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Single-frequency orbital angular momentum switchable modes from a microchip laser.

Chen Li, Ziyu Hua, Qing Wang

|June 2, 2024

Summary

We developed a compact laser that generates switchable, single-frequency orbital angular momentum (OAM) modes at a 1 µm wavelength. This versatile OAM source achieves high fidelity for various modes, advancing optical technologies.

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Area of Science:

Optics and Photonics
Laser Physics

Background:

Orbital angular momentum (OAM) modes offer unique properties for optical applications.
Generating switchable, single-frequency OAM modes efficiently remains a challenge.

Purpose of the Study:

To demonstrate a novel method for direct generation of single-frequency switchable OAM modes.
To develop a compact and versatile OAM laser source.

Main Methods:

Utilized a Nd:YVO₄ microchip laser operating at a 1 µm wavelength.
Shaped an 808 nm laser diode pump beam into an annular profile using an axicon and lens.
Adjusted pump beam parameters to control OAM mode oscillation and volume.

Main Results:

Successfully generated single-frequency switchable OAM modes (|±1> and |±2>) with fidelity exceeding 96%.
Demonstrated the capability to tune OAM modes by adjusting the annular pump beam's diameter and power.
Achieved single-frequency output due to the microchip laser's short cavity.

Conclusions:

Presented a compact and versatile single-frequency OAM laser source.
The developed technology has potential applications in classical and quantum photonics.
This work paves the way for advanced optical communication and sensing systems.