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7 Sep 1998

Volume 73, Issue 10, pp. 1311-1448

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Repetition-rate multiplication in actively mode-locked fiber lasers by higher-order FM mode locking using a high-finesse Fabry–Perot filter

Kazi Sarwar Abedin, Noriaki Onodera, and Masaharu Hyodo

Appl. Phys. Lett. 73, 1311 (1998); http://dx.doi.org/10.1063/1.121879 (3 pages) | Cited 17 times

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We demonstrate an FM mode-locking technique for multiplying the pulse repetition rate of lasers by several times above the modulation frequency. The mode locking of the laser is based on the generation of higher-order FM sidebands by an intracavity phase modulator and the periodic selection of the sidebands by an intracavity high-finesse Fabry–Perot filter at spacings of free spectral range which is a harmonic of the modulation frequency. We show the generation of stable, uniformly spaced, equal amplitude optical pulses from a fiber ring laser with two-, three-, and fourfold enhancement in the repetition rate. © 1998 American Institute of Physics.
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42.60.Fc Modulation, tuning, and mode locking
42.55.Wd Fiber lasers
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
42.79.Ci Filters, zone plates, and polarizers

High-finesse disk microcavity based on a circular Bragg reflector

D. Labilloy, H. Benisty, C. Weisbuch, T. F. Krauss, C. J. M. Smith, R. Houdré, and U. Oesterle

Appl. Phys. Lett. 73, 1314 (1998); http://dx.doi.org/10.1063/1.121880 (3 pages) | Cited 35 times

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We made disk-shaped microcavities of approximately 10 μm2 in area in a GaAs/AlGaAs waveguide structure by etching deep vertical concentric trenches. The trenches form a circular Bragg-like reflector that confines light in the remaining two lateral dimensions. We demonstrate from photoluminescence excited in the waveguide the confinement of discrete disk modes whose wave vector is mainly radial, in contrast with whispering gallery modes. Their quality factors up to Q = 650 indicate in-plane reflectivities approaching 90%. In the near infrared, this represents a demonstration of wavelength-scale light confinement based on photonic crystal effects in two dimensions. © 1998 American Institute of Physics.
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42.55.Sa Microcavity and microdisk lasers
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
42.55.Px Semiconductor lasers; laser diodes
42.60.By Design of specific laser systems
81.05.Ea III-V semiconductors
73.40.Kp III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
81.65.Cf Surface cleaning, etching, patterning
78.55.Cr III-V semiconductors
78.66.Fd III-V semiconductors
42.79.Gn Optical waveguides and couplers
42.70.Qs Photonic bandgap materials
42.50.-p Quantum optics

Photogeneration and modification of birefringence in crosslinked films of liquid crystal/polymer composites

Shin’ya Morino, Aki Kaiho, and Kunihiro Ichimura

Appl. Phys. Lett. 73, 1317 (1998); http://dx.doi.org/10.1063/1.121881 (3 pages) | Cited 7 times

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A binary composite consisting of a low-mass nematic liquid crystal and a crosslinked polymer bearing azobenzene chromophores exhibited thermally stable birefringence upon linearly polarized light irradiation owing to the angular-selective photoexcitation of the chromophores. The extent of photoinduced birefringence was critically dependent on temperatures during the photoirradiation. The largest photoinduced birefringence of 0.05 was obtained at 75 °C—slightly lower than TNI of the liquid crystal. The photogenerated birefringence was overwritten on linearly polarized light irradiation. © 1998 American Institute of Physics.  
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78.66.Qn Polymers; organic compounds
42.25.Lc Birefringence
78.20.Fm Birefringence
42.70.Df Liquid crystals
61.30.-v Liquid crystals

Accurate measurement of laser-driven shock trajectories with velocity interferometry

P. M. Celliers, G. W. Collins, L. B. Da Silva, D. M. Gold, and R. Cauble

Appl. Phys. Lett. 73, 1320 (1998); http://dx.doi.org/10.1063/1.121882 (3 pages) | Cited 60 times

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We describe a velocity interferometer used to measure the velocity and trajectory of laser driven shocks in liquid deuterium accurately and continuously. This demonstration of velocity interferometry to measure shock velocity and shock trajectory in condensed matter shows strong potential for future studies of laser-driven shocks in transparent media. Accuracy of this technique can be better than 1% in velocity and ±0.2 μm in position during a 10 ns interval. © 1998 American Institute of Physics.
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62.50.-p High-pressure effects in solids and liquids
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
07.60.Ly Interferometers
06.30.Gv Velocity, acceleration, and rotation
06.60.Jn High-speed techniques (microsecond to femtosecond)
07.68.+m Photography, photographic instruments; xerography
62.10.+s Mechanical properties of liquids

Optical data storage in C60 doped polystyrene film by photo-oxidation

A. D. Xia, S. Wada, and H. Tashiro

Appl. Phys. Lett. 73, 1323 (1998); http://dx.doi.org/10.1063/1.121883 (3 pages) | Cited 15 times

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A potential application of C60 for three-dimensional optical data storage in read only memory recorded by photo-oxidation is investigated. Photo-oxidation significantly enhances the fluorescence intensity of C60 molecules; therefore, one bit data can be recorded by the photo-oxidation of C60 doped polystyrene film at individual points by a focused laser beam and be read nondestructively as a brilliant fluorescence spot, in contrast to the nonoxidized areas after photo-oxidation is blocked. This enables three-dimensional recording using a laser scanning microscope. As a result, a pattern consisting of three layers of bit data was written and read in a C60 doped polystyrene film. We also discuss the time course of photo-oxidation of C60. © 1998 American Institute of Physics.
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78.55.Kz Solid organic materials
81.65.Mq Oxidation
42.79.Vb Optical storage systems, optical disks
61.41.+e Polymers, elastomers, and plastics
68.55.Ln Defects and impurities: doping, implantation, distribution, concentration, etc.
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