Shuxin Xiang’s Post

Gallium nitride (GaN) vertical-cavity surface-emitting lasers (VCSELs) are semiconductor laser diodes with promising applications in various fields, including adaptive headlights, retinal scanning displays, point-of-care testing systems, and high-speed visible light communication systems. Their high efficiency and low manufacturing costs make them especially appealing for these applications. GaN-VCSELs are composed of two layers of special semiconductor mirrors, called distributed Bragg reflectors (DBRs), separated by active GaN-semiconductor layers, which form the optical resonant cavity, where laser light is generated. The length of this resonant cavity is crucial for controlling the target laser wavelength, called the resonance wavelength. #lasers #light #resonance #wavelength #communications https://lnkd.in/gNgkrAm8

Fiber bundle technology improves the power and brightness of blue semiconductor laser Beam shaping using the same or close wavelength of the laser unit is the basis of multiple laser beam combination of different wavelengths. Among them, spatial beam bonding is to stack multiple laser beams in space to increase power, but may cause the beam quality to decrease. By using the linear polarization characteristic of semiconductor laser, the power of two beams whose vibration direction is perpendicular to each other can be increased by nearly twice, while the beam quality remains unchanged. Fiber bundler is a fiber device prepared on the basis of Taper Fused Fiber Bundle (TFB). It is to strip a bundle of optical fiber coating layer, and then arranged together in a certain way, heated at high temperature to melt it, while stretching the optical fiber bundle in the opposite direction, the optical fiber heating area melts into a fused cone optical fiber bundle. After cutting off the cone waist, fuse the cone output end with an output fiber. Fiber bunching technology can combine multiple individual fiber bundles into a large-diameter bundle, thus achieving higher optical power transmission. Figure 1 is the schematic diagram of blue laser fiber technology. The spectral beam combination technique utilizes a single chip dispersing element to simultaneously combine multiple laser beams with wavelength intervals as low as 0.1 nm. Multiple laser beams of different wavelengths are incident on the dispersive element at different angles, overlap at the element, and then diffract and output in the same direction under the action of dispersion, so that the combined laser beam overlaps each other in the near field and far field, the power is equal to the sum of the unit beams, and the beam quality is consistent. #Optical #photonics #semiconductor #Optics #opticalcenter #SiliconPhotonics #photodetectors #optomechanics #laser #Quantum Read more: https://lnkd.in/eaf5SA8j

This study proposes a groundbreaking method for integrating numerous lasers into a singular, high-performance device. This device outshines conventional lasers, including superior coherence, minimized linewidth, and amplified power. #IntegratedPhotonics #Lasers

For the last few decades, tabletop laser-plasma accelerators have brought significant progress to replace traditional high-energy accelerators, and the production of a relativistic electron beam (REB) from laser-plasma interaction has become a recent topic of interest in the laser plasma community through various methods like target modifications, ultra high intensities and by using high magnetic fields. REB has wide applications in the fast ignition technique of inertial confinement fusion, including many medical applications. In reference to our recent work [https://lnkd.in/dEEFTfZD], in the collision-less regime of laser cluster interaction (laser intensity, I0>10e16W/cm2 and laser wavelength λ>600nm), using a rigid sphere model (RSM) and a 3D particle-in-cell (PIC) simulation, we address a 15 − 30 fold (30 − 70Up , where Up is the ponderomotive energy) increase in laser energy absorption by cluster electrons (EA ) with an ambient magnetic field (B0). However, in many of the previously reported works, only with the laser field, EA is not more than 2−3Up. We show that enhancement of EA with B0 happens in two stages, anharmonic resonance (AHR) and electron-cyclotron resonance (ECR) absorption or relativistic ECR (RECR), by satisfying phase matching and frequency matching conditions. Further, these energetic electrons are distributed with narrow angular spreading in position as well as in momentum space within an angular range of 5◦ to 6◦ like a monoenergetic weakly REB [https://lnkd.in/devnGnEU]. The electron beam shown in the movie is generated by simulating a nano-meter size cluster target of radius 3.3nm (~7208 particles) using C++ based 3D PIC simulation in the collisionless regime of laser-cluster interaction with an ambient magnetic field at ECR/RECR for a short cycle laser pulse (~13.5fs) at non-relativistic intensities (<10e17 W/cm2). Color bar represents the corresponding energy of the electrons normalized with respect to Up. The laser is polarized along x and the electron beam propagates along the laser propagation direction z. #PlasmaSimulation #LaserPlasmaInteraction #PICsimulation

High accuracy? ✅ Low noise? ✅ Turn-key operation? ✅ Menlo Systems's Optical Frequency Combs are the ultimate tools for precise measurements. Highlights: ⚙️ FC1500-ULNplus: Ultra-low noise, transfers stability like a boss (10⁻¹⁹ level!). ⚙️ Mid-IR Comb: Figure 9® tech unlocks fingerprint region for high-precision spectroscopy. ⚙️ FC1000: Compact, portable, perfect for on-the-go frequency metrology. ⚙️ SmartComb: 19" powerhouse, automated comb for 14-digit frequency with just a laser input. ⚙️FC1500-ULNnova: Redesigned core for ultimate robustness and reduced noise. #optics #frequencycombs #metrology #highprecision #technology #optics #photonics https://lnkd.in/gCFzhgzf

Require high flexibility and features smaller than 2 µm? Learn all about the Maskless Direct Imager VPG300 DI by Heidelberg Instruments! The VPG 300 DI is a Volume Pattern Generator specially designed for direct writing high-resolution microstructures in i-line resists. Derived from the mask making tool, it features all advanced VPG+ system components to be able to write with the highest precision and accuracy. The maximum write area covers a 300 mm wafer. More Here: https://bit.ly/3S3SOEz #lithography #2Dmaterials #3Dmaterials #photonics #nanofluidics #spintronics #grayscale #directwrite #laserlithography #quantum computing #nanofabrication #nanovacuum #heidelberginstruments

Extremely interesting and perfect timing in the publishing, with the new breaking news all the time of new signals found coming space, xref the possible of utilizing this as a communication variable .

🔬 Excited to share that our latest research titled "Polymer-based three-waveguide polarization beam splitter with reduced crosstalk for optical circuitry" has been published in Applied Optics! 📚 Our study addresses critical crosstalk challenges in optical circuitry by introducing an additional (bridge) waveguide solution, significantly reducing unwanted signal interference.💡 Moreover, we've achieved higher efficiency and minimized insertion and coupling losses for polarized light transmission. 🌟 Check out the full paper here: https://lnkd.in/guYnbnV5 #Research #OpticalEngineering #PolymerMaterial #Innovation #Photonics

As devices become increasingly miniaturized, precise local characterization of thin films is essential. Ellipsometry, with its non-contact, high-resolution capabilities, is vital for measuring film thickness and refractive indices down to 1 angstrom. The Accurion EP4 Imaging Spectroscopic Ellipsometer advances these capabilities by integrating ellipsometry with optical microscopy. It delivers 0.01 nm vertical and 1 µm lateral resolution, enabling comprehensive 2D imaging and the simultaneous measurement of over 300,000 points. This allows for detailed analysis of micron-sized features and local variations. The EP4 supports a wide range of applications, including 2D material characterization, photonics, semiconductor wafer quality control, and battery research. To learn more about the details of Accurion EP4: 🌐 https://okt.to/IV6u8s Watch the video on youtube: 🌐 https://okt.to/YSFODy #ThinFilm #ImagingSpectroscopicEllipsometry #AccurionEP4 #Nanotechnology #Research

Looking for photonic chips? ALUVIA Photonics offers a thin Al2O3 Multi Project Wafer run for UV-VIS applications and a thick Al2O3MPW for near-IR applications. Think of photonic chip applications for quantum technology, life sciences, telecommunications, amplifiers, lasers, and sensing. This is a great opportunity to have access to affordable, low-loss photonics chips on a novel material platform with a broad operating spectral window ranging from 200 nm to the mid-IR (~3 um). Furthermore, this platform has the possibility of optical amplification by rare-earth ion doping of the material. Interested? Subscribe at https://lnkd.in/e626penq. Mask submission deadline is 20 June. Too early? No worries, ALUVIA Photonics does an MPW run every quarter, and your next opportunity runs until August 31. #PhotonicChips #AluviaPhotonics #PhotonDeltaPartner