Virtual Journal of Laser

Yuan Bao, Zhaohui Li, Jianping Li, Xinhuan Feng, Bai-ou Guan, Guifang Li
Optical orthogonal frequency-division multiplexing (OOFDM) signal is sensitive to nonlinear distortions induced by optical modulators. We propose and experimentally demonstrate a digital pre-distortion (DPD) algorithm to linearize the optical modulators including electro-absorption modulated lasers ... [Opt. Express 21, 7354-7361 (2013)]

Shaoqiang Chen, Masahiro Yoshita, Takashi Ito, Toshimitsu Mochizuki, Hidefumi Akiyama, Hiroyuki Yokoyama
Gain-switched pulses of InGaAs double-quantum-well lasers fabricated from identical epitaxial laser wafers were measured under both current injection and optical pumping conditions. The shortest output pulse widths were nearly identical (about 40 ps) both for current injection and optical pumping; ... [Opt. Express 21, 7570-7576 (2013)]

Y. P. Huang, Y. J. Huang, C. Y. Cho, Y. F. Chen
A singly-resonant intracavity optical parametric oscillator (OPO), pumped by a passively Q-switched Nd:YAG laser, is systematically investigated by means of a series of the output mirrors with various reflectivities for the fundamental wavelength at 1064 nm. Experimental results reveal that the ... [Opt. Express 21, 7583-7589 (2013)]

C. Sánchez, B. Ortega, J. L. Wei, J. Tang, J. Capmany
We provide an analytical study on the propagation effects of a directly modulated OOFDM signal through a dispersive fiber and subsequent photo-detection. The analysis includes the effects of the laser operation point and the interplay between chromatic dispersion and laser chirp. The final ... [Opt. Express 21, 7651-7666 (2013)]

S. Rydberg, M. Engholm
In this work we present experimental evidence that the valence instability of the ytterbium ion play a key role for the observed photodarkening mechanism in Yb-doped fiber lasers. Luminescence and excitation spectroscopy performed on UV irradiated Yb/Al doped silica glass preforms and near-infrared ... [Opt. Express 21, 6681-6688 (2013)]

Jianzhong Zhang, Zinat M. Sathi, Yanhua Luo, John Canning, Gang-Ding Peng
We demonstrate a broadband optical emission from Bi/Er co-doped fiber and a single 830nm laser diode pump. The ultra-broadband mechanism is studied and discussed in details based on a combination of experimental measurements, including luminescence, differential luminescence and ESA, on fiber ... [Opt. Express 21, 7786-7792 (2013)]

Ekaterina A. Zlobina, Sergey I. Kablukov, Sergey A. Babin
CW all-fiber optical parametric oscillator (FOPO) with tuning range from 950 to 1010 nm is demonstrated using birefringent photonic crystal fiber pumped by an Ytterbium-doped fiber laser (YDFL) near 1 μm. CW parametric generation with spectral linewidth of 3.7 nm at 972 nm has been obtained ... [Opt. Express 21, 6777-6782 (2013)]

Albertas Žukauskas, Mangirdas Malinauskas, Arūnas Kadys, Gediminas Gervinskas, Gediminas Seniutinas, Sasikaran Kandasamy, Saulius Juodkazis
We demonstrate that black silicon (b-Si) made by dry plasma etching is a promising substrate for laser three-dimensional (3D) micro/nano-polymerization. High aspect ratio Si-needles, working as sacrificial support structures, have flexibility required to relax interface stresses between substrate ... [Opt. Express 21, 6901-6909 (2013)]

Miftar Ganija, David Ottaway, Peter Veitch, Jesper Munch
A cryogenic slab laser that is suitable for scaling to high power, while taking full advantage of the improved thermo-optical and thermo-mechanical properties of Yb:YAG at cryogenic temperatures is described. The laser uses a conduction cooled, end pumped, zigzag slab geometry resulting in a near ... [Opt. Express 21, 6973-6978 (2013)]

Iestyn Pope, Wolfgang Langbein, Peter Watson, Paola Borri
We have developed a multimodal multiphoton laser-scanning microscope for cell imaging featuring simultaneous acquisition of differential Coherent Antistokes Raman Scattering (D-CARS), two-photon fluorescence (TPF) and second harmonic generation (SHG) using a single 5 fs Ti:Sa broadband ... [Opt. Express 21, 7096-7106 (2013)]