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Related Concept Videos

Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Series Resonance01:17

Series Resonance

The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
Aliasing01:18

Aliasing

Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original signal...

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Frequency comb from a microresonator with engineered spectrum.

Ivan S Grudinin1, Lukas Baumgartel, Nan Yu

  • 1Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, USA. grudinin@jpl.nasa.gov

Optics Express
|March 16, 2012
PubMed
Summary
This summary is machine-generated.

Researchers control optical comb generation by tuning resonator properties. This allows for broader bandwidths using significantly lower pump power, advancing frequency comb technology.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Whispering gallery mode resonators are key for nonlinear optics.
  • Generating broadband optical frequency combs requires precise control over resonator parameters.

Purpose of the Study:

  • To demonstrate control over optical comb generation by tuning the linewidth and dispersion ratio in a whispering gallery mode resonator.
  • To achieve broadband optical frequency combs with significantly reduced pump power.

Main Methods:

  • Fabrication and characterization of magnesium fluoride (MgF₂) whispering gallery mode resonators.
  • Systematic variation of the resonator's linewidth and dispersion.
  • Optical pumping experiments at 1560 nm with varying power levels.

Main Results:

  • Successfully controlled the number of free spectral ranges (N) between generated comb sidebands and the pump, observing N=19 and N=1.
  • Achieved an optical comb span exceeding 200 nm with N=1 using a 0.4 mm MgF₂ resonator.
  • Demonstrated this broadband comb generation using only 50 mW of pump power, a tenfold reduction compared to previous studies.

Conclusions:

  • The ratio of linewidth to dispersion in whispering gallery mode resonators is a critical parameter for controlling optical comb generation.
  • Low-power, broadband optical frequency comb generation is achievable with optimized resonator designs.
  • This work offers a more efficient pathway for developing compact and powerful frequency comb sources.