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$Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing$

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Published on: April 25, 2019

Direct-focusing surface-emitting laser.

Kazuyoshi Hirose, Hiroki Kamei, Takahiro Sugiyama

|February 25, 2022

Summary

This summary is machine-generated.

Researchers demonstrate direct optical focusing from a band-edge surface-emitting laser without lenses. This novel approach uses a phase-modulating layer within the laser cavity for precise beam manipulation, enabling micro-sensing applications.

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Area of Science:

Optics and Photonics
Semiconductor Lasers
Holography

Background:

Optical focusing is typically achieved using lenses.
Band-edge surface-emitting lasers offer unique emission properties.
Holographic spatial-phase modulation can control light beams.

Purpose of the Study:

To demonstrate direct optical focusing from a laser without external lenses.
To integrate focusing capabilities into a band-edge surface-emitting laser.
To explore applications in micro-sensing.

Main Methods:

Incorporating a phase-modulating layer into the laser cavity.
Utilizing a photonic crystal laser design with modified hole positions.
Analyzing beam profiles to confirm focusing properties.

Main Results:

Achieved direct focusing with a focal length of 310 µm and focal spot size of 6.1 µm.
Demonstrated a power density enhancement of 540 times at the focus.
Observed simultaneous emission of converging and diverging beams.

Conclusions:

Direct focusing from a laser cavity is feasible using integrated phase modulation.
The developed laser is suitable for 3D point cloud generation via Fresnel holography.
Potential applications include microfluidics, flow cytometry, and endoscopy.