur Stefansson, Caleb I. Canas, Anjali A. A. Piette, Alan Boss, Johanna Teske, John Chambers, Greg Zeimann, Andrew Monson, Paul Robertson, Joe P. Ninan, Andrea S. J. Lin, Chad F. Bender, William D. Cochran, Scott A. Diddams, Arvind F. Gupta, Samuel Halverson, Suzanne Hawley, Henry A. Kobulnicky, Andrew J. Metcalf, Brock A. Parker, Luke Powers, Lawrence W. Ramsey, Arpita Roy, Christian Schwab, Tera N. Swaby, Ryan C. Terrien, John Wisniewski
Summary: We report the discovery of TOI-5205b, a transiting Jovian planet orbiting a solar metallicity M4V star. It has one of the highest mass ratios for M-dwarf planets, and its large size results in one of the deepest transits of a confirmed exoplanet orbiting a main-sequence star. TOI-5205b's high mass challenges conventional theories of planet formation and disk scaling relations.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Jessica E. Libby-Roberts, Maria Schutte, Leslie Hebb, Shubham Kanodia, Caleb I. Canas, Guomundur Stefansson, Andrea S. J. Lin, Suvrath Mahadevan, Winter Parts, Luke Powers, John Wisniewski, Chad F. Bender, William D. Cochran, Scott A. Diddams, Mark E. Everett, Arvind F. Gupta, Samuel Halverson, Henry A. Kobulnicky, Adam F. Kowalski, Alexander Larsen, Andrew Monson, Joe P. Ninan, Brock A. Parker, Lawrence W. Ramsey, Paul Robertson, Christian Schwab, Tera N. Swaby, Ryan C. Terrien
Summary: We conducted a thorough analysis of the TOI-3884 system, which is a validated M4-dwarf star with a transiting super-Neptune. Through high-precision light curves and radial velocity observations, we determined the planetary mass and radius of TOI-3884b. We also observed a starspot crossing event after every ingress, revealing wavelength dependence and evolving amplitude and duration over time. This system provides a unique opportunity to study the nature of a misaligned super-Neptune and spot evolution on an active mid-M dwarf.
ASTRONOMICAL JOURNAL
(2023)
Article
Optics
Megan L. Kelleher, Charles A. Mclemore, Dahyeon Lee, Josue Davila-Rodriguez, Scott A. Diddams, Franklyn Quinlan
Summary: We have developed and demonstrated a compact portable Fabry-Perot optical reference cavity with a volume of less than 6 mL. The laser locked to the cavity achieves a thermal noise-limited fractional frequency stability of 2 x 10-14. By utilizing an electro-optic modulator for broadband feedback control, our design achieves near thermal-noise-limited phase noise performance from 1 Hz to 10 kHz offset frequencies. The low vibration, temperature, and holding force sensitivity of our design make it suitable for various out-of-the-lab applications such as optically derived low noise microwave generation, compact and mobile optical atomic clocks, and environmental sensing through deployed fiber networks.
Article
Astronomy & Astrophysics
Andrea S. J. Lin, Jessica E. Libby-Roberts, Jaime A. Alvarado-Montes, Caleb I. Canas, Shubham Kanodia, Te Han, Leslie Hebb, Eric L. N. Jensen, Suvrath Mahadevan, Luke C. Powers, Tera N. Swaby, John Wisniewski, Corey Beard, Chad F. Bender, Cullen H. Blake, William D. Cochran, Scott A. Diddams, Robert C. Frazier, Connor Fredrick, Michael Gully-Santiago, Samuel Halverson, Sarah E. Logsdon, Michael W. McElwain, Caroline Morley, Joe P. Ninan, Jayadev Rajagopal, Lawrence W. Ramsey, Paul Robertson, Arpita Roy, Christian Schwab, Guomundur Stefansson, Daniel J. Stevens, Ryan C. Terrien, Jason T. Wright
Summary: TOI-1899 b is a rare exoplanet, a temperate warm Jupiter orbiting an M dwarf. By accurately measuring its orbital period, radius, planet mass, and eccentricity, we can gain a better understanding of the characteristics and formation mechanisms of this planet.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Caleb I. Canas, Shubham Kanodia, Jessica Libby-Roberts, Andrea S. J. Lin, Maria Schutte, Luke Powers, Sinclaire Jones, Andrew Monson, Songhu Wang, Gudmundur Stefansson, William D. Cochran, Paul Robertson, Suvrath Mahadevan, Adam F. Kowalski, John Wisniewski, Brock A. Parker, Alexander Larsen, Franklin A. L. Chapman, Henry A. Kobulnicky, Arvind F. Gupta, Mark E. Everett, Bryan Edward Penprase, Gregory Zeimann, Corey Beard, Chad F. Bender, Knicole D. Colon, Scott A. Diddams, Connor Fredrick, Samuel Halverson, Joe P. Ninan, Lawrence W. Ramsey, Arpita Roy, Christian Schwab
Summary: We confirm the planetary nature of two gas giants discovered by TESS that transit M dwarfs with stellar companions at wide separations. TOI-3984 A is an M4 dwarf hosting a short-period gas giant with a wide-separation white dwarf companion. TOI-5293 A is an M3 dwarf hosting a short-period gas giant with a wide-separation M dwarf companion.
ASTRONOMICAL JOURNAL
(2023)
