We demonstrate a broadband and flat millimeter-wave (MMW) noise source based on the heterodyne of two Fabry-Perot lasers subject to optical feedback. Different mode intervals between two lasers are designed to generate beat terms at specific frequencies. As a proof-of-concept demonstration, a MMW noise signal with a 3-dB bandwidth of 50 GHz (limited by the measurement bandwidth) and flatness of less than 2.9 dB is experimentally achieved. The physical origination of the broadband flat MMW noise generation is analyzed, and the properties of the MMW signal are characterized. The proposed method has the potential to generate a broadband flat noise signal in the MMW or even the terahertz region.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OL.447656 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
In this Letter, we report an ultraflat high-power supercontinuum (SC) based on a low-loss short-length fluorotellurite fiber. A novel high-peak power dual-Raman soliton femtosecond laser is used as a pump source, which effectively extends the mid-infrared SC spectral range and enhances the flatness of the SC. Finally, we obtained a 10.
View Article and Find Full Text PDFLandau Rainbow Induced by Artificial Gauge Fields.
Phys Rev Lett
December 2024
New Cornerstone Science Laboratory, Department of Physics, University of Hong Kong, Hong Kong, China.
The ability to generate Landau levels using a pseudomagnetic field (PMF), also called an artificial gauge field, opens up new pathways for exploring fundamental physics and developing novel applications based on topological protection. In this Letter, we simultaneously realize a PMF and a pseudoelectric field (PEF) on a photonic crystal platform and observe a rainbow effect of the Landau zeroth modes. While a PMF induces a series of discretized Landau levels of photons in a similar way as the quantum Hall effect for electrons, a PEF breaks the degeneracy of the flat band of Landau levels over a broad range.
View Article and Find Full Text PDFThe dynamic range of non-coherent continuous-wave (CW) THz photomixing (PM) systems with broadband detectors can be significantly limited by various parasitic effects. Specifically, we examine the generation of parasitic (i) THz and (ii) IR radiation, and (iii) higher harmonics in CW THz PM emitters. (i) The parasitic broadband THz radiation, spanning from 100 to 250 GHz with a total output power of 20 nW, results from not perfectly clean laser spectra.
View Article and Find Full Text PDFRange versus frequency averaging of underwater propagation loss for soundscape modelinga).
J Acoust Soc Am
November 2024
JASCO Applied Sciences (Canada), Ltd., Dartmouth, Nova Scotia B2Y 4S3, Canada.
Guidance on efficient methods is needed for the practical application of modeling the sound field from broadband sources such as vessels, seismic surveys, and construction activities. These sound field models are employed for estimating how changes in the soundscape will affect marine life. For efficiency, acoustic propagation modeling is often performed in bands (decidecade or 13-octave), where propagation loss modeled for central frequency is assumed to represent an average propagation loss in the band.
View Article and Find Full Text PDFPlasmon, the collective oscillations of free electron gas in materials, determines the long-wavelength excitation spectrum and optical response, are pivotal in the realm of nanophotonics and optoelectronics. In this study, using the first-principles calculations, we systematically investigated the dielectric response and plasmon properties of bulk transition-metal monohalides MXs (M = Zr, Mo; X = Cl, F). Due to the strong electronic anisotropy, MXs exhibit a broadband type-II hyperbolic response and direction-dependent plasmon modes.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!