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| 1 | Nonlinear photoresponse of metallic graphene-like VSe2 ultrathin nanosheets for pulse laser generation显示文摘Vanadium diselenide(VSe2), a typical metallic behaviour material among transition metal dichalcogenides(TMDCs) family, exhibits excellent photoelectric characteristics with a zero band gap, missing applicaiotn in pulse generation. In this work, a high-quality VSe2 saturable absorber(SA) was synthesized through a liquid-phase exfoliation method. The saturable absorption of obtained VSe2-SA was characterized systematically. The measured modulation depth was 9.9%, and the saturated intensity was 533.8 μJ/cm2. By incorporating this optical modulator into a ytterbium-doped fiber laser cavity, a stable passively Q-switched laser could be achieved. The pulse had the central wavelength of 1064.03 nm. As the pump power was increased, the repetition rate increased from 24.3 k Hz to 35.6 k Hz, and the pulse duration decreased from7.21 μs to 5.27 μs. The output power had the maximum value of 28.55 m W. These results indicated that VSe2 is an effective candidate to generate pulse laser due to its excellent nonlinear optical properties and universal photoelectric response, which may advance the applications of VSe2-based nonlinear optics and photoelectric devices. | Tao WANG Xinyao SHI Jin WANG Yijun XU Jie CHEN Zhuo DONG Man JIANG Pengfei MA Rongtao SU Yanxing MA Jian WU Kai ZHANG Pu ZHOU | 2019 | Science China(Information Sciences)2019，62，12： | 3 |
| 2 | Investigation of nonlinear optical properties of rhenium diselenide and its application as a femtosecond mode-locker显示文摘We investigated the nonlinear optical properties of ReSe2. First, we measured the nonlinear absorption coefficient and the nonlinear refractive index of a ReSe2 thin film using open-aperture(OA) and closed-aperture(CA) Z-scan techniques. ReSe2 was shown to possess both saturable absorption and self-defocusing properties. The nonlinear absorption coefficient of ReSe2 was measured to be-5.67-0.35×103 cm^2∕GW, and its nonlinear refractive index was-2.81-0.13×10-2 cm^2∕GW at 1560 nm. Next, a fiberized saturable absorber(SA) based on ReSe2 was fabricated with a side-polished fiber platform and was tested as an ultrafast mode-locker capable of producing femtosecond pulses operating at a wavelength of 1560 nm. The estimated modulation depth and saturation power are 3.9% and 42 W, respectively, for the transverse electric mode, while they are 2.4% and 53 W for the transverse magnetic mode. Using the prepared SA, stable soliton pulses with a temporal width of 862 fs were produced from an erbium-doped fiber ring cavity. To the best of the authors’ knowledge, this is the first demonstration of using a ReSe2-based SA for femtosecond mode-locked pulse generation. | JINHO LEE KYUNGTAEK LEE SUHYOUNG KWON BUMSOO SHIN JU HAN LEE | 2019 | Photonics Research2019，7，9： | 1 |
| 3 | Ternary ReS_(2(1-x))Se_(2x) alloy saturable absorber for passively Q-switched and mode-locked erbium-doped all-fiber lasers显示文摘We report Q-switched and mode-locked erbium-doped all-fiber lasers using ternary ReS_(2(1-x))Se_(2x) as saturable absorbers(SAs). The modulation depth and saturable intensity of the film SA are 1.8% and 0.046 MW∕cm2.In Q-switched mechanism output, the pulse was centered at 1531.1 nm with maximum pulse energy and minimum pulse width of 28.29 nJ and 1.07 μs, respectively. In mode-locked operation, the pulse was centered at1561.15 nm with pulse width of 888 fs, repetition rate of 2.95 MHz, and maximum pulse energy of 0.275 nJ. To the best of our knowledge, this is the first report on the mode-locked Er^(3+)-doped fiber laser using ternary transition metal dichalcogenides. This work suggests prospective 2 D-material SAs can be widely used in versatile fields due to their attractive optoelectronic and tunable energy bandgap properties. | CHENXI DOU WEN WEN JUNLI WANG MENGYUAN MA LIMING XIE CHING-HWA HO ZHIYI WEI | 2019 | Photonics Research2019，7，3： | 1 |
| 4 | Recent development of saturable absorbers for ultrafast lasers [Invited]显示文摘As one of the greatest inventions in the 20 th century, ultrafast lasers have offered new opportunities in the areas of basic scientific research and industrial manufacturing. Optical modulators are of great importance in ultrafast lasers, which directly affect the output laser performances. Over the past decades, significant efforts have been made in the development of compact, controllable, repeatable, as well as integratable optical modulators(i.e., saturable absorbers). In this paper, we review the fundamentals of the most widely studied saturable absorbers, including semiconductor saturable absorber mirrors and low-dimensional nanomaterials. Then, different fabrication technologies for saturable absorbers and their ultrafast laser applications in a wide wavelength range are illustrated. Furthermore, challenges and perspectives for the future development of saturable absorbers are discussed and presented. The development of ultrafast lasers together with the continuous exploration of reliable saturable absorbers will open up new directions for the mass production of the nextgeneration optoelectronic devices. | 张梦羽 陈浩 尹金德 王金涛 王金章 闫培光 | 2021 | Chinese Optics Letters2021，19，8： | 1 |
| 5 | 双波长可切换方波类噪声锁模线形光纤激光器显示文摘采用非线性偏振旋转锁模技术,在线形腔光纤激光器获得双波长可切换方波类噪声锁模。通过调节腔参数,激光器在波长1530 nm和1563 nm处分别获得可切换单波长方波类噪声锁模,最大脉冲宽度分别为12 ns和26 ns,腔内最大的脉冲能量分别可达14.7 nJ和45.6 nJ。此外激光器还可在这两波长处实现双波长类噪声锁模,锁模脉冲呈阶梯形,最大脉宽为5 ns,阶梯形脉冲的产生主要源于不同中心波长处的方波脉冲叠加。实验结果有助于进一步理解线形腔光纤激光器中方波类噪声的产生机理和特性,并为多波长高能量光源的设计提供参考。 | 耿旭 汪徐德 潘婕妤 孙梦秋 杨思敏 | 2022 | 激光与红外2022，52，5： | 0 |
| 6 | Optical properties and applications of SnS_(2) SAs with different thickness显示文摘Q-switched lasers have occupied important roles in industrial applications such as laser marking,engraving,welding,and cutting due to their advantages in high pulse energy.Here,SnS_(2)-based Q-switched lasers are implemented.Consid-ering that SnS_(2) inherits the thickness sensitive optical characteristics of TMD,three kinds of SnS2 with different thick-ness are characterized in terms of nonlinearity and used to realize the Q-switched pulses under consistent implementa-tion conditions for comparison tests.According to the results,the influence of thickness variation on the nonlinear per-formance of saturable absorber,such as modulation depth and absorption intensity,and the influence on the correspond-ing laser are analyzed.In addition,compared with other traditional saturable absorbers,the advantage of SnS_(2) in realiz-ing ultrashort pulses is also noticed.Our work explores the thickness-dependent nonlinear optical properties of SnS_(2),and the rules found is of great reference value for the establishment of target lasers. | Mengli Liu Hongbo Wu Ximei Liu Yaorong Wang Ming Lei Wenjun Liu Wei Guo Zhiyi Wei | 2021 | Opto-Electronic Advances2021，4，10： | 0 |
| 7 | 光纤激光器中高斯脉冲输出特性影响因素的探究显示文摘基于耦合非线性薛定谔方程,论文数值研究了高斯脉冲在被动锁模光纤激光器中的演化,入射脉冲有快、慢两个偏振分量,两偏振方向的分量在传输过程中可以进行耦合。给出高斯脉冲演化特性与小信号增益系数和相位延迟的关系。通过比较分析得到,可以通过适当改变小信号增益或相位延迟来控制稳定传输过程中的脉冲宽度、单脉冲能量、脉冲光谱和脉冲功率。通过数值模拟,最终稳定输出中心波长为1550 nm的高斯脉冲。数值模拟结果为脉冲光纤激光器中获得更窄的脉冲宽度和更高的峰值功率脉冲提供了理论参考。 | 田小青 李晓辉 | 2021 | 聊城大学学报(自然科学版)2021，34，1： | 0 |
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