Distance-weighted reflectance for arbitrary source-detector geometries from a single pencil-beam Monte Carlo simulation [0.03%]
基于单一束流蒙特卡洛模拟的任意源探测器几何形状的距离加权反射率
Robin van Zutphen,Ton G van Leeuwen,Xavier Attendu
Robin van Zutphen
Modeling reflectance for finite source-detector geometries typically requires Monte Carlo simulations with explicit illumination and collection areas. We present a distance-weighted formulation that computes reflectance for arbitrary overla...
External electric field-induced melt deformations in laser-directed powder processing [0.03%]
外部电场对激光粉末床融合中熔池形貌的影响研究
Ankit Das,Shuichiro Hayashi,Craig B Arnold
Ankit Das
External electrical fields (EFs) provide a unique strategy to manipulate fluid deformations independently of thermal parameters. This offers a unique opportunity in laser processes involving melting, where melt pool responses can be complex...
Ziheng Shang,Junmeng Han,Xiaoyi Hao et al.
Ziheng Shang et al.
Laser active polarization imaging is susceptible to coherent speckle noise, which severely degrades both image quality and the accuracy of polarization parameter estimation. Existing polarimetric denoising methods, predominantly designed fo...
1048-nm dual-crystal Yb:CALGO regenerative amplifier aiming for a VUV source at 1-MHz repetition rate [0.03%]
一种双晶Yb:CALGO再生放大器用于产生高重频VUV光源
Zhaoshi Guo,Mengze Pei,Yuyuan Fan et al.
Zhaoshi Guo et al.
A high-power 1-MHz dual-crystal Yb:CALGO femtosecond regenerative amplifier (RA) is demonstrated with an average output power of 55 W, while featuring a carefully selected central wavelength of 1048 nm, whose third harmonic wave of 349 nm i...
Narrowband selection in a standing wave active fiber loop mirror for a single longitudinal mode L-band Er-doped fiber laser [0.03%]
窄线宽立管行波有源光纤环镜及单纵模L波段掺饵光纤激光器研究
Ekaterina K Kashirina,Ivan A Lobach,Sergey I Kablukov
Ekaterina K Kashirina
We demonstrate a simplified single longitudinal mode (SLM) L‑band erbium‑doped fiber laser using an active fiber loop mirror (AFLM). It requires no separate saturable absorber or circulator. Stable SLM operation is achieved with an output...
Ultra-high responsivity 4H-SiC floating-base phototransistors enabled by punch-through induced barrier lowering [0.03%]
穿通诱导势垒降低增强的高响应度4H-SiC浮基光电晶体管
Qunsi Yang,Yifu Wang,Xinghua Liu et al.
Qunsi Yang et al.
A 4H-SiC n-p-n floating-base phototransistor (FB-PT) achieving ultra-high responsivity via a punch-through induced barrier lowering (PT-IBL) mechanism is reported. By engineering the base region to operate near the structural punch-through ...
Coherence-multiplexed FMCW spectroscopy for long-distance multi-point gas sensing [0.03%]
用于长距离多点气体传感的相干复用FMCW光谱学
Ning Xu,Xiutao Lou,Baosen Tian et al.
Ning Xu et al.
We present a long-range, multi-point spectroscopic gas-sensing method that incorporates coherence multiplexing into optical frequency-modulated continuous-wave (FMCW) spectroscopy to significantly increase the sensing distance. In this meth...
Near-athermal silicon nitride 4-channel O-band (de)multiplexer with ~2 pm/K temperature sensitivity [0.03%]
一种近无热化硅氮薄膜四通道O波段复用/解复用器（温度系数约为2pm/K）
Shiqi Zhang,Donghao Li,Luyang Liu et al.
Shiqi Zhang et al.
We demonstrate a 4-channel O-band (de)multiplexer based on silicon nitride (SiN) Mach-Zehnder interferometer (MZI) lattice filters. By utilizing geometry-dependent modal behavior to tailor the effective thermo-optic coefficient (dneff/dT) o...
Jiacheng Zheng,Jingda Wen,Sen Hou et al.
Jiacheng Zheng et al.
Metasurfaces resolve limited signal-to-noise ratio (SNR) and radio frequency (RF) inhomogeneity bottlenecks in magnetic resonance imaging (MRI). However, strong unit-cell near-field coupling creates an "ill-posed"' design problem, where con...
Single-shot lensless dual-mode ultraviolet imaging based on diffuser speckle modulation [0.03%]
基于扩散器散斑调制的单次曝光无镜头紫外双模式成像方法
Jiaqi Song,Zi-Qing Zhao,Ming-Fei Li et al.
Jiaqi Song et al.
Ultraviolet (UV) imaging can reveal structural flaws, fluorescent markers, and characteristic signals generated by material changes that are difficult to detect in visible-light imaging and has been applied in numerous fields. However, in t...