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Standing Waves in a Cavity

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis

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Continuous-wave sum-frequency generation in AlGaAs Bragg reflection waveguides.

Junbo Han¹, Payam Abolghasem, Bhavin J Bijlani

¹The Edward S. Rogers Sr. Department of Electrical and Computer Engineering, University of Toronto,10 King's College Road, Toronto, Ontario M5S 3G4, Canada.

|December 3, 2009

Summary

This summary is machine-generated.

Researchers achieved efficient sum-frequency generation in gallium arsenide/aluminum gallium arsenide waveguides. This nonlinear optical process upconverted photons, demonstrating a high normalized conversion efficiency for potential photonic applications.

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Area of Science:

Nonlinear optics
Integrated photonics
Semiconductor device physics

Background:

Sum-frequency generation (SFG) is a vital nonlinear optical process for frequency conversion.
Epitaxial waveguides offer enhanced light-matter interaction for nonlinear processes.
Gallium arsenide (GaAs) and aluminum gallium arsenide (AlGaAs) are key materials in integrated photonics.

Purpose of the Study:

To demonstrate efficient sum-frequency generation (SFG) in epitaxial GaAs/AlGaAs waveguides.
To achieve phase matching for type II nonlinear interaction using Bragg reflection waveguides.
To upconvert photons from the 1550 nm telecom window to the 775 nm region.

Main Methods:

Utilized continuous-wave (CW) pump and signal lasers operating at 1550 nm.
Employed Bragg reflection waveguides to achieve phase matching for type II nonlinear interaction.
Fabricated epitaxial GaAs/AlGaAs waveguide devices for sum-frequency generation.

Main Results:

Achieved sum-frequency generation (SFG) with a measured output power of 35 nW for 0.69 mW pump and 0.35 mW signal power.
Obtained a high normalized conversion efficiency of 298 %W(-1)cm(-2) in a 2.2 mm long device.
Demonstrated a broad process bandwidth exceeding 60 nm.

Conclusions:

Efficient sum-frequency generation (SFG) is feasible in epitaxial GaAs/AlGaAs waveguides.
Bragg reflection waveguides provide an effective method for phase matching in this system.
The demonstrated performance indicates potential for applications in optical frequency conversion and integrated photonics.