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Fringes of total atomic density produced in an atom interferometer consisting of two off-resonant standing wave pulses were directly imaged using an ldquooptical maskrdquo technique. Fringe periods with integer fractions of the standing-wave period were observed.
Spin gratings lasting longer than the carrier lifetime are measured in lightly n-doped quantum wells. In a magnetic field, precession of the grating is observed, and diffusion rates are determined by varying the grating period.
We report a compact, narrow-line intracavity OPO with a grazing-incidence grating. This kHz pulsed OPO fits into a 25 times 25 cm area, generating 30 muJ/pulse at 1560 nm with a linewidth of 0.8 cm-1.
Results on the inscription of Type IIA Bragg gratings in B-germanosilicate fibres using 248 nm, 500 fs laser radiation are presented. The gratings recorded exhibit index changes Deltan ap 10-3, while they remain intact for temperatures up to 650degC.
We change the pitch of interferometrically written 1-dimensional periodic structures by adjusting the frequency shift between two interfering beams. This technique is applicable to fabrication of both planar and fiber Bragg gratings.
Two-beam pumped noncollinear PPKTP OPO generating two signal waves with tunable spectral separation is demonstrated. The coherent pumping leads to a parametric gain grating which resonantly enhances cascaded sideband generation by the second-order nonlinear interaction.
The relationship between the physical fabrication of asymmetric cladding surface etched DBR structures and the resulting optical characteristics are characterized. The effective index step and DBR scattering loss for these structures is determined.
Long-range periodic nanoplane gratings written inside fused silica using a focused femtosecond laser beam can be erased and replaced with new gratings whose orientation is determined by the polarization of the femtosecond laser overwrite beam.
We demonstrated an optofluidic distributed feedback (DFB) dye laser on a poly(dimethylsiloxane) (PDMS) chip. Single-mode operation was obtained with 0.21 nm linewidth. We achieved nearly 60 nm continuously tunable output by mechanically varying the grating period.
We demonstrate the formation of long period gratings in fluid-filled photonic bandgap fiber (PBGF). The unique modal properties of PBGFs allow for coupling to LP11-like modes at multiple wavelengths. We obtain good agreement with simulations.
Group velocity reduction of sub-nanosecond optical pulses at 1.5 mum is experimentally demonstrated in superstructure Bragg gratings, including Moire and phase-shifted gratings, fabricated on photosensitive fibers by the continuous-writing technique.
We present a novel application of the spectrally-dispersed two-beam interferometry for the coherent addition of pulses for energy. Our device measures the relative delay of pulse-to-pulse envelope between two laser pulses with few fs accuracy.
We present a theoretical and experimental analysis of two-grating phasing in a broadband pulse mosaic compressor. The phase defaults induced by misaligned gratings and the grating gap effect are studied in a mosaic compressor scheme.
We describe the strong wavelength-stabilization of high-brightness extended-cavity lasers based on 808-nm and 976-nm tapered amplifiers by use of volume Bragg gratings. Single-frequency operation has been obtained in a robust and simple design.
The spectral response is presented for resonant reflection/transmission or resonant absorption of guided mode resonant devices with the addition of a uniform gain or loss.
A novel multi-line filter using two-dimensional guided mode resonant (2D-GMR) filter is proposed. The locations of resonances are specifically controlled by modifying only the periodicity of the grating and other physical dimensions of the structure.
Transmission hologram is suggested with two volume gratings for diffraction A to B via intermediate wave C. High diffraction efficiency, low sensitivity to polarization and hologram strength, good spectral and angular selectivity are predicted.
Diffraction gratings (1D and 2D) were recorded with femtosecond laser pulses in KDP samples. The resulting device behaves as an integrated frequency-doubling beam splitter when irradiated with intense laser radiation.
We report the experimental demonstration of a novel distributed fiber-optic strain sensor by localizing a dynamic grating in polarization maintaining erbium-doped fiber (PM-EDF) using the technique of synthesis of optical coherence function (SOCF).
A new Brewster cut acousto-optic programmable gain control filter combined with an AOPDF pulse shaper optimizes the spectral losses of a 10 Hz CPA Ti:sapphire regenerative amplifier to obtain 18 fs duration, 1.2%-rms stability, 107 contrast ratio.
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