Multiphonon-assisted lasing beyond the fluorescence spectrum

Liang, Fei; He, Cheng; Lu, Dazhi; Fang, Qiannan; Fu, Yu; Yu, Haohai; Zhang, Huaijin; Chen, Yan‐Feng

doi:10.1038/s41567-022-01748-z

Cited by 38 publications

(27 citation statements)

References 39 publications

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“…The dominated phonon modes in this coupling process were verified to the cooperative vibrations of “free‐oxygen” motif. [ 6,18 ] It is clear that the gain cross section of Yb:YCOB at around 1131 nm is only 0.34 × 10 −21 cm 2 , which is 1/7 times of 1082 nm (2.03 × 10 −21 cm 2 ), and 1/20 times of that at 1026 nm (7.2 × 10 −21 cm 2 ). Therefore, to make it lasing around 1130 nm, the conventional lasers at 1020, 1026, and 1082 nm must be suppressed.…”

Section: Resultsmentioning

confidence: 99%

“…As depicted in Figure 2b, for T oc = 0.1%, the lasing threshold is 1.62 W. The maximum output power reaches to 266 mW with a slope efficiency of 5.5%, which is consistent with our previous report. [ 6 ] When T oc becomes 1% and 3%, the lasing threshold increases to 2.63 and 3.89 W. And the maximum output power improves to 1.68 and 3.95 W, corresponding to a high slope efficiency of 34.1% and 52.4%, respectively. This slope efficiency at fluorescence sidebands even surpasses some non‐vibronic Nd 3+ ‐doped laser at 1123 nm, [ 20,21 ] indicating the great potential of vibronic lasers despite its low‐gain emission.…”

Section: Resultsmentioning

confidence: 99%

“…[4,5] Recently, we have demonstrated the direct lasing far beyond the fluorescence spectrum in ytterbium-doped YCa 4 O(BO 3 ) 3 (Yb:YCOB) crystal. [6] This strategy provides a novel route to search light in the darkness and paves new routes for the laser generation at those spectral gap without suitable active ions.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Direct Laser Generation by Three‐Phonon‐Assisted Transition with Yb:YCOB Crystal

Liang

et al. 2023

Advanced Photonics Research

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Electron–phonon‐coupling effect can generate the direct lasing beyond the fluorescence spectrum of the gain medium, but the laser efficiency is still low owing to weak multiphonon‐coupling intensity. Herein, associated with the three‐phonon‐assisted electron transitions beyond 1100 nm, the tunable laser generation from 1125 to 1155 nm and highly efficient continuous‐wave lasers at 1131 and 1140 nm in a ytterbium‐doped YCa4O(BO3)3 crystal are realized, by balancing the intracavity loss and phonon‐determined gain. The maximum output power reaches to 3.95 and 2.06 W at 1131 and 1140 nm, corresponding to a slope efficiency of 52.4% and 39.1%, respectively, which represents the highest efficiency in the solid‐state lasers in this spectral range. More impressively, this phonon‐assisted vibronic laser exhibits a wide‐spectral tunability and a good output power stability. Herein, a practical laser source in the underdeveloped spectral range is provided by the results, and they are helpful for the development of multiphonon‐assisted lasers beyond the inherent fluorescence spectrum.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Efficient Direct Laser Generation by Three‐Phonon‐Assisted Transition with Yb:YCOB Crystal

Liang

et al. 2023

Advanced Photonics Research

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“…19,20 These favorable traits can greatly improve pumping efficiency and generate ultrashort pulse lasers. 21 Although lots of broadband NIR emissions in disordered crystals have been reported, few of them involve the 900 nm band. 22,23 Herein, a silica glass clad fiber containing a Nd 3+ /Yb 3+ :YCa 4 O(BO 3 ) 3 (abbreviated Nd 3+ /Yb 3+ :YCOB) disordered crystal core was drawn by the molten core method.…”

Section: Introductionmentioning

confidence: 99%

“…Disordered laser crystals, in which two or more cations statistically occupy the same lattice site, have attracted much attention due to favorable thermomechanical features, as well as their relatively broad emission lines 19,20 . These favorable traits can greatly improve pumping efficiency and generate ultrashort pulse lasers 21 . Although lots of broadband NIR emissions in disordered crystals have been reported, few of them involve the 900 nm band 22,23 …”

Section: Introductionmentioning

confidence: 99%

Enhanced broadband NIR emission in glass–ceramic fibers containing Nd³⁺/Yb³⁺ co‐doped YCa₄O(BO₃)₃ disordered nanocrystal

et al. 2023

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Demands are increasing for ultrashort pulse laser in industrial applications, where the gain bandwidth of most optical fiber material is not wide enough, and developing a wide bandwidth gain medium is challenging. Glass-ceramic fibers containing Nd 3+ /Yb 3+ co-doped YCa 4 O(BO 3 ) 3 nanocrystals were fabricated by the molten core method and successive heat treatment. After a careful heat treatment, Nd 3+ /Yb 3+ co-doped YCa 4 O(BO 3 ) 3 nanocrystals were precipitated in the fiber core. Enhanced broadband near-infrared (NIR) emission from 850 to 1150 nm (bandwidth: ∼252 nm) was obtained in the glass-ceramic fiber compared to that of precursor fiber. These results suggest that the Nd 3+ /Yb 3+ glass-ceramic fibers are promising for broadband NIR optical amplifications and lasers. K E Y W O R D Sbroadband near-infrared luminescence, GC fiber, heat treatment, YCa 4 O(BO 3

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Pursuing Reliability and Sensitivity of Pr³⁺ Fluorescence Temperature Sensing: Through the Lens of Excitation Strategy

Han,

Zhang,

Gao

et al. 2024

Advanced Optical Materials

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Despite the remarkable luminescent properties and temperature sensing capabilities of lanthanide materials, their photothermal effect in practical temperature measurement systems presents a major challenge to sensing reliability. Herein, taking Pr3+ as a typical exemplar, the influence of excitation wavelength and excitation approach on temperature sensing is systematically examined. The pulsed laser excitation method is identified as an efficient tactic to restrain the self‐heating of luminescence materials. In accordance with this principle, it is discovered that diverse excitation wavelengths give rise to alterations in the internal energy transport channels and further impact the temperature sensing performance. The 980 nm pulsed laser can result in the non‐thermal coupling occupying states of 3P0/3P1, which are recognized as thermal coupling energy levels in the conventional concept, and yield a relative sensitivity (Sr) performance more than three times superior to that of down‐shifting‐based sensing. The work provides a comprehensive analytical solution for achieving highly sensitive and stable temperature sensing based on excitation wavelength and working mode strategies.

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Multiphonon-assisted lasing beyond the fluorescence spectrum

Cited by 38 publications

References 39 publications

Efficient Direct Laser Generation by Three‐Phonon‐Assisted Transition with Yb:YCOB Crystal

Efficient Direct Laser Generation by Three‐Phonon‐Assisted Transition with Yb:YCOB Crystal

Enhanced broadband NIR emission in glass–ceramic fibers containing Nd³⁺/Yb³⁺ co‐doped YCa₄O(BO₃)₃ disordered nanocrystal

Pursuing Reliability and Sensitivity of Pr³⁺ Fluorescence Temperature Sensing: Through the Lens of Excitation Strategy

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Multiphonon-assisted lasing beyond the fluorescence spectrum

Cited by 38 publications

References 39 publications

Efficient Direct Laser Generation by Three‐Phonon‐Assisted Transition with Yb:YCOB Crystal

Efficient Direct Laser Generation by Three‐Phonon‐Assisted Transition with Yb:YCOB Crystal

Enhanced broadband NIR emission in glass–ceramic fibers containing Nd3+/Yb3+ co‐doped YCa4O(BO3)3 disordered nanocrystal

Pursuing Reliability and Sensitivity of Pr3+ Fluorescence Temperature Sensing: Through the Lens of Excitation Strategy

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Enhanced broadband NIR emission in glass–ceramic fibers containing Nd³⁺/Yb³⁺ co‐doped YCa₄O(BO₃)₃ disordered nanocrystal

Pursuing Reliability and Sensitivity of Pr³⁺ Fluorescence Temperature Sensing: Through the Lens of Excitation Strategy