Comparison between two active media Nd: YAG and Nd: YVO4 rods inside a cavity for producing a high-power 808nm diode end-pumping laser system

El-Sherif, Ashraf F.; Hussein, Khalid I.; Hassan, Mohamed M.; Talat, Mahmoud M.

doi:10.1117/12.902906

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…In this case, higher output is obtained when Nd:YVO 4 is used as the gain medium rather than Nd:YAG. 18,19 Nd:YVO 4 has an absorption rate of 808 nm that is five times higher than Nd:YAG, which is able to extends double the lifetime of the diode laser. As the single axis crystal with large double refraction, it is possible to obtain a linearly polarized beam without a polarization device by using Nd:YVO 4 having the property of emitting a linearly polarized beam.…”

Section: Laser System Development Minimally Invasive Laser Systemmentioning

confidence: 99%

Development of a Minimally Invasive and Non-invasive Lipolysis Laser System for Effective Fat Reduction

Lee

Ryu

et al. 2021

J Lasers Med Sci

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Introduction: Obesity is a global problem because it causes various complications. Methods for reducing fat for healthy life are being studied. In this study, we developed a minimally invasive and non-invasive lipolysis laser system for effective fat reduction. Methods: The laser had the wavelengths of 1980 nm and 2300 nm which have very good absorption of fat and water. We developed a minimally invasive laser system that breaks down fat by direct irradiation of fat tissue. This minimally invasive laser system uses a 808 nm diode laser and Nd:YVO4 to generate the 1064 nm wavelength, which is the pumping source of the nonlinear crystals. It is a mid-infrared lipolysis laser system having two wavelengths of 1980 nm and 2300 nm by controlling the temperature of nonlinear crystals. We also developed a non-invasive laser system that reduces fat with hyperthermia treatment by raising the temperature of adipocytes with a 1060 nm penetrating depth into the skin. In this non-invasive laser system, the In gallium arsenide (GaAs) diode laser is irradiated on the skin with an area of 4 × 8 cm2 through the hand-piece. The cooling system in the hand-piece protects the skin from burns. We studied the effectiveness and safety of each system through animal experiment. We studied the effects of lipolysis when these two systems were combined. Results: This research uses new wavelengths (1980 nm, 2300 nm) to increase the fat reduction effect with low energy (1.3 W). After using the 1060 nm (1.1 W/cm2 ) wavelength laser, when the 1980 nm and 2300 nm (1.3 W) laser were used, a lipolysis effect of about 35 % was obtained. Conclusion: We have developed a 1.3 W mid-infrared (1980 nm, 2300 nm) laser with good lipolysis effect with low power.

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Section: Laser System Development Minimally Invasive Laser Systemmentioning

confidence: 99%

Development of a Minimally Invasive and Non-invasive Lipolysis Laser System for Effective Fat Reduction

Lee

Ryu

et al. 2021

J Lasers Med Sci

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“…Choosing the right cutting method and then its appropriate application to shape a specific type of material is a difficult task. This is due to the necessity of the correct selection of technological parameters of the process and their control during the process, so as to obtain a product of appropriate technological quality [6][7][8][9]. Each of the cutting technologies is currently being developed to achieve greater efficiency and accuracy.…”

Section: Introductionmentioning

confidence: 99%

Effect of fiber and CO2 lasers parameters on the cut surface quality of RVS 1.4301 stainless steel

Bohdal

Schmidtke

2022

JMES

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The paper presents the results of experimental research related to the process of cutting of t = 3 mm and t = 6 mm thick RVS 1.4301 (AISI 304, EN X5CrNi18-10) stainless steel using a fiber and CO2 lasers. The correct selection of technological parameters and the maintenance of the machines in the right technical condition allow obtaining very high quality of the cut edge, which will not require additional mechanical treatment. However, this is a complex issue. Appropriate control of the cutting process requires knowledge about the impact of individual parameters on the process and the quality of the cut edge. The influence of selected parameters and conditions of the laser cutting process on the technological quality of the obtained product was determined. The laser power and cutting speed had a significant influence on the output factors for two cutting techniques.For cutting material with a thickness of t = 3 mm with a CO2 laser, the highest quality of the cut edge was obtained using the power values P = 4200-4300 W and cutting speed v = 2100 mm/min. For the thickness t = 6 mm, the speed values should be approximately set in range v = 1600-1800 mm/min. The power value should be selected in a range from P = 3700 W to P = 4200 W. For a fiber laser with a material thickness of t = 3 mm, the best results were obtained using speeds in the range v = 2000-3300 mm/min. For the thickness of t = 6 mm, the cutting speed must be higher and in the range v = 3500-4000 mm/min while maintaining the power of about P = 4500-4800 W. The conducted experimental research can be useful on production lines in the aspect of the correct selection of technological parameters of the process due to the adopted energy and quality criteria.

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Comparison between two active media Nd: YAG and Nd: YVO4 rods inside a cavity for producing a high-power 808nm diode end-pumping laser system

Cited by 2 publications

References 2 publications

Development of a Minimally Invasive and Non-invasive Lipolysis Laser System for Effective Fat Reduction

Development of a Minimally Invasive and Non-invasive Lipolysis Laser System for Effective Fat Reduction

Effect of fiber and CO2 lasers parameters on the cut surface quality of RVS 1.4301 stainless steel

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