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High-power dense wavelength division multiplexing of multimode diode laser radiation based on volume Bragg gratings

机译:基于体积布拉格光栅的多模二极管激光辐射高功率密集波分复用

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摘要

We present a dense wavelength division multiplexer based on volume Bragg gratings (VBGs) with a channel spacing of Δλ = 1.5 nm. Multiplexing efficiencies of η_(SM) = 97 have been demonstrated with single-mode, frequency-stabilized diode laser radiation. By use of VBGs in an external-cavity laser we constrict the spectral bandwidth of passively cooled multimode diode laser bars with 19 broad-area emitters to δλ_(95) = 120 pm. When the multimode high-power diode laser radiation with a beam propagation factor of M~2 ≈ 45 is overlaid, the multiplexing efficiency decreases to η_(MM) = 85. Temperature control of the VBGs expands the high-efficiency operation range.
机译:我们提出了一种基于体积布拉格光栅(VBG)的密集波分多路复用器,其通道间距为Δλ = 1.5 nm。单模、频率稳定的二极管激光辐射证明了 η_(SM) = 97% 的多路复用效率。通过在外腔激光器中使用VBG,我们将具有19个广域发射器的被动冷却多模二极管激光棒的光谱带宽缩小到δλ_(95%) = 120 pm。当光束传播因子为M~2≈45的多模高功率二极管激光辐射叠加时,复用效率降至η_(MM) = 85%。VBG的温度控制扩大了高效操作范围。

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