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

Chen Li; Ziyu Hua; Qing Wang; Lang Li; Zhichao Zhang; Lan Hai; Yidong Tan; Chunqing Gao; Shiyao Fu

doi:10.1364/OL.526168

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

Chen Li, Ziyu Hua, Qing Wang, Lang Li, Zhichao Zhang, Lan Hai, Yidong Tan, Chunqing Gao, Shiyao Fu

School of Optics and Photonics

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

We demonstrate the direct generation of single-frequency switchable orbital angular momentum (OAM) modes in a 1 μm wavelength range using a Nd:YVO4 microchip laser. The 808nm laser diode pump beam is shaped into annular through an axicon associated with a lens. By adjusting the diameter and power of the annular pump beam, various OAM modes with different mode volumes can oscillate inside the Nd:YVO4 microchip. Moreover, a single-frequency output is also available due to the short cavity of the microchip. In the proof-of-principle experiment, single-frequency twofold multiplexed OAM modes | ±1> and | ±2> are generated, with experimentally measured fidelity higher than 96%. This work presents a compact and versatile single-frequency OAM source and will inspire multiple advanced scenarios ranging from classical to quantum photonics.

Original language	English
Pages (from-to)	3198-3201
Number of pages	4
Journal	Optics Letters
Volume	49
Issue number	11
DOIs	https://doi.org/10.1364/OL.526168
Publication status	Published - 1 Jun 2024

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title = "Single-frequency orbital angular momentum switchable modes from a microchip laser",

abstract = "We demonstrate the direct generation of single-frequency switchable orbital angular momentum (OAM) modes in a 1 μm wavelength range using a Nd:YVO4 microchip laser. The 808nm laser diode pump beam is shaped into annular through an axicon associated with a lens. By adjusting the diameter and power of the annular pump beam, various OAM modes with different mode volumes can oscillate inside the Nd:YVO4 microchip. Moreover, a single-frequency output is also available due to the short cavity of the microchip. In the proof-of-principle experiment, single-frequency twofold multiplexed OAM modes | ±1> and | ±2> are generated, with experimentally measured fidelity higher than 96%. This work presents a compact and versatile single-frequency OAM source and will inspire multiple advanced scenarios ranging from classical to quantum photonics.",

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AU - Li, Chen

AU - Hua, Ziyu

AU - Wang, Qing

AU - Li, Lang

AU - Zhang, Zhichao

AU - Hai, Lan

AU - Tan, Yidong

AU - Gao, Chunqing

AU - Fu, Shiyao

PY - 2024/6/1

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AB - We demonstrate the direct generation of single-frequency switchable orbital angular momentum (OAM) modes in a 1 μm wavelength range using a Nd:YVO4 microchip laser. The 808nm laser diode pump beam is shaped into annular through an axicon associated with a lens. By adjusting the diameter and power of the annular pump beam, various OAM modes with different mode volumes can oscillate inside the Nd:YVO4 microchip. Moreover, a single-frequency output is also available due to the short cavity of the microchip. In the proof-of-principle experiment, single-frequency twofold multiplexed OAM modes | ±1> and | ±2> are generated, with experimentally measured fidelity higher than 96%. This work presents a compact and versatile single-frequency OAM source and will inspire multiple advanced scenarios ranging from classical to quantum photonics.

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

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