Laserati

Dongxia Qu, Richard Cendejas, Zhijun Liu, Claire Gmachl, and Fred Towner
We study the mode spectra and lasing thresholds of spiral-shaped quantum cascade lasers with a deformation in the range of 10%45% with respect to the radius and with various notch angles. We observe that the initial lasing wavelength and the threshold of a laser are correlated with each other, and t ... [Appl. Phys. Lett. 93, 261116 (2008)] published Wed Dec 31, 2008.

Dmitry Khokhlov, Ludmila Ryabova, Andrey Nicorici, Valery Shklover, Sergey Ganichev et al.
We have analyzed photoconductivity in PbSnTe(In) under the action of ~100 ns long terahertz laser pulses with the wavelength varying from 90 to 280 [mu]m in the temperature range 4.2300 K. Strong photoresponse has been observed at all laser wavelengths used. Two types of photoresponse have been det ... [Appl. Phys. Lett. 93, 264103 (2008)] published Wed Dec 31, 2008.

Soma S. V. Kandula, Phuong Tran, Philippe H. Geubelle, and Nancy R. Sottos
We investigate laser-induced dynamic delamination of a patterned thin film on a substrate. Controlled delamination results from our insertion of a weak adhesion region beneath the film. The inertial forces acting on the weakly bonded portion of the film lead to stable propagation of a crack along th ... [Appl. Phys. Lett. 93, 261902 (2008)] published Mon Dec 29, 2008.

Takashi Fujikura, Osamu Matsuda, Dieter M. Profunser, Oliver B. Wright, Jeremy Masson et al.
Time resolved images of acoustic waves in the 100 MHz2.2 GHz range are obtained for an electrically excited thin-film bulk acoustic wave resonator by means of an ultrafast optical technique. Electrical pulses, synchronized to ultrashort laser pulses, piezoelectrically excite the device, and synchron ... [Appl. Phys. Lett. 93, 261101 (2008)] published Mon Dec 29, 2008.

D. Nguyen, L. A. Emmert, I. V. Cravetchi, M. Mero, W. Rudolph et al.
Ion-beam sputtered TiSiO binary-oxide films of high optical quality with tunable bandgap and refractive index were produced using zone targets. The suitability of the films for high-power subpicosecond laser applications is explored by laser breakdown measurements. The observed scaling laws of the s ... [Appl. Phys. Lett. 93, 261903 (2008)] published Mon Dec 29, 2008.

L. C. Zhang, A. L. Vasiliev, I. B. Misirlioglu, R. Ramesh, S. P. Alpay et al.
Electron diffraction and atom location by channeling enhanced microanalysis were used to show that epitaxial PbZrTiO films grown on (001) SrTiO substrates by pulsed laser deposition exhibit long-range order on the tetravalent cation sublattice parallel to the film/substrate interface. This ordering ... [Appl. Phys. Lett. 93, 262903 (2008)] published Mon Dec 29, 2008.

J. A. Chakera, A. Ali, Y. Y. Tsui, and R. Fedosejevs
We report a continuously operated Cu Kalpha x-ray source produced by a commercial kilohertz submillijoule femtosecond laser system. The source has an x-ray conversion of ~4 x 10 into Kalpha line emission at 8.05 keV. The microplasma x-ray source has a size of 8 [mu]m (full width at half maximum) pr ... [Appl. Phys. Lett. 93, 261501 (2008)] published Mon Dec 29, 2008.

Gabor Matthaus, Bulend Ortac, Jens Limpert, Stefan Nolte, Rico Hohmuth et al.
Intracavity terahertz emission inside a high-energy ultrafast Yb-doped fiber laser is presented. The terahertz radiation is generated by a transient photocurrent induced at the surface of a saturable InGaAs multiquantum well grown by molecular beam epitaxy on top of a semiconductor Bragg reflector. ... [Appl. Phys. Lett. 93, 261105 (2008)] published Mon Dec 29, 2008.

Alexander Sell, Rudiger Scheu, Alfred Leitenstorfer, and Rupert Huber
We demonstrate phase-stable generation and ultrabroadband electro-optic detection of few-cycle multi-terahertz transients tunable from 55 to 107 THz based on a versatile telecom compatible three-branch Er:fiber laser system. Difference frequency mixing of two laser pulse trains at the full repetitio ... [Appl. Phys. Lett. 93, 251107 (2008)] published Wed Dec 24, 2008.

Q. Yang, R. Losch, W. Bronner, S. Hugger, F. Fuchs et al.
Employing a slightly diagonal active region design for the quantum cascade lasers compared to a reference sample based on the conventional vertical transition design [R. Kohler et al., Appl. Phys. Lett. 76, 1092 (2000)], we have improved the maximum operation temperature, room-temperature maximum pe ... [Appl. Phys. Lett. 93, 251110 (2008)] published Wed Dec 24, 2008.