Continuous-wave millimeter wave generation at 94 GHz in a lithium niobate nonlinear optical waveguide using modulated optical input

2003 ◽  
Vol 83 (11) ◽  
pp. 2133-2135 ◽  
Author(s):  
Toshihiro Hori ◽  
Ki-Hwan Park
Keyword(s):  
Lithium Niobate ◽  
Optical Waveguide ◽  
Millimeter Wave ◽  
Nonlinear Optical ◽  
Continuous Wave ◽  
Wave Generation

Generation of CW Millimeter Wave Signals in a Lithium Niobate Nonlinear Optical Waveguide Using Modulated Optical Input

2000 ◽  
Vol 39 (Part 2, No. 7A) ◽  
pp. L667-L669 ◽  
Author(s):  
Toshihiro Hori ◽  
Ki-Hwan Park ◽  
Tetsuya Kawanishi ◽  
Masayuki Izutsu
Keyword(s):  
Lithium Niobate ◽  
Optical Waveguide ◽  
Millimeter Wave ◽  
Nonlinear Optical

scholarly journals A low-noise photonic heterodyne synthesizer and its application to millimeter-wave radar

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Eric A. Kittlaus ◽  
Danny Eliyahu ◽  
Setareh Ganji ◽  
Skip Williams ◽  
Andrey B. Matsko ◽  
...  
Keyword(s):  
Phase Noise ◽  
Millimeter Wave ◽  
Continuous Wave ◽  
Dynamic Range ◽  
Wave Generation ◽  
Low Noise ◽  
Ultra Wideband ◽  
Optical Systems ◽  
Thz Spectroscopy ◽  
Wave Radar

AbstractMicrowave photonics offers transformative capabilities for ultra-wideband electronic signal processing and frequency synthesis with record-low phase noise levels. Despite the intrinsic bandwidth of optical systems operating at ~200 THz carrier frequencies, many schemes for high-performance photonics-based microwave generation lack broadband tunability, and experience tradeoffs between noise level, complexity, and frequency. An alternative approach uses direct frequency down-mixing of two tunable semiconductor lasers on a fast photodiode. This form of optical heterodyning is frequency-agile, but experimental realizations have been hindered by the relatively high noise of free-running lasers. Here, we demonstrate a heterodyne synthesizer based on ultralow-noise self-injection-locked lasers, enabling highly-coherent, photonics-based microwave and millimeter-wave generation. Continuously-tunable operation is realized from 1-104 GHz, with constant phase noise of -109 dBc/Hz at 100 kHz offset from carrier. To explore its practical utility, we leverage this photonic source as the local oscillator within a 95-GHz frequency-modulated continuous wave (FMCW) radar. Through field testing, we observe dramatic reduction in phase-noise-related Doppler and ranging artifacts as compared to the radar’s existing electronic synthesizer. These results establish strong potential for coherent heterodyne millimeter-wave generation, opening the door to a variety of future applications including high-dynamic range remote sensing, wideband wireless communications, and THz spectroscopy.

Investigating the Nonlinear Optical Response of Pepper Oil under Low Power Irradiation with Continuous Wave Visible Laser Beam

2020 ◽  
pp. 131-138
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Nonlinear Optical ◽  
Continuous Wave ◽  
Diffraction Integral ◽  
Visible Laser ◽  
Limiting Property ◽  
Kirchhoff Diffraction Integral ◽  
Theoretical Results ◽  
Good Agreement

The nonlinear optical properties of pepper oil are studied by diffraction ring patterns and Z-scan techniques with continuous wave beam from solid state laser at 473 nm wavelength. The nonlinear refractive index of the sample is calculated by both techniques. The sample show high nonlinear refractive index. Based on Fresnel-Kirchhoff diffraction integral, the far-field intensity distributions of ring patterns have been calculated. It is found that the experimental results are in good agreement with the theoretical results. Also the optical limiting property of pepper oil is reported. The results obtained in this study prove that the pepper oil has applications in nonlinear optical devices.

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