2,389 research outputs found
Dispersion-induced generation of higher order transversal modes in singly-resonant optical parametric oscillators
We study the effects of higher order transversal modes in a model of a
singly-resonant OPO, using both numerical solutions and mode expansions
including up to two radial modes. The numerical and two-mode solutions predict
lower threshold and higher conversion than the single-mode solution at negative
dispersion. Relative power in the zero order radial mode ranges from about 88%
at positive and small negative dispersion to 48% at larger negative dispersion,
with most of the higher mode content in the first mode, and less than 2% in
higher modes.Comment: 13 pages, 4 figures, PACS Numbers: 42.65.Ky, 42.10.Qj, Key Words:
parametric oscillation, phase-matching, diffractio
Study of the dynamic formation of transmission gratings recorded in photopolymers and holographic polymer-dispersed liquid crystals
Local and nonlocal models for the diffusion of photopolymers are applied to the dynamic formation of
transmission gratings recorded in photopolymers and holographic polymer-dispersed liquid crystals (H-PDLCs). We retrieve the main parameters of H-PDLCs (refractive-index modulation and diffusion coefficient) by combining a solution of the one-dimensional diffusion equation and the rigorous coupledwave theory applied to transmission gratings. The rigorous coupled-wave theory method provides us with information on higher harmonics of the refractive profile (not only on the first harmonic as when the
classical Kogelnik theory is applied). Measurements concerning the second harmonic validate the modeling
Integrated Optics: a Report on the 2nd OSA Topical Meeting
This report surveys the papers presented at the 2nd OSA Topical Meeting on Integrated Optics, which was held 21–24 January 1974 in New Orleans, La
Coherent analysis of quantum optical sideband modes
We demonstrate a device that allows for the coherent analysis of a pair of
optical frequency sidebands in an arbitrary basis. We show that our device is
quantum noise limited and hence applications for this scheme may be found in
discrete and continuous variable optical quantum information experiments.Comment: 3 pages, 3 figures, submitted to Optics Letter
Large bandwidth, highly efficient optical gratings through high index materials
We analyze the diffraction characteristics of dielectric gratings that
feature a high index grating layer, and devise, through rigorous numerical
calculations, large bandwidth, highly efficient, high dispersion dielectric
gratings in reflection, transmission, and immersed transmission geometry. A
dielectric TIR grating is suggested, whose -1dB spectral bandwidth is doubled
as compared to its all-glass equivalent. The short wavelength diffraction
efficiency is additionally improved by allowing for slanted lamella. The
grating surpasses a blazed gold grating over the full octave. An immersed
transmission grating is devised, whose -1dB bandwidth is tripled as compared to
its all-glass equivalent, and that surpasses an equivalent classical
transmission grating over nearly the full octave. A transmission grating in the
classical scattering geometry is suggested, that features a buried high index
layer. This grating provides effectively 100% diffraction efficiency at its
design wavelegth, and surpasses an equivalent fused silica grating over the
full octave.Comment: 15 pages, 7 figure
Stokes-space formalism for Bragg scattering in a fiber
Optical frequency conversion by four-wave mixing (Bragg scattering) in a
fiber is considered. The evolution of this process can be modeled using the
signal and idler amplitudes, which are complex, or Stokes-like parameters,
which are real. The Stokes-space formalism allows one to visualize power and
phase information simultaneously, and produces a simple evolution equation for
the Stokes parameters
Thermal noise of a plano-convex mirror
We study theoretically the internal thermal noise of a mirror coated on a
plano-convex substrate. The comparison with a cylindrical mirror of the same
mass shows that the effect on a light beam can be reduced by a factor 10,
improving the sensitivity of high-precision optical experiments such as
gravitational-wave interferometers.Comment: 5 pages, 5 figures, RevTe
Extreme Outages due to Polarization Mode Dispersion
We investigate the dependence of the bit-error-rate (BER) caused by amplifier
noise in a linear optical fiber telecommunication system on the fiber
birefringence. We show that the probability distribution function (PDF) of BER
obtained by averaging over many realizations of birefringent disorder has an
extended tail corresponding to anomalously large values of BER. We specifically
discuss the dependence of the tail on such details of the pulse detection at
the fiber output as "setting the clock" and filtering procedures.Comment: 3 pages, 1 figure, submitted to Optics Letter
Bragg solitons in nonlinear PT-symmetric periodic potentials
It is shown that slow Bragg soliton solutions are possible in nonlinear
complex parity-time (PT) symmetric periodic structures. Analysis indicates that
the PT-symmetric component of the periodic optical refractive index can modify
the grating band structure and hence the effective coupling between the forward
and backward waves. Starting from a classical modified massive Thirring model,
solitary wave solutions are obtained in closed form. The basic properties of
these slow solitary waves and their dependence on their respective PT-symmetric
gain/loss profile are then explored via numerical simulations.Comment: 6 pages, 4 figures, published in Physical Review
Active feedback of a Fabry-Perot cavity to the emission of a single InAs/GaAs quantum dot
We present a detailed study of the use of Fabry-Perot (FP) cavities for the
spectroscopy of single InAs quantum dots (QDs). We derive optimal cavity
characteristics and resolution limits, and measure photoluminescence linewidths
as low as 0.9 GHz. By embedding the QDs in a planar cavity, we obtain a
sufficiently large signal to actively feed back on the length of the FP to lock
to the emission of a single QD with a stability below 2% of the QD linewidth.
An integration time of approximately two seconds is found to yield an optimum
compromise between shot noise and cavity length fluctuations.Comment: 7 pages, 3 figure
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