This is the syndication feed for photonics.com: Light Sources. https://www.photonics.com/Splash.aspx?Tag=Light+Sources Mon, 09 Oct 2023 21:55:26 GMT Fri, 06 Oct 2023 07:00:00 GMT 1800
The researchers used indirect OLED pumping to power the laser. They built an integrated device structure that efficiently coupled an OLED that had very high light output with a polymer-based, distributed feedback laser.

Most organic semiconductor lasers are optically pumped by another laser — a complicated, expensive process. Electrical pumping, which involves injecting a current to generate a population inversion, is challenging to achieve in organic...]]> https://www.photonics.com/Articles/OLEDs_Could_Be_Solution_to_Electrically_Driven/a69376 A69376 Fri, 06 Oct 2023 07:00:00 GMT
The Science and Technology Facilities Council (STFC) Central Laser Facility (CLF) was awarded £85 million ($103.2 million) by UK Research and Innovation for an upgrade initiative that includes construction of the Vulcan 20-20 laser, which is set to be the most powerful laser in the world.
The CLF’s Vulcan laser will receive a significant upgrade that will bring the laser’s energy output to 20 PW. The upgrade will take place over the course of six years. Courtesy of the Science and Technology Facilities Council. CLF, based at the STFC Rutherford Appleton Laboratory, uses a suite of lasers to generate plasma. The most powerful of the CLF’s lasers is Vulcan, with Vulcan 20-20 expected to be 100 times brighter than...]]> https://www.photonics.com/Articles/UKs_Central_Laser_Facility_Receives_Over_100M/a69372 A69372 Thu, 05 Oct 2023 07:00:00 GMT
The news comes one week after ams OSRAM said it will receive more than €300 million from Germany’s Federal Ministry for Economic Affairs and Climate Action and the Free State of Bavaria to support investments in the R&D of innovative optoelectronic components at its Regensburg, Germany, location, which is home to ams OSRAM’s Osram Opto Semiconductors GmbH.

In July, the...]]> https://www.photonics.com/Articles/ams_Osram_Unveils_Refinancing_Plan_as_Company/a69371 A69371 Wed, 04 Oct 2023 07:00:00 GMT
Terahertz (THz) waves can be used to probe the magnetic properties of new materials. Efficient THz wave generation could advance applications in energy harvesting, ultrafast electronics, and THz spectroscopy.

Bright, coherent THz light sources can be achieved via high-frequency, high-density charge currents. It is possible to produce strong current density that is several orders of magnitude higher than what is typically found in electronic devices, by exciting nanometer-scale, metallic interfaces with femtosecond laser pulses.

To harness the power of high-density charge currents for generating THz waves, researchers at Fudan University, Shanghai Research Center for Quantum Sciences, and Beijing Normal University developed an...]]> https://www.photonics.com/Articles/THz_Generation_Technique_Could_Transform_Field_of/a69368 A69368 Tue, 03 Oct 2023 07:00:00 GMT
Postpartum hemorrhage, the leading and most preventable cause of maternal mortality, can be hard to detect, because physiological compensation mechanisms can mask excessive bleeding. In the early stages of hemorrhage, the sympathetic nervous system becomes activated to ensure adequate perfusion of vital organs and, in turn, vital signs remain stable.

Worldwide, the most common methods of diagnosing postpartum hemorrhage are visual estimation of blood loss or monitoring of vital signs. Blood loss is routinely underestimated beyond the point of early intervention.

To diagnose postpartum hemorrhage in its early stages, a multidisciplinary research team at Washington University in St. Louis developed a wearable optical device that...]]> https://www.photonics.com/Articles/Wearable_Sensor_Could_Lower_Mortality_Due_to/a69365 A69365 Tue, 03 Oct 2023 07:00:00 GMT
With the development of a single-layer, blue-emitting OLED, researchers at the Max Planck Institute (MPI) for Polymer Research demonstrated that one-layer OLEDs can achieve a performance level comparable to commercial OLEDs with multiple layers, while simplifying OLED design, fabrication, and analysis.

Early OLEDs had a simple device structure. A semiconducting layer was sandwiched between two electrodes. Holes were injected into the organic semiconductor layer via the anode, and electrons via the cathode. Since then, considerable efficiency gains have been made by increasing the number of functional layers in OLEDs.

However, multilayer OLEDs are complex to design and fabricate. The need for additional fabrication steps can...]]> https://www.photonics.com/Articles/Single-Layer_OLED_Design_Offers_Efficiency/a69361 A69361 Thu, 28 Sep 2023 07:00:00 GMT
Austria-based ams OSRAM will receive more than €300 million ($317.3 million) in funding over the next five years from Germany’s Federal Ministry for Economic Affairs and Climate Action and the Free State of Bavaria. The Important Project of Common European Interest (IPCEI) funding will support the company in making its own investments in the R&D of innovative optoelectronic components at its Regensburg location, which is home to ams OSRAM's Osram Opto Semiconductors GmbH.

The company said that its main investment beyond activities supporting R&D pursuits will target manufacturing processes, creating 400 jobs. ams OSRAM will invest in new cleanroom and laboratory facilities for research, development, and pilot...]]> https://www.photonics.com/Articles/ams_OSRAM_to_Receive_300M_in_Funding_to_Drive/a69355 A69355 Wed, 27 Sep 2023 07:00:00 GMT
Automotive technology solutions developer indie Semiconductor, a fabless semiconductor company whose technology supports driver safety and automation, has acquired EXALOS AG. The Swiss photonics company specializes in the design of high-performance optical semiconductors. The deal, which indie said accelerates design-in opportunities with Tier One and automotive OEMs, expands indie’s advanced driver assistance and user experience portfolio with near-infrared and visible superluminescent LED (SLED) products, as well as semiconductor optical amplifier (SOA) products. Specifically, indie said that EXALOS’ SLEDs for fiber optic gyroscope and SOAs will complement its existing portfolio of laser and silicon photonics products geared...]]> https://www.photonics.com/Articles/Indie_Semiconductor_Acquires_EXALOS_AG/a69336 A69336 Tue, 19 Sep 2023 09:26:54 GMT
The NTT Corp. and Kitami Institute of Technology (KIT) achieved a milestone in high-speed communications. The two organizations were able to deliver electric power exceeding 1 W to a remote location 10 km distant using a single optical fiber.

Optical communication technology and wireless access are essential for high-speed data communication. However, providing power to remote areas to establish base stations for radio access and optical communication transmitters and receivers remains a challenge. Additionally, natural disasters such as earthquakes, floods, fires, hurricanes, and typhoons may result in prolonged power outages, underscoring the need for rapid communication in affected regions.

Researchers have been...]]> https://www.photonics.com/Articles/NTT_Produces_Optical_Power_Supply_for_High-Speed/a69333 A69333 Tue, 19 Sep 2023 07:00:00 GMT
The ability to measure the size and color of the light at the same time could improve a crucial step in chipmaking — lithography — by enabling lithography machines to make smaller, faster chips. To produce the microsize chips used in most electronic devices, lithography machines need precision-engineered lenses, mirrors, and light sources.

“Traditionally, we could only look...]]> https://www.photonics.com/Articles/Precise_Measuring_Tool_for_Light_Source_Could/a69335 A69335 Tue, 19 Sep 2023 07:00:00 GMT
Michael Ersoni, Excelitas’ executive vice president of commercial business, noted the complementary nature of both companies’ technologies — notably, Heraeus...]]> https://www.photonics.com/Articles/Excelitas_Technologies_to_Acquire_Heraeus/a69331 A69331 Fri, 15 Sep 2023 13:35:57 GMT
A multispectral, super-low-dose photoacoustic microscopy (SLD-PAM) system developed by City University of Hong Kong (CUHK) achieves significantly higher sensitivity than traditional optical resolution photoacoustic imaging.

By providing an exceptionally high level of sensitivity, SLD-PAM could help broaden the use of photoacoustic microscopy in biomedical applications. In the future, it could translate to clinical settings; for example, it could be used for ophthalmic exams where a low-power laser is preferred for the patient’s safety and comfort. Long-term monitoring of pharmacokinetics or blood flow also requires low-dose imaging to alleviate perturbation to tissue function.
(a) SLD-PAM system and (b) sensitivity...]]> https://www.photonics.com/Articles/Super-Sensitive_PAM_Ensures_Image_Quality_with/a69327 A69327 Fri, 15 Sep 2023 07:00:00 GMT
High resolution and high definition are key to delivering a realistic visual experience in augmented reality (AR) and other immersive technologies. Inexpensive micro-LEDs that enable full-color imaging at high resolution could help immersive displays reach their full potential.

A design for gallium indium nitride (GaInN)-based micro-LEDs, developed by researchers at Meijo University and King Abdullah University of Science and Technology (KAUST), could play a role in advancing metaverse applications to the next level by improving the definition, resolution, and saturation of their colors.
Display trends and targets of the micro-LED array technology. Courtesy of Motoaki Iwaya/Meijo University.
GaInN semiconductors are used to...]]> https://www.photonics.com/Articles/Micro-LEDs_Heighten_Color_and_Definition_for/a69324 A69324 Thu, 14 Sep 2023 07:00:00 GMT
Optical resonators are used to control light in a range of photonic applications, from pocket-size laser pointers to quantum computers. When a resonator experiences optical loss, its ability to trap and concentrate photons deteriorates, reducing its ability to control the photons’ behavior.

Researchers at Aalto University devised a way to eliminate both the radiation and the absorption losses in optical resonators. The new loss-mitigation technique could considerably boost the performance of photonic applications and devices that depend on resonant enhancement of light-matter interaction.

In resonant optical systems, the average amount of time each photon spends trapped inside the resonator, before it either escapes or is...]]> https://www.photonics.com/Articles/Optical_Resonator_Design_Eliminates_Loss/a69317 A69317 Wed, 13 Sep 2023 07:00:00 GMT
A team at Harbin Institute of Technology led by professor Yufei Ma introduced an approach to phase demodulation of heterodyne light-induced thermoelastic spectroscopy (H-LITES) that uses a Fabry-Pérot interferometer (FPI). Compared with traditional intensity demodulation systems, the new phase demodulation method is structurally simple and is resistant to interference from light sources and the surrounding environment when the LITES technique is used.
Diagram of the experimental setup. Pictured: continuous-wave distributed feedback (CW-DFB), fiber collimator (FC), photodetector (PD), quartz tuning fork (QTF), and single-mode fiber (SMF). Courtesy of Z. Lang et al.
LITES provides extremely high-sensitivity and noncontact...]]> https://www.photonics.com/Articles/LITE_Spectroscopy_Resists_Light_Sources_with/a69315 A69315 Tue, 12 Sep 2023 07:00:00 GMT
Superlenses made of plasmonic materials and metamaterials can image features at the subdiffraction scale. However, intrinsic losses restrict the image resolution of superlenses, hindering their widespread use.

To compensate for optical loss in superimaging systems, researchers at the University of Hong Kong (HKU) devised a way to provide virtual gain. To do so, they synthesized excitation waves of complex frequency, based on measurements at real frequencies. By illuminating materials with synthetic frequency waves, the researchers were able to implement virtual gain experimentally and retrieve subwavelength features. The multifrequency approach from HKU could provide a practical solution to overcoming the intrinsic losses of...]]> https://www.photonics.com/Articles/Complex_Frequency_Waves_Compensate_for_Optical/a69311 A69311 Mon, 11 Sep 2023 07:00:00 GMT
The move comes less than one year after micro-LED-based chip-to-chip interconnects manufacturer Avicena acquired a micro-LED fabrication facility and associated...]]> https://www.photonics.com/Articles/Shoei_Chemical_Acquires_Quantum_Dot_Business_from/a69312 A69312 Mon, 11 Sep 2023 07:00:00 GMT
The ability to image complex biological tissues is essential for many biological studies and clinical diagnostic applications. However, capturing detailed 3D images of thick biological samples is difficult, due to multiple light-scattering in the samples.

Optical diffraction tomography is still largely restricted to imaging thin objects such as cells and thin tissue slices. To allow for in vivo imaging with extended imaging depth, a full-field, reflection-mode measurement geometry needs to be implemented. Also, a comprehensive inverse-scattering model that accounts for the temporal dispersion and spatial aberration of the back-scattered field from thick, inhomogeneous media needs to be developed. In addition, the multiple-scattering...]]> https://www.photonics.com/Articles/Tomography_Technique_Images_Thick_Bio_Samples_at/a69307 A69307 Fri, 08 Sep 2023 07:00:00 GMT
Dresden, Germany-based startup beeOLED has raised €13.3 million ($14.4 million) in series A funding to further develop its high-efficiency deep-blue emitter technology and advance the emitters toward commercial availability. The company aims to overcome a bottleneck that has to date prevented a market-ready technology that delivers deep-blue OLED emitters that are both stable and efficient at the same time. Currently, according to the company, such emitters are either only stable, like fluorescent emitters, or efficient, like phosphorescent emitters and/or thermally activated delayed fluorescence emitters.

The company said its intrametallic emission technology has previously demonstrated high stability and high efficiency when...]]> https://www.photonics.com/Articles/BeeOLED_Emerges_from_Stealth_to_Develop_Deep-Blue/a69287 A69287 Fri, 01 Sep 2023 07:00:00 GMT
According to Los Alamos researcher Han Htoon, the work shows that it’s possible for a monolayer semiconductor to emit circularly polarized light without the need for an external magnetic field. “This effect has only been achieved before with high magnetic fields created by bulky superconducting magnets, by coupling quantum emitters to very complex nanoscale photonics structures or by injecting spin-polarized carriers into quantum...]]> https://www.photonics.com/Articles/Quantum_Light_Source_Generates_Single_Photons/a69280 A69280 Tue, 29 Aug 2023 07:00:00 GMT