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2 Apr 2001

Volume 78, Issue 14, pp. 1961-2084

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Diffuse multiself-frequency conversion processes in the blue and green by quasicylindrical ferroelectric domains in Nd3+:Sr0.6Ba0.4(NbO3)2 laser crystal

J. J. Romero, D. Jaque, J. García Solé, and A. A. Kaminskii

Appl. Phys. Lett. 78, 1961 (2001); http://dx.doi.org/10.1063/1.1355993 (3 pages) | Cited 52 times

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In this letter we demonstrate continuous-wave blue and green diffuse laser light generation from a Nd3+-doped Sr0.6Ba0.4(NbO3)2 crystal located in an end-pumped laser cavity and operating at the 4F3/2→4I11/2 laser channel. The diffuse nature of the visible radiation is attributed to numerous ferroelectric cylindrical domains, which appear in the as-grown crystal. Green radiation is obtained by self-frequency doubling of the infrared radiation, whereas tunable blue radiation is generated by self-frequency sum mixing of infrared and pump radiations. The variety of visible colors is due to the spread in the domain sizes. Finally, we report on the spectral and spatial distribution of this visible radiation. © 2001 American Institute of Physics.
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42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
42.60.Fc Modulation, tuning, and mode locking
42.55.Rz Doped-insulator lasers and other solid state lasers
42.70.Hj Laser materials
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.80.Dj Domain structure; hysteresis

Continuous wave operation of a 9.3 μm quantum cascade laser on a Peltier cooler

Daniel Hofstetter, Mattias Beck, Thierry Aellen, Jérôme Faist, Ursula Oesterle, Marc Ilegems, Emilio Gini, and Hans Melchior

Appl. Phys. Lett. 78, 1964 (2001); http://dx.doi.org/10.1063/1.1360225 (3 pages) | Cited 58 times

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High average power quantum cascade lasers at 9.3 μm using InP top cladding layers and both junction up and junction down mounting are presented. A 3 mm long, junction up mounted device emitted 54 mW average power at 30 °C and 11.5% duty cycle with a threshold current density of 3.72 kA/cm2. A similar, but only 1.5 mm long device with high reflection coating on both facets was mounted junction down and tested at even higher duty cycles. At −27 °C, we achieved continuous wave operation with a threshold current density of 3.3 kA/cm2. © 2001 American Institute of Physics.
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42.60.By Design of specific laser systems
42.55.Px Semiconductor lasers; laser diodes
85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)

Measurement of far-infrared waveguide loss using a multisection single-pass technique

Michel Rochat, Mattias Beck, Jérôme Faist, and Ursula Oesterle

Appl. Phys. Lett. 78, 1967 (2001); http://dx.doi.org/10.1063/1.1357444 (3 pages) | Cited 19 times

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Waveguide loss measurements based on a multisection single-pass technique have been performed for both mid-infrared and far-infrared quantum cascade structures. The far-infrared quantum cascade structures are based on a vertical transition active region emitting at λ ≈ 76 μm, embedded in a double-plasmon waveguide. The measured waveguide loss of 42±20 cm−1 agrees well with the calculated one based on free carrier absorption. © 2001 American Institute of Physics.
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42.55.Px Semiconductor lasers; laser diodes
42.79.Gn Optical waveguides and couplers
85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)

Green-induced infrared absorption in MgO doped LiNbO3

Y. Furukawa, K. Kitamura, A. Alexandrovski, R. K. Route, M. M. Fejer, and G. Foulon

Appl. Phys. Lett. 78, 1970 (2001); http://dx.doi.org/10.1063/1.1359137 (3 pages) | Cited 71 times

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Green-induced infrared absorption (GRIIRA) was investigated by a photothermal technique for undoped and Mg-doped LiNbO3 crystals that have different Li/Nb ratios. Threshold effect on GRIIRA was found, threshold MgO concentrations being the same for GRIIRA and photorefraction. We suggest that GRIIRA is associated with the formation of the small polaron that is located on Nb antisite defect. The remarkable decrease of GRIIRA in Mg:LiNbO3 can then be attributed to the elimination of this intrinsic defect, Nb in Li, following the incorporation of Mg on Li sites. For nonlinear optical applications, LiNbO3 doped with MgO at concentrations over threshold has a combined advantage of having almost no GRIIRA and photorefraction. © 2001 American Institute of Physics.
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42.70.Mp Nonlinear optical crystals
78.30.Hv Other nonmetallic inorganics
78.20.N- Thermo-optic effects
78.20.nb Photothermal effects
61.72.J- Point defects and defect clusters
71.38.-k Polarons and electron-phonon interactions
71.55.Ht Other nonmetals

Magnetic field induced luminescence spectra in a quantum cascade laser

V. M. Apalkov and Tapash Chakraborty

Appl. Phys. Lett. 78, 1973 (2001); http://dx.doi.org/10.1063/1.1359488 (3 pages) | Cited 2 times

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We report on our study of the luminescence spectra of a quantum cascade laser in the presence of an external magnetic field tilted from the direction perpendicular to the electron plane. The effect of the tilted field is to allow novel optical transitions because of the coupling of intersubband-cyclotron energies. We find that by tuning the applied field, one can get optical transitions at different energies that are as sharp as the zero-field transitions. © 2001 American Institute of Physics.
Show PACS
42.55.Px Semiconductor lasers; laser diodes
78.67.De Quantum wells
78.20.Ls Magneto-optical effects
73.21.Fg Quantum wells
85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)
78.60.Fi Electroluminescence
71.70.Di Landau levels
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