Results 51 to 60 of about 333 (144)
Ultra‐Compact Low‐Loss 3D Glass Waveguide Chip Using Femtosecond Laser Writing Technique
Advanced Photonics Research, Volume 7, Issue 6, June 2026.An ultra‐compact, low‐loss fan‐in/fan‐out device for 4‐core fiber is demonstrated using femtosecond laser direct writing. Multi‐scan and overwriting methods are employed to produce low‐loss waveguides. A trench‐assisted offset‐assisted cosine‐shaped model is proposed to reduce bending loss.
Fengrui Yu +5 more
wiley +1 more source
DELVE 6: An Ancient, Ultra-faint Star Cluster on the Outskirts of the Magellanic Clouds
The Astrophysical Journal Letters, 2023 We present the discovery of DELVE 6, an ultra-faint stellar system identified in the second data release of the DECam Local Volume Exploration (DELVE) survey. Based on a maximum-likelihood fit to its structure and stellar population, we find that DELVE 6
W. Cerny +26 more
doaj +1 more source
Laser &Photonics Reviews, Volume 18, Issue 11, November 2024.A triangular cross‐section multimode interference (MMI) coupler, supplemented with S‐bends and adiabatic tapers, is developed for splitting a signal from a single‐core fiber into four cores of a multi‐core fiber. The fabricated proof‐of‐concept splitter features a remarkably short length of 180 µm and insertion loss of around ‐3 dB.
Tigran Baghdasaryan +4 more
wiley +1 more source
Trimming laser-written waveguides through overwriting [PDF]
, 2020 Femtosecond laser direct writing is widely used to create waveguide circuits for optical processing in applications including communications, astrophotonics, simulation and quantum information processing. The properties of these waveguide circuits can be
core +1 more source
The Astrophysical Journal, 2022 SN 2018ivc is an unusual Type II supernova (SN II). It is a variant of SNe IIL, which might represent a transitional case between SNe IIP with a massive H-rich envelope and SNe IIb with only a small amount of the H-rich envelope.
Keiichi Maeda +17 more
doaj +1 more source
Carnegie Supernova Project. II. Near-infrared Spectral Diversity and Template of Type Ia Supernovae
The Astrophysical Journal, 2023 We present the largest and most homogeneous collection of near-infrared (NIR) spectra of Type Ia supernovae (SNe Ia): 339 spectra of 98 individual SNe obtained as part of the Carnegie Supernova Project-II.
Jing Lu +32 more
doaj +1 more source
The Astrophysical Journal, 2023 Early optical observations of gamma-ray bursts can significantly contribute to the study of the central engine and physical processes therein. However, of the thousands observed so far, only a few have data at optical wavelengths in the first minutes ...
Zi-Pei Zhu +23 more
doaj +1 more source
The Early Light Curve of SN 2023bee: Constraining Type Ia Supernova Progenitors the Apian Way
The Astrophysical Journal Letters, 2023 We present very early photometric and spectroscopic observations of the Type Ia supernova (SN Ia) 2023bee, starting about 8 hr after the explosion, which reveal a strong excess in the optical and nearest UV ( U and UVW1 ) bands during the first several ...
Griffin Hosseinzadeh +41 more
doaj +1 more source
The Astrophysical Journal, 2023 SN 2018aoz is a Type Ia SN with a B -band plateau and excess emission in infant-phase light curves ≲1 day after the first light, evidencing an over-density of surface iron-peak elements as shown in our previous study.
Yuan Qi Ni +42 more
doaj +1 more source
Astronomical photonics in the context of infrared interferometry and high-resolution spectroscopy
, 2016 We review the potential of Astrophotonics, a relatively young field at the interface between photonics and astronomical instrumentation, for spectro-interferometry.
Stefano Minardi +27 more
core +1 more source