High power Ho:Y<sub>2</sub>O<sub>3</sub> ceramic laser with controllable output intensity profile at 2.1 µm

ren, chuanyong; Ma, Ke; Wang, Fei; Shen, Deyuan; Wang, Jun; Zhu, Heyuan; Tang, Dingyuan

doi:10.1364/oe.489258

Opt. Express

2023

DOI: 10.1364/oe.489258

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High power Ho:Y₂O₃ ceramic laser with controllable output intensity profile at 2.1 µm

chuanyong ren¹,

Ke Ma²,

Fei Wang³

et al.

Abstract: We report on a high-power Ho:Y2O3 ceramic laser at 2.1 µm with controllable output beam profile ranging from LG01 donut, flat-top to TEM00 mode using a simple two-mirror resonator. In-band pumped at 1943nm using a Tm fiber laser beam shaped via a coupling optics comprising a capillary fiber and lens-combination to achieve distributed pump absorption in Ho:Y2O3 and hence selective excitation of the target mode, the laser yields 29.7 W of LG01 donut, 28.0 W of crater-like, 27.7 W of flat-top and 33.5 W of TEM00 … Show more

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Cited by 4 publications

References 28 publications

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Controlled Generation of High‐Purity Scalar Orbital Angular Momentum States from a High‐Power Single‐Crystal Fiber Laser

Zhao,

Chen,

Zheng

et al. 2024

Laser & Photonics Reviews

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The orbital angular momentum (OAM) of light, which is associated with the rotation of the phase structure, gives rise to numerous novel physical phenomena inlight–matter interactions. However, the direct generation of scalar OAM lasers with power‐handling capability and controllable states at the source remains challenging owing to mode degeneracy, handedness selection, and nonlinear thermal effects, which can even lead to topological charge splitting. This paper proposes a novel approach that allows spatial mode‐conversion‐controlled laser oscillation in a high‐gain OAM laser cavity with an integrated spiral‐face output coupler (SFOC). By adapting position‐dependent resonant modes, scalar optical vortices with a record power level (>60 W), high purity (>90%), and controllable OAM states (ħ or −8ħ) are demonstrated. Further, the dynamic process of OAM generation and evolution in the cavity is revealed. The concept presented herein opens a new route for the generation of OAM laser sources toward high power levels and holds promise for advancing classical and quantum optics, particularly in the area of light–matter interactions.

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Controlled Generation of High‐Purity Scalar Orbital Angular Momentum States from a High‐Power Single‐Crystal Fiber Laser

Zhao,

Chen,

Zheng

et al. 2024

Laser & Photonics Reviews

View full text Add to dashboard Cite

show abstract

Wavelength-tunable Tm:Y₂O₃ ceramic vortex laser with a changeable orbital angular momentum state

Du,

Zheng,

Sun

et al. 2024

Appl. Opt.

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Wavelength-tunable orbital angular momentum (OAM) lasers with controllable topological charges have the potential for serving as light sources for large-capacity optical communication by combining conventional wavelength division multiplexing (WDM) with OAM mode-division multiplexing (OAM-MDM). In this study, we demonstrate a wavelength-tunable Tm-bulk laser that can control OAM states in the 2-µm spectral range. The excitation conditions for different Laguerre-Gaussian (LG0,l) modes in a bulk laser cavity are theoretically determined by measuring the spatial propagation dynamics of the annular pump beam. As a proof-of-principle study, we experimentally generate OAM states of |ℏ| and |2ℏ| from a Tm:Y2O3 ceramic laser with a tunable emission wavelength using a Lyot filter (LF). The spatial properties of the scalar optical vortices are well conserved during wavelength tuning, indicating the feasibility of our approach for producing wavelength-tunable structured light. These OAM laser sources, which are characterized by their robustness and compactness, have potential applications in various areas such as optical communications, quantum optics, super-resolution microscopes, and more.

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Numerical modeling of an ASE suppression and power scalable approach in 1908 nm LMA-TDFO

Ren,

Qi,

et al. 2024

Opt. Express

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High-power Tm-doped fiber lasers operating at short wavelengths (< 1940 nm) are widely used in biomedical engineering, remote sensing, and pumping Ho-doped solid-state lasers. However, it is challenging to increase their output power. Amplified spontaneous emission (ASE) is a major bottleneck in scaling the power of Tm-doped fiber lasers operating at short wavelengths. This paper presents what we believe to be a novel approach for suppressing ASE and increasing output power in large-mode-area Tm-doped fiber oscillators (LMA-TDFOs) operating at short wavelengths. By designing a core with some particular doping profiles in LMA fibers, most ASE can be concentrated in the LP11 mode and suppressed by bending the fiber to a suitable radius. At the same time, the signal laser can be wholly coupled to the LP01 mode in the oscillator. A model describing the transverse mode competition and ASE is developed. A novel nested-ring doping scheme for LMA fibers is designed, and the output characteristics of a 1908 nm oscillator based on this scheme are numerically investigated. Theoretical analysis confirmed that this sophisticated doping design can effectively achieve the intended ASE suppression effect. Further simulations show that this method is expected to increase the output power of the 1908 nm LMA-TDFO to the kW level and has also demonstrated good practicability across a broader signal spectrum range (1848–1940 nm).

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High power Ho:Y₂O₃ ceramic laser with controllable output intensity profile at 2.1 µm

Cited by 4 publications

References 28 publications

Controlled Generation of High‐Purity Scalar Orbital Angular Momentum States from a High‐Power Single‐Crystal Fiber Laser

Controlled Generation of High‐Purity Scalar Orbital Angular Momentum States from a High‐Power Single‐Crystal Fiber Laser

Wavelength-tunable Tm:Y₂O₃ ceramic vortex laser with a changeable orbital angular momentum state

Numerical modeling of an ASE suppression and power scalable approach in 1908 nm LMA-TDFO

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High power Ho:Y2O3 ceramic laser with controllable output intensity profile at 2.1 µm

Cited by 4 publications

References 28 publications

Controlled Generation of High‐Purity Scalar Orbital Angular Momentum States from a High‐Power Single‐Crystal Fiber Laser

Controlled Generation of High‐Purity Scalar Orbital Angular Momentum States from a High‐Power Single‐Crystal Fiber Laser

Wavelength-tunable Tm:Y2O3 ceramic vortex laser with a changeable orbital angular momentum state

Numerical modeling of an ASE suppression and power scalable approach in 1908 nm LMA-TDFO

Contact Info

Product

Resources

About

High power Ho:Y₂O₃ ceramic laser with controllable output intensity profile at 2.1 µm

Wavelength-tunable Tm:Y₂O₃ ceramic vortex laser with a changeable orbital angular momentum state