All-fiber Ho-doped mode-locked oscillator based on a graphene saturable absorber

Abstract

In this Letter, we demonstrate a graphene mode-locked, all-fiber Ho-doped fiber laser generating 1.3 nJ energy pulses directly from the oscillator. The graphene used as a saturable absorber was obtained via chemical vapor deposition on copper substrate and immersed in a poly(methyl methacrylate) support. The laser generated ultrashort soliton pulses at 2080 nm with bandwidth up to 6.1 nm. The influence of the output coupling ratio and the SA modulation depth on the mode-locking performance was also investigated.

2D Layered Materials: Synthesis, Nonlinear Optical Properties, and Device Applications

“…Additionally, researchers from other groups also demonstrated the 2 µm mode‐locked lasers based on WS 2 SA and BP SA, respectively, as shown in Figure d–i. Up to now, 2 µm mode‐locked fiber lasers have been achieved with layered materials, such as graphene, Bi 2 Te 3 , MoS 2 , WS 2 , WTe 2 , WSe 2 , MoTe 2 , and BP, respectively. Among them, several important works should be emphasized, such as the maximum pulse energy of 35.2 nJ, the repetition rate of 58.87 MHz, and the minimum pulse width of 190 fs …”

Generation of sub-100 fs pulses tunable from 1700 to 2100 nm from a compact frequency-shifted Er-fiber laser

“…Efficient and compact 2 μm sources are widely used, e.g., for mid-infrared supercontinuum (SC) generation in photonic crystal fibers [2] and pumping of optical parametric oscillators [3,4] as well as in medical procedures [5,6]. Most commonly, 2 μm femtosecond pulses are generated from mode-locked fiber lasers based on Tm-or Ho-doped gain fibers, utilizing various mode-locking techniques, e.g., nonlinear polarization evolution (NPE) [7][8][9], graphene [10,11], or carbon nanotube saturable absorbers [12]. The simplest fiber lasers, namely, soliton lasers with all-anomalous dispersion cavities, are capable of generating sub-600 fs pulses at 2 μm to date [10,11].…”

“…Most commonly, 2 μm femtosecond pulses are generated from mode-locked fiber lasers based on Tm-or Ho-doped gain fibers, utilizing various mode-locking techniques, e.g., nonlinear polarization evolution (NPE) [7][8][9], graphene [10,11], or carbon nanotube saturable absorbers [12]. The simplest fiber lasers, namely, soliton lasers with all-anomalous dispersion cavities, are capable of generating sub-600 fs pulses at 2 μm to date [10,11]. Generation of shorter pulses requires careful dispersion management of the cavity and external compression of the pulses.…”

Сравнение Режимов Синхронизации Мод В Гольмиевом Волоконном Лазере

“…Для достижения больших длин волн в двухмикронном диапазоне в качестве активной среды используют волокна, легированные ионами гольмия [2]. Режим синхронизации мод в импульсных гольмиевых волоконных лазерах в основном реализован за счет медленных насыщающихся поглотителей, таких как: углеродные нанотрубки [3], графен [4], самопросветляющиеся зеркала (SESAM) [5]. Однако, исходя из работ, посвященных эрбиевым и тулиевым волоконным лазерам, для достижения самозапуска лазера и стабильной генерации коротких импульсов следует использовать гибридную синхронизацию мод, основанную на совместном использовании медленного насыщающегося поглотителя и быстрого поглотителя, основанного на нелинейном эффекте Керра [6].…”