Virtual Journal of Laser

Purnawirman, J. Sun, T. N. Adam, G. Leake, D. Coolbaugh, J. D. B. Bradley, E. Shah Hosseini, M. R. Watts
We report on integrated erbium-doped waveguide lasers designed for silicon photonic
systems. The distributed Bragg reflector laser cavities consist of silicon nitride waveguide and
grating features defined by wafer-scale immersion lithography and a top erbium-doped aluminum oxide
layer deposited ... [Opt. Lett. 38, 1760-1762 (2013)]

Yanguang Yu, Jiangtao Xi
This Letter presents the results revealing the influence of external optical feedback (EOF) on the alpha factor, or the linewidth enhancement factor, of semiconductor lasers operating on single mode. First, a method is proposed for the measurement of the alpha over a wide range of optical feedback ... [Opt. Lett. 38, 1781-1783 (2013)]

Karen X. Z. Yu, Logan G. Wright, Paul J. L. Webster, James. M. Fraser
We achieve high aspect-ratio laser ablation of silicon with a strong nonlinear dependence on pulse duration while using a power density 10^6 times less than the threshold for typical multiphoton-mediated ablation. This is especially counter-intuitive as silicon is nominally transparent to the ... [Opt. Lett. 38, 1799-1801 (2013)]

David Pabœuf, Peter J. Schlosser, Jennifer E. Hastie
We report a tunable, narrow-linewidth UV laser based on intracavity second-harmonic generation in a red semiconductor disk laser. Single-frequency operation is demonstrated with a total UV output power of 26 mW. By servo-locking the fundamental frequency to a reference Fabry–Pérot ... [Opt. Lett. 38, 1736-1738 (2013)]

Samuele Davide Di Dio Cafiso, Elena Ugolotti, Andreas Schmidt, Valentin Petrov, Uwe Griebner, Antonio Agnesi, Won Bae Cho, Bo Hee Jung, Fabian Rotermund, Sukang Bae, Byung Hee Hong, Giancarlo Reali, Federico Pirzio
We report on mode-locking of a Cr:YAG laser at 1516 nm using a monolayer graphene-based saturable absorber of transmission type generating 91 fs pulses with a Fourier product of 0.38 at an average output power exceeding 100 mW. Stable single-pulse mode-locked operation without any ... [Opt. Lett. 38, 1745-1747 (2013)]

Ryo Yasuhara, Hiroaki Furuse
The thermal-birefringence-induced depolarization in terbium gallium garnet (TGG) ceramics has been investigated experimentally. The depolarization ratio of 6.1×10^−4 has been observed at the maximum input power of 117 W cw, which corresponds to a normalized laser power of p=0.14. ... [Opt. Lett. 38, 1751-1753 (2013)]

A. M. Heidt, Z. Li, J. Sahu, P. C. Shardlow, M. Becker, M. Rothhardt, M. Ibsen, R. Phelan, B. Kelly, S. U. Alam, D. J. Richardson
We report on the generation of picosecond pulses at 2 μm directly from a gain-switched discrete-mode diode laser and their amplification in a multistage thulium-doped fiber amplifier chain. The system is capable of operating at repetition rates in the range of ... [Opt. Lett. 38, 1615-1617 (2013)]

Jacek Swiderski, Maria Michalska
We report on a generation of self-starting mode-locked resembling (MLR) pulses in an all-fiber, gain-switched Tm^3+-doped fiber laser operating at 2 μm wavelength, which we believe to be the first demonstration of such an approach. The laser delivers 100% modulated MLR pulses within an ... [Opt. Lett. 38, 1624-1626 (2013)]

Yu Yang, Zhifu Liao, Yuan Zhou, Yuanjing Cui, Guodong Qian
Herein, a highly sensitive stress probe is reported based on pyrromethene 597 (PM597) doped elastic polydimethylsiloxane films. By sandwiching the dye doped elastic film with two plano dichromatic mirrors, a solid-sate microcavity laser with low laser threshold (∼0.2  μJ) ... [Opt. Lett. 38, 1627-1629 (2013)]

Daniel T. Cassidy, O. Rehioui, Chadwick K. Hall, L. Béchou, Y. Deshayes, A. Kohl, T. Fillardet, Y. Ousten
The emitters at the edges of high-power laser bars tend to produce less power than emitters that are near the center of the bar. We suggest that shear strain, which owes to strain induced by bonding, creates through a photoelastic effect a weak birefringence that rotates the plane of polarization ... [Opt. Lett. 38, 1633-1635 (2013)]