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High peak power subnanosecond pulse characteristics with different walls of CNTs in a doubly QML Nd:Lu0.15Y0.85VO4 laser

Shengzhi Zhao, Wenjing Tang, Guiqiu Li, Kejian Yang, Dechun Li, Tao Li, qiaowen chao, and Jia Zhao

Doc ID: 279038 Received 20 Oct 2016; Accepted 08 Dec 2016; Posted 09 Dec 2016  View: PDF

Abstract: By simultaneously employing both electro-optic (EO) modulator and carbon nanotube (CNT) as dual-loss-modulator, subnanosecond single mode-locking pulse underneath a Q-switched envelope with high peak power was generated from a doubly Q-switched and mode-locked (QML) Nd:Lu0.15Y0.85VO4 laser at1.06 μm for the first time. Different walls of CNTs in terms of single-walled CNTs (SWCNTs), double-walled CNTs (DWCNTs) and multi-walled CNTs (MWCNTs) were used as saturabe absorbers in the experiment to investigate the single mode-locking pulse characteristics. At the pump power of 10.72W, the maximum peak power of 1.312 MW was obtained with the DWCNT.

Sub-picosecond pulses in a self-starting mode-locked semiconductor-based figure-of-eight fiber laser

Salvador Balle, Daniel Chaparro Gonzalez, and Luca Furfaro

Doc ID: 275670 Received 09 Sep 2016; Accepted 06 Dec 2016; Posted 07 Dec 2016  View: PDF

Abstract: We have experimentally studied the mode-locking dynamics of a polarization-maintaining figure-of-eight laser which has a Semiconductor-Optical Amplifier as gain medium. Self-starting mode-locking at the fundamental repetition rate of 18 MHz is obtained at the lasing threshold, and further increasing the bias current leads to the progressive emission of additional optical pulses in each roundtrip and eventually to mode-locked emission at increasingly high harmonics of the fundamental repetition rate, up to 2.45 GHz. The intensity autocorrelation of the amplified mode-locked pulses has a full-width at half-maximum duration of 382 fs, which corresponds to a pulse duration of 247 fs

g-C3N4 as a new saturable absorber for the passively Q-switched Nd:LLF laser at 1.3 μm

Guiqiu Li, Xiaochun Gao, Shixia Li, Tao Li, and Houyi Ma

Doc ID: 278721 Received 17 Oct 2016; Accepted 06 Dec 2016; Posted 07 Dec 2016  View: PDF

Abstract: Two-dimensional (2D) graphite carbon nitride (g-C3N4) nanosheets have been successfully used as a saturable absorber (SA) in a passively Q-switched Nd:LLF laser at 1.3 μm, for the first time. Under an incident pump power of 9.97 W, the shortest pulse duration of 275 ns was acquired with the output power of 0.96 W and the pulse repetition rate of 154 kHz, resulting in a pulse energy of 6.2 µJ. In addition, the saturable absorption behaviors of 0D 12 nm g-C3N4 nanoparticles (g-C3N4-NPs) and 3D ordered mesoporous g-C3N4 (mpg-C3N4) were also observed, although their morphology and structure were quite different from 2D-g-C3N4. The experimental results emerge the potential application of g-C3N4 nanomaterials as SAs in Q-switched or mode-locked lasers.

Image recording in telluride suboxide thin film through controlling optical band gap

Jingsong Wei, Tao Wei, kui zhang, and Long Zhang

Doc ID: 278043 Received 03 Oct 2016; Accepted 30 Nov 2016; Posted 02 Dec 2016  View: PDF

Abstract: In this work, TeO0.13 thin films were prepared by reactive magnetron controlling sputtering method. Complex grayscale patterns were successfully fabricated on TeO0.13 thin films through laser direct writing method. Structural origin of TeO0.13 thin film was investigated for grayscale pattern formation. It is found that multiple grayscale levels are dependent on band gap energy of TeO0.13 thin films. Band gap energy changes lead to refractive index and reflectivity difference. Thus, grayscale tones can be formed. By accurately controlling laser energy, various band gaps can be generated in TeO0.13 thin films and colorful grayscale levels can be formed. Experimental results indicate that TeO0.13 thin film can be used as micro/nano artwork recording material.

Synthesis of High-Purity Ag Nanorods with Tunable Plasmonic Properties and Sensor Behavior

Haiying Xu, Caixia Kan, Changzong Miao, Changshun Wang, Jingjing Wei, Yuan Ni, Beibei Lu, and Daning Shi

Doc ID: 274630 Received 30 Aug 2016; Accepted 27 Nov 2016; Posted 29 Nov 2016  View: PDF

Abstract: Through anisotropic Ag overgrowth on the surface of Au nanobipyramids (AuNBPs), high-purity and size-controlled Ag nanorods (Au@AgNRs) are obtained by a simplified purification process. The diameters of the Au@AgNRs are determined by the size of the as-prepared AuNBPs, and the lengths of the Au@AgNRs are tunable using different amounts of Ag precursor in the growth solution. Surface enhanced Raman scattering (SERS) studies using Rhodamine-6G as a test molecule indicate that the Au@AgNRs have excellent sensing potential. The tunable optical properties and strong electromagnetic effect of the Au@AgNRs, along with their superior SERS signal enhancement, show that Au@AgNRs are promising for further applications in plasmon sensing and bio-molecular detection.

Generation of arbitrary vector vortex beams on hybrid-order Poincar\'{e} sphere

Hailu Luo, Zhenxing Liu, Yuanyuan Liu, Yougang Ke, Yachao Liu, Wei Shu, and Shuangchun Wen

Doc ID: 275720 Received 13 Sep 2016; Accepted 08 Nov 2016; Posted 11 Nov 2016  View: PDF

Abstract: We propose theoretically and verify experimentally a method of combing a q-plate and a spiral phase plate to generate arbitrary vector vortex beams on the hybrid-order Poincar\'{e} sphere. We demonstrate that a vector vortex beam can be decomposed into a vector beam and a vortex, whereby the generation can be realized by using a q-plate and a spiral phase plate, sequentially. The generated vector beam, vortex and vector vortex beam verified respectively, which show well agreement with the prediction. Another advantage should be pointed that spiral phase plate and $q$-plate are both fabricated on silica substrates, making it possible to integrate the two structures on a single plate. With significant savings of volume and mass, our scheme may have potential applications in future integrated optical devices.

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