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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.
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
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.
Publication 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.
This paper describes the 10-Gb/s, full
Shuanghong 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)]
Author(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
Daniel 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.
Yuechun 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)]
Boon 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)]
Publication year: 2013
Source:Optics Communications, Volume 290
M. Aas, A. Jonáš, A. Kiraz