Comparison of optical properties and self Q-switched lasing in Cr-Nd co-doped GdVO4 and YVO4 single crystals

IF 2.8 3区物理与天体物理 Q2 PHYSICS, CONDENSED MATTER

Physica B-condensed Matter Pub Date : 2025-03-22 DOI:10.1016/j.physb.2025.417171

M. Soharab , R. Bhatt , N.S. Benerji , Indranil Bhaumik

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引用次数: 0

Abstract

Crystals of 0.5 at% Nd-1.0 at% Cr co-doped YVO₄ and GdVO₄ were grown by optical floating zone technique. Absorption is polarization sensitive for both the crystals with higher value for polarization ∥ to c-axis. Also, the overall absorption for Cr,Nd:YVO₄ is higher. For Cr ion a broad polarization sensitive absorption around 900–1300 nm appears. Bandgap is also polarization sensitive and is slightly higher for co-doped YVO₄. Photoluminescence intensity corresponding to transition at 1064 nm for Cr,Nd:YVO₄ is lower due to the higher absorption of Cr ion in Nd:YVO₄. Further, Judd-Ofelt analysis revealed that the spectroscopic quality factor for both the crystals is nearly same. However, the estimated absorption and stimulated emission cross-section is higher for co-doped YVO₄. Estimated radiative lifetime is ∼112 μs for Cr,Nd:GdVO₄ and ∼95 μs for Cr,Nd:YVO₄. Further, self Q-switched pulsed lasing was demonstrated in [100] elements. The co-doped GdVO₄ crystal exhibits lower threshold power and higher slope efficiency.

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通过光学浮区技术生长了 0.5 at% Nd-1.0 at% Cr 共掺杂的 YVO4 和 GdVO4 晶体。这两种晶体的吸收对偏振敏感，偏振∥c 轴时吸收值较高。此外，Cr,Nd:YVO4 的整体吸收率更高。对于铬离子，900-1300 nm 波长范围内出现了广泛的偏振敏感吸收。带隙也对偏振敏感，共掺杂 YVO4 的带隙略高。由于 Cr 离子在 Nd:YVO4 中的吸收率较高，因此 Cr、Nd:YVO4 在 1064 纳米波长处转变所对应的光致发光强度较低。此外，Judd-Ofelt 分析表明，两种晶体的光谱品质因数几乎相同。然而，共掺杂 YVO4 的估计吸收和受激发射截面更高。Cr,Nd:GdVO4 的估计辐射寿命为 ∼112 μs，Cr,Nd:YVO4 为 ∼95 μs。此外，[100] 元素还演示了自 Q 开关脉冲激光。共掺杂的 GdVO4 晶体具有更低的阈值功率和更高的斜率效率。

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来源期刊

Physica B-condensed Matter 物理-物理：凝聚态物理

CiteScore

4.90

自引率

7.10%

发文量

703

审稿时长

44 days

期刊介绍： Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work. Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas: -Magnetism -Materials physics -Nanostructures and nanomaterials -Optics and optical materials -Quantum materials -Semiconductors -Strongly correlated systems -Superconductivity -Surfaces and interfaces