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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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Continuously tunable mode-spacing of a dual-mode external cavity InAs/InP quantum dot laser.

Hui-Hong Yuan, Feng Gao, Tao Yang

|October 20, 2017

Summary

Researchers demonstrated a tunable double-mode laser using quantum dots. This novel device allows for continuous adjustment of the spacing between two laser modes, offering new possibilities for optical applications.

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Area of Science:

Semiconductor Lasers
Quantum Dot Photonics
Optical Engineering

Background:

External cavity lasers offer wavelength tunability.
Quantum dot (InAs/InP) lasers provide unique optical properties.
Controlling multi-mode behavior is crucial for advanced laser applications.

Purpose of the Study:

To demonstrate a tunable double-mode external cavity laser using InAs/InP quantum dots.
To investigate the mode spacing tunability and control in a dual-Littrow configuration.
To achieve continuous adjustment of the separation between two laser modes.

Main Methods:

Utilized a dual-Littrow external cavity configuration with InAs/InP quantum dots.
Employed a modified tuning method involving grating rotation and an attenuation slice.
Analyzed the tuning spectrum to observe single and double mode coexistence and spacing.

Main Results:

Achieved a 115 nm single-mode tuning spectrum with varied mode intensity.
Demonstrated coexistence of single and double modes with a maximum mode spacing of 75 nm.
Obtained a continuously tunable mode-spacing range of up to 80 nm, with a best separation of 50 nm.

Conclusions:

A tunable double-mode InAs/InP quantum dot laser was successfully demonstrated.
The dual-Littrow configuration allows for continuous tuning of mode spacing.
This laser offers potential for applications requiring adjustable dual-wavelength emission.