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The image on the cover for Photonics Research Volume 10, Issue 7, demonstrates an on-chip path encoded photonic quantum Toffoli gate enabled by the 3D capability of the femtosecond laser direct writing (FLDW) for the first time, whose truth-table fidelity is higher than 85.5%. The image is based on original research by Meng Li et al. presented in their paper "On-chip path encoded photonic quantum Toffoli gate", Photonics Research 10 (7), 1533 (2022).

The image on the cover for Chinese Optics Letters Volume 20, Issue 7, presents a simple way to experimentally probe fluorescence quantum efficiency of single dibenzoterrylene molecules embedded in a thin anthracene microcrystal obtained through a co-sublimation process. The image is based on original research by Penglong Ren et al. presented in their paper "Probing fluorescence quantum efficiency of single molecules in an organic matrix by monitoring lifetime change during sublimation", Chinese Optics Letters 20 (7), 073602. (2022)

The image on the cover for Photonics Research Volume 10, Issue 6, proposes a broadband high-efficiency polarization-multiplexing method based on a geometric phase polymerized liquid crystal metasurface to yield the polarization-switchable functionalities in the visible. The image is based on original research by Xinjian Lu et al. presented in their paper "Broadband high-efficiency polymerized liquid crystal metasurfaces with spin-multiplexed functionalities in the visible", Photonics Research 10 (6), 1380 (2022).

The image on the cover for Chinese Optics Letters Volume 20, Issue 6, demonstrate an ultra-compact short-wave infrared (SWIR) multispectral detector chip by monolithically integrating the narrowband Fabry&ndash;Perot microcavities array with the InGaAs detector focal plane array. The image is based on original research by Zhiyi Xuan et al. presented in their paper " On-chip short-wave infrared multispectral detector based on integrated Fabry&ndash;Perot microcavities array", Chinese Optics Letters 20 (6), 061302. (2022)

Three-year-old journal ranked among top optics journals in first year of recognition.

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An international team of scientists has uncovered a new method for advancing the development of fusion energy through increased understanding of the properties of warm dense matter, an extreme state of matter similar to that found at the heart of giant planets like Jupiter. The findings, led by Sophia Malko of the U.S. Department of Energy's (DOE) Princeton Plasma Physics Laboratory (PPPL), detail a new technique to measure the "stopping power" of nuclear particles in plasma using high repetition-rate ultraintense lasers. The understanding of proton stopping power is particularly important for inertial confinement fusion (ICF).
High Power Laser Science and Engineering
• Sep. 22, 2022
• Vol. , Issue (2022)
Editors' Picks
Underwater optical wireless communication is very useful for many kinds of applications such as oceanography, environmental monitoring, and underwater surveillance. However, it suffers from extreme optical absorption and Mie-Rayleigh scatting in the water or seawater. Even if blue-green wavelengths as a distinct transmission window of the seawater for underwater optical wireless communication also suffer the Mie-Rayleigh scatting from water molecules, salt ions and phytoplankton and other transparent biological organisms. To develop underwater optical wireless communication, it is necessary to solve the problem from the Mie-Rayleigh scatting. Bessel beams or Bessel-like beams as non-diffracting and self-reconstructing beams are not attainable in conventional Gaussian beams optics limited by the classical Rayleigh range and overcome the underwater particle scattering effect to some extent.
Chinese Optics Letters
• Sep. 20, 2022
• Vol. 20, Issue 7 (2022)
Community-News
Photonics giant Hamamatsu and research hub Fraunhofer Institute for Laser Technology (ILT) have announced the formation of an application lab designed specifically for advanced laser material processing with ultrashort pulsed laser radiation.
High Power Laser Science and Engineering
• Sep. 16, 2022
• Vol. , Issue (2022)
Editors' Picks
Tunable coupled mechanical resonators have attracted considerable attention in quantum simulations, quantum computations, and non-Hermitian physics. In particular, the tunable coupled mechanical resonators with high mechanical frequency have great potential for realizing high-sensitive exceptional points sensors with increased resistance to environmental disturbances and sensing bandwidth.
Photonics Research
• Sep. 15, 2022
• Vol. 10, Issue 8 (2022)
Community-News
Researchers at Lawrence Berkeley National Laboratory (Berkeley Lab) have completed a major expansion of one of the world's most powerful laser systems, creating new opportunities in accelerator research for the future of high-energy physics and other fields.
High Power Laser Science and Engineering
• Sep. 15, 2022
• Vol. , Issue (2022)
• Sep.26，2022
• Advanced Photonics Nexus,Vol. 1, Issue 1
• 019901 (2022)
Full description of dipole orientation in organic light-emitting diodes

Considerable progress has been made in organic light-emitting diodes (OLEDs) to achieve high external quantum efficiency, among which dipole orientation h

Considerable progress has been made in organic light-emitting diodes (OLEDs) to achieve high external quantum efficiency, among which dipole orientation has a remarkable effect. In most cases, the radiation of the dipoles in OLEDs is theoretically predicted with only one orientation parameter to match with corresponding experiments. Here, we develop a new theory with three orientation parameters to fully describe the relationship between dipole orientation and power density. Furthermore, we design an optimal test structure for measuring all three orientation parameters. All three orientation parameters could be retrieved from non-polarized spectra. Our theory provides a universal plot of dipole orientations in OLEDs, paving the way for designing more complicated OLED devices.show less

• Sep.26，2022
• Chinese Optics Letters,Vol. 21, Issue 2
• 022601 (2023)
Self-filtering illumination source and application in fluorescence imaging

To date, fluorescence imaging systems have all relied on at least one beam splitter (BS) to ensure the separation of excitation light and fluorescence. He

To date, fluorescence imaging systems have all relied on at least one beam splitter (BS) to ensure the separation of excitation light and fluorescence. Here, we reported $SiO2/TiO2$ multi-layer long pass filter integrated GaN LED. It is considered as the potential source for imaging systems. Experimental results indicate that the GaN LED shows blue emission peaked at 470.3 nm and can be used to excite dye materials. Integrating with a long pass filter (550 nm), the light source can be used to establish a real-time fluorescence detection for dyes that emit light above 550 nm. More interestingly, with this source, a real-time imaging system with signature words written with the dyes, such as ‘N J U P T’, can be converted into CCD images. This work may lead to a new strategy for integrating light sources and BS mirrors to build mini and smart fluorescence imaging systems.show less

• Sep.26，2022
• Chinese Optics Letters,Vol. 21, Issue 1
• 011101 (2023)
Silicon photonic devices for scalable quantum information applications

With high integration density and excellent optical properties, silicon photonics is becoming a promising platform for complete integration and large-scal

With high integration density and excellent optical properties, silicon photonics is becoming a promising platform for complete integration and large-scale optical quantum information processing. Scalable quantum information applications need photon generation and detection to be integrated on the same chip, and we have seen that various devices on the silicon photonic chip have been developed for this goal. This paper reviews the relevant research results and state-of-the-art technologies on the silicon photonic chip for scalable quantum applications. Despite the shortcomings, the properties of some components have already met the requirements for further expansion. Furthermore, we point out the challenges ahead and future research directions for on-chip scalable quantum information applications.show less

• Sep.26，2022
• Photonics Research,Vol. 10, Issue 10
• A135 (2022)

We have observed various polarization domains and a giant self-mode-locked pulse in a 130 m long erbium-doped fiber laser without any mode-locking devices. By adjusting the intra-cavity

We have observed various polarization domains and a giant self-mode-locked pulse in a 130 m long erbium-doped fiber laser without any mode-locking devices. By adjusting the intra-cavity polarization controller, we investigated the evolution process of the polarization domain with the cavity birefringence varying. When the birefringence was close to zero, the polarization domains split into multi-domains, and finally a giant self-mode-locked pulse formed for the first time. We analyzed that the generation of the self-mode-locked pulse was related to the multiple sub-domains ascribed to the strong coherent cross coupling between the orthogonal polarization light components in the long fiber cavity.show less

• Sep.26，2022
• Chinese Optics Letters,Vol. 21, Issue 3
• (2023)

A diode-pumped continuous-wave Tm:YVO<sub>4</sub> laser operating on the <sup>3</sup>H<sub>4</sub> → <sup>3</sup>H<sub>5</sub>

A diode-pumped continuous-wave Tm:YVO<sub>4</sub> laser operating on the <sup>3</sup>H<sub>4</sub> → <sup>3</sup>H<sub>5</sub> and <sup>3</sup>F<sub>4</sub> → <sup>3</sup>H<sub>6</sub> transitions was demonstrated for the first time, to the best of our knowledge. An a-cut Tm:YVO<sub>4</sub> crystal with 1.5 at. % Tm<sup>3+</sup> ion concentration was used to characterize the laser behavior. A common commercial laser diode with a central wavelength of 790 nm and a bandwidth of 3.2 nm was utilized as a pump source. With an output coupler for the <sup>3</sup>H<sub>4</sub> → <sup>3</sup>H<sub>5</sub> and <sup>3</sup>F<sub></sub>4 → <sup>3</sup>H<sub>6</sub> transitions, simultaneous three-wavelength laser operation was achieved. The laser emissions at 2292 and 2363 nm in π-polarization and at 2108 nm in σ-polarization were realized. With an incident pump power of 22 W, the total output power of 1.17 W at 2292 nm, 2363 nm and 2108 nm was obtained. The output power at 2292 and 2363 nm was measured to be 750 mW, and the output power at 2108 nm was measured to be 420 mW. show less

• Sep.26，2022
• Chinese Optics Letters,Vol. 21, Issue 3
• (2023)

Self-healing in optics generally refers to the ability to self-reconstruct and restore the original state after encountering obstacles in the propagation of the light field. In this res

Self-healing in optics generally refers to the ability to self-reconstruct and restore the original state after encountering obstacles in the propagation of the light field. In this research, we observe the processes of the wave-fields from perfect to defect in front of the focal plane of the 4f system, finally returning to intact situation after the plane. According to simulations and experimental results, there is a minimum self-healing distance for the moiré lattice field that positively associates with the radius of the defect (obstacle) in the non-diffracting transmission range. Furthermore, it is observed that the defect self-healing is a process of “repairing the center and then repairing the edges”. These findings can be applied in areas such as optical imaging, capture, and information processing.show less

• Sep.26，2022
• Chinese Optics Letters,Vol. 21, Issue 3
• (2023)

We propose an alternative approach to compensation of intermodal interactions in few-mode optical fibers by means of digital back-propagation. Instead of solving the inverse generalized

We propose an alternative approach to compensation of intermodal interactions in few-mode optical fibers by means of digital back-propagation. Instead of solving the inverse generalized multimode nonlinear Schrödinger equation, we accomplish backpropagation of the multimode signals with help of their near-field intensity distributions captured by a camera. We demonstrate that this task can successfully be handled by a deep neural network and provide a proof of concept by training an autoencoder for backpropagation of six LP modes of a step index fiber.show less

• Sep.26，2022
• Chinese Optics Letters,Vol. 21, Issue 3
• (2023)
The image on the cover for Photonics Research Volume 10, Issue 7, demonstrates an on-chip path encoded photonic quantum Toffoli gate enabled by the 3D capability of the femtosecond laser direct writing (FLDW) for the first time, whose truth-table fidelity is higher than 85.5%. The image is based on original research by Meng Li et al. presented in their paper "On-chip path encoded photonic quantum Toffoli gate", Photonics Research 10 (7), 1533 (2022).
• Journal
• 14th Sep，2022
The image on the cover for Chinese Optics Letters Volume 20, Issue 7, presents a simple way to experimentally probe fluorescence quantum efficiency of single dibenzoterrylene molecules embedded in a thin anthracene microcrystal obtained through a co-sublimation process. The image is based on original research by Penglong Ren et al. presented in their paper "Probing fluorescence quantum efficiency of single molecules in an organic matrix by monitoring lifetime change during sublimation", Chinese Optics Letters 20 (7), 073602. (2022)
• Journal
• 14th Sep，2022