Tm:YAG single-crystal fiber laser

Liu, Jian; Dong, Jifei; Wang, Yinyin; Guo, Jun; Xue, Yongqiang; Zhao, Yongguang; Xu, Xiaodong; Yu, Haohai; Wang, Zhengping; Xu, Xin­guang; Chen, Weidong; Petrov, Valentín

doi:10.1364/ol.434618

Cited by 19 publications

(9 citation statements)

References 19 publications

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“…For the OAM laser studies, the Yb:YAG SCF was mounted in a specially designed aluminum module, in direct contact with the cooling water, which simultaneously acted as a cladding. [ 64 ] A YAG plate was inserted into the cavity at Brewster's angle to enforce the horizontal linear polarization of the optical vortices. A lens with an optimized focal length of f = 175 mm was used to control the beam size on the SFOC by collimating the intracavity laser mode.…”

Section: Methodsmentioning

confidence: 99%

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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Section: Methodsmentioning

confidence: 99%

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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“…For the amplification studies, the SCF was mounted in a specially designed homemade module, directly in contact with cooling water which simultaneously acts as a cladding. [ 43 ] In view of the specific geometrical structure of the SCF compared to a conventional glass fiber, the spatial intensity distribution of the pump light could be simulated by using ray‐tracing analysis (Figure S1, Supporting Information). To ensure free‐space propagation of the laser beam and mode matching with the pump light in the SCF, the former was focused in the SCF to a spot diameter of ≈450 µm, the same as for the pump beam (Figure S2, Supporting Information).…”

Section: Methodsmentioning

confidence: 99%

“…In this work, we show that a single‐crystal fiber (SCF) amplifier is a good solution for the above described challenges, which is capable of providing straightforward power scaling while maintaining spatial and temporal properties of a broadband femtosecond optical vortex. The term SCF refers to an intermediate architecture between bulk crystals and optical fibers, [ 42–44 ] where the fiber‐like geometry combined with the crystalline nature exhibiting high thermal conductivity facilitate the management of the thermal load. [ 42 ] More importantly, the pump light is wave‐guided in the SCF to provide an azimuthally uniform gain distribution for the structured light within a long region, whereas the seed laser beam optics designed for free‐space propagation can retain the spatial light structure without mode coupling or perturbations.…”

Section: Introductionmentioning

confidence: 99%

Twisted Light in a Single‐Crystal Fiber: Toward Undistorted Femtosecond Vortex Amplification

Zhao

Zheng

Huang

et al. 2022

Laser & Photonics Reviews

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Intense femtosecond optical vortices with spatially structured amplitude and spiral phase front give rise to novel phenomena in light-matter interactions and strong-field physics. However, current femtosecond vortex sources exhibit a poor power handling capability and amplification remains an open challenge due to a number of inherent technical difficulties. Here, it is demonstrated that a single-crystal fiber laser amplifier is particularly well-suited to directly amplify a femtosecond optical vortex without pulse stretching and compression in the time domain, while still maintaining the spatial properties associated with a clear central singularity and a spiral phase front, i.e., a well-defined amount of orbital angular momentum (OAM).The optical nonlinearity experienced by such twisted light is verified to be substantially weaker compared to a fundamental mode beam where supercontinuum generation and spatial distortion are observed. The simple design and straightforward power scaling capability pave the way toward ultrahigh-intensity femtosecond singular laser sources with an arbitrary topological charge. Such ultrafast OAM light sources are expected to help reveal complex physical phenomena in light-matter interactions and expand the applications to attoscience with X-ray vortices, laser plasma acceleration, and micromachining.

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“…A typical result of the beam quality is shown in figure 6(b) at an output power of 6.5 W. As can be seen in figures 6(c) and (d), beam profiles at the output power of 1.4 W and 6.5 W indicated the excitation of higher-order transverse modes with the laser power increasing. To further improve the beam quality, future work will focus on designing the pump-guiding region with a suitable pump waist in the laser operation [35] and optimizing the cavity design for proper fundamental mode size.…”

Section: Laser Performance Analysismentioning

confidence: 99%

High-efficiency Ho:YAG single-crystal fiber laser in-band pumped by a 1.9 μm laser diode

Wang¹,

Dong²,

Liu³

et al. 2023

Laser Phys. Lett.

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We report on a 10-watt-level, efficient 2 μm Ho:YAG (0.6 at.% Ho3+ doped Y3Al5O12) single crystal fiber (SCF) laser in-band pumped by a 1.9 μm laser diode. Benefiting from the high gain of the SCF and the unique propagation features of the pump and laser beams, a maximum output power of 10.77 W is achieved with T OC = 20%, corresponding to a slope efficiency of 61.8%. The higher efficiency of 64.8% and the output power of 9.8 W are obtained with T OC = 50%. Compared to the traditional bulk crystal, wave-guiding of the pump light in the SCF can extend the gain region and thus improve the laser efficiency, which provides a simple and effective method to improve the utilization rate of the pump light even for the low-brightness laser diodes.

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Tm:YAG single-crystal fiber laser

Cited by 19 publications

References 19 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

Twisted Light in a Single‐Crystal Fiber: Toward Undistorted Femtosecond Vortex Amplification

High-efficiency Ho:YAG single-crystal fiber laser in-band pumped by a 1.9 μm laser diode

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