Ammonium bromide as a saturable absorbing device for ultrafast photonics

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-09-14 DOI:10.1016/j.jlumin.2025.121545

Norita Mohd Yusoff , Josephine Liew Ying Chyi , Eng Khoon Ng , Han Kee Lee , Mohd Zul Hilmi Mayzan , Mohammed Thamer Alresheedi , Nadiah Husseini Zainol Abidin , Ahmad Rifqi Md Zain , Mohd Adzir Mahdi

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引用次数: 0

Abstract

We demonstrate an ammonium bromide/polydimethylsiloxane (NH₄Br/PDMS) composite as a saturable absorbing device, exhibiting a modulation depth of 9.3% and a saturation fluence of 102 μJ/cm² at 1.56 μm wavelength. The laser cavity design was experimentally optimized by strategically arranging passive optical components, specifically by placing the optical coupler immediately between the amplifying section and the NH₄Br/PDMS-based saturable absorber. This laser setup achieved a low threshold power of 20.77 mW and delivered near transform-limited pulses with a narrowest width of 713 fs, producing an average output power of 10.72 mW and a pulse energy of 0.99 nJ. The robustness of the NH₄Br-based saturable absorber device was validated through a total monitoring period of 40 h, a damage threshold of greater than 16.40 mJ/cm², and continued functionality even after three years of fabrication. This work provides a pathway for the transition from laboratory research to commercial applications, and offers a valuable guideline for designing ultrafast pulse fiber laser systems. Since this work focused on optimizing an erbium-doped fiber (HP980 from Lucent Technologies) with a group velocity dispersion of +23 ps²/km, slight modifications might be necessary for other erbium-doped fibers to achieve optimum pulse performance.

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溴化铵作为超快光子学的可饱和吸收器件

我们研究了溴化铵/聚二甲基硅氧烷（NH4Br/PDMS）复合材料作为饱和吸收器件，在1.56 μm波长处，其调制深度为9.3%，饱和影响为102 μJ/cm2。通过对无源光学元件的合理布置，特别是将光耦合器直接放置在放大部分和基于NH4Br/ pdms的饱和吸收器之间，对激光腔的设计进行了实验优化。该激光器实现了20.77 mW的低阈值功率，并提供了近变换限制脉冲，最窄宽度为713 fs，平均输出功率为10.72 mW，脉冲能量为0.99 nJ。通过40小时的总监测周期、大于16.40 mJ/cm2的损伤阈值以及在制造三年后仍能保持功能，验证了基于nh4br的饱和吸收装置的稳健性。这项工作为超快脉冲光纤激光系统的设计提供了从实验室研究到商业应用的途径，并提供了有价值的指导。由于这项工作的重点是优化一种群速度色散为+23 ps2/km的掺铒光纤（朗讯科技公司HP980），因此可能需要对其他掺铒光纤进行轻微修改以实现最佳脉冲性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.