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Thermal Tuning of High-T_{c} Superconducting Bi_{2}Sr _{2}CaCu_{2} O_{8+\delta } Terahertz Metamaterial
S. Kalhor;M. Ghanaatshoar;T. Kashiwagi;K. Kadowaki;M. J. Kelly;K. Delfanazari
Publication Year: 2017,Article Sequence Number: 1400308
Cited by: Papers (27)
We introduce a class of low-loss subwavelength resonators and report the first demonstration of a high-temperature ( $T_{c}$) superconducting Bi $_{2}$Sr$_{2}$ CaCu$_{2}$O $_{8+\delta }$ (BSCCO) terahertz (THz) metamaterial. The numerical simulations and analytical calculations are performed to study the electromagnetic response of the subwavelength BSCCO split-ring resonators (SRRs) to the incide...Show More
Generation of Orthogonally Polarized Mode-Locked Lasers at Wavelength of 1342 nm
Hsing-Chih Liang;Feng-Lan Chang;Tai-Wei Wu;Cheng-Lin Sung;Yung-Fu Chen
Publication Year: 2017,Article Sequence Number: 1504908
Cited by: Papers (1)
A mode-locked laser with orthogonal polarization at the wavelength of 1342 nm is experimentally achieved by using the natural birefringence of the Nd:YVO4 crystal. A total output power of 2.64 W could be obtained at an incident power of 14.4 W and the pulse durations are measured to be 15.1 and 16.9 ps with pulse repetition rates of 6.0 and 6.45 GHz for the laser output along the π- and σ-polariza...Show More
20 GHz Mode-Locked Laser Diodes With Integrated Optical Feedback Cavities in a Generic Monolithic InP Photonics Platform
Publication Year: 2017,Article Sequence Number: 1505010
Cited by: Papers (7)
We investigate integrated mode-locked laser diodes with distributed Bragg reflectors fabricated in the JePPIX-Oclaro indium phosphide photonics platform. The optical and radio-frequency (RF) characteristics of passively mode-locked lasers with and without monolithically integrated feedback cavities were measured and compared. The RF linewidth of the mode-locked laser could be reduced by integratin...Show More
Exploring High Quality Chaotic Signal Generation in a Mutually Delay Coupled Semiconductor Lasers System
Publication Year: 2017,Article Sequence Number: 1505110
Cited by: Papers (6)
High quality chaotic signal generation in a mutually delay coupled semiconductor lasers (MDC-SLs) system is numerically explored by evaluating the time-delay signature (TDS) and complexity of chaotic signals. Autocorrelation function is utilized for quantitatively identifying the TDS of chaotic signal, and Kolmogorov–Sinai entropy and Kaplan–York dimensions are applied to estimate the complexity o...Show More
Compact Polygonal Active-Mirror Laser With Composite Nd:YAG/YAG Gain Medium
Yanzhong Chen;Ye Lang;Lifen Liao;Zhongwei Fan;Jianguo He;Guangyan Guo;Weiran Lin;Yunfeng Ma;Hongbo Zhang;Jian Zhang
Publication Year: 2017,Article Sequence Number: 1505208
Cited by: Papers (2)
A compact polygonal active-mirror (PAM) laser with composite Nd: YAG/YAG multithin-disk gain medium has been demonstrated with total internal reflection scheme. Five Nd:YAG thin disks with a neodymium concentration of 0.7 at.% and thickness of ∼0.2 mm were bonded to five different surfaces of a hexagonal YAG substrate. With no heat sink, output power of 1.03 W at 1064 nm and beam quality of M2 = 1...Show More
Analysis of Leakage Loss in Silicon Photonics with Finite Gain Compensation
Publication Year: 2017,Article Sequence Number: 1505310
Cited by: Papers (3)
Silicon waveguides fabricated on silicon-on-insulator wafers are leaky in nature. This fact puts a lower bound on the insulator thickness in silicon photonic structures as integrated with compact electronic devices. We examine this constraint from the angle of finite gain compensation for leakage loss using III-V semiconductor gain media bonded to passive silicon waveguides. With a reasonable magn...Show More
Analysis of Leakage Loss in Silicon Photonics with Finite Gain Compensation
Year: 2017 | Volume: 9 | Issue: 5
Correlated Random Bit Generation Using Chaotic Semiconductor Lasers Under Unidirectional Optical Injection
Publication Year: 2017,Article Sequence Number: 1505411
Cited by: Papers (18)
Correlated random bit generation is investigated using three optically injected chaotic semiconductor lasers. Based on a rate-equation model, a continuous-wave injection first perturbs a common laser into chaos. The common laser then optically injects a pair of response lasers through a public channel unidirectionally. The two response lasers of identical parameters are synchronized. Their chaotic...Show More
Frequency Doubling of a Pulsed Wavelength-Agile Erbium-Doped Fiber MOPA for Oxygen A-Band Spectroscopy
Publication Year: 2017,Article Sequence Number: 1505508
We report a pulsed wavelength-agile laser near 765 nm, which was frequency doubled from an erbium-doped fiber amplifier for oxygen A-band spectroscopy. A single frequency distributed feedback laser around 1529.6 nm was employed as the seed. After three stages of amplification, its average power was boosted to 610 mW and was then frequency doubled via a 15-mm-long MgO:PPLN crystal with the highest ...Show More
Concealment of Chaos Time-Delay Signature Through Phase-Conjugate Feedback and Chaos Optical Injection
Publication Year: 2017,Article Sequence Number: 1505608
Cited by: Papers (7)
In this paper, we numerically demonstrate that the concealment of time-delay signature (TDS) can be readily achieved via the combined mechanism of phase-conjugate feedback (PCF) and chaotic optical injection. To show the potential advantages of the proposed scheme, its counterpart, i.e., a slave semiconductor laser (SSL) subjected to chaotic optical injection from a master semiconductor laser (MSL...Show More
Coherence in Multielement-Phased Vertical-Cavity Surface-Emitting Laser Arrays Using Resonance Tuning
Bradley J. Thompson;Zihe Gao;Stewart T. M. Fryslie;Matthew T. Johnson;Dominic F. Siriani;Kent D. Choquette
Publication Year: 2017,Article Sequence Number: 1505708
Cited by: Papers (7)
We show that optical coupling can be achieved reproducibly and with high yield by resonance tuning the elements of substrate-emitting and top-emitting vertical-cavity surface-emitting laser arrays. The resonance tuning is enabled by electrical isolation of the lasing elements in the array, which in this paper is done by post fabrication processing. Prior to electrical isolation, the laser arrays e...Show More
Real-Time Experimental Measurement of Swept Source VCSEL Properties Relevant to OCT Imaging
T. P. Butler;S. Slepneva;P. M. McNamara;K. Neuhaus;D. Goulding;M. Leahy;G. Huyet
Publication Year: 2017,Article Sequence Number: 1505810
Cited by: Papers (9)
A real-time study of the dynamic properties of a frequency swept vertical cavity surface emitting laser (VCSEL) is presented. Such tunable laser sources have previously been shown to provide long coherence lengths and improved performance in metrology and imaging applications. Single-shot interferometric reconstruction of both the phase and intensity of the swept source allows for experimental mea...Show More
All-Optical Actively Mode-Locked Fiber Laser at 2-μm Based on Interband Modulation
Xu Wu;Zhichao Wu;Tianye Huang;Bingwei Chen;Kaixuan Ren;Songnian Fu
Publication Year: 2017,Article Sequence Number: 1505908
Cited by: Papers (6)
In this paper, we have achieved a high repetition rate and tunable pulse generation near ∼2 μm through an all-optical actively mode-locked fiber laser. The performances of the fiber laser have been systematically investigated through numerical simulations. The thulium-doped fiber laser cavity is modulated by the optical injection at 1.55 μm via a nonlinear optical loop mirror in which a specially-...Show More
High-Power Narrow-Linewidth Tunable 670.8-nm Master Oscillator Power Amplifier With High Efficiency
Hao Wu;Hangyu Peng;Jun Zhang;Jinlong Zhang;Hongbo Zhu;Yongqiang Ning
Publication Year: 2017,Article Sequence Number: 1506006
A highly efficient 670.8-nm high-power narrow-linewidth wavelength-tunable laser source with master oscillator power amplifier structure is demonstrated, which yielded CW output power of 4.5 W with spectral linewidth of 0.3 pm and mode-hop free tuning range of 52 pm (35 GHz). The total conversion efficiency of 20% was achieved. The developed narrow-linewidth tunable laser source can provide better...Show More
5 kW Near-Diffraction-Limited and 8 kW High-Brightness Monolithic Continuous Wave Fiber Lasers Directly Pumped by Laser Diodes
Qiang Fang;Jinhui Li;Wei Shi;Yuguo Qin;Yang Xu;Xiangjie Meng;Robert A. Norwood;Nasser Peyghambarian
Publication Year: 2017,Article Sequence Number: 1506107
Cited by: Papers (45)
Tandem pumping technique are traditionally adopted to develop >3-kW continuous-wave (cw) Yb3+-doped fiber lasers, which are usually pumped by other fiber lasers at shorter wavelengths (1018 nm e.g.,). Fiber lasers directly pumped by laser diodes have higher wall-plug efficiency and are more compact. Here we report two high brightness monolithic cw fiber laser sources at 1080 nm. Both lasers consis...Show More
Passively Q-Switched Ho,Pr:LiLuF4 Laser at 2.95 μm Using MoSe2
Zhengyu Yan;Guoqiang Li;Tao Li;Shengzhi Zhao;Kejian Yang;Shuaiyi Zhang;Mingqi Fan;Lei Guo;Baitao Zhang
Publication Year: 2017,Article Sequence Number: 1506207
Cited by: Papers (9)
In this letter, we report a diode-end-pumped continuous wave (CW) and passively Q-switched Ho,Pr:LLF laser at 2.95 μm. A maximum CW output power of 98 mW was achieved. The highest output power of 58 mW was radiated with a pulse duration of 818.8 ns and a repetition rate of 71.05 kHz. Even shorter pulse duration of 731.5 ns was obtained at a minor output coupler transmission.Show More
Experimental Demonstration of the Distributed Feedback Semiconductor Laser With S-Bent Waveguide and Sampled Grating
Yunshan Zhang;Yuechun Shi;Lianyan Li;Zhengpeng Zou;Jun Lu;Yinchao Du;Wenxuan Wang;Yating Zhou;Xin Chen;Jilin Zheng;Xiangfei Chen
Publication Year: 2017,Article Sequence Number: 1506311
A distributed feedback (DFB) semiconductor laser based on s-bent waveguide and sampled grating is theoretically studied and experimentally demonstrated. The proposed laser operates with a high side mode suppression ratio (SMSR) when the bias current is changed from 50 to 130 mA. When the bias current is fixed at 130 mA, the SMSR is larger than 55 dB, which is benefit from the suppressed spatial ho...Show More
Brillouin Backscattering Light Properties of Chaotic Laser Injecting Into an Optical Fiber
Publication Year: 2017,Article Sequence Number: 1600610
Cited by: Papers (7)
Laser diode-based optical chaos is attractive for the fundamental physics as well as practical tasks in such as secure communications, random number generation, and fiber sensing. The characteristics of Brillouin backscattering light generated by injecting a chaotic laser into a single mode fiber have been investigated experimentally. The Brillouin backscattering light still has the chaotic proper...Show More
Effects of Inclined Sidewall Structure With Bottom Metal Air Cavity on the Light Extraction Efficiency for AlGaN-Based Deep Ultraviolet Light-Emitting Diodes
Yonghui Zhang;Ruilin Meng;Zi-Hui Zhang;Qiang Shi;Luping Li;Guoxu Liu;Wengang Bi
Publication Year: 2017,Article Sequence Number: 1600709
Cited by: Papers (15)
An inclined sidewall scattering structure with air cavity characterized by a metal bottom and flat parallel top (Bottom_metal) is proposed to enhance the light extraction efficiency (LEE) for AlGaN-based deep ultraviolet light-emitting diodes (DUV LEDs). Compared to the reported sidewall metal inclined sidewall (Sidewall_metal) structure, the Bottom_metal structure can greatly enhance the LEE of D...Show More
Graphene Oxide Doped SU-8 Waveguide and Its Application as Saturable Absorber
Khairul Zafri Mustafa;Wu Yi Chong;Mohd Haniff Ibrahim;Yuen Kiat Yap;Fauzan Ahmad;Choon Kong Lai;Nur Afiqah Mohd Ariffin;Harith Ahmad
Publication Year: 2017,Article Sequence Number: 2201207
Cited by: Papers (4)
Graphene oxide (GO)-doped SU-8 waveguides have been fabricated and characterized. The GO-doped SU-8 can be processed using standard photolithography parameters. The optical characteristics of the developed waveguides are determined using fibre-butt coupling and cut-back method. Propagation loss of 1.9 dB/cm and a coupling loss of 4 dB per point measured at 1550 nm wavelength are obtained. Q-switch...Show More
Filtering Property Based on Ultra-Wide Stopband in Double Sector/Sectorial-Ring Stub Resonator Coupled to Plasmonic Waveguide
Mingfei Zheng;Hongjian Li;Hui Xu;Zhihui He;Zhiquan Chen;Mingzhuo Zhao
Publication Year: 2017,Article Sequence Number: 2201308
Cited by: Papers (11)
A double sector or sectorial-ring stub resonator coupled to a plasmonic waveguide is proposed and investigated. This resonator is built with two same stubs that are symmetrically arranged together, which has the advantages of realizing asymmetrical single stub and forming no-distance double stub. The characteristic spectral responses of the two novel systems are simulated by using the finite-diffe...Show More
Tailorable Elastomeric Grating With Tunable Groove Density Gradient
Bin Sheng;Luwen Luo;Yuanshen Huang;Guohua Chen;Hongyan Zhou;Dawei Zhang;Songlin Zhuang
Publication Year: 2017,Article Sequence Number: 2400406
Cited by: Papers (5)
This paper describes a new method for fabrication of tailorable elastomeric gratings with tunable groove density gradients based on stretching of the grating sample in a direction perpendicular to the grating line within the grating surface. The advantage of this method is that the tunable groove density gradient can be achieved by tailoring of the shape of a grating sample with uniform thickness....Show More
Optically-Pumped Single-Mode Deep-Ultraviolet Microdisk Lasers With AlGaN-Based Multiple Quantum Wells on Si Substrate
Yiyun Zhang;Hongjian Li;Panpan Li;Arash Dehzangi;Liancheng Wang;Xiaoyan Yi;Guohong Wang
Publication Year: 2017,Article Sequence Number: 2400508
Cited by: Papers (3)
In this work, we report demonstration of optically-pumped single-mode deep-ultraviolet lasing actions operating at room temperature from ∼1-μm 150-nm-thick undercut microdisks with AlN/Al0.35Ga 0.65N (5.5 nm/2.5 nm) multiple quantum wells. These AlGaN-based microdisks are grown on Si substrate by metal-organic chemical vapor deposition. The lasing wavelength centers at ∼300.1 nm with the linewidth...Show More
Deuterated SiN/SiON Waveguides on Si Platform and Their Application to C-Band WDM Filters
Publication Year: 2017,Article Sequence Number: 2500207
Cited by: Papers (50)
We describe low-loss SiN/SiON waveguides for wavelength-division-multiplexing filters on a Si platform. The key technology is a low-temperature deposition of refractiveindex-controllable SiN/SiON films by using a hydrogen-free gas source (SiD4), which avoids the strong optical absorption due to N-H bond. Using this technology, we demonstrate a low-loss ring resonator with a SiN waveguide, whose lo...Show More
830-nm InGaAs Quantum Well Lasers With Very Low Beam Divergence
Bocang Qiu;Hai Martin Hu;Weimin Wang;James Ho;Wenbin Liu;Langxing Kuang;Taishan Wang;Shujuan Wu
Publication Year: 2017,Article Sequence Number: 2500308
We report on our design and fabrication of 830-nm high-power semiconductor lasers with very low beam divergence. Here, we propose a novel approach in which by combining asymmetric waveguide and a feature called “pins” together, we were able to design an optimize epi structure, which not only produces a beam divergence of less than 16°, which is measured at the full width at the half maximum, but a...Show More
Dispersion Engineering in Single-Polarization Single-Mode Photonic Crystal Fibers for a Nearly Zero Flattened Profile
Publication Year: 2017,Article Sequence Number: 2700708
Cited by: Papers (4)
We propose a systematic solution to the problem on dispersion engineering in single-polarization single-mode (SPSM) photonic crystal fibers (PCFs) for a nearly zero flattened profile. Based on dispersion-approximating and -normalizing methods as well as a clever engineering strategy, we have succeeded in a design of SPSM PCF with nearly zero flattened dispersion ${\text{0.82}}\pm {\text{0.30}}\,\t...Show More
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