Optical microcavity

About: Optical microcavity is a research topic. Over the lifetime, 2599 publications have been published within this topic receiving 72125 citations. The topic is also known as: optical microcavities.

Effect of detuning on the angular emission pattern of high-efficiency microcavity light-emitting diodes

Abstract: Results on molecular beam epitaxy-grown microcavity light-emitting diodes with InGaAs/GaAs quantum wells and a hybrid top mirror are presented. An external quantum efficiency of 14.8% is achieved for a 400 μm diam light-emitting diode. The strong influence of the spectral overlap between the spontaneous emission spectrum and the cavity resonance mode on the radiation pattern is shown. The angular emission profile is compared with model predictions for different detunings, and a very good agreement is obtained when the asymmetric spectral broadening of the intrinsic spontaneous emission is taken into account.

Optimal third-harmonic generation in an optical microcavity with χ (2) and χ (3) nonlinearities

Abstract: Third-harmonic generation can be realized via both χ(3) and cascaded χ(2) nonlinear processes in a triply-resonant microcavity. It is still unknown how these processes interfere with each other and the optimization of the conversion efficiency still remains as a question. In this work, the interplay between the direct third-harmonic generation and the cascaded process combining of the second-harmonic generation and the sum-frequency generation are investigated. It is found that the interference effect between these two processes can be used to improve the conversion efficiency. By optimizing the cavity resonance and the external coupling conditions, the saturation of the nonlinear conversion is mitigated and the third-harmonic conversion efficiency is increased. A design rule is provided for achieving efficient third-harmonic generation in an optical microcavity, which can be generalized further to the high-order harmonic generations.

Quantum wire microcavity laser made from gaas fractional layer superlattices

Abstract: We report the first demonstration of lasing action in a quantum wire microcavity semiconductor laser made from an array of (AlAs)1/4(GaAs)3/4 fractional‐layer superlattice (FLS) quantum wires. The FLS growth method produces uniform, densely packed, damage‐free arrays of nanometer‐size quantum wires which are integrated into an optical microcavity that is the size of the wavelength of the light. We obtain room temperature optically pumped lasing for wavelengths from 670 to 690 nm. The lasing output is linearly polarized parallel to the quantum wires, reflecting the higher optical gain for polarization direction parallel to the wires. The combination of a semiconductor quantum wire active material with an optical microcavity offers the possibility of ultimately compact, highly efficient laser sources.

External cavity laser source

Abstract: A multi-wavelength light source with a gain medium and an optical equalizer. The gain medium emits light of a plurality of wavelengths in response to pumping. The gain medium is disposed in an optical cavity that repetitively passes light through the gain medium. The optical cavity supports a plurality of different optical modes having wavelengths coinciding with the plurality of wavelengths emitted by the gain medium. The optical equalizer is also in the optical cavity. The optical equalizer adjusts the optical power of at least one of the different optical modes so as to provide more even optical power distribution among the optical modes propagating through the optical cavity.

Active reflection via a phase-insensitive quadratic nonlinear interaction within a microcavity

Abstract: The reflectivity of a microcavity filled with a quadratic nonlinear material is shown to be actively changed by the interaction of two waves. Within this microcavity, the reflection coefficient of a weak wave at the fundamental frequency is changed from almost 0% to a value in the vicinity of 100% by the simultaneous incidence of an intense wave at the second-harmonic frequency. This change in reflectivity is shown to be in a large degree insensitive to the input phase difference between the two waves.