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Confocal Fluorescence Microscopy

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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

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Confocal unstable-resonator semiconductor laser.

J Salzman, R Lang, A Larson

|September 10, 2009

Summary

This summary is machine-generated.

Researchers developed novel Gallium Arsenide/Gallium Aluminum Arsenide (GaAs/GaAlAs) lasers. These lasers feature a monolithic confocal unstable resonator, producing a nearly collimated beam with a narrow far-field pattern.

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Area of Science:

Semiconductor lasers
Optoelectronics
Materials science

Background:

Gallium Arsenide/Gallium Aluminum Arsenide (GaAs/GaAlAs) heterostructures are key materials for optoelectronic devices.
Confocal unstable resonators offer potential for improved beam quality in lasers.
Fabrication challenges exist for integrating complex resonator structures into semiconductor lasers.

Purpose of the Study:

To demonstrate Gallium Arsenide/Gallium Aluminum Arsenide (GaAs/GaAlAs) heterostructure lasers incorporating a monolithic confocal unstable resonator.
To investigate the operational characteristics and beam quality of these novel laser structures.

Main Methods:

Fabrication of curved mirrors satisfying the confocal condition using etching techniques.
Integration of these mirrors into a monolithic GaAs/GaAlAs heterostructure laser device.
Characterization of laser output near the lasing threshold.

Main Results:

Successful demonstration of GaAs/GaAlAs heterostructure lasers with a monolithic confocal unstable resonator.
Observation of single lateral mode operation close to the lasing threshold.
Measurement of a nearly collimated output beam with a narrow, single-lobe far-field intensity distribution (1.9 degrees FWHM).

Conclusions:

Monolithic confocal unstable resonators can be effectively fabricated in GaAs/GaAlAs heterostructure lasers.
These lasers exhibit desirable properties such as single lateral mode operation and high beam quality.
The demonstrated device represents a significant advancement in high-performance semiconductor laser technology.