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Related Concept Videos

LC Circuits01:21

LC Circuits

An LC circuit consists of an inductor and a capacitor, either in series or parallel. Consider a charged capacitor connected with an inductor in series. Before the switch is closed, all the energy of the circuit is stored in the electric field of the capacitor. When the switch is closed, the capacitor begins to discharge, producing a current in the circuit. The current, in turn, creates a magnetic field in the inductor. Because of the induced emf in the inductor, the current cannot change...
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
Resonance in an AC Circuit01:26

Resonance in an AC Circuit

The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...
RLC Series Circuits01:30

RLC Series Circuits

An RLC series circuit comprises an inductor, a resistor, and a charged capacitor connected in series. When the circuit is closed, the capacitor begins to discharge through the resistor and inductor by transferring energy from the electric field to the magnetic field. Here, the resistor connected to the circuit causes energy losses; therefore, on the complete discharge of the capacitor, the magnetic field energy acquired by the inductor is less than the original electric field energy of the...
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:
Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...

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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
09:10

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Purcell effect in the inductor-capacitor laser.

Christoph Walther1, Giacomo Scalari, Mattias Beck

  • 1Institute for Quantum Electronics, ETH Zurich, Wolfgang-Pauli-Strasse 16, 8093 Zurich, Switzerland.

Optics Letters
|July 19, 2011
PubMed
Summary
This summary is machine-generated.

The inductor-capacitor (LC) laser shows a large Purcell factor of 17, enhancing light emission. This study confirms theoretical predictions through experimental laser characteristics.

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Area of Science:

  • Photonics and optical engineering
  • Quantum optics
  • Nanoscale devices

Background:

  • Inductor-capacitor (LC) lasers offer strongly subwavelength mode volumes, enabling novel optical functionalities.
  • The Purcell effect, which enhances spontaneous emission rates in optical cavities, is crucial for laser performance.

Purpose of the Study:

  • To investigate and quantify the Purcell effect in inductor-capacitor (LC) laser resonators.
  • To theoretically compute the Purcell factor and experimentally validate its impact on laser characteristics.

Main Methods:

  • Theoretical computation of the average Purcell factor for the LC laser resonator.
  • Formulation and numerical solution of the laser rate equations specific to the LC laser.
  • Experimental comparison of the LC laser's threshold and emission properties with theoretical predictions.

Main Results:

  • An average Purcell factor of 17 was computed for the LC laser.
  • Experimental data on threshold and emission characteristics align with theoretical predictions incorporating the large Purcell factor.

Conclusions:

  • The study provides strong evidence for a significant Purcell effect in LC lasers.
  • The enhanced light-matter interaction due to the Purcell effect is critical for the performance of subwavelength LC lasers.