Compact green laser source using butt-coupling between multi-section DFB-laser and SHG waveguide crystal

2008 ◽  
Vol 44 (25) ◽  
pp. 1463 ◽  
Author(s):  
J. Wiedmann ◽  
O. Brox ◽  
T. Tekin ◽  
F. Scholz ◽  
T. Büttner ◽  
...  
Keyword(s):  
Green Laser ◽  
Laser Source ◽  
Dfb Laser ◽  
Butt Coupling

20.2: High-Efficiency Green Laser Source for Compact Projectors

2009 ◽  
Vol 40 (1) ◽  
pp. 265 ◽  
Author(s):  
John Khaydarov ◽  
Andrei Shchegrov ◽  
Stepan Essaian ◽  
Greg Nemet ◽  
Suren Soghomonyan ◽  
...  
Keyword(s):  
High Efficiency ◽  
Green Laser ◽  
Laser Source

Complex-coupled wavelength-selectable dfb laser source for coarse WDM

2008 ◽  
Author(s):  
Hong-yun Xie ◽  
Jia Li ◽  
Jun-ning Gan ◽  
Pei Shen ◽  
Yi-wen Huang ◽  
...  
Keyword(s):  
Laser Source ◽  
Dfb Laser

73.4L: Late-News Paper: Miniature, Highly Efficient, and Low Cost Green Laser Source for Pico-Projectors

2011 ◽  
Vol 42 (1) ◽  
pp. 904-907
Author(s):  
Stepan Essaian ◽  
John Khaydarov ◽  
Slav Slavov ◽  
Gevorg Gabrielyan ◽  
Armen Poghosyan ◽  
...  
Keyword(s):  
Low Cost ◽  
Green Laser ◽  
Laser Source ◽  
Highly Efficient ◽  
Late News

scholarly journals Development of a Frequency Tunable Green Laser Source for Advanced Virgo+ Gravitational Waves Detector

Galaxies ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 87
Author(s):  
Camilla De Rossi ◽  
Jonathan Brooks ◽  
Julia Casanueva Diaz ◽  
Antonino Chiummo ◽  
Eric Genin ◽  
...  
Keyword(s):  
Gravitational Waves ◽  
Optical Cavity ◽  
Green Laser ◽  
Laser Source ◽  
Acquisition Strategy ◽  
Frequency Tunable ◽  
One Year

After one year of data taking, the observing run three (O3), we are preparing for an improved version of the system, named the Advanced Virgo plus. One of the major upgrades will be the installation of the signal recycling mirror to form an additional optical cavity and improve the sensitivity of the interferometer. This also requires a change in the lock acquisition strategy. In particular, the arms will be locked at the beginning with lasers at a different wavelength from the main one. Such a strategy has already been implemented and tested in LIGO and KAGRA, and in this paper we will present how it has been conceived in Virgo.

Ophthalmological Diagnostic Complex Based on a Slit Lamp and Multi-Waves Laser

10.12737/2742 ◽  
2013 ◽  
Vol 20 (4) ◽  
pp. 109-113
Author(s):  
Соболев ◽  
Yu. Sobolev ◽  
Иванов ◽  
A. Ivanov ◽  
Астахов ◽  
...  
Keyword(s):  
Anterior Segment ◽  
Green Laser ◽  
Laser Source ◽  
Slit Lamp ◽  
Laser Trabeculoplasty ◽  
Medical Institutions ◽  
Medical Diagnostic ◽  
Stereoscopic Observation ◽  
Diagnostic Complex ◽  
Technical Features

The paper presents the ophthalmological diagnostic complex based on slit lamp, equipped with equipment for laser pa-nretinal photocoagulation. Pre-existing principle of construction of the ophthalmologic lasers involves a cascade of work of waves of different length, while in the new version of the device the ability to use two waves simultaneously and implementation of adjustment of the intensity of each wavelength. Pattern-scanning laser ophthalmo-coagulator works at two wavelengths 532 nm and 810 nm. Use of multi-waves laser source expands the range of possible applications in the treatment of retinal diseases. Medical-diagnostic complex is intended for stereoscopic observation, investigation of the anterior segment of the eyeball, lens, retina in medical, medical-preventive and research medical institutions and private clinics. This device allows to effectively conduct operations as pattern retinal laser photo-coagulation and laser trabeculoplasty green laser, and transpupilar thermotherapy of choroidal neovascularization, transcleral retinal photocoagulation and ciliary body by means of infrared (IR) laser. In the multi-colored photocoagulator, the technologies of "automatic positioning of the field of coagulation"(PASCAL) are used. The paper discusses the technical features of the instrument and its development prospects.

scholarly journals Trace CH4 Gas Detection Based on an Integrated Spherical Photoacoustic Cell

2021 ◽  
Vol 11 (11) ◽  
pp. 4997
Author(s):  
Yexiang Jiao ◽  
Hongji Fan ◽  
Zhenfeng Gong ◽  
Kai Yang ◽  
Feiyang Shen ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
High Speed ◽  
Gas Detection ◽  
Laser Source ◽  
Photoacoustic Cell ◽  
Long Distance ◽  
Element Simulation ◽  
Resonant Modes ◽  
All Optical ◽  
Dfb Laser

This paper presents an integrated spherical photoacoustic cell (SPAC) for trace methane (CH4) gas detection. Theoretical analysis and analogue simulations are carried out to analyze the acoustic field distribution of the SPAC at resonant and non-resonant modes. The finite element simulation results based on COMSOL show that the first-order radial resonant frequency and second-order angular resonant frequency are 24,540 Hz and 18,250 Hz, respectively, which show good agreements with the formula analysis results. The integrated SPAC, together with a high-speed spectrometer and a distributed feedback (DFB) laser source, makes up a photoacoustic (PA) spectroscopy (PAS) system, which is employed for CH4 detection. The minimum detection limit (MDL) is measured to be 126.9 parts per billion (ppb) at an average time of 1000 s. The proposed SPAC has an integrated, miniaturized and all-optical structure, which can be used for remote and long-distance trace gas detection.

scholarly journals Physical and Geometrical Properties of Additively Manufactured Pure Copper Samples Using a Green Laser Source

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3642
Author(s):  
Samira Gruber ◽  
Lukas Stepien ◽  
Elena López ◽  
Frank Brueckner ◽  
Christoph Leyens
Keyword(s):  
Electrical Conductivity ◽  
Eddy Current ◽  
Pure Copper ◽  
Current Method ◽  
Negative Influence ◽  
Green Laser ◽  
Laser Source ◽  
Eddy Current Method ◽  
Geometrical Properties ◽  
Laser Systems

So far, copper has been difficult to process via laser powder bed fusion due to low absorption with the frequently used laser systems in the infrared wavelength range. However, green laser systems have emerged recently and offer new opportunities in processing highly reflective materials like pure copper through higher absorptivity. In this study, pure copper powders from two suppliers were tested using the same machine parameter sets to investigate the influence of the powder properties on the material properties such as density, microstructure, and electrical conductivity. Samples of different wall thicknesses were investigated with the eddy-current method to analyze the influence of the sample thickness and surface quality on the measured electrical conductivity. The mechanical properties in three building directions were investigated and the geometrical accuracy of selected geometrical features was analyzed using a benchmark geometry. It could be shown that the generated parts have a relative density of above 99.95% and an electrical conductivity as high as 100% International Annealed Copper Standard (IACS) for both powders could be achieved. Furthermore, the negative influence of a rough surface on the measured eddy-current method was confirmed.

Interferometric signals in fiber optic methane sensors with wavelength modulation of the DFB laser source

1998 ◽  
Vol 16 (1) ◽  
pp. 43-53 ◽  
Author(s):  
G. Stewart ◽  
A. Mencaglia ◽  
W. Philp ◽  
Wei Jin
Keyword(s):  
Fiber Optic ◽  
Laser Source ◽  
Wavelength Modulation ◽  
Dfb Laser

High Speed 1.55 μm Lasers for Fiber Optic Transmission

1997 ◽  
Vol 08 (03) ◽  
pp. 457-474
Author(s):  
Paul A. Morton
Keyword(s):  
Active Region ◽  
High Speed ◽  
Carrier Transport ◽  
Multiple Quantum Well ◽  
Optical Filter ◽  
Essential Elements ◽  
Laser Source ◽  
Multiple Quantum ◽  
Modulation Bandwidth ◽  
Dfb Laser

This paper describes the essential elements for creating a practical wide bandwidth directly modulated laser source. This includes considerations of the intrinsic limitations of the laser structure, due to the resonant frequency and damping of the laser output, together with carrier transport issues to allow carriers in the device active region to be efficiently modulated at high speeds. The use of a P-doped compressively strained multiple-quantum well active region to provide high intrinsic speed and remove transport limitations is described, together with record setting results of 25 GHz modulation bandwidth for a 1.55 μm Fabry–Perot laser and 26 GHz bandwidth for a 1.55 μm DFB laser. The challenges of providing high bandwidth electrical connections to the laser on a suitable submount, together with fiber attachment and microwave packaging are discussed. Results of fully packaged 1.55 μm DFB laser with 25 GHz modulation bandwidth are shown. Digital modulation of the packaged 1.55 μm DFB including impedance matching is described, and the transient wavelength chirp is presented. This low chirp is reduced further using an optical filter, to provide a 10 GBit/s source that can transmit error free over 38.5 km of standard optical fiber.

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