Switchable dual-, triple- and four-wavelength Nd:SRA laser on the 4F3/2 → 4I13/2 transition

IF 3.3 Q3 Physics and Astronomy

Results in Optics Pub Date : 2026-03-01 Epub Date: 2026-07-11 DOI:10.1016/j.rio.2026.101084

Chu Chu, Zhenhua Du, Nguyentuan Anh, Yuzhao Li

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Abstract

We report, for the first time, a continuous-wave (CW) multi-wavelength Nd:SrAl₁₂O₁₉ (Nd:SRA) laser operating on the ⁴F_3/2 → ⁴I_13/2 transition. The conditions of gain-to-loss balance required for simultaneous multi-wavelength operation were determined via a birefringent filter (BRF). This enabled simultaneous lasing at six dual-wavelength pairs (1333/1339, 1339/1346, 1339/1384, 1346/1365, 1365/1376 and 1376/1384 nm), two triple-wavelength groups (1339/1376/1384 and 1365/1376/1384 nm) and a four-wavelength combination (1339/1365/1376/1384 nm). Wavelength switching between these combinations was realized by rotating the BRF or replacing it with BRFs of different thicknesses. Under an incident pump power of 20 W at 792 nm, the dual-wavelength operation at 1339/1384 nm yielded the highest total output power of 2.85 W. The corresponding output powers for the triple-wavelength (1339/1376/1384 nm) and four-wavelength operations were 1.08 W and 617 mW, respectively.

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可切换双、三、四波长Nd:SRA激光器在4F3/2→4I13/2跃迁

本文首次报道了工作在4F3/2→4I13/2跃迁的连续波（CW）多波长Nd:SrAl12O19 （Nd:SRA）激光器。通过双折射滤光片（BRF）确定了同时多波长操作所需的损益平衡条件。这使得六个双波长对（1333/1339、1339/1346、1339/1384、1346/1365、1365/1376和1376/1384 nm）、两个三波长组（1339/1376/1384 nm）和一个四波长组合（1339/1365/1376/1384 nm）同时激光器成为可能。这些组合之间的波长切换是通过旋转BRF或用不同厚度的BRF替换它来实现的。在792 nm入射泵浦功率为20 W时，1339/1384 nm双波长工作产生的最高总输出功率为2.85 W。三波长（1339/1376/1384 nm）和四波长操作对应的输出功率分别为1.08 W和617 mW。

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