APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

23 Feb 1998

Volume 72, Issue 8, pp. 873-995

Return to All Sections
back to top
RSS Feeds

Electro-optic modulation of laser diode light by mode interference in a multilayer waveguide including a 2-docosylamino-5-nitropyridine Langmuir–Blodgett film

L. Palchetti, S. Sottini, D. Grando, E. Giorgetti, R. Ricceri, and G. Gabrielli

Appl. Phys. Lett. 72, 873 (1998); http://dx.doi.org/10.1063/1.120921 (3 pages) | Cited 2 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A hybrid four layer guide (FLG) including a glass guide and a 2-docosylamino-5-nitropyridine Langmuir–Blodgett film is described, and some tests are reported on an electro-optic modulator based on this FLG. The modulation of laser diode light was obtained by guided mode interference, without a Mach–Zehnder configuration of the device. From the modulated signal the r22 electro-optic coefficient was calculated as 11 pm/V. © 1998 American Institute of Physics.
Show PACS
42.79.Hp Optical processors, correlators, and modulators
42.79.Gn Optical waveguides and couplers
42.70.Jk Polymers and organics
42.79.Ry Gradient-index (GRIN) devices

Ultralow-threshold (50 A/cm2) strained single-quantum-well GaInAsSb/AlGaAsSb lasers emitting at 2.05 μm

G. W. Turner, H. K. Choi, and M. J. Manfra

Appl. Phys. Lett. 72, 876 (1998); http://dx.doi.org/10.1063/1.120922 (3 pages) | Cited 60 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Strained single-quantum-well, broadened-waveguide GaInAsSb/AlGaAsSb diode lasers have exhibited room-temperature threshold current densities as low as 50 A/cm2, one of the lowest values reported for diode lasers at room temperature. These lasers, grown by molecular beam epitaxy, have emission wavelengths of ∼ 2.05 μm, characteristic temperature of 65 K, internal quantum efficiency of 95%, and internal loss coefficient of 7 cm−1. Single-ended cw power of 1 W is obtained for a 100-μm aperture. © 1998 American Institute of Physics.  
Show PACS
42.55.Px Semiconductor lasers; laser diodes
42.60.By Design of specific laser systems
81.05.Ea III-V semiconductors
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy

Self-diffraction from free surface relief gratings in a photorefractive Bi12TiO20 crystal

S. Stepanov, N. Korneev, A. Gerwens, and K. Buse

Appl. Phys. Lett. 72, 879 (1998); http://dx.doi.org/10.1063/1.120923 (3 pages) | Cited 14 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Experimental results on self-diffraction of periodically phase-modulated laser beams from a relief grating formed on a free surface of a cubic photorefractive Bi12TiO20 crystal due to the piezoelectric effect are reported. Periodic intensity modulations of the reflected beams up to 10−2 due to energy exchange at this unshifted phase grating are measured. The modulation depends linearly on the fringe spacing and on the amplitude of an externally applied electric dc field. The observed self-diffraction process is independent of the light polarization. © 1998 American Institute of Physics.
Show PACS
78.20.-e Optical properties of bulk materials and thin films
42.79.Dj Gratings

Optical absorption and multiphonon relaxation of Nd3+ ions in ZnCl2-based glass

M. Shojiya, M. Takahashi, R. Kanno, Y. Kawamoto, and K. Kadono

Appl. Phys. Lett. 72, 882 (1998); http://dx.doi.org/10.1063/1.120924 (3 pages) | Cited 5 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Optical absorption and multiphonon relaxation have been investigated for Nd3+-doped ZnCl2-based glass. The intensity parameters for radiative transitions of Nd3+ were determined to be Ω2 = 4.97×10−20 cm2, Ω4 = 7.39×10−20 cm2 and Ω6 = 5.12×10−20 cm2. All of the Ωt parameters, especially Ω4, of Nd3+ in the ZnCl2-based glass were large compared with those reported for oxide and fluoride glasses. Multiphonon relaxation rates for three emission levels of Nd3+ were determined from lifetime measurements. The multiphonon relaxation rates in the ZnCl2-based glass were extremely low, because of the low-phonon-energy of the matrix. Values were found to obey the energy-gap law in the same manner as the values in Er3+-doped ZnCl2-based glasses. © 1998 American Institute of Physics.
Show PACS
78.40.Pg Disordered solids
42.70.Ce Glasses, quartz
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
63.20.K- Phonon interactions
71.23.Cq Amorphous semiconductors, metallic glasses, glasses

Polymer-stabilized diffraction gratings from cholesteric liquid crystals

S. N. Lee, L. C. Chien, and S. Sprunt

Appl. Phys. Lett. 72, 885 (1998); http://dx.doi.org/10.1063/1.120925 (3 pages) | Cited 15 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report the use of a low concentration polymer network to stabilize electric field-induced diffraction gratings in cholesteric liquid crystals. The stabilized gratings can be electrically switched between a zero-field “on” state, which exhibits approximately 75% diffraction efficiency, and a moderate field (typically 3 V/μm) “off” state. Grating spacings between 1.7 and 30 μm are obtained in a 10 μm thick cell by variation of the concentration of chiral dopant used to form the cholesteric liquid crystal. © 1998 American Institute of Physics.
Show PACS
61.30.Gd Orientational order of liquid crystals; electric and magnetic field effects on order
42.79.Dj Gratings
78.20.Jq Electro-optical effects
83.80.Xz Liquid crystals: nematic, cholesteric, smectic, discotic, etc.

Effect of many weak side modes on relative intensity noise of distributed feedback semiconductor lasers

Eva Peral, William K. Marshall, Dan Provenzano, and Amnon Yariv

Appl. Phys. Lett. 72, 888 (1998); http://dx.doi.org/10.1063/1.120926 (3 pages) | Cited 4 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
An increase of the relative intensity noise of nearly single-mode distributed feedback lasers with respect to that predicted by single-mode theory after propagation in dispersive fiber at frequencies up to 5 Ghz has been measured. A simplified multimode theory is presented which explains the increase in noise. © 1998 American Institute of Physics.
Show PACS
42.55.Px Semiconductor lasers; laser diodes
42.60.Mi Dynamical laser instabilities; noisy laser behavior
42.60.Fc Modulation, tuning, and mode locking

Electromagnetic characterization of vertical-cavity surface-emitting lasers based on a vectorial eigenmode calculation

D. Burak and R. Binder

Appl. Phys. Lett. 72, 891 (1998); http://dx.doi.org/10.1063/1.120927 (3 pages) | Cited 8 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A complete theoretical approach to the electromagnetic properties of vertical-cavity surface-emitting lasers (VCSELs) is presented. The solution of the 3D vector Maxwell equations is obtained by means of a generalized vectorial transform matrix. Results for the characterization of laser modes include modal frequencies, cavity losses, and eigenmode light-field vector patterns. As an example, modal properties of air-post index-guided VCSELs are analyzed for various cavity design parameters. Scattering losses due to modal mismatch at cavity interfaces are found to be small and, hence, would not overcompensate potential cavity design improvements based on increased relative index steps. © 1998 American Institute of Physics.
Show PACS
42.55.Px Semiconductor lasers; laser diodes
42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
78.66.Fd III-V semiconductors
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close