scholarly journals IMPACT OF THE IMPERFECT POLARIZING-BEAM SPLITTER AND QUARTER-WAVE PLATE AND NON-IDEAL LASER BEAM ON THE ACCURACY OF NANO-DISPLACEMENT LASER ENCODER

2017 ◽  
Vol 1 (2) ◽  
Keyword(s):  
Laser Beam ◽  
Beam Splitter ◽  
Quarter Wave Plate ◽  
Wave Plate ◽  
Quarter Wave ◽  
Polarizing Beam Splitter

Passband-Flattened Frequency-Tunable Optical Fiber Multiwavelength Filter with Composite Combination of Waveplates

2021 ◽  
Vol 21 (8) ◽  
pp. 4200-4207
Author(s):  
Jaehoon Jung ◽  
Yong Wook Lee
Keyword(s):  
Beam Splitter ◽  
Orientation Angle ◽  
Quarter Wave Plate ◽  
Half Wave Plate ◽  
Wave Plate ◽  
Half Wave ◽  
Quarter Wave ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Frequency Tunable

We propose a passband-flattened frequency-tunable optical multiwavelength filter with a composite combination of waveplates, which is realized by harnessing a polarization-diversified loop structure. The proposed filter comprises a polarization beam splitter (PBS), two polarization-maintaining fiber (PMF) segments of equal length, an ordered waveplate combination (OWC) of a half-wave plate (HWP) and a quarter-wave plate (QWP) before the first PMF segment, and an OWC of a QWP and an HWP before the second PMF segment. The second PMF segment is butt-coupled to one port of the PBS so that its slow axis is oriented at 22.5° for the horizontal axis of the PBS. Based on the filter transmittance derived through the Jones calculus, we found the orientation angle (OA) sets of the four waveplates, which could induce an extra phase shift Φ from 0° to 360° in the passband-flattened transmittance function. From the transmission spectra calculated at the eight selected OA sets, which caused Φ to increase from 0° to 315° by steps of 45°, it was confirmed that the passband-flattened multiwavelength spectrum can be continuously tuned by properly controlling the OAs. This indicates continuous wavelength tunability based on composite OWCs. Then, this theoretical prediction was verified by experimental demonstration.

Application of Laser Doppler Technique in Measurement of Explosive Container Based on Frequency Correction

2013 ◽  
Vol 391 ◽  
pp. 497-500
Author(s):  
Hong Li Liu ◽  
Lei Shao ◽  
Hai Bin Zuo ◽  
Nan Liu
Keyword(s):  
Processing Speed ◽  
Beam Splitter ◽  
Correction Method ◽  
Laser Doppler ◽  
Quarter Wave Plate ◽  
Wave Plate ◽  
Half Wave ◽  
Frequency Correction ◽  
Quarter Wave ◽  
Short Time

Dynamic measurement of explosion containment vessel deformation for explosive experiment is obtained using laser doppler effect. The system is based on optical heterodyning technologies, and uses half wave plate, quarter wave plate, polarization beam splitter and acousto-optic modulator to improve the intensity of doppler signal and signal-noise-ratio. Short time fourier transform and energy centrobaric correction method using hamming window is applied to improve the signal processing speed and the accuracy. The experimental results of explosive container are presented under 20g TNT explosion.

scholarly journals A full-Stokes polarimeter for the GREGOR Fabry-Perot interferometer

2008 ◽  
Vol 4 (S259) ◽  
pp. 665-666 ◽  
Author(s):  
Horst Balthasar ◽  
N. Bello González ◽  
M. Collados ◽  
C. Denker ◽  
A. Hofmann ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Beam Splitter ◽  
Quarter Wave Plate ◽  
Ferroelectric Liquid Crystals ◽  
Wave Plate ◽  
Half Wave ◽  
Fabry Perot ◽  
Quarter Wave ◽  
Optimum Wavelength ◽  
High Cadence

AbstractOne of the first post-focus instruments of the new solar telescope GREGOR will be a Fabry-Perot spectrometer, which is an upgrade of the Göttingen Fabry-Perot interferometer at the Vacuum Tower Telescope (VTT) on Tenerife. This spectrometer is equipped with a full-Stokes polarimeter. The modulation is performed with two ferroelectric liquid crystals, one acting nominally as quarter-wave plate, and the other as half-wave plate. A modified Savart plate serves as polarimetric beam splitter. With the present liquid crystals, the optimum wavelength range of this polarimeter is between 580 and 660 nm. The spectro-polarimeter will benefit from the capabilities of the new telescope GREGOR which will provide a spatial resolution of about 0″.1 (75 km on the solar surface). Thus we will be able to investigate small magnetic features, and we will study their development with high cadence.

scholarly journals None sharp corner localized surface plasmons resonance based ultrathin metasurface single layer quarter wave plate

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Qinyu Qian ◽  
Pengfei Liu ◽  
Li Fan ◽  
Liang Zhao ◽  
Chinhua Wang
Keyword(s):  
Surface Plasmons ◽  
Amplitude Ratio ◽  
Single Layer ◽  
Quarter Wave Plate ◽  
Localized Surface Plasmons ◽  
Sharp Corner ◽  
Wave Plate ◽  
Nanophotonic Devices ◽  
Elliptical Ring ◽  
Quarter Wave

AbstractWe report on a non-sharp-corner quarter wave plate (NCQW) within the single layer of only 8 nm thickness structured by the Ag hollow elliptical ring array, where the strong localized surface plasmons (LSP) resonances are excited. By manipulating the parameters of the hollow elliptical ring, the transmitted amplitude and phase of the two orthogonal components are well controlled. The phase difference of π/2 and amplitude ratio of 1 is realized simultaneously at the wavelength of 834 nm with the transmission of 0.46. The proposed NCQW also works well in an ultrawide wavelength band of 110 nm, which suggests an efficient way of exciting LSP resonances and designing wave plates, and provides a great potential for advanced nanophotonic devices and integrated photonic systems.

scholarly journals Switchable Ultrathin Quarter-wave Plate in Terahertz Using Active Phase-change Metasurface

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Dacheng Wang ◽  
Lingchao Zhang ◽  
Yinghong Gu ◽  
M. Q. Mehmood ◽  
Yandong Gong ◽  
...  
Keyword(s):  
Phase Change ◽  
Active Phase ◽  
Quarter Wave Plate ◽  
Wave Plate ◽  
Quarter Wave

Quarter-wave plate tunable in a wide wavelength range

1995 ◽  
Vol 25 (2) ◽  
pp. 187-190 ◽  
Author(s):  
I V Gol'tser ◽  
M Ya Darsht ◽  
Boris Ya Zel'dovich ◽  
N D Kundikova ◽  
L F Rogacheva
Keyword(s):  
Wavelength Range ◽  
Quarter Wave Plate ◽  
Wave Plate ◽  
Wide Wavelength Range ◽  
Quarter Wave
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