Neodymium glass laser with a pulse energy of 220 J and a pulse repetition rate of 0.02 Hz

2013 ◽  
Vol 43 (7) ◽  
pp. 597-599 ◽  
Author(s):  
A A Kuzmin ◽  
O V Kulagin ◽  
Efim A Khazanov ◽  
A A Shaykin
Keyword(s):  
Pulse Energy ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Pulse Repetition ◽  
Glass Laser ◽  
Neodymium Glass

In vitro study of cataract extraction by bursts of microsecond 1.54-mm laser pulses

2022 ◽  
Vol 52 (1) ◽  
pp. 69-77
Author(s):  
A V Belikov ◽  
S N Smirnov ◽  
Yu N Batov ◽  
A B Gubin ◽  
Yu B Pirozhkov ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Video Recording ◽  
Average Power ◽  
Cataract Extraction ◽  
Pulse Repetition ◽  
Glass Laser ◽  
First Time ◽  
Pulse Spacing

Abstract Laser extraction of a model porcine eye cataract has been performed for the first time in an in vitro experiment using a 1.54-μm Yb,Er : glass laser generating bursts of microsecond pulses. We used effective pulse repetition rates from 36 to 75 Hz and average laser output powers from 3.9 to 5.25 W. The results demonstrate for the first time that, at an effective pulse repetition rate of 45 Hz, burst repetition rate of 15 Hz, three microsecond pulses per burst, and a burst energy from 260 to 265 mJ, the laser step duration in cataract extraction is 130 plusmn; 10 s, which is comparable to the ultrasonic phacoemulsification and laser extraction time in the case of a Nd : YAG laser emitting at 1.44 μm. Acoustometry and high speed video recording of hydroacoustic processes accompanying interaction of water with 1.54-μm radiation from the Yb, Er : glass laser generating bursts of microsecond pulses have made it possible for the first time to detect overlap of hydroacoustic processes at the pulse spacing in bursts reduced to under 700 μs. In the case of overlap of hydroacoustic processes, despite the increase in average power and effective pulse repetition rate, acoustic wave generation is ineffective because pulses propagate through bubbles formed in the water. Laser cataract extraction is shown to be most effective at a lower average power, lower effective pulse repetition rate, and burst pulse spacing of 850 ± 10 μs.

scholarly journals Surface characterization of laser-induced molten area in micro-grooving of silicon by ultraviolet (UV) laser

2021 ◽  
Vol 2051 (1) ◽  
pp. 012003
Author(s):  
N S A Raman ◽  
I H W Nordin ◽  
M S A Majid ◽  
Z M Razlan ◽  
S S C Abdullah
Keyword(s):  
Laser Pulse ◽  
Pulse Energy ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Laser Pulse Energy ◽  
Scanning Speed ◽  
Pulse Repetition ◽  
Irradiation Condition ◽  
Uv Laser ◽  
High Pulse

Abstract The objective of this research is to understand the fundamental mechanisms that govern the formation of laser-induced molten area during the micro-grooved fabrication on silicon material. In this research work, micro grooves were fabricated on silicon wafer by using ultraviolet (UV) laser of 248nm wavelength. Influence of lasing parameters such as pulse duration, laser pulse energy and scanning speed on the surface of micro-grooved was characterized. It is found that, the width of the micro grooves become wider with increasing laser pulse energy when ultraviolet laser was irradiated on silicon material. On the other hand, heat affected zone (HAZ) can be found at the surface of micro groove line at high pulse energy, high pulse repetition rate and lower scanning speed irradiation condition. This is considered due to the excessive heat input of the laser irradiation condition. It is concluded that proper selection of laser processing parameters of pulse energy, E, pulse repetition rate, R p , and scanning speed is necessary to achieve high quality micro-grooves.

Laser Cutting Characteristic on the Laminated Carbon Fiber Reinforced Plastics (CFRP) Composite of Aerospace Structure Panel

2012 ◽  
Vol 576 ◽  
pp. 503-506 ◽  
Author(s):  
Md. Saidin Wahab ◽  
E.A. Rahim ◽  
N.A. Rahman ◽  
M.F. Uyub
Keyword(s):  
Carbon Fiber ◽  
Pulse Energy ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
High Performance ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Pulse Repetition ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced

Carbon fiber reinforced plastic (CFRP) composites as high performance material in aerospace industry. The application of laser technology to cut the CFRP shows promising advantages. Therefore, several cutting parameters such as pulse energy, pulse repetition rate, cutting speed and pulse duration need to be taken into consideration. In this study, the effect of the aforementioned parameters on heat affected zone (HAZ), kerf width and taper angle were evaluated. The results showed that pulse energy and pulse repetition rate gave a significant effect on the cutting characteristic.

scholarly journals Adaptive Nonlinear Phase Compensation in a Femtosecond Hybrid Laser with Varying Pulse Repetition Rate

Photonics ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 387
Author(s):  
Luka Černe ◽  
Jaka Petelin ◽  
Rok Petkovšek
Keyword(s):  
Solid State ◽  
Laser Pulse ◽  
Pulse Duration ◽  
Pulse Energy ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Pulse Repetition ◽  
Strehl Ratio ◽  
Pulse Parameters ◽  
Nonlinear Phase

In this manuscript, an implementation of a tunable nonlinear phase compensation method is demonstrated on a typical femtosecond hybrid laser consisting of a fiber pre-amplifier and an additional solid-state amplifier. This enables one to achieve constant laser pulse parameters over a wide range of pulse repetition rates in such a laser. As the gain in the solid-state amplifier is inversely proportional to the input power, the shortfall in the solid-state gain at higher repetition rates must be compensated for with fiber pre-amplifier to ensure constant pulse energy. This increases the accumulated nonlinear phase and consequently alters the laser pulse parameters such as pulse duration and Strehl ratio. To overcome this issue, the nonlinear phase must be compensated for, and what is more it should be compensated for to a different extent at different pulse repetition rates. This is achieved with a tunable CFBG, used also as a pulse stretcher. Using this concept, we demonstrate that constant laser pulse parameters such as pulse energy, pulse duration and Strehl ratio can be achieved in a hybrid laser regardless of the pulse repetition rate.

The Effect of Laser Cutting Parameters on the Aerospace Structure Panel of CFRP Composite Material

2012 ◽  
Vol 225 ◽  
pp. 127-131 ◽  
Author(s):  
Wahab Saidin ◽  
Erween Abdul Rahim ◽  
Mohd Sukri Mustafa ◽  
Norzaina Abdul Rahman
Keyword(s):  
Carbon Fiber ◽  
Pulse Energy ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Laser Cutting ◽  
Cutting Parameters ◽  
Kerf Width ◽  
Pulse Repetition ◽  
Taper Angle ◽  
Aerospace Structure

This paper presents a research progress on the laser cutting characteristic of the carbon fiber reinforced plastic (CFRP) composites material for the aerospace structure panel. The CFRP is a high performance material and become one of the most important materials in the aerospace industry. The current machining techniques used by the aerospace composites manufacturing for cutting and trimming process have created some quality issues such as fiber pulled out and delamination. The use of laser cutting technology has shows promising advantages. However, the Laser cutting represents the interaction between laser beam and the CFRP composites, that produce heat affected zone (HAZ), kerf width and taper angle. Thermal damage is a direct consequence of the large difference in thermal properties of the carbon fiber and the polymer matrix. Therefore, the effect of laser cutting parameters such as pulse energy, pulse repetition rate, cutting speed and pulse duration need to be taken into consideration. A 300W Pulsed Nd:YAG laser machine was used in the experiment and successfully cut or trim the 1.5mm thickness of the CFRP component. The results also showed that the pulse energy and pulse repetition rate gave the most significant effect on the cutting characteristic in particular of kerf width, HAZ and taper angle.

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