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Hybrid Q-switched Yb-doped fiber laser

J. Y. Huang, W. Z. Zhuang, W. C. Huang, K. W. Su, K. F. Huang, Y. F. Chen
We investigate the performance of a hybrid Q-switched (HQS) fiber laser that is constructed with a low RF-power driven acousto-optic (AO) Q-switch and an AlGaInAs semiconductor saturable absorber. Compared to a pure passively Q-switched (PQS) fiber laser, the ratio of timing jitter to pulse period ... [Opt. Express 19, 9364-9370 (2011)]

Direct numerical simulation of quasi-three-level passive Q-switched laser

Publication year: 2011
Source: Optics Communications, In Press, Uncorrected Proof, Available online 8 April 2011
Qinan, Li , Baohua, Feng , Zhiguo, Zhang , Tao, Zhang
The Runge–Kutta method is used to solve numerically the rate equations of quasi-three-level passive Q-switched laser directly without any approximate treatment of these differential equations. The 946nm self-Q-switched Cr,Nd:YAG laser is chosen for example to describe the details. The time-dependence of intra-cavity photon density is obtained and its detailed real-time changing process is reproduced in numerical solution. The curves of laser output parameters such as average output power, pulse width, repetition rate, pulse energy and peak power changing with different cavity conditions such as pump power, output coupler reflectivity, Cr,Nd:YAG crystal length, Nd3+ ion and Cr4+ ion concentrations are simulated...

Photonic multiqubit states from a single atom

Author(s): Ying Li, Leandro Aolita, and L. C. Kwek
We propose a protocol for the creation of photonic Greenberger-Horne-Zeilinger and linear cluster states emitted from a single atom—or ion—coupled to an optical cavity field. The method is based on laser pulses with different polarizations and exploits the atomic transition amplitudes to state-s...
[Phys. Rev. A 83, 032313] Published Tue Mar 22, 2011

Model for reflection and transmission matrices of nanowire end facets

Guro K. Svendsen, Helge Weman, and Johannes Skaar
Nanowires show a large potential for various electro-optical devices, such as light emitting diodes, solar cells, and nanowire lasers. We present a method developed to calculate the modal reflection and transmission matrix at the end facets of a waveguide of arbitrary cross-section, resulting in a g ... [J. Appl. Phys. 109, 103101 (2011)] published Mon May 16, 2011.

Axial scanning laser Doppler velocimeter using wavelength change without moving mechanism in sensor probe

Koichi Maru
A scanning laser Doppler velocimeter (LDV) without any moving mechanism in its sensor probe is proposed. In the proposed scanning LDV, the measurement position is axially scanned by change in the wavelength of the light input to the sensor probe, instead of using a moving mechanism in the sensor ... [Opt. Express 19, 5960-5969 (2011)]

Laser plasma plume structure and dynamics in the ambient air: The early stage of expansion

M. Cirisan, J. M. Jouvard, L. Lavisse, L. Hallo, and R. Oltra
Laser ablation plasma plume expanding into the ambient atmosphere may be an efficient way to produce nanoparticles. From that reason it would be interesting to study the properties of these laser induced plasmas formed under conditions that are known to be favorable for nanoparticles production. In ... [J. Appl. Phys. 109, 103301 (2011)] published Mon May 16, 2011.

Controlling the XUV Transparency of Helium Using Two-Pathway Quantum Interference

Author(s): P. Ranitovic, X. M. Tong, C. W. Hogle, X. Zhou, Y. Liu, N. Toshima, M. M. Murnane, and H. C. Kapteyn
Atoms irradiated with combined femtosecond laser and extreme ultraviolet (XUV) fields ionize through multiphoton processes, even when the energy of the XUV photon is below the ionization potential. However, in the presence of two different XUV photons and an intense laser field, it is possible to in...
PRL Editors' Suggestion
[Phys. Rev. Lett. 106, 193008] Published Fri May 13, 2011


Femtosecond laser writing of multifunctional optical waveguides in a Nd:YVO_4+KTP hybrid system

Ningning Dong, Yang Tan, Antonio Benayas, J. Vázquez de Aldana, Daniel Jaque, Carolina Romero, Feng Chen, Qingming Lu
We report on the fabrication of optical channel waveguides supporting both visible and IR TE and TM confinement in a hybrid system composed of a Nd:YVO_4 laser gain medium glued to a potassium titanyl phosphate (KTP) nonlinear crystal. The microphotoluminescence and second harmonic confocal images ... [Opt. Lett. 36, 975-977 (2011)]

High-power pulsed diode-pumped Er:ZBLAN fiber laser

Martin Gorjan, Rok Petkovšek, Marko Marinček, Martin Čopič
We report on the operation and performance of a gain-switched Er:ZBLAN fiber laser based on an active pulsed diode pump system. The produced laser pulses offer high peak powers while retaining the high average powers and efficiency of the cw regime. The measured pulse duration was about 300?ns and ... [Opt. Lett. 36, 1923-1925 (2011)]

Optimization of displacement-measuring quadrature interferometers considering the real properties of optical components

Tomaž Požar, Peter Gregorčič, Janez Možina
We present the influence of alignment and the real properties of optical components on the performance of a two-detector homodyne displacement-measuring quadrature laser interferometer. An experimental method, based on the optimization of visibility and sensitivity, was established and ... [Appl. Opt. 50, 1210-1219 (2011)]

Real-time blind deconvolution of retinal images in adaptive optics scanning laser ophthalmoscopy

Publication year: 2011
Source: Optics Communications, In Press, Uncorrected Proof, Available online 6 April 2011
Hao, Li , Jing, Lu , Guohua, Shi , Yudong, Zhang
With the use of adaptive optics (AO), the ocular aberrations can be compensated to get high-resolution image of living human retina. However, the wavefront correction is not perfect due to the wavefront measure error and hardware restrictions. Thus, it is necessary to use a deconvolution algorithm to recover the retinal images. In this paper, a blind deconvolution technique called Incremental Wiener filter is used to restore the adaptive optics confocal scanning laser ophthalmoscope (AOSLO) images. The point-spread function (PSF) measured by wavefront sensor is only used as an initial value of our algorithm. We also realize the Incremental Wiener filter...

Linearly polarized fiber laser using a point-by-point Bragg grating in a single-polarization photonic bandgap fiber

Ryuichiro Goto, Robert J. Williams, Nemanja Jovanovic, Graham D. Marshall, Michael J. Withford, Stuart D. Jackson
We present a narrow-linewidth, linearly polarized neodymium-doped fiber laser that incorporates a point-by-point Bragg grating inscribed into the core of a single-polarization all-solid photonic bandgap fiber. The Bragg grating was written within a single-polarization wavelength band of the fiber; ... [Opt. Lett. 36, 1872-1874 (2011)]

Plasma filament investigation by transverse optical interferometry and terahertz scattering

Sergey Bodrov, Vladimir Bukin, Maxim Tsarev, Aleksey Murzanev, Sergey Garnov, Nickolay Aleksandrov, Andrey Stepanov
Transverse plasma distribution with 10^17 cm^−3 maximum electron density and 150 μm transverse size in a plasma filament formed in air by an intense femtosecond laser pulse was measured by means of optical interferometry. Two orders of magnitude decay of the electron density within 2 ... [Opt. Express 19, 6829-6835 (2011)]

Synthesis, growth and characterization of novel semiorganic nonlinear optical potassium boro-succinate (KBS) single crystals

Publication year: 2011
Source: Optics & Laser Technology, In Press, Corrected Proof, Available online 8 April 2011
V., Chithambaram , S., Jerome Das , R., Arivudai Nambi , S., Krishnan
Single crystals of novel semiorganic material, potassium boro-succinate (KBS) have been grown from aqueous solution by slow evaporation technique. The lattice parameters for the grown crystals were determined by the single crystal X-ray diffraction analysis. The presence of functional groups was estimated qualitatively by using fourier transform infrared (FTIR) analysis. The optical absorption spectrum shows that the UV cut-off wavelength for the grown crystal is at 240nm. The thermal stability of the KBS crystal was studied by using TG/DTA analysis. The dielectric constant and loss were studied as a function of frequency. Nonlinear optical properties (NLO) test was performed by...

Room temperature ferromagnetism in N-doped rutile TiO films

N. N. Bao, H. M. Fan, J. Ding, and J. B. Yi
Room temperature ferromagnetism has been experimentally observed in TiO:N films prepared by pulse laser deposition under NO atmosphere. The ferromagnetism appears when the NO partial pressure is higher than 10 Torr. XPS study has revealed that N substitutes O at the partial pressure of 10 Torr, wher ... [J. Appl. Phys. 109, 07C302 (2011)] published Thu Mar 17, 2011.

Is it possible to check microcomponent coatings?

Hervé Piombini, Philippe Voarino, Fabien Lemarchand
Optical microcomponents are increasingly used in laser optical systems because of their many and novel industrial applications. These components are coated in order to enhance their optical performance, but optical characterizations are very difficult due to the shapes and small size. Thus, to ... [Appl. Opt. 50, C424-C432 (2011)]

Growth and characterization of GSZS crystals with enhanced transparency window for non linear optical applications

Publication year: 2011
Source: Optics Communications, In Press, Uncorrected Proof, Available online 6 April 2011
M.M., Khandpekar , S.S., Dongare , S.B., Patil , S.P., Pati
Transparent crystals of novel non-linear optical material comprising of glycine sodium–zinc sulfate (GSZS) have been grown in our laboratory from solution by slow evaporation technique. Transparent crystals of dimensions (8×7×4mm3) have been obtained in 3–4weeks time. The solubility in water shows linear variation in temperatures range from 300K to 350K. The GSZS crystal exhibits orthorhombic symmetry with a=5.418 A.U., b=6.084 A.U and c=3.497 A.U. The intense XRD peak is found at 25.43°. The presence of functional groups has been studied by FTIR analysis and verified by laser Raman spectra. Lower cutoff wavelength and enhanced transparency window with a typical energy...

Characterization of high-intensity sub-4-fs laser pulses using spatially encoded spectral shearing interferometry

Tobias Witting, Felix Frank, Christopher A. Arrell, William A. Okell, Jonathan P. Marangos, John W. G. Tisch
We report on the full amplitude and phase characterization of high-intensity few-cycle laser pulses generated in a single-stage hollow core fiber system with subsequent compression by ultrabroadband chirped mirrors. We use a spatially-encoded arrangement (SEA) spectral phase interferometry for ... [Opt. Lett. 36, 1680-1682 (2011)]

Stable mode-locked fiber laser using 49 cm long bismuth oxide based erbium doped fiber and slow saturable absorber

Abstract  
A stable mode-locked fiber laser employing a 49 cm long bismuth oxide based erbium doped fiber (Bi-EDF) by using a slow saturable
absorber is demonstrated. Near transform limited short pulses with a repetition rate of 8.27 MHz are obtained at a wavelength
of 1560 nm with a maximum spectral width of 15 nm. Results indicate that pulse characteristics are strongly dependent on pump
power rather than spectral width. Moreover the Time-Bandwidth products (TBWP), pulse duration, the energy fluctuation and
timing jitter decrease with increasing pump power. The pulse width is continuously varied from 1.2 ps to less than 300 fs.
It produces stable mode locking with a maximum spectral width of 15 nm, minimum timing jitter of 4 ps and energy fluctuations
of 2.5%. The pulse train was amplified using a two-stage amplifier up to 447 mW average power corresponding to peak powers
of 177.3 kW.

Multi-gigahertz repetition rate passively modelocked fiber lasers using carbon nanotubes

Amos Martinez, Shinji Yamashita
There is an increasing demand for all-fiber passively mode-locked lasers with pulse repetition rates in the order of gigahertz for their potential applications in fields such as telecommunications and metrology. However, conventional mode-locked fiber lasers typically operate at fundamental ... [Opt. Express 19, 6155-6163 (2011)]

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