Virtual Journal of Laser is a web tool to help laser researchers follow new publications from major academic journals, discover and promote interesting works by voting, commenting and simply visiting. Subscribe Virtual Journal of Laser to take the advantage! Read more...
If you find VJLaser helpful, please consider donation for covering the host costage. Many thanks!
Toru Segawa, Wataru Kobayashi, Tomonari Sato, Shinji Matsuo, Ryuzo Iga, Ryo Takahashi
We present a novel parallel-ring-resonator tunable laser monolithically integrated with an InGaAlAs electroabsorption modulator. The fabricated tunable laser exhibits stable wavelength tuning with a step of 200 GHz over a wide tuning range of 35 nm, achieved with a single electrode control. The ... [Opt. Express 20, B485-B492 (2012)]
We present design and analysis of metallic-semiconductor nanoring laser lasing at around 1450 nm wavelength, utilizing a body-of-revolution finite-difference-time-domain (BOR-FDTD) simulation incorporated with a semiclassical multilevel model for semiconductor gain medium and the Drude–Lorentz model for metal, which is developed for efficient simulation of disk/ring plasmonic laser. As compared to other literature, our nanoring laser works in radial mode with resonance cycle,
Publication year: 2013
Source:Optics & Laser Technology, Volume 49
Author(s): N. I. Shvetsov-Shilovski, D. Dimitrovski, and L. B. Madsen
By comparison with the solution of the time-dependent Schrödinger equation we explore the validity of the two-step semiclassical model for strong-field ionization in elliptically polarized laser pulses. We find that the discrepancy between the two-step model and the quantum theory correlates with si...
[Phys. Rev. A 87, 013427] Published Thu Jan 24, 2013
We demonstrate all-optical wavelength conversion of four channels of polarization scrambled 10 Gb/s dense wavelength division multiplexed signals consisting of both nonreturn-to-zero-ON-OFF-keyed and differential-phase-shift keyed signals using 20 m of nonlinear birefringent photonic crystal fiber (PCF). Power penalties <;0.5 dB were achieved for a conversion bandwidth of 22 nm with four-wave mixing efficiencies between -20 and -24 dB. A rack-mount wavelength converter prototype is presented that consists of a highly tunable sample grating distributed Bragg reflector pump laser, a high-power erbium-doped fiber amplifier, a tunable bandpass filter, and a polarization controller that are all controlled using a microcontroller. Automatic polarization control of the high-power pump is demonstrated for the first time using the polarization dependence of stimulated Brillouin scattering in the PCF as a feedback mechanism.
Publication year: 2011
Source: Optics Communications, In Press, Uncorrected Proof, Available online 11 February 2011
T., Saiki , M., Nakatsuka , K., Fujioka , S., Motokoshi , K., Imasaki
Spectral broadening of the fluorescence of a Nd/Cr:YAG ceramic at the 1064nm lasing wavelength was observed, and the amplification properties at a high temperature were investigated by considering cross-relaxation. These ceramics are promising for use as a solid-laser material pumped with solar or lamp light. It has been found that whenever the temperature of a laser medium is high and a spectral shift occurs, a high small-signal gain remains owing to the broad spectral band and the cross-relaxation. This optical property is remarkably different from that of a Nd:YAG laser. For a conventional Nd:YAG laser, the bandwidth at 1064nm is...
Publication year: 2011
Source: Optics Communications, In Press, Uncorrected Proof, Available online 3 February 2011
Yufei, Ma , Yue, Zhang , Xin, Yu , Xudong, Li , Fei, Chen , ...
In this letter, a doubly Q-switched 1.06μm pulse laser with AO modulator and Cr4+:YAG saturable absorber by direct pumping grown-together composite GdVO4/Nd:GdVO4 crystal is demonstrated for the first time. Compared to purely AO Q-switching, the simultaneous use of AO Q-switch and Cr4+:YAG saturable absorber can generate shorter pulses and more symmetric temporal profiles. The thermal lens effect of laser crystal was analyzed.
Research highlights: ►Doubly Q-switched laser by direct 879nm pumping GdVO4/Nd:GdVO4 crystal. ►The characteristics of doubly Q-switched pulse laser were investigated. ►The thermal lens effect of different laser crystals was measured.
Source:Optics & Laser Technology, Volume 53
Author(s): Dalong Cong , Hong Zhou , Miaoqiang Yang , Zhihui Zhang , Peng Zhang , Chao Meng , Chuanwei Wang
Lai Liu, Guanshi Qin, Qijun Tian, Dan Zhao, Weiping Qin
We numerically investigate mid-infrared supercontinuum generation in single mode fluoride fiber pumped by 1.56 μm picosecond fiber lasers. To get high energy conversion efficiency in mid-infrared region, the ratio of power generated in 2.5 ~5 μm range to the total input power for ... [Opt. Express 19, 10041-10048 (2011)]
V. V. Vitkin, I. G. Kuchma, V. P. Pokrovskiĭ, D. I. Lychagin, V. M. Polyakov
This article presents a choice of components for creating an effective pumping system for a YAG:Nd laser with a single-pulse energy of 60 mJ. An original design is proposed for the amplifier’s pump system. The efficiency of three types of illuminator for the amplifier are experimentally ... [J. Opt. Technol. 79, 632-635 (2012)]
B. Canuel, E. Genin, G. Vajente, J. Marque
The second generation of ground-based interferometric gravitational wave detectors are currently being built and installed. They are designed to be better in strain sensitivity by about a factor 10 with respect to the first generation. Light originating from the laser and following unintended ... [Opt. Express 21, 10546-10562 (2013)]
Publication year: 2011
Source: Optics Communications, In Press, Uncorrected Proof, Available online 16 February 2011
Lingling, Qiao , Fei, He , Chen, Wang , Yang, Liao , Ya, Cheng , ...
We report, for the first time to our knowledge, on the application of a micro-optical lens fabricated by three-dimensional (3D) femtosecond laser direct writing for two-photon fluorescence imaging of biological tissues. We show that the two-photon fluorescence images of a plant leaf tissue acquired with the micro-optical lens are comparable to that of a 5× objective lens. Our result represents an important step towards the application of micro-optical components fabricated by femtosecond laser micromachining in miniaturized nonlinear fluorescence microscopy applications, such as two-photon endoscopy.
Research highlights: ► We fabricate high-quality microlens using 3D femtosecond laser micromachining. ► The microlens has a low surface roughness and a resolution comparable to that of a 5× objective lens. ► We perform two-photon imaging of bio-tissues with the laser-fabricated microlens.
Yutang Dai, Minghong Yang, Gang Xu, Yinquan Yuan
A novel magnetic field sensor based on Terfenol-D coated fiber Bragg grating with spiral microstructure was proposed and demonstrated. Through a specially-designed holder, the spiral microstructure was ablated into the fiber Bragg grating (FBG) cladding by femtosecond laser. Due to the spiral ... [Opt. Express 21, 17386-17391 (2013)]
Source:Optics & Laser Technology, Volume 58
Author(s): Xuping Wang , Bing Liu , Yuguo Yang
Author(s): G. Ranjit and C. I. Sukenik
We report on our investigation of the formation and survival of long-lived Rydberg states in argon produced by pulsed laser excitation of ultracold metastable state argon atoms in a magneto-optical trap. The states studied have a 2P1/2 core. Low angular momentum Rydberg states with this core normall...
[Phys. Rev. A 87, 033418] Published Mon Mar 25, 2013
Publication year: 2011
Source: Optics Communications, In Press, Uncorrected Proof, Available online 15 February 2011
Zhengqian, Luo , Wen-De, Zhong , Chenchun, Ye , Huiying, Xu , Zhiping, Cai
We demonstrate a continuously wavelength-spacing-tunable and high-power multiwavelength fiber optical parametric oscillator based on the multiwavelength idler-output technique. The laser cavity for multiwavelength idler outputs is constructed by a pumped highly-nonlinear dispersion-shifted fiber as parametric gain medium, two highly-reflective chirped fiber Bragg gratings (CFBGs) and a superimposed CFBG as comb-like filter. At a pump power of 1.1W, the idler output of 10 wavelengths around 1.56μm is achieved with a wavelength spacing of 0.39nm. The wavelength spacing can be continuously tuned from 0.39 to 1.0nm by utilizing a cantilever beam-based chirp tuning method to change the FSR of the superimposed CFBG....
Gang Chen, Rainer Martini, Seong-wook Park, Clyde G. Bethea, I.-Chun A. Chen et al.
An optically induced fast wavelength shift is demonstrated in a standard middle infrared (MIR) quantum cascade laser (QCL) by illuminating the front facet with a femtosecond (fs) near infrared (NIR) laser, allowing fast optical frequency modulation (FM) for free space optical communication (FSOC) an ... [Appl. Phys. Lett. 97, 011102 (2010)] published Wed Jul 7, 2010.
Publication year: 2012
Yong Gang Wang, Hou Ren Chen, Wen Feng Hsieh, Yuen H. Tsang
Author(s): T. Ceccotti et al.
The interaction of laser pulses with thin grating targets, having a periodic groove at the irradiated surface, is experimentally investigated. Ultrahigh contrast (∼1012) pulses allow us to demonstrate an enhanced laser-target coupling for the first time in the relativistic regime of ultrahigh intens...
[Phys. Rev. Lett. 111, 185001] Published Mon Oct 28, 2013