Article
Chemistry, Multidisciplinary
Lin Lin, Jack Hu, Sahil Dagli, Jennifer A. Dionne, Mark Lawrence
Summary: A new phase gradient metasurface made from high-quality silicon meta-atoms is capable of strong beam steering and near-field intensity enhancement. This metasurface offers unprecedented flexibility in light wave manipulation and has the potential for dynamic and nonlinear wave shaping.
Article
Optics
ShiNa Tao, ZhiXiong Shen, HongGuan Yu, HuaCai Wang, ShiJun Ge, Wei Hu
Summary: A spatial terahertz wave modulator based on a liquid-crystal-integrated metadevice is proposed, which allows for dynamic reconfiguration and modulation of terahertz waves.
Article
Optics
Benjamin Rudolf, Yang Du, Sergey Turtaev, Ivo T. Leite, Tomas Cizmar
Summary: Computer-controlled spatial modulation of coherent light has opened up new imaging possibilities through complex media. Digital micromirror devices (DMDs) offer higher display frame rates compared to liquid crystal technology, but thermal load can cause wavefront deviations impacting imaging performance over time. By actively controlling the temperature of the DMD, stability of high-speed wavefront shaping systems can be greatly extended without recalibration.
Article
Optics
Zhongtao Cheng, Chengmingyue Li, Anjul Khadria, Yide Zhang, Lihong V. V. Wang
Summary: Wavefront shaping is a promising tool for controlling and focusing light in complex scattering media. However, current methods have trade-offs that limit satisfactory performance. We report a technique that achieves high speed, high energy gain, and high control degrees of freedom simultaneously. This technique combines analogue optical phase conjugation and stimulated emission light amplification, resulting in significant energy gain and fast response time.
Article
Optics
Yanli Zhang, Shanshan Wang, Mingzhu She, Yunjiang Rao, Weili Zhang
Summary: A spectrally programmable Raman fiber laser (RFL) is developed using two-dimensional spatial-to-spectral mapping of light in multimode fibers (MMFs). By applying wavefront shaping and genetic algorithm optimization, specific wavelengths are amplified while undesired wavelengths are blocked, allowing flexible spectral manipulation. This research expands the capabilities of RFLs and has significant implications for optical imaging, sensing, and spectroscopy applications.
PHOTONICS RESEARCH
(2023)
Article
Optics
Tongyao Du, Dajie Huang, He Cheng, Wei Fan, Zhibo Xing, Xuechun Li, Jianqiang Zhu
Summary: This paper proposes an effective method to compensate for the performance degradation of optically addressed spatial light modulators. The method is verified through experiments and increases the laser withstand power of amplitude-only OASLM by about a factor of 2.5.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2022)
Article
Optics
Chene Tradonsky, Simon Mahler, Gaodi Cai, Vishwa Pal, Ronen Chriki, Asher A. Friesem, Nir Davidson
Summary: The method involves a digital degenerate cavity laser, phase-only spatial light modulator, and spatial filters to control the intensity, phase, and coherence distributions of laser beams. It can generate high-resolution arbitrary shaped laser beams with minimal change in output power by reshaping the beams efficiently through free space propagation.
Article
Crystallography
Junyu Zou, Qian Yang, En-Lin Hsiang, Haruki Ooishi, Zhuo Yang, Kifumi Yoshidaya, Shin-Tson Wu
Summary: The new nematic mixture features high birefringence, moderate dielectric anisotropy, low viscosity, and good photostability, making it suitable for various applications with fast response time.
Article
Optics
J. I. A. N. Z. H. O. U. Huang, Bin Hu, G. U. O. C. U. Wang, Z. O. N. G. Y. U. A. N. Wang, J. I. N. L. O. N. G. LI, J. U. A. N. Liu, Y. A. N. Zhang
Summary: This work demonstrates a reconfigurable THz phase modulator with 5x5 independently tunable units enabled by switching the voltages applied on 10 graphene ribbons. The efficiency of the device is enhanced by 2.7-3.6 times under different graphene chemical potentials through introducing quasi bound states in the continuum resonance using a designed double C-shaped antenna. Experimental results show the formation of a focus with a changed focal length from 14.3mm to 22.6mm. This work provides potential for compact THz spatial light modulators that may be applied in THz communication, detection, and imaging.
PHOTONICS RESEARCH
(2023)
Article
Physics, Multidisciplinary
Pascuala Garcia-Martinez, Ignacio Moreno, Maria del Mar Sanchez-Lopez, Jordi Gomis, Pedro Martinez, Aaron Cofre
Summary: The optical system presented in this work utilizes liquid-crystal on silicon spatial light modulators to spectrally filter a supercontinuum laser source, allowing dynamic spectrum control from a computer. This new system is capable of independently controlling visible and near infrared spectra, providing significant assistance for biological imaging applications.
FRONTIERS IN PHYSICS
(2021)
Article
Optics
Paloma E. S. Pellegrini, Claudecir R. Biazoli, Roberto R. Panepucci, Lucas H. Gabrielli
Summary: Graded index fibers have significant improvements in system performance due to their refractive index profile. An alternative method to control and tune the beam convergence at the distal end of the fibers was proposed by shaping the input wavefronts. Experimental results showed that using optimized wavefronts significantly enhanced the output power compared to non-optimal configuration.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Houjin He, Shiwei Tang, Ziwei Zheng, Fei Ding
Summary: Different from conventional waveplates, metasurfaces offer full-range birefringence control and wavefront shaping capabilities, resulting in miniaturized planar meta-waveplates with fancy functionalities. In this Letter, we design dielectric metasurface quarter-wave plates for efficient circular-to-linear polarization conversion and complete phase control. Based on this platform, we demonstrate two multifunctional meta-waveplates that generate different wavefronts, mimicking cascaded optical components. Due to their compactness, flexibility, and versatility, such meta-waveplates can integrate advanced applications in polarization optics.
Article
Optics
Sam R. McArthur, Robert R. Thomson, Calum A. Ross
Summary: In this paper, a parameter-space investigation on ultrafast-laser-induced selective chemical etching is conducted. The results show that there is an influence on focus elongation and etching selectivity, and high-throughput laser writing with controllable depth-of-focus is successfully demonstrated.
Article
Chemistry, Multidisciplinary
Elissa Klopfer, Sahil Dagli, David Barton, Mark Lawrence, Jennifer A. Dionne
Summary: Dynamically reconfigurable metasurfaces with high tuning efficiency and high quality factor are designed and computationally investigated. Independent control of constituent nanobars allows for full phase tunability.
Article
Optics
Haifeng Xu, Jierong Cheng, Yunyun Ji, Fei Fan, Shengjiang Chang
Summary: Describes a metasurface that uses local phase modulation in subwavelength unit cells for wavefront shaping. Multiple beams are assigned to different diffraction orders located coaxially along the same direction, with their wavefronts tailored by optimizing the diffraction coefficients in two orders and two polarization states of a supercell. By evenly splitting the energy into two orders and adjusting the zeroth-order diffraction phase, a Bessel beam and a vortex beam are simultaneously generated in the near field and far field along a coaxial direction.
Article
Optics
Bianka Csanakova, Ondrej Novak, Lukas Roskot, Jiri Muzik, Martin Cimrman, Jaroslav Huynh, Martin Smrz, Helena Jelinkova, Tomas Mocek
Summary: Many fields benefit from mid-infrared light sources, and there is a growing demand for high-power, picosecond mid-infrared sources. This study optimized an optical parametric generator by comparing single-pass and double-pass arrangements. The double-pass arrangement significantly increased the output power, resulting in over ten-fold power increase.
Article
Optics
Lukas Roskot, Ondrej Novak, Bianka Csanakova, Jim Muiik, Martin Smri, Michal Jelinek, Tomas Mocek
Summary: In this paper, the stability characteristics of a supercontinuum (SC) generated in an undoped YAG crystal pumped by a Yb thin-disk regenerative amplifier are presented. The effect of crystal length on the stability is investigated, and it is found that the optimal crystal length is 130 mm. The energy contained in the blueshifted side exhibits significantly improved stability compared to the pump beam.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Optics
Ondrej Slezak, David Vojna, Jan Pilar, Martin Divoky, Ondrej Denk, Martin Hanus, Petr Navratil, Martin Smrz, Antonio Lucianetti
Summary: We present the first-ever demonstration of optical isolation for a kilowatt average power pulsed laser. A Faraday isolator was developed and tested, providing stable protection for a laser amplifier chain delivering high-energy, high-repetition-rate laser pulses. This breakthrough opens up possibilities for industrial and scientific applications.
Article
Materials Science, Multidisciplinary
David Vojna, Denis N. Karimov, Anna G. Ivanova, Pavel A. Popov, Hikaru Kumai, Ryo Yasuhara, Ondrej Slezak, Martin Smrz, Tomas Mocek
Summary: The latest research emphasizes the advantages of using crystalline media with negative optical anisotropy parameter (OAP) for Faraday devices. These media eliminate the degrading impact of thermal-stress-induced birefringence in high power light operations. The successful growth of OAP-negative fluoride crystals (KDF and NDF) and their material properties have been characterized, demonstrating the transparency at mid-IR wavelengths and sufficient Verdet constant for practical implementation.
Article
Optics
Mariastefania de Vido, P. Jonathan Phillips, David Meissner, Stephanie Meissner, Gary Quinn, Saumyabrata Banerjee, Martin Divoky, Paul D. Mason
Summary: This study reports the successful amplification of 10 ns pulses to 10 J energy at 10 Hz using Yb:YAG/Cr:YAG composite slabs manufactured with adhesive-free bonding (AFB) technology. It also demonstrates frequency doubling of the amplified beam in the bonded slabs. The results indicate that AFB technology is suitable for producing large-sized gain material slabs and can overcome limitations in manufacturing large-aperture gain material pieces.
Article
Optics
Sami Slimi, Venkatesan Jambunathan, Ghassen Zin Elabedine, Haohai Yu, Huaijin Zhang, Weidong Chen, Rosa Maria Sole, Magdalena Aguilo, Francesc Diaz, Martin Smrz, Tomas Mocek, Xavier Mateos
Summary: We conducted optical spectroscopy and CW laser operation of ytterbium-doped yttrium gallium garnet (Yb:YGG) crystal at cryogenic temperatures. The study determined a maximum absorption cross-section of 1.7 x 10-20 cm2 centered at 970.5 nm with a spectral bandwidth of 2.4 nm, and a maximum emission cross-section of 6.5 x 10- 20 cm2 centered at 1024 nm with a spectral bandwidth of 4.6 nm at 120 K. Cryogenic continuous-wave laser operation was achieved using a VBG stabilized laser diode as the pump source emitting around 969 nm. At 120 K, a maximum output power of 17.50 W was obtained at 1024 nm with a slope efficiency of 87%, relative to the absorbed power.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Martin Divoky, Jonathan Phillips, Jan Pilar, Martin Hanus, Petr Navratil, Ondrej Denk, Tomas Paliesek, Patricie Severova, Danielle Clarke, Martin Smrz, Thomas Butcher, Chris Edwards, John Collier, Tomas Mocek
Summary: This study reports on the frequency doubling of high-energy, high repetition rate ns pulses using a cryogenically gas cooled multi-slab ytterbium-doped yttrium aluminum garnet laser system, Bivoj/DiPOLE, employing a type-I phase matched lithium triborate crystal. Conversion to 515 nm with an energy of 95 J at a repetition rate of 10 Hz and a conversion efficiency of 79% was achieved. The high conversion efficiency was attributed to the successful depolarization compensation of the fundamental input beam.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2023)
