A 22 GHz receiver with high phase stability for radioastron space-VLBI-mission

1994 ◽  
Vol 5 (3-4) ◽  
pp. 389-404
Author(s):  
Petri Piironen ◽  
Juha Mallat ◽  
Antti Räisänen ◽  
Petri Jukkala
Keyword(s):  
Phase Stability ◽  
High Phase

scholarly journals Phase stable swept-source optical coherence tomography with active mode-locking laser for contrast enhancements of retinal angiography

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kwan Seob Park ◽  
Eunwoo Park ◽  
Hwidon Lee ◽  
Hyun-Ji Lee ◽  
Sang-Won Lee ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Phase Stability ◽  
Averaging Method ◽  
Mode Locking ◽  
Optical Coherence ◽  
Swept Source ◽  
Active Mode ◽  
Coherent Averaging ◽  
Noise Ratio ◽  
High Phase

AbstractSwept-source optical coherence tomography (SS-OCT) is an attractive high-speed imaging technique for retinal angiography. However, conventional swept lasers vary the cavity length of the laser mechanically to tune the output wavelength. This causes sweep-timing jitter and hence low phase stability in OCT angiography. Here, we improve an earlier phase-stabilized, akinetic, SS-OCT angiography (OCTA) method by introducing coherent averaging. We develop an active mode-locking (AML) laser as a high phase-stable akinetic swept source for the OCTA system. The phase stability of the improved system was analyzed, and the effects of coherent averaging were validated using a retina phantom. The effectiveness of the coherent averaging method was further confirmed by comparing coherently and conventionally averaged en face images of human retinal vasculature for their contrast-to-noise ratio, signal-to-noise ratio, and vasculature connectivity. The contrast-to-noise ratio was approximately 1.3 times larger when applying the coherent averaging method in the human retinal experiment. Our coherent averaging method with the high phase-stability AML laser source for OCTA provides a valuable tool for studying healthy and diseased retinas.

scholarly journals Coherence‐Tailored Multiwavelength High‐Speed Quantitative Phase Imaging with a High Phase Stability via a Frequency Comb

2020 ◽  
pp. 2000088
Author(s):  
Jeeranan Boonruangkan ◽  
Hamid Farrokhi ◽  
Thazhe Madam Rohith ◽  
Hui Ting Toh ◽  
Abhinay Mishra ◽  
...  
Keyword(s):  
Phase Stability ◽  
High Speed ◽  
Frequency Comb ◽  
Phase Imaging ◽  
Quantitative Phase Imaging ◽  
Quantitative Phase ◽  
High Phase

scholarly journals A high phase stability transmitter clock domain design

2019 ◽  
Vol 1325 ◽  
pp. 012059
Author(s):  
Wenliang Zhao ◽  
Shengming Liang ◽  
Zhiyong Wang ◽  
Kang Wang
Keyword(s):  
Phase Stability ◽  
High Phase

scholarly journals Solar Cells: High Phase Stability in CsPbI 3 Enabled by Pb–I Octahedra Anchors for Efficient Inorganic Perovskite Photovoltaics (Adv. Mater. 24/2020)

2020 ◽  
Vol 32 (24) ◽  
pp. 2070185 ◽  
Author(s):  
Yong Wang ◽  
Gaoyuan Chen ◽  
Dan Ouyang ◽  
Xinjun He ◽  
Can Li ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Stability ◽  
Inorganic Perovskite ◽  
High Phase

An S-band high gain relativistic klystron amplifier with high phase stability

2014 ◽  
Vol 21 (11) ◽  
pp. 113107 ◽  
Author(s):  
Y. Wu ◽  
Z. H. Li ◽  
H. Q. Xie ◽  
Z. Xu ◽  
Q. S. Ma
Keyword(s):  
Phase Stability ◽  
High Gain ◽  
Relativistic Klystron ◽  
High Phase

scholarly journals A Novel Bulk-Optics Scheme for Quantum Walk with High Phase Stability

2019 ◽  
Vol 4 (1) ◽  
pp. 14 ◽  
Author(s):  
Andrea Geraldi ◽  
Luís Bonavena ◽  
Carlo Liorni ◽  
Paolo Mataloni ◽  
Álvaro Cuevas
Keyword(s):  
Phase Stability ◽  
Closed Loop ◽  
Lattice Structure ◽  
Quantum Walk ◽  
Quantum Walks ◽  
Phase Component ◽  
Dimensional Lattice ◽  
One Dimensional ◽  
Experimental Implementation ◽  
High Phase

A novel bulk optics scheme for quantum walks is presented. It consists of a one-dimensional lattice built on two concatenated displaced Sagnac interferometers that make it possible to reproduce all the possible trajectories of an optical quantum walk. Because of the closed loop configuration, the interferometric structure is intrinsically stable in phase. Moreover, the lattice structure is highly configurable, as any phase component perceived by the walker is accessible, and finally, all output modes can be measured at any step of the quantum walk evolution. We report here on the experimental implementation of ordered and disordered quantum walks.

Influence of Two-Step Sintering Variables on Phase Stability of Hydrothermally Prepared HAp Nano Powders

2007 ◽  
Vol 361-363 ◽  
pp. 91-94 ◽  
Author(s):  
In Young Ryu ◽  
Dae Joon Kim ◽  
Jung Suk Han ◽  
Myung Hyun Lee
Keyword(s):  
Heating Rate ◽  
Phase Stability ◽  
Initial Temperature ◽  
Elevated Temperatures ◽  
Powder Processing ◽  
Processing Condition ◽  
High Density ◽  
Final Temperature ◽  
Fine Microstructure ◽  
High Phase

Two-step sintering was performed to prepare hydroxyapatite (HAp) with a high density and a fine microstructure utilizing hydrothermally synthesized nano powders. Its effectiveness was dependent on starting chemicals for precursors of HAp, powder processing condition, initial temperature in the two-step sintering, heating rate to the initial temperature, and holding time at final temperature. HAp powder, hydrothermally treated after aging of precipitate of Ca(OH)2 and H3PO4 for 48 h, led to HAp having a high phase stability at elevated temperatures, a high density, and a fine microstructure after two-step sintering with heating rate of 10°C/min to 1275°C.

scholarly journals Phase Stability and Transport Properties of (ZrO2)0.91−x(Sc2O3)0.09(Yb2O3)x Crystals (x = 0–0.01)

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 83
Author(s):  
Mikhail Borik ◽  
Galina Korableva ◽  
Alexey Kulebyakin ◽  
Irina Kuritsyna ◽  
Nataliya Larina ◽  
...  
Keyword(s):  
High Temperature ◽  
Transport Properties ◽  
Phase Stability ◽  
Rf Heating ◽  
X Ray Diffraction ◽  
High Temperature Heat Treatment ◽  
Before And After ◽  
T Phase ◽  
High Phase

Phase stability and transport properties of (ZrO2)0.91−x(Sc2O3)0.09(Yb2O3)x crystals (x = 0–0.01) have been studied before and after air annealing at 1000 °C for 400 h. The crystals have been grown by radio frequency (RF) heating in a cold crucible. The microstructure, phase composition, and electrical conductivity of the crystals have been studied using optical microscopy, X-ray diffraction, Raman spectroscopy, and impedance spectroscopy. Phase stability and degradation of ionic conductivity of the crystals upon long-term high-temperature heat treatment have been discussed. We show that the stabilization of ZrO2 co-doped with 9 mol.% Sc2O3 and 1 mol.% Yb2O3 provides transparent uniform crystals with the pseudocubic t″ phase structure having high phase stability. Crystals of this composition had the highest conductivity in the entire temperature range. Long-term high-temperature annealing of these crystals did not lead to conductivity degradation.

Structured crystallization for efficient all-inorganic perovskite solar cells with high phase stability

2019 ◽  
Vol 7 (35) ◽  
pp. 20390-20397 ◽  
Author(s):  
Zhen Wang ◽  
Ajay K. Baranwal ◽  
Muhammad Akmal Kamarudin ◽  
Yusuke Kamata ◽  
Chi Huey Ng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Stability ◽  
Perovskite Solar Cells ◽  
Inorganic Perovskite ◽  
High Phase

Yttrium incorporation enhanced the performance of CsPbI2Br perovskite solar cells and the phase stability was improved significantly.

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