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首页二维材料PtSe2驱动的Er掺杂光纤激光器的Q开关与模式锁定研究
二维材料PtSe2驱动的Er掺杂光纤激光器的Q开关与模式锁定研究
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更新于2024-08-29
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本文主要探讨了一种基于新型二维材料二硫化铂(PtSe2)的被动式Q开关和模式锁定掺铒光纤激光器(Erbium-doped fiber laser, EDFL)。这项研究展示了在光纤激光器中利用PtSe2作为饱和吸收器(Saturable Absorber, SA)的潜力,这对于光脉冲调制技术具有重要意义。 在实验中,当泵浦功率达到65毫瓦的阈值时,PtSe2作为SA使得EDFL实现了自我启动的Q开关操作,工作波长位于1560纳米。随着泵浦功率的增加,可达最大450毫瓦,单个Q开关脉冲能量可达到143.2纳焦耳,显示出较高的能量转换效率。PtSe2 SA的独特特性在于其对光的极化依赖性,这意味着通过调整激光的极化状态,可以灵活地在Q开关模式和模式锁定模式之间切换。在模式锁定状态下,生成的脉冲串具有更稳定的周期性和更高的重复频率,这对于许多应用,如光纤通信、光开关和精密测量等具有潜在优势。 这种基于PtSe2的SA的Q开关和模式锁定EDFL不仅展示了二维材料在激光技术中的新颖应用,而且可能推动材料科学与光子学领域的交叉研究。未来的研究方向可能包括优化材料性能以实现更高的转换效率和更短的脉冲宽度,以及探索更多二维材料在不同光波段和复杂脉冲调制模式下的应用。此外,这种系统的紧凑性和稳定性对于集成光子学系统的发展也具有重要价值。这项工作为设计和制造高性能、灵活控制的光纤激光器提供了一种创新的方法。
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Q-switched and mode-locked Er-doped fiber laser
using PtSe
2
as a saturable absorber
KANG ZHANG,
1
MING FENG,
1,
*YANGYANG REN,
1
FANG LIU,
1
XINGSHUO CHEN,
1
JIE YANG,
1
XIAO-QING YAN,
1,2
FENG SONG,
1
AND JIANGUO TIAN
1
1
Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics and TEDA Applied Physics School,
Nankai University, Tianjin 300071, China
2
e-mail: yanxq01@nankai.edu.cn
*Corresponding author: mingfeng@nankai.edu.cn
Received 14 June 2018; revised 25 July 2018; accepted 25 July 2018; posted 25 July 2018 (Doc. ID 335211); published 23 August 2018
We report a passively Q-switched and mode-locked erbium-doped fiber laser (EDFL) based on PtSe
2
, a new
two-dimensional material, as a saturable absorber (SA). Self-started Q-switching at 1560 nm in the EDFL was
achieved at a threshold pump power of 65 mW, and at the maximum pump power of 450 mW, the maximum
single Q-switched pulse energy is 143.2 nJ. Due to the polarization-dependent characteristics of the PtSe
2
-based
SA, the laser can be switched from the Q-switched state to the mode-locked state by adjusting the polarization
state. A mode-locked pulse train with a repetition rate of 23.3 MHz and a pulse width of 1.02 ps can be
generated when the pump power increases to about 80 mW, and the stable mode-locked state is maintained
until the pump power reaches its maximum 450 mW. The maximum single mode-locked pulse energy is
0.53 nJ. This is the first time to our knowledge that successful generation of stable Q-switched and mode-locked
pulses in an Er-doped fiber laser has been obtained by using PtSe
2
as a saturable absorber. © 2018 Chinese Laser
Press
OCIS codes: (140.3510) Lasers, fiber; (140.7090) Ultrafast lasers; (140.3380) Laser materials; (160.4670) Optical materials.
https://doi.org/10.1364/PRJ.6.000893
1. INTRODUCTION
Q-switching and mode-locking are two main ways to generate
pulses [1–4]. Among the two technologies, saturable absorbers
(SAs) play a vital role in passive Q-switching and mode-locking
[5–13]. Fiber lasers have the advantages of simple structure,
small size, low price, and high environmental stability [12–17].
Therefore, it is clear that the development of pulsed lasers
depends greatly on the development of saturable absorbing
materials. Traditional SAs, such as semiconductor saturable
absorber mirrors (SESAM), face many defects, such as narrow
working bandwidth and complex manufacturing packages,
which greatly limit the developm ent of pulsed lasers. With
the advancement of material science, new nanomaterials such
as carbon nanotubes (CNTs) [8,9], graphene [10–12], gra-
phene oxide [13], black phosphorus (BP) [17,18], and topo-
logical insulators (TI) [19–22] have emerged one after another,
and their performance has been qualitatively improved as their
prices have declined. Recently, transition-metal dichalcogenides
(TMDs) (e.g., MoS
2
[23], WS
2
[24,25], TiS
2
[26], MoTe
2
[27,28]) have attracted much attention from laser researchers
due to their thickness-dependent band gap and unique absorp-
tion property [29 ,30]. PtSe
2
also attracts our attention as a
new member of the layered TMDs family [31–35]. PtSe
2
’s
characteristic of having a widely tunable band gap allows it
to effectively respond to near-infrared light, and its photo-
responsivity is comparable with that of BP [36]. Monolayer
PtSe
2
has an indirect band gap of about 1.2 eV, while the band
gap of double-layered PtSe
2
is reduced to 0.21 eV. Three or
more layers of PtSe
2
have a zero band gap, and the macroscopic
properties are represented by semimetals [31]. Compared to
MoS
2
, a TMD material that has been widely studied in the
field of laser mode-locking, PtSe
2
has a higher carrier mobility
that is comparable to that of graphene [35–38]. Therefore, it
can produce a fast nonlinear response to incident light and can
achieve narrower pulses. In addition, the narrower energy band
gap of PtSe
2
allows it to have nonlinear effects in a wider wave-
length range. Moreover, the characteristics of the zero bandgap
of multi-layered PtSe
2
and the high carrier mobility are similar
to graphene, although there is a large difference in the band
structures. Therefore, PtSe
2
has the potential to substitute for
graphene as an excellent SA.
In this paper, we report an erbium-doped fiber laser (EDFL)
based on PtSe
2
as an SA with obvious polarization-dependent
saturable absorption, and we have obtained both passive
Q-switching and mode-locking pulses. As far as we know,
Research Article
Vol. 6, No. 9 / September 2018 / Photonics Research 893
2327-9125/18/090893-07 Journal © 2018 Chinese Laser Press
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