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Dual-wavelength Q-switched pulse generation using D-fibre and MoS2 saturable absorber 

1Jaddoa M. F., 1Odah J. F., 2Ahmad H., 3,4Amiri I. S. and 2Tiu Z. C.

1Department of Physics, Almuthanna University, Iraq
2Photonics Research Center, University of Malaya, 50603 Kuala Lumpur, Malaysia
3Computational Optics Research Group, Ton Duc Thang University, Ho Chi Minh City, Vietnam
4Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam

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Abstract. We have demonstrated a dual-wavelength Q-switched generation of erbium-doped fibre laser, which is achieved using a D-fibre and several layers of molybdenum disulfide as a saturable absorber. Bulk MoS2 has been processed using a liquid-phase exfoliation to obtain a layered structure. To provide a thin-film structure, MoS2 has been mixed with a polyvinyl-alcohol polymer. The dual-wavelength spectrum of our device reveals two peaks centred at 1555 and 1562 nm. Q-switched operation at the both spectral peaks has been investigated using a tunable bandpass filter

Keywords: dual wavelength operation, Q-switched, D-fibre

PACS: 42.60.Gd
UDC: 621.373.826
Ukr. J. Phys. Opt. 19 27-32
doi: 10.3116/16091833/19/1/27/2018
Received: 31.08.2017

Анотація. Продемонстровано, що генерацію на двох довжинах хвиль для лазера з модульованою добротністю на активованому ербієм волокні можна досягти шляхом використання D-волокна і декількох шарів дисульфіду молібдену як поглинача з насиченням. Для одержання шаруватої структури об’ємний MoS2 обробляли за методом рідинного фазового відшарування, а для забезпечення тонкоплівкової структури MoS2 змішували з полівініл-спиртовим полімером. Спектр лазера виявляє два піки з центрами при 1555 і 1562 нм. Модуляцію добротності на обох спектральних піках було вивчено з використанням перестроюваного смугового фільтра пропускання.
 

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