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10 Feb 2003

Volume 82, Issue 6, pp. 841-996

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Appl. Phys. Lett. 82, 913 (2003); http://dx.doi.org/10.1063/1.1542686 (3 pages)

F. Gao and W. J. Weber
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Alternative-precursor metalorganic chemical vapor deposition of self-organized InGaAs/GaAs quantum dots and quantum-dot lasers

R. L. Sellin, I. Kaiander, D. Ouyang, T. Kettler, U. W. Pohl, D. Bimberg, N. D. Zakharov, and P. Werner

Appl. Phys. Lett. 82, 841 (2003); http://dx.doi.org/10.1063/1.1544641 (3 pages) | Cited 15 times

Online Publication Date: 4 February 2003

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Metalorganic chemical vapor deposition of laser diodes based on triple stacks of self-organized InxGa1−xAs/GaAs quantum dots (QDs) as active medium using the alternative precursor tertiarybutylarsine (TBAs) is reported. Epitaxy of monodispersed QDs using TBAs is demonstrated. Due to the high cracking efficiency of TBAs at low temperatures, the crucial growth parameters V/III ratio and temperature can be tuned almost independently. Ridge-waveguide QD lasers show a transparency current of 29.7 A/cm2—equivalent to 9.9 A/cm2 per QD layer—an internal quantum efficiency of 91.4%, and an internal optical loss of 2.2 cm−1. © 2003 American Institute of Physics.
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81.07.Ta Quantum dots
42.55.Px Semiconductor lasers; laser diodes
81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)
85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
81.16.Dn Self-assembly

Laser operation with near quantum-defect slope efficiency in Nd:YVO4 under direct pumping into the emitting level

Y. Sato, T. Taira, N. Pavel, and V. Lupei

Appl. Phys. Lett. 82, 844 (2003); http://dx.doi.org/10.1063/1.1544659 (3 pages) | Cited 62 times

Online Publication Date: 4 February 2003

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One-micron continuous-wave (cw) laser emission with 0.80 slope efficiency (0.79 optical-to-optical efficiency) under Ti: sapphire and 0.75 slope efficiency relative to absorbed power under diode-laser pumping at 880 nm into the emitting level is demonstrated in a 1-mm-thick, 1.0-at. % Nd:YVO4 crystal. These values are superior to those obtained with 809-nm pumping into the level 4F5/2, and can be explained consistently by the effect of the quantum defect between the pump and laser radiation, the superposition of pump and laser mode volumes, the pump-level efficiency and the residual optical losses. In the analysis of the 809-nm pumping data a pump-level efficiency equal to the unity was employed, as determined with a method based on the pump-saturation effects on absorption. © 2003 American Institute of Physics.
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42.55.Rz Doped-insulator lasers and other solid state lasers
42.70.Hj Laser materials
42.60.Da Resonators, cavities, amplifiers, arrays, and rings

Piezoacoustic modulation of gain and distributed feedback for quantum cascade lasers with widely tunable emission wavelength

Mikhail V. Kisin and Serge Luryi

Appl. Phys. Lett. 82, 847 (2003); http://dx.doi.org/10.1063/1.1543232 (3 pages) | Cited 2 times

Online Publication Date: 4 February 2003

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Due to the piezoelectric properties of III–V materials, an acoustic wave propagating along the optical axis of a unipolar laser produces a periodic modulation of the carrier density and the optical gain, sufficient for providing distributed feedback (DFB) with a mode suppression ratio exceeding 30 dB. In contrast to bipolar lasers, the piezoelectric modulation of unipolar carrier density is not accompanied by a degradation of the average gain. Inasmuch as the acoustic frequency can be easily changed, the wavelength of the main DFB mode can be tuned in a wide range. This property should be very attractive for spectroscopic applications of the quantum cascade laser. © 2003 American Institute of Physics.
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42.55.Px Semiconductor lasers; laser diodes
42.60.Fc Modulation, tuning, and mode locking

Reverse saturable absorption of platinum ter/bipyridyl polyphenylacetylide complexes

Wenfang Sun, Zi-Xin Wu, Qing-Zheng Yang, Li-Zhu Wu, and Chen-Ho Tung

Appl. Phys. Lett. 82, 850 (2003); http://dx.doi.org/10.1063/1.1544438 (3 pages) | Cited 19 times

Online Publication Date: 4 February 2003

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Transition metal poly-ynes are very interesting nonlinear optical materials for optical limiting applications because of their low linear absorption at low intensities, but high nonlinear absorption at high intensities in the entire visible spectral range. The reverse saturable absorption (RSA) of seven platinum ter/bipyridyl polyphenylacetylide complexes has been investigated at 532 nm with nanosecond pulses. In an f/214 geometry, with sample linear transmission of 90% in a 2 mm cell, the reverse saturable absorption thresholds for these complexes are 8–30 mJ/cm2. The maximum output fluence of these complexes are limited to 0.45–1.16 J/cm2 for incident fluence as high as 3.6 J/cm2. The RSA is strongly influenced by the nature of the triaryl coordination ligand and the conjugation length of the polyphenylacetylide ligand in these complexes. This RSA is mainly attributed to the triplet excited state absorption, with a ratio of effective excited state to ground state absorption cross sections as high as ∼ 20. These results suggest that platinum ter/bipyridyl polyphenylacetylide complexes could be promising candidates for nanosecond optical limiting applications; and it is possible to improve the reverse saturable absorption by appropriate structural modifications. © 2003 American Institute of Physics.
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42.50.Gy Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption
42.50.Md Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency
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