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Oral mucosa response to laser patterned microcoagulation (LPM) treatment. An animal study
Thu, 2012-02-09 19:26 — Guest
gingival and oral mucosal tissue regeneration. We performed a feasibility assessment and histological examination of laser
damage and regeneration in the gingiva and oral mucosa using an animal model. The study animals comprised 18 healthy rabbits
which were treated in vivo with single pulses from a diode laser at a wavelength of 980 nm and a power of up to 20 W applied
to the gingival and oral mucosa at multiple time points. Biopsies were stained with hematoxylin and eosin, nitroblue tetrazolium
chloride and picrosirius red, and evaluated by two pathologists blinded to the parameters and date of laser exposure. Histological
analysis revealed that the continuity of the epithelial basal cell layer had been reestablished by 1–2 days after LPM, and
complete epithelial regeneration had occurred by 7–12 days. A pronounced reactive inflammation developed in the column area
1 day after treatment.
The concept of 2D gated imaging for particle sizing in a laminar diffusion flame
Sat, 2013-05-18 02:00 — GuestAbstract
In this work, time-resolved laser-induced incandescence (TiRe LII) has been employed to measure primary particle diameters of soot in an atmospheric laminar ethylene diffusion flame. The generated data set complements existing data determined in one single location and takes advantage of the good spatial resolution of the ICCD detection. Time resolution is achieved by shifting the camera gate along the LII decay. One key input parameter for the analysis of time-resolved LII is the local flame temperature. This was determined on a grid throughout the flame by coherent anti-Stokes Raman scattering. The accurate temperature data, in combination with other published data from this flame, are well suited for soot model validation purposes while we showed feasibility of a shifted gate approach to deduce 2D particle sizes in the chosen standard flame.
Influence of the 61 S 0–63 P 1 resonance on continuous Lyman-α generation in mercury
Sat, 2013-05-18 02:00 — GuestAbstract
Continuous coherent radiation in the vacuum ultraviolet at 122 nm (Lyman-α) can be generated using sum-frequency mixing of three fundamental laser beams in mercury vapor. One of the fundamental beams is at 254 nm wavelength, which is close to the 61
S
0–63
P
1 resonance in mercury. Experiments have been performed to investigate the effect of this one-photon resonance on phase-matching, absorption and the nonlinear yield. The efficiency of continuous Lyman-α generation has been improved by a factor of 4.5.
HgCdTe avalanche photodiodes: A review
Fri, 2011-04-01 07:57 — GuestPublication year: 1
Source: Optics & Laser Technology, In Press, Corrected Proof, Available online 31 March 2011
Anand, Singh , Vanya, Srivastav , Ravinder, Pal
This paper presents a comprehensive review of fundamental issues, device architectures, technology development and applications of HgCdTe based avalanche photodiodes (APD). High gain, above 5×103, a low excess noise factor close to unity, THz gain-bandwidth product, and fast response in the range of pico-seconds has been achieved by electron-initiated avalanche multiplication for SWIR, MWIR, and LWIR detector applications involving low optical signals. Detector arrays with good element-to-element uniformity have been fabricated paving the way for fabrication of HgCdTe-APD FPAs.
Full -Band 10-Gb/s 40-km SMF Transmission of InGaAlAs Electroabsorption Modulator
Fri, 2010-10-08 23:01 — GuestThis paper describes the 10-Gb/s, full
Theoretical and experimental study on passively Q-switched intracavity frequency-doubled solid-state yellow Raman lasers
Mon, 2013-05-20 02:00 — GuestShuanghong Ding, Wenhui Zhang, Shiwu Wang, Xichang Wang, Jun Zhang, Meiqin Wang
Normalized space-dependent rate equations of passively Q-switched intracavity frequency-doubled Raman lasers are deduced for the first time. The normalized rate equations are solved numerically to investigate the influences of the normalized variables on the yellow laser performance. The LD ... [Appl. Opt. 52, 3583-3590 (2013)]
Two-dimensional s-polarized solitary waves in plasmas. II. Stability, collisions, electromagnetic bursts, and post-soliton evolution
Fri, 2011-09-09 02:00 — GuestAuthor(s): G. Sánchez-Arriaga and E. Lefebvre
The dynamics of two-dimensional s-polarized solitary waves is investigated with the aid of particle-in-cell (PIC) simulations. Instead of the usual excitation of the waves with a laser pulse, the PIC code was directly initialized with the numerical solutions from the fluid plasma model. This techniq...
[Phys. Rev. E 84, 036404] Published Fri Sep 09, 2011
Fine adjustment of cavity loss by Sagnac loop for a dual wavelength generation
Thu, 2010-04-08 20:03 — Guest
or dual wavelengths are obtained by controlling the losses on both cavities through a fiber optical loop mirror (FOLM). Wavelength
separation on the dual laser is 0.98 nm. The dual or single wavelength is obtained by changes in temperature in the order
of 10−1°C around the maximum in the FOLM. Also, we investigate energy fluctuations on signal level saturation effect in the cavity
through different pumping power that act on the EDF, where we note that from the 60-mW pumping begins to generate dual-wavelength
and 80-mW stabilizes.
Narrow linewidth tunable external cavity diode laser using wide bandwidth filter
Fri, 2012-02-24 19:01 — GuestDaniel J. Thompson and Robert E. Scholten
We demonstrate single mode operation of an external cavity diode laser (ECDL) employing an interference filter with multimode bandwidth for mode selection. A cateye reflector maximizes feedback efficiency and reduces susceptibility to intra-cavity optical misalignment. Narrow linewidths of 26 kHz ar ... [Rev. Sci. Instrum. 83, 023107 (2012)] published Fri Feb 24, 2012.
Analysis and optimization of propagation losses in LiNbO3 optical waveguides produced by swift heavy-ion irradiation
Tue, 2012-02-07 20:09 — Guest
an alternative to conventional ion implantation, have been investigated and optimized. For waveguide fabrication, congruently
melting LiNbO3 substrates were irradiated with F ions at 20 MeV or 30 MeV and fluences in the range 1013–1014 cm−2. The influence of the temperature and time of post-irradiation annealing treatments has been systematically studied. Optimum
propagation losses lower than 0.5 dB/cm have been obtained for both TE and TM modes, after a two-stage annealing treatment
at 350 and 375∘C. Possible loss mechanisms are discussed.
A portable laser system for high-precision atom interferometry experiments
Sat, 2010-10-16 09:49 — Guest
for a portable gravimeter based on atom interferometry that will be capable of performing high-precision gravity measurements
directly at sites of geophysical interest. This laser system is constructed in a compact and mobile design so that it can
be transported to different locations, yet it still offers improvements over many conventional laboratory-based laser systems.
Our system is contained in a standard 19″ rack and emits light at five different frequencies simultaneously on up to 12 fibre
ports at a total output power of 800 mW. These frequencies can be changed and switched between ports in less than a microsecond.
The setup includes two phase-locked diode lasers with a phase noise spectral density of less than 1 μrad/Hz1/2 in the frequency range in which our gravimeter is most sensitive to noise.
Experimental demonstration of the three phase shifted DFB semiconductor laser based on Reconstruction-Equivalent-Chirp technique
Mon, 2012-07-30 02:00 — GuestYuechun Shi, Xiangfei Chen, Yating Zhou, Simin Li, Lianyan Li, Yijun Feng
A three phase shifted (3PS) distributed feedback (DFB) semiconductor laser based on Reconstruction-Equivalent-Chirp (REC) technique is experimentally demonstrated for the first time. The simulation results show that the performances of the equivalent 3PS DFB semiconductor laser are nearly the same ... [Opt. Express 20, 17374-17379 (2012)]
Detection of ion micromotion in a linear Paul trap with a high finesse cavity
Mon, 2013-05-06 02:00 — GuestBoon Leng Chuah, Nicholas C. Lewty, Radu Cazan, Murray D. Barrett
We demonstrate minimization of ion micromotion in a linear Paul trap with the use of a high finesse cavity. The excess ion micromotion projected along the optical cavity axis or along the laser propagation direction manifests itself as sideband peaks around the carrier in the ion-cavity emission ... [Opt. Express 21, 10632-10641 (2013)]
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Lasing in optically manipulated, dye-doped emulsion microdroplets
Thu, 2012-11-29 11:02 — GuestPublication year: 2013
Source:Optics Communications, Volume 290
M. Aas, A. Jonáš, A. Kiraz
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