scholarly journals The Single-mode Complex Amplitude Refinement (SCAR) coronagraph

2020 ◽  
Vol 635 ◽  
pp. A56 ◽  
Author(s):  
S. Y. Haffert ◽  
E. H. Por ◽  
C. U. Keller ◽  
M. A. Kenworthy ◽  
D. S. Doelman ◽  
...  
Keyword(s):  
Focal Plane ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Solar Neighborhood ◽  
Phase Plate ◽  
Promising Technique ◽  
Fiber Array ◽  
Dark Region ◽  
Tilt Stability ◽  
Central Obscuration

We present the monochromatic lab verification of the newly developed SCAR coronagraph that combines a phase plate (PP) in the pupil with a microlens-fed single-mode fiber array in the focal plane. The two SCAR designs that have been measured, create respectively a 360 degree and 180 degree dark region from 0.8–2.4λ∕D around the star. The 360 SCAR has been designed for a clear aperture and the 180 SCAR has been designed for a realistic aperture with central obscuration and spiders. The 360 SCAR creates a measured stellar null of 2–3 × 10−4, and the 180 SCAR reaches a null of 1 × 10−4. Their monochromatic contrast is maintained within a range of ±0.16λ∕D peak-to-valley tip-tilt, which shows the robustness against tip-tilt errors. The small inner working angle and tip-tilt stability makes the SCAR coronagraph a very promising technique for an upgrade of current high-contrast instruments to characterize and detect exoplanets in the solar neighborhood.

Extremely Low-Profile Single Mode Fiber Array Coupler Suitable for Silicon Photonics

2019 ◽  
Author(s):  
Mitsuharu Hirano ◽  
Akira Furuya ◽  
Hideki Machida ◽  
Koichi Koyama ◽  
Yasunori Murakami ◽  
...  
Keyword(s):  
Silicon Photonics ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Fiber Array ◽  
Low Profile

Solder-reflowable single-mode fiber array photonics assembly in high-throughput manufacturing facilities

2019 ◽  
Author(s):  
Alexander Janta-Polczynski ◽  
Elaine Cyr ◽  
Richard Langlois ◽  
Paul Fortier ◽  
Yoichi Taira ◽  
...  
Keyword(s):  
High Throughput ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Fiber Array ◽  
Manufacturing Facilities

U-Groove Assisted Passive Assembly of 30x Single-Mode Fiber Array to Edge Couplers for Silicon Photonics

2021 ◽  
Author(s):  
Junwen He ◽  
Guy Lepage ◽  
Ozan Yilmaz ◽  
Peter Verheyen ◽  
Andy Miller ◽  
...  
Keyword(s):  
Silicon Photonics ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Fiber Array

scholarly journals High-speed, multicolor, structured illumination microscopy using a hexagonal single mode fiber array

2020 ◽  
Author(s):  
Taylor A. Hinsdale ◽  
Sjoerd Stallinga ◽  
Bernd Rieger
Keyword(s):  
High Speed ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Pattern Generation ◽  
Frame Rate ◽  
Structured Illumination ◽  
Structured Illumination Microscopy ◽  
Fiber Array ◽  
Coupling Laser ◽  
Programmable Devices

Structured Illumination Microscopy (SIM) is a widely used imaging technique that doubles the effective resolution of widefield microscopes. Most current implementations rely on diffractive elements, either gratings or programmable devices, to generate structured light patterns in the sample. These can be limited by spectral efficiency, speed, or both. Here we introduce the concept of fiber SIM which allows for camera frame rate limited pattern generation and manipulation over a broad wavelength range. Illumination patterns are generated by coupling laser beams into radially opposite pairs of fibers in a hexagonal single mode fiber array where the exit beams are relayed to the microscope objective’s back focal plane. The phase stepping and rotation of the illumination patterns are controlled by fast electro-optic devices. We achieved a rate of 111 SIM frames per second and imaged with excitation patterns generated by both 488 nm and 532 nm lasers.

Elimination of Self-Contamination in High-Density Low-Loss Single-Mode Fiber Array Connectors

2004 ◽  
Vol 22 (1) ◽  
pp. 24-28 ◽  
Author(s):  
G. Nykolak ◽  
G. Wilder ◽  
L. Eskildsen ◽  
N. Patel ◽  
T. Strasser ◽  
...  
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
High Density ◽  
Low Loss ◽  
Fiber Array

Pluggable Single-Mode Fiber-Array-to-PIC Coupling Using Micro-Lenses

2017 ◽  
Vol 29 (22) ◽  
pp. 1943-1946 ◽  
Author(s):  
Carmelo Scarcella ◽  
Kamil Gradkowski ◽  
Lee Carroll ◽  
Jun-Su Lee ◽  
Matthieu Duperron ◽  
...  
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Fiber Array

scholarly journals An Off-Axis Differential Method for Improvement of a Femtosecond Laser Differential Chromatic Confocal Probe

2020 ◽  
Vol 10 (20) ◽  
pp. 7235
Author(s):  
Chong Chen ◽  
Yuki Shimizu ◽  
Ryo Sato ◽  
Hiraku Matsukuma ◽  
Wei Gao
Keyword(s):  
Femtosecond Laser ◽  
Focal Plane ◽  
Signal To Noise Ratio ◽  
Single Mode ◽  
Measurement Range ◽  
Single Mode Fiber ◽  
Differential Method ◽  
Laser Source ◽  
Dual Detector ◽  
Chromatic Confocal Probe

This paper presents an off-axis differential method for the improvement of a femtosecond laser differential chromatic confocal probe having a dual-detector configuration. In the proposed off-axis differential method employing a pair of single-mode fiber detectors, a major modification is made to the conventional differential setup in such a way that the fiber detector in the reference detector is located at the focal plane of a collecting lens but with a certain amount of off-axis detector shift, while the fiber detector in the measurement detector is located on the rear focal plane without the off-axis detector shift; this setup is different from the conventional one where the difference between the two confocal detectors is provided by giving a defocus to one of the fiber detectors. The newly proposed off-axis differential method enables the differential chromatic confocal setup to obtain the normalized chromatic confocal output with a better signal-to-noise ratio and approaches a Z-directional measurement range of approximately 46 μm, as well as a measurement resolution of 20 nm, while simplifying the optical alignments in the differential chromatic confocal setup, as well as the signal processing through eliminating the complicated arithmetic operations in the determination of the peak wavelength. Numerical calculations based on a theoretical equation and experiments are carried out to verify the feasibility of the proposed off-axis differential method for the differential chromatic confocal probe with a mode-locked femtosecond laser source.

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