scholarly journals Characterization of beam quality of unstable laser beams with the multiple hyperbolas method

2019 ◽  
Vol 12 ◽  
pp. 38-45 ◽  
Author(s):  
Lingqiang Meng ◽  
Qingqing Kong ◽  
Kunhao Ji ◽  
Zhigang Han ◽  
Hua Shen ◽  
...  
Keyword(s):  
Beam Quality ◽  
Laser Beams

Measurement and analysis of wavefront structures of diode lasers

2017 ◽  
Vol 84 (1) ◽  
Author(s):  
Inga-Maria Eichentopf ◽  
Martin Reufer
Keyword(s):  
Semiconductor Lasers ◽  
Near Infrared ◽  
Beam Quality ◽  
Laser Beams ◽  
Modal Composition ◽  
Wavefront Analysis ◽  
Measurement And Analysis ◽  
Laser Sources ◽  
Insight Into

AbstractIn order to analyze the beam quality of laser sources wavefront measurements using a Shack–Hartmann sensor became an established way. With the detection of the wavefront deflection a change of the modal composition of the laser beam can be recorded directly. While this method is well known for nearly Gaussian laser beams, the wavefront analysis of broadarea semiconductor lasers is an open field of current research. Detailed analysis of the wavefront gives an additional path to get an insight into the transverse modal composition of semiconductor lasers, which have a dominant impact on the output parameters of the devices. For the presented investigations lasers emitting light in the near infrared (

Characterization of beam quality of 10-kW class laser

2019 ◽  
Author(s):  
Przemyslaw Gontar ◽  
Lukasz Gorajek ◽  
Krzysztof Kopczynski ◽  
Jan K. Jabczynski
Keyword(s):  
Beam Quality

Study of evaluating nearfield beam quality of the high power laser beams

Optik ◽  
2018 ◽  
Vol 157 ◽  
pp. 148-155 ◽  
Author(s):  
Sensen Li ◽  
Pengyuan Du ◽  
Fan Wu ◽  
Lei Ding ◽  
Zhiwei Lu ◽  
...  
Keyword(s):  
High Power ◽  
Beam Quality ◽  
Laser Beams ◽  
High Power Laser ◽  
Power Laser

Effect of thermal blooming on the beam quality of truncated laser beams

Optik ◽  
2016 ◽  
Vol 127 (20) ◽  
pp. 8350-8356 ◽  
Author(s):  
Xiaoqing Li ◽  
Xiaoling Ji
Keyword(s):  
Beam Quality ◽  
Laser Beams ◽  
Thermal Blooming

scholarly journals Beam quality of annular pulsed laser beams propagating through the nonlinear and dispersive atmosphere

2021 ◽  
pp. 1-1
Author(s):  
Yu Deng ◽  
Xiaoling Ji ◽  
Xiaoqing Li ◽  
Huan Wang ◽  
Ziyue Huang ◽  
...  
Keyword(s):  
Beam Quality ◽  
Pulsed Laser ◽  
Laser Beams

Physicochemical and bacteriological characterization of hospital effluents and their impact on the environment

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Human Health ◽  
Fecal Coliforms ◽  
Chemical Pollution ◽  
Hospital Effluents ◽  
Biological Contaminants ◽  
Almost All ◽  
Direct Discharge ◽  
Significant Chemical

Liquid effluents discharged by hospitals may contain chemical and biological contaminants whose main source is the different substances used for the treatment of patients. This type of rejection can present a sanitary potentially dangerous risk for human health and can provoke a strong degradation of diverse environmental compartments mainly water and soils. The present study focuses on the quality of the liquid effluents of Hassani Abdelkader’s hospital of Sidi Bel-Abbes (West of Algeria). The results reveal a significant chemical pollution (COD: 879 mgO2/L, BOD5: 850 mgO2/L, NH4+ : 47.9 mg/l, NO2- : 4.2 mg/l, NO3- : 56.8 mg/l with respect to WHO standard of 90 mgO2/L, 30 mgO2/L, 0.5 mg/l, 1 mg/l and 1 mg/l respectively). However, these effluents are biodegradable since the ratio COD/BOD5 do not exceeded the value of 2 in almost all samples. The presence of pathogen germs is put into evidence such as pseudomonas, the clostridium, the staphylococcus, the fecal coliforms and fecal streptococcus. These results show that the direct discharge of these effluents constitutes a major threat to human health and the environment.

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