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19 Jul 1999

Volume 75, Issue 3, pp. 307-435

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Optically encoded second-harmonic generation in germanosilicate glass via a band-to-band excitation

Jinhai Si, Kenji Kitaoka, Tsuneo Mitsuyu, and Kazuyuki Hirao

Appl. Phys. Lett. 75, 307 (1999); http://dx.doi.org/10.1063/1.124358 (3 pages)

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Optically encoded second-harmonic generation was enhanced by irradiating the germanosilicate glass with a pump beam of wavelength of 355 nm along with preparation beams at frequencies ω and 2ω. The origin of this enhancement was investigated by measuring the absorption spectra before and after preparation. The results suggest that the enhancement effect is related to the creation of an electron trapped center (GEC: germanium electron center) via a band-to-band excitation. © 1999 American Institute of Physics.
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61.43.Fs Glasses
42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
71.55.Ht Other nonmetals

GaAs/AlGaAs multiple-quantum-well in-line fiber intensity modulator

Erji Mao, Christopher W. Coldren, James S. Harris, Diego R. Yankelevich, Olav Solgaard, and André Knoesen

Appl. Phys. Lett. 75, 310 (1999); http://dx.doi.org/10.1063/1.124359 (3 pages) | Cited 4 times

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We demonstrate a GaAs/AlGaAs multiple-quantum-well in-line fiber optic intensity modulator. Based on evanescent wave coupling between a GaAs/AlGaAs multiple-quantum-well waveguide and a single-mode fiber, this device concept combines the inherent advantages of in-line fiber devices with high-speed GaAs integrated optoelectronics. The GaAs waveguide uses distributed Bragg mirror layers to phase match to the low-index fiber. Intensity modulation of the transmitted light through the fiber is achieved by tuning the effective propagation index of the GaAs waveguide via the quantum-confined Stark effect. Initial structures show a modulation contrast (ΔT/T) of more than 53%, with an applied voltage of 5 V. © 1999 American Institute of Physics.
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78.66.Fd III-V semiconductors
85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)
85.60.-q Optoelectronic devices
42.79.Hp Optical processors, correlators, and modulators
42.81.Wg Other fiber-optical devices
78.20.Jq Electro-optical effects

Wavelength-tunable actively mode-locked erbium-doped fiber ring laser using a distributed feedback semiconductor laser as mode locker and tunable filter

Shenping Li and K. T. Chan

Appl. Phys. Lett. 75, 313 (1999); http://dx.doi.org/10.1063/1.124360 (3 pages) | Cited 7 times

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A wavelength-tunable actively mode-locked erbium fiber ring laser was demonstrated using a distributed feedback semiconductor laser as an intensity mode locker and a tunable optical filter. Very stable optical pulse trains at gigabit repetition rates were generated using harmonica mode locking. The supermode noise was suppressed to 60 dB below the signal level and the root-mean-square timing jitter (0.45 kHz–1 MHz) was found to be about 1% of the pulse duration. A continuous wavelength tuning range of 1.8 nm was achieved by changing the semiconductor laser temperature from 11.4 to 30 °C. © 1999 American Institute of Physics.  
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42.55.Wd Fiber lasers
42.60.By Design of specific laser systems
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
42.60.Fc Modulation, tuning, and mode locking
42.79.Ci Filters, zone plates, and polarizers

Coherent two-dimensional lasing action in surface-emitting laser with triangular-lattice photonic crystal structure

Masahiro Imada, Susumu Noda, Alongkarn Chutinan, Takashi Tokuda, Michio Murata, and Goro Sasaki

Appl. Phys. Lett. 75, 316 (1999); http://dx.doi.org/10.1063/1.124361 (3 pages) | Cited 16 times

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Lasing action of a surface-emitting laser with a two-dimensional photonic crystal structure is investigated. The photonic crystal has a triangular-lattice structure composed of InP and air holes, which is integrated with an InGaAsP/InP multiple-quantum-well active layer by a wafer fusion technique. Uniform two-dimensional lasing oscillation based on the coupling of light propagating in six equivalent Γ−X directions is successfully observed, where the wavelength of the active layer is designed to match the folded (second-order) Γ point of the Γ−X direction. The very narrow divergence angle of far field pattern and/or the lasing spectrum, which is considered to reflect the two-dimensional stop band, also indicate that the lasing oscillation occurs coherently. © 1999 American Institute of Physics.
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42.55.Px Semiconductor lasers; laser diodes
85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
42.70.Qs Photonic bandgap materials

Spectral narrowing in a rhodamine-doped layered TiO2/surfactant thin film

Elias Stathatos, Panagiotis Lianos, and Stelios Couris

Appl. Phys. Lett. 75, 319 (1999); http://dx.doi.org/10.1063/1.124362 (3 pages)

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Spectral narrowing has been observed in the emission of a rhodamine-6G-doped layered TiO2/surfactant thin film by both visible and near-ultraviolet laser excitation. Narrowing threshold was extensively decreased by combining waveguide and scatter gain and by exploiting the self-organizing capacity of the surfactant molecules and the unusual optical matching between the TiO2 nanoparticle layer and the organic surfactant layer. © 1999 American Institute of Physics.
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78.66.Qn Polymers; organic compounds
78.40.Me Organic compounds and polymers
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)

Organic multilayers as distributed Bragg reflectors

A. Convertino, A. Valentini, and R. Cingolani

Appl. Phys. Lett. 75, 322 (1999); http://dx.doi.org/10.1063/1.124363 (3 pages) | Cited 12 times

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We report on a distributed Bragg reflector (DBR) operating in the IR spectral region, based on a fluorocarbon polymer (CFx) multilayer. In this organic structure, the periodic variation of the refractive index is obtained by embedding gold clusters in the CFx, resulting in a periodic CFx/CFx(Au) layered structure with a refractive index discontinuity in the infrared spectral region of about Δn ∼ 0.4. We have fabricated a quarter-wavelength stack consisting of 4 CFx/CFx(Au) pairs, with a nominal Au concentration equal to 17%. The DBR shows a reflectance peak of about 70% at 1.7 μm and a full width at half maximum of about 0.4 μm. © 1999 American Institute of Physics.
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42.70.Jk Polymers and organics
42.79.Wc Optical coatings
78.66.Qn Polymers; organic compounds
78.35.+c Brillouin and Rayleigh scattering; other light scattering
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

Red, green, and blue laser light from a single Nd:YAl3(BO3)4 crystal based on laser oscillation at 1.3 μm

D. Jaque, J. Capmany, and J. García Solé

Appl. Phys. Lett. 75, 325 (1999); http://dx.doi.org/10.1063/1.124364 (3 pages) | Cited 64 times

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Laser radiation corresponding to the three fundamental colors (red, green, and blue) has been generated from the same Nd:YAl3(BO3)4 crystal, operating on a fundamental laser wavelength of 1338 nm in an end-pumping configuration. Continuous wave generation was obtained by pumping with a tunable Ti: sapphire laser. Red (669 nm) has been obtained by self-frequency doubling of the fundamental laser line. Green (505 nm) and blue (481 nm) have been obtained by self-sum-frequency mixing of the fundamental laser radiation at 1338 nm and the pump radiation (807 nm for green and 755 nm for blue). © 1999 American Institute of Physics.
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42.55.Rz Doped-insulator lasers and other solid state lasers
42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
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