optical phase
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2022 ◽  
Vol 149 ◽  
pp. 107829
Ning Ren ◽  
Bin Zhao ◽  
Bo Liu ◽  
Kangjian Hua

Ondrej Votava ◽  
Samir Kassi ◽  
Alain Campargue ◽  
Daniele Romanini

Comb Coherence Transfer (CCT) uses a feed-forward frequency correction to transfer the optical phase of a frequency comb to the beam of a free-running diode laser. This allows to amplify...

Nano Letters ◽  
2021 ◽  
Ivo Tanghe ◽  
Justinas Butkus ◽  
Kai Chen ◽  
Ronnie R. Tamming ◽  
Shalini Singh ◽  

Tipat Piyapatarakul ◽  
Hanzhi Tang ◽  
Kasidit Toprasertpong ◽  
Shinichi TAKAGI ◽  

Abstract We propose an optical phase modulator with a hybrid metal-oxide-semiconductor (MOS) capacitor, consisting of single-layer graphene and III-V semiconductor waveguide. The proposed modulator is numerically analyzed in conjunction with the surface conductivity model of graphene. Since the absorption of graphene at a 2 µm wavelength can be suppressed by modulating the chemical potential of graphene with the practical gate bias, the phase modulation efficiency is predicted to be 0.051 V·cm with a total insertion loss of 0.85 dB when an n-InGaAs waveguide is used, showing the feasibility of the low-loss, high-efficiency graphene/III-V hybrid MOS optical phase modulator, which is useful in the future 2-µm optical fiber communication band.

2021 ◽  
Viacheslav Mazlin ◽  
Peng Xiao ◽  
Kristina Irsch ◽  
Jules Scholler ◽  
Kassandra Groux ◽  

2021 ◽  
Vol 163 (1) ◽  
pp. 5
Roderick De Cock ◽  
Timothy A. Livengood ◽  
Daphne M. Stam ◽  
Carey M. Lisse ◽  
Tilak Hewagama ◽  

Abstract NASA’s EPOXI mission used the Deep Impact spacecraft to observe the disk-integrated Earth as an analog to terrestial exoplanets’ appearance. The mission took five 24 hr observations in 2008–2009 at various phase angles (57.°7–86.°4) and ranges (0.11–0.34 au), of which three equatorial (E1, E4, E5) and two polar (P1, North and P2, South). The visible data taken by the HRIV instrument ranges from 0.3 to 1.0 μm, taken trough seven spectral filters that have spectral widths of about 100 nm, and which are centered about 100 nm apart, from 350 to 950 nm. The disk-integrated, 24 hr averaged signal is used in a phase angle analysis. A Lambertian-reflecting, spherical planet model is used to estimate geometric albedo for every observation and wavelength. The geometric albedos range from 0.143 (E1, 950 nm) to 0.353 (P2, 350 nm) and show wavelength dependence. The equatorial observations have similar values, while the polar observations have higher values due to the ice in view. Therefore, equatorial observations can be predicted for other phase angles, but (Earth-like) polar views (with ice) would be underestimated.

2021 ◽  
pp. 127685
A. Quiroz ◽  
David-Ignacio Serrano-Garcia ◽  
G. Reséndiz López ◽  
A. Monzalvo Hernández ◽  
L. García-Lechuga ◽  

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