使用双掩膜干涉仪用低能量聚焦 fs 脉冲高效写入光纤布拉格光栅

IF 2.1 4区 物理与天体物理 Q2 OPTICS Photonics Pub Date : 2024-07-04 DOI:10.3390/photonics11070639
François Ouellette
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引用次数: 0

摘要

我们利用重复频率为 60 kHz、能量仅为 7 μJ 的 343 nm 飞秒脉冲和双掩膜干涉仪,演示了在无氢气负载的情况下快速写入强光纤布拉格光栅 (FBG)。光束沿光纤轴线聚焦到 30-50 μm 的直径,大大提高了峰值功率,同时避免了对掩膜的损坏。在不到一分钟的曝光时间内,可获得超过 10-3 的折射率调制。为了避免在 SMF-28 光纤中观察到的强烈温度梯度,使用了振镜扫描仪来快速前后横向移动光束,最长可达 1 毫米。在 SMF-28 和 20/400 μm 光纤中写入了 FBG。在后一种光纤中,由于散热性能更好,我们可以使用标准的相位掩膜扫描技术写入 FBG,并写入 0.28 毫米的高斯光栅 FBG。
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Efficient Writing of Fiber Bragg Gratings with Low Energy Focused fs Pulses Using a Two-Mask Interferometer
We demonstrate fast writing of strong fiber Bragg grating (FBG) without hydrogen loading using 343 nm femtosecond pulses of only 7 μJ energy at 60 kHz repetition rates and a two-mask interferometer. The beam was focused to a 30–50 μm diameter along the fiber axis, greatly enhancing the peak power while avoiding damage to the masks. A refractive index modulation of more than 10−3 could be obtained in less than one minute exposure. To avoid the observed strong temperature gradient observed in the SMF-28 fiber, a galvo scanner was used to rapidly move the beam back and forth laterally up to 1 mm. FBG were written in SMF-28, as well as 20/400 μm fiber. In the latter fiber, better heat dissipation allowed us to write the FBG with the standard phase mask scanning technique, and a 0.28 mm Gaussian apodized FBG could be written.
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来源期刊
Photonics
Photonics Physics and Astronomy-Instrumentation
CiteScore
2.60
自引率
20.80%
发文量
817
审稿时长
8 weeks
期刊介绍: Photonics (ISSN 2304-6732) aims at a fast turn around time for peer-reviewing manuscripts and producing accepted articles. The online-only and open access nature of the journal will allow for a speedy and wide circulation of your research as well as review articles. We aim at establishing Photonics as a leading venue for publishing high impact fundamental research but also applications of optics and photonics. The journal particularly welcomes both theoretical (simulation) and experimental research. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material.
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