Contents
2018
Volume: 6 Issue 10
16 Article(s)
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TWO DIMENSIONAL LAYERED MATERIALS FOR ULTRAFAST LASERS (INVITATION ONLY)
Introduction to two-dimensional layered materials for ultrafast lasers
Han Zhang, Qiaoliang Bao, and Zhipei Sun
We introduce the background and motivation of this feature issue of two-dimensional layered materials for ultrafast lasers. A brief summary of the seven collected articles in this feature issue is also given.
We introduce the background and motivation of this feature issue of two-dimensional layered materials for ultrafast lasers. A brief summary of the seven collected articles in this feature issue is also given.
.Photonics Research
- Publication Date: Oct. 01, 2018
- Vol. 6, Issue 10, TDL1 (2018)
Graphene-decorated microfiber knot as a broadband resonator for ultrahigh-repetition-rate pulse fiber lasers
Meng Liu, Rui Tang, Ai-Ping Luo, Wen-Cheng Xu, and Zhi-Chao Luo
Searching for an ultrahigh-repetition-rate pulse on the order of hundreds of gigahertz (GHz) is still a challenging task in the ultrafast laser community. Recently, high-quality silicon/silica-based resonators were exploited show moreSearching for an ultrahigh-repetition-rate pulse on the order of hundreds of gigahertz (GHz) is still a challenging task in the ultrafast laser community. Recently, high-quality silicon/silica-based resonators were exploited to generate a high-repetition-rate pulse based on the filter-driven four-wave mixing effect in fiber lasers. However, despite their great performance, the silicon/silica-based resonators still have some drawbacks, such as single waveband operation and low coupling efficiency between the fiber and resonators. To overcome these drawbacks, herein we proposed an all-fiber broadband resonator fabricated by depositing the graphene onto a microfiber knot. As a proof-of-concept experiment, the graphene-deposited broadband microfiber knot resonator (MKR) was applied to Er- and Yb-doped fiber lasers operating at two different wavebands, respectively, to efficiently generate hundreds-of-GHz-repetition-rate pulses. Such a graphene-deposited broadband MKR could open some new applications in ultrafast laser technology, broadband optical frequency comb generation, and other related fields of photonics..
Photonics Research
- Publication Date: Jul. 26, 2018
- Vol. 6, Issue 10, C1 (2018)
Nonlinear optical properties of WSe2 and MoSe2 films and their applications in passively Q-switched erbium doped fiber lasers
Wenjun Liu, Mengli Liu, Hainian Han, Shaobo Fang... and Zhiyi Wei|Show fewer author(s)
Transition metal dichalcogenides (TMDs) are successfully applied in fiber lasers for their photoelectric properties. However, in previous work, how to improve the modulation depth of TMD-based saturable absorbers (SAs) has been a challenging issue. In this paper, WSe2 and MoSe2 SAs are fabricated with the chemical vapor deposition method. Compared with previous experiments, the modulation depths of WSe2 and MoSe2 SAs with sandwiched structures are effectively increased to 31.25% and 25.69%, respectively. The all-fiber passively Q-switched erbium doped fiber lasers based on WSe2 and MoSe2 SAs are demonstrated. The signal-to-noise ratios of those lasers are measured to be 72 and 57 dB, respectively. Results indicate that the proposed WSe2 and MoSe2 SAs are efficient photonic devices to realize stable fiber lasers.Transition metal dichalcogenides (TMDs) are successfully applied in fiber lasers for their photoelectric properties. However, in previous work, how to improve the modulation depth of TMD-based saturable absorbers (SAs) has been a challenging issue. In this paper, WSe 2 MoSe 2 WSe 2 MoSe 2 Q WSe 2 MoSe 2 WSe 2 MoSe 2
Photonics Research
- Publication Date: Aug. 07, 2018
- Vol. 6, Issue 10, C15 (2018)
Thermo-optic all-optical devices based on two-dimensional materials
Kan Wu, Yifang Wang, Ciyuan Qiu, and Jianping Chen
In this paper, we review our recent work on thermo-optic all-optical devices based on two-dimensional (2D) materials. The unique properties of 2D materials enable fast and highly efficient thermo-optic control of light. A few all-optical devices are demonstrated based on various thermo-optic mechanisms. Both fiber and integrated devices will be shown.In this paper, we review our recent work on thermo-optic all-optical devices based on two-dimensional (2D) materials. The unique properties of 2D materials enable fast and highly efficient thermo-optic control of light. A few all-optical devices are demonstrated based on various thermo-optic mechanisms. Both fiber and integrated devices will be shown..
Photonics Research
- Publication Date: Aug. 21, 2018
- Vol. 6, Issue 10, C22 (2018)
212-kHz-linewidth, transform-limited pulses from a single-frequency Q-switched fiber laser based on a few-layer Bi2Se3 saturable absorber
Weiwei Li, Jinhai Zou, Yizhong Huang, Kaijie Wang... and Zhengqian Luo|Show fewer author(s)
Conventional Q-switched fiber lasers operating at multi-longitudinal-mode oscillation usually suffer from self-mode-locking-induced temporal instability, relatively strong noise, and low coherence. Here, we address the challeshow moreConventional Q Q Bi 2 Se 3 Bi 2 Se 3 ～ 5 % 1.8 MW / cm 2 Q Q Q
Photonics Research
- Publication Date: Aug. 27, 2018
- Vol. 6, Issue 10, C29 (2018)
Femtosecond mode-locking of a fiber laser using a CoSb3-skutterudite-based saturable absorber
Jinho Lee, Yoontaek Kim, Kyungtaek Lee, and Ju Han Lee
We experimentally demonstrate an ultrafast mode-locker based on a CoSb3 skutterudite topological insulator for femtosecond mode-locking of a fiber laser. The mode-locker was implemented on a side-polished fiber platform by deshow moreWe experimentally demonstrate an ultrafast mode-locker based on a CoSb 3 CoSb 3 / PVA ～ 5 % ～ 8.7 W ～ 2.8 % ～ 10.6 W ～ 833 fs ～ 3.44
Photonics Research
- Publication Date: Sep. 10, 2018
- Vol. 6, Issue 10, C36 (2018)
TiS2-based saturable absorber for ultrafast fiber lasers
X. Zhu, S. Chen, M. Zhang, L. Chen... and H. Zhang|Show fewer author(s)
We fabricate titanium disulfide (TiS2) using a liquid exfoliation method and subsequently a TiS2-based device by optically depositing the TiS2 material onto the microfiber. This device exhibits a strong nonlinear saturable absorption property with an optical modulation depth of 8.3% at 1560 nm. With the implementation of this all-fiber TiS2-based saturable absorber, we demonstrate that both mode-locking and Q-switching operation can be obtained in a turn-key all-fiber erbium-doped laser cavity. Our findings constitute the first example, to the best of our knowledge, of a TiS2-based saturable absorber for ultrashort pulse generation and highlight the great potential of such devices in two-dimensional nanomaterials-related photonics.We fabricate titanium disulfide (TiS 2 TiS 2 TiS 2 TiS 2 Q TiS 2
Photonics Research
- Publication Date: Sep. 26, 2018
- Vol. 6, Issue 10, C44 (2018)
Saturated absorption of different layered Bi2Se3 films in the resonance zone
Jun Zhang, Tian Jiang, Tong Zhou, Hao Ouyang... and Xiang’ai Cheng|Show fewer author(s)
Here, we used the micro P-scan method to investigate the saturated absorption (SA) of different layered Bi2Se3 continuous films. Through resonance excitation, first, we studied the influence of the second surface state (SS) oshow moreHere, we used the micro P-scan method to investigate the saturated absorption (SA) of different layered
Photonics Research
- Publication Date: Aug. 02, 2018
- Vol. 6, Issue 10, C8 (2018)
Research Articles
Integrated Optics
High-efficiency and broadband four-wave mixing in a silicon-graphene strip waveguide with a windowed silica top layer
Yuxing Yang, Zhenzhen Xu, Xinhong Jiang, Yu He... and Yikai Su|Show fewer author(s)
We experimentally demonstrate high-efficiency and broadband four-wave mixing in a silicon-graphene strip waveguide. A four-wave mixing conversion efficiency of 38.7 dB and a 3-dB conversion bandwidth of 35 nm are achieved in the silicon-graphene strip waveguide with an optimized light-graphene interaction length of 60 μm. The interaction length is controlled by a windowed area of silica layer on the silicon waveguide. Numerical simulations and experimental studies are carried out and show a nonlinear parameter γGOS as large as 104 W 1 ·m 1.We experimentally demonstrate high-efficiency and broadband four-wave mixing in a silicon-graphene strip waveguide. A four-wave mixing conversion efficiency of 38.7 dB γ GOS 10 4 W 1 · m 1
Photonics Research
- Publication Date: Sep. 18, 2018
- Vol. 6, Issue 10, 965 (2018)
Lasers and Laser Optics
Integration of nanoscale light emitters: an efficient ultraviolet and blue random lasing from NaYF4:Yb/Tm hexagonal nanocrystals
Ya-Pei Peng, Wei Lu, Pengpeng Ren, Yiqun Ni... and Shuangchen Ruan|Show fewer author(s)
Near infrared light-controlled release of payloads from ultraviolet-sensitive (UV-sensitive) polymer hydrogels or nanocarriers is one of the most promising strategies for biotherapy. Here, we propose the concept of light actishow moreNear infrared light-controlled release of payloads from ultraviolet-sensitive (UV-sensitive) polymer hydrogels or nanocarriers is one of the most promising strategies for biotherapy. Here, we propose the concept of light activation of NaYF 4 : 20 % Yb , 2 % Tm NaYF 4 : 20 % Yb , 2 % Tm NaYF 4 : 20 % Yb , 2 % Tm NaYF 4 : 20 % Yb , 2 % Tm NaYF 4 : Yb , Tm
Photonics Research
- Publication Date: Sep. 07, 2018
- Vol. 6, Issue 10, 943 (2018)
Passively Q-switched femtosecond-laser-written thulium waveguide laser based on evanescent field interaction with carbon nanotubes
Esrom Kifle, Pavel Loiko, Javier Rodríguez Vázquez de Aldana, Carolina Romero... and Xavier Mateos|Show fewer author(s)
Surface channel waveguides (WGs) were fabricated in a monoclinic Tm3+:KLu(WO4)2 crystal by femtosecond direct laser writing (fs-DLW). The WGs consisted of a half-ring cladding with diameters of 50 and 60 μm located just beneashow moreSurface channel waveguides (WGs) were fabricated in a monoclinic Tm 3 + : KLu ( WO 4 ) 2 μ η 0.7 ± 0.3 dB / cm Q η = 34.6 %
Photonics Research
- Publication Date: Sep. 26, 2018
- Vol. 6, Issue 10, 971 (2018)
Materials
Anomalous transport of light at the phase transition to localization: strong dependence with incident angle
Ernesto Jimenez-Villar, M. C. S. Xavier, Niklaus U. Wetter, Valdeci Mestre... and Gilberto F. de Sá|Show fewer author(s)
There has been a growing interest in disordered optical media in recent years due to their potential applications in solar collectors, random lasers, light confinement, and other advanced photonic functions. This paper studies the transport of light for different incidence angles in a strongly disordered optical medium composed of core-shell TiO2@Silica nanoparticles suspended in an ethanol solution. A decrease of optical conductance and an increase of absorption near the input border are reported when the incidence angle increases. The specular reflection, measured for the photons that enter the sample, is lower than the effective internal reflection undergone by the coherently backscattered photons in the exact opposite direction, indicating a nonreciprocal propagation of light. This study represents a novel approach in order to understand the complex physics involved at the phase transition to localization.There has been a growing interest in disordered optical media in recent years due to their potential applications in solar collectors, random lasers, light confinement, and other advanced photonic functions. This paper studies the transport of light for different incidence angles in a strongly disordered optical medium composed of core-shell TiO 2
Photonics Research
- Publication Date: Sep. 07, 2018
- Vol. 6, Issue 10, 929 (2018)
Nonlinear Optics
Soliton regulation in microcavities induced by fundamental–second-harmonic mode coupling
Xiaoxiao Xue, Xiaoping Zheng, and Bingkun Zhou
Microcomb generation with simultaneous χ(2) and χ(3) nonlinearities brings new possibilities for ultrabroadband and potentially self-referenced integrated comb sources. However, the evolution of the intracavity field involvinshow moreMicrocomb generation with simultaneous χ ( 2 ) χ ( 3 ) χ ( 2 ) χ ( 3 )
Photonics Research
- Publication Date: Sep. 10, 2018
- Vol. 6, Issue 10, 948 (2018)
Broadband quasi-phase matching in a MgO:PPLN thin film
Licheng Ge, Yuping Chen, Haowei Jiang, Guangzhen Li... and Xianfeng Chen|Show fewer author(s)
Future quantum information networks operated on telecom channels require qubit transfer between different wavelengths while preserving quantum coherence and entanglement. Qubit transfer is a nonlinear optical process, but curshow moreFuture quantum information networks operated on telecom channels require qubit transfer between different wavelengths while preserving quantum coherence and entanglement. Qubit transfer is a nonlinear optical process, but currently the types of atoms used for quantum information processing and storage are limited by the narrow bandwidth of upconversion available. Here we present the first experimental demonstration of broadband and high-efficiency quasi-phase matching second-harmonic generation (SHG) in a chip-scale periodically poled lithium niobate thin film. We achieve a large bandwidth of up to 2 THz for SHG by satisfying quasi-phase matching and group-velocity matching simultaneously. Furthermore, by changing the film thickness, the central wavelength of the quasi-phase matching SHG bandwidth can be modulated from 2.70 μm to 1.44 μm. The reconfigurable quasi-phase matching lithium niobate thin film provides a significant on-chip integrated platform for photonics and quantum optics..
Photonics Research
- Publication Date: Sep. 13, 2018
- Vol. 6, Issue 10, 954 (2018)
Nonlinear distortion and spatial dispersion of intense terahertz generation in lithium niobate via the tilted pulse front technique
Baolong Zhang, Shangqing Li, Shusu Chai, Xiaojun Wu... and Yutong Li|Show fewer author(s)
We systematically investigate the influences of the input infrared spectrum, chirp, and polarization on the emitted intense terahertz spectrum and spatial dispersion in lithium niobate via optical rectification. The terahertz yield and emission spectrum depend on both the chirp and spectrum of the input pump laser pulses. We also observe slight non-uniform spatial dispersion using a knife-edge measurement, which agrees well with the original predictions. The possible mechanism is the nonlinear distortion effect caused by high-energy laser pumping. Our study is very important and useful for developing intense terahertz systems with applications in extreme terahertz sciences and nonlinear phenomena.We systematically investigate the influences of the input infrared spectrum, chirp, and polarization on the emitted intense terahertz spectrum and spatial dispersion in lithium niobate via optical rectification. The terahertz yield and emission spectrum depend on both the chirp and spectrum of the input pump laser pulses. We also observe slight non-uniform spatial dispersion using a knife-edge measurement, which agrees well with the original predictions. The possible mechanism is the nonlinear distortion effect caused by high-energy laser pumping. Our study is very important and useful for developing intense terahertz systems with applications in extreme terahertz sciences and nonlinear phenomena..
Photonics Research
- Publication Date: Sep. 18, 2018
- Vol. 6, Issue 10, 959 (2018)
Plasmonics
Sequential trapping of single nanoparticles using a gold plasmonic nanohole array
Xue Han, Viet Giang Truong, Prince Sunil Thomas, and Síle Nic Chormaic
We have used a gold nanohole array to trap single polystyrene nanoparticles, with a mean diameter of 30 nm, into separated hot spots located at connecting nanoslot regions. A high trap stiffness of approximately 0.85 fN/(nm·mW) at a low-incident laser intensity of ～0.51 mW/μm2 at 980 nm was obtained. The experimental results were compared to the simulated trapping force, and a reasonable match was achieved. This plasmonic array is useful for lab-on-a-chip applications and has particular appeal for trapping multiple nanoparticles with predefined separations or arranged in patterns in order to study interactions between them.We have used a gold nanohole array to trap single polystyrene nanoparticles, with a mean diameter of 30 nm, into separated hot spots located at connecting nanoslot regions. A high trap stiffness of approximately 0.85 fN / ( nm · mW ) ～ 0.51 mW / μm 2
Photonics Research
- Publication Date: Oct. 01, 2018
- Vol. 6, Issue 10, 981 (2018)
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