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Study Of Transient Thermal Effects In A Nd :Yag Laser Under

Di: Jacob

An experimental and theoretical study of the transient thermal effects of low‐energy multi‐pulse Nd:YAG laser on blood vessels is presented.comTransient thermal effect analysis and laser . A thermal analysis model is established by the ray-tracing software and finite element method.It provided a theoretical basis to solve the problem related to the thermal effect of the laser crystal and improve the laser output performance. Using an annular-shaped beam, a virtual solid-state laser with a cylindrical form was simulated in double-end pumping geometry.

Figure 1 from The effect of Nd concentration on 1064 and 946-nm ...

com[PDF] Thermal Lensing in a Nd:YAG Laser Rod.In this paper, the thermal and stress analyses of continuous and pulsed end-pumped Nd:YAG slab laser are studied using finite element method.Transient thermal model of temperature and stress field in solid-state microchip laser crystal was obtained analytically using integral transform method. Measurements using a 0.In this paper, transient thermal lensing effects in a typical flashlamp-pumped CTH:YAG laser crystal under lasing and non-lasing conditions are studie.Abstract In this work, we have presented a finite element (FE) numerical modelling simulations to study and analyze the thermal effects in Nd:YAG and composite YAG/Nd:YAG laser rods. The Nd:YAG laser crystal thermal model in this article could be widely applicable to similar laser crystals.Laser therapy has been widely used to treat port-wine stains (PWS) and other cutaneous vascular lesions via selective photothermolysis.6), the results demonstrate that a pump light with an .Background Recurrent aphthous stomatitis (RAS) is a common chronic inflammatory oral disease that negatively impacts the quality of life.

Operating principle diagram of the 0.5 mm Tm:YAG disk laser under (a ...

In the high power frequency-doubled Nd:YAG Laser, the temperature inside a nonlinear crystal will become non-uniform due to the absorbtion of the fundamental and second harmonic waves, leading to phase mismatch, conversion efficiency reduction and output power instability.Experimental study of thermal lensing ofNd:YAG laser.netThermal effect and laser characteristics of LD end . Included is a .

The transient thermal response of the beam to the laser pulse ...

In this study, transient thermal effects on liposome-injected vessels during irradiation of multi-pulse Nd:YAG laser were closely examined.This article explains the physical and biological effects of Er:YAG laser and introduces its applications in periodontal surgery including conventional flap surgery (open flap debridement), regenerative surgery, and flapless surgery, based on scientific evidence from currently available basic and clinical studies as well as cases reports.The results reveal that a Nd: YAG rod under pumped light becomes a positive lens with two focal lengths, and the temperature dependent variation of the refractive index constitutes the major contribution of the thermal lensing. Considering all events that occurred in this irradiation strategy, this section discusses formation mechanism of large vesicles in the blood.

Figure 1 from Thermal transient effects in repetitively pulsed ...

The thermal effects of the uniform .netComparative thermal analysis of Nd- and Yb-doped YAG . Here, pump-probe . Pumping solid state lasers with such sources yield high output pulse energies in spiking or Q-switched operation.Purpose: To objectively determine whether there is potential thermal tissue damage during Tm:YAG laser-based LUTS treatment. Study Design/Materials and Methods. HUShao-yun*, ZHONG Ming, ZUO Yan, and FAN Hong-ying.This paper presented an experimental and theoretical study of the transient thermal effects of low-energy multi-pulse Nd:YAG laser on blood vessels.A new slab configuration is designed based on the traditional Yb:YAG Total-Reflection Active-Mirror (TRAM) slab laser.To our knowledge, it is the first time to analyze the transient thermal effect of Tm: LuYAG crystal pumped by pulsed laser diode in detail.Diode lasers with peak powers in the kW range and pulse durations of micro- to milli-seconds have been available since several years. Laser therapy is currently the most effective way in clinical practice for PWS. As far as we know, this is .We develop a quasi-steady-state thermal model to analyze transient thermal effects in a Nd : YAG laser rod under quasi-continuous laser-diode (LD) end pumping.The thermal effect and Q-switching of flashlamp-pumped Cr, Tm, Ho: YAG (CTH: YAG) laser were investigated systematically. Ou and others published Simulation and experimental study on thermal effects of Nd:YAG lasers | Find, read and cite all the research you .An investigation of thermal effects in a high-power Nd:YAG disk-type solid state laser pumped with different pump beam transverse profiles is carried out by numerical simulation based on the finite element method (FEM).Thermal transport in semiconductor thin films deviates from conventional Brownian motion, exhibiting superdiffusive behaviour.The main task is to determine the temperature distribution in Nd:YAG laser rod, the subsequent value and location of maximum tensile hoop stress associated with the two types of the double end pumping for different ab .By compensating for the thermal lens effect in a Nd:YAG rod, we have substantially increased the fundamental transverse mode CW power available from the laser. Port wine stains (PWS) are congenital vascular malformations that progressively darken and thicken with age. Southwest Institute of Technical Physics, Chengclu 6~ 00 41, .Theoretical and experimental results are reported on the thermal lensing effect caused by the radial thermal gradient present in optically pumped Nd: YAG laser rods.The thermal effects of the diode end-pumped Nd:YVO4 slab laser crystal are investigated both analytically and numerically. According to the simulation parameters and results, a simplified . – ScienceDirectsciencedirect. In vivo experiments were performed on dorsal skin chamber. At a pump ratio of (0. The distribution of first principle stress .Semantic Scholar extracted view of Study on thermal effect and electro-optically Q-switching of Cr, Tm, Ho: YAG laser by Juntao Li et al. We have calculated the temperature distributions, stress intensity and thermal focal lengths at different pump powers for both rods. Animal models are a .comEmpfohlen auf der Grundlage der beliebten • Feedback Current therapies .Semantic Scholar extracted view of Thermal lens Q-switched 1064 nm Nd:YAG laser by Peijin Shang et al. The fraction of pump power dissipated as heat in flashlamp-pumped CTH: YAG laser system was evaluated for the first time by measurements and calculations on thermal lens effect. The results provide a method to analyze and evaluate bonding crystal thermal compensation .An investigation of thermal effects in a high-power Nd:YAG disk-type solid state laser pumped with different pump beam transverse profiles is carried out by .In this paper, transient thermal lensing effects in a typical flashlamp-pumped CTH:YAG laser crystal under lasing and non-lasing conditions are studied and compared in a low repetition-rate regime.orgEmpfohlen auf der Grundlage der beliebten • Feedback Methods: Our experimental model was comprised of a prostatic resection trainer placed in a 37 °C water bath.

Thermal Lens Effect Induced in a Cr,Tm,Ho:YAG Laser Rod

Impact of the heat sink on the thermal effects is included in the simulation.Laser therapy has been widely used to treat port-wine stain (PWS) and other cutaneous vascular lesions via selective photothermolysis.The present work aims to develop a model to mitigate the thermal lensing effects in laser diode-pumped solid-state laser systems. The presented theory is in agreement with the experimental observations.(PDF) Thermal lens and heat generation of Nd:YAG lasers .This paper presents a comparative analysis of laser wakefield acceleration (LWFA) generated by three different laser systems; Ti: Sapphire, Nd: YAG, and CO2 lasers, operating under identical conditions. The output energy is limited by the thermal lens effects, which are measured and calculated. Study design/materials and methods: In vivo . In a hollowed-out central area simulating the urethral lumen, we placed a RigiFib 800 fibre, irrigation inflow regulated . The theoretical model is established with considering the divergence of .The critical factors affecting the crystal transient temperature distribution are simulated and analyzed. Experimental measurements of these effects using a .We can see that the keyword burst has evolved from “nd/yag laser,” “sun exposure,” “photothermolysis,” “melanocortin 1 receptor,” to the current dimensional .The three-dimensional temperature field distribution of Nd:YAG ceramics pumped by the side of pulsed diode bar, the temperature field distribution in the process of repeated .The rate equations describing the dynamics of laser action are numerically solved simultaneously with the temperature conductivity heat equation to depict the .6328-pm probe beam yielded temperature distribution in and at .In this paper, the effects of laser heat input on the microstructures, tensile strength, and fatigue properties of Ti60 laser welded joints were investigated.We develop a quasi-steady-state thermal model to analyze transient thermal effects in a Nd :YAG laser rod under quasi-continuous laser-diode (LD) end pumping.

Thermal Effects in a Nd:YAG Laser

The grad-doping method is proposed to improve the pump uniformity of the gain medium.A theoretical model for the thermal lens and birefringent effects induced in a continuously pumped Nd:YAG rod is developed. By using a high speed camera (up to 2,000 fps), the complete and dynamic .Autor: Mina Babaei Bavil, Ebrahim Safari

Thermal effects in high-power Nd:YAG disk-type solid state laser

Request PDF | On Feb 1, 2002, Q.semanticscholar.We develop a quasi-steady-state thermal model to analyze transient thermal effects in a Nd :YAG laser rod under quasi-continuous laser-diode (LD) end . High incident laser fluence is always prohibited in clinic to prevent the thermal damage in normal skin tissue, leading to insufficient energy deposition on the target blood vessel and incomplete clearance of .net(PDF) Modeling of thermal lensing in a microchip Nd:YAG .Efficient compensation of thermally induced birefringence with thermal lensing in a rod geometry Nd:YAG laser amplifier was achieved by an in-cavity 90° polarization rotator with three sets of image .The clinical effects of the Nd:YAG laser operating in both the photodisruptive (Q-switched) and thermal (free-running, cw) modes are discussed, and their clinical applications investigated. The results reveal that a Nd:YAG rod under pumped light becomes a positive lens with two focal lengths.In this paper, transient thermal lensing effects in a typical flashlamp-pumped CTH:YAG laser crystal under lasing and non-lasing conditions are studied and .Thermal effects in a Nd:YAG laser rod, which is pumped continuously by tungsten iodine lamps, are described. Laser wakefield acceleration, a promising technique for compact particle acceleration, relies on the interaction of intense laser . This phenomenon appears severe in the high-power high-repetition rate .Analysis of the thermal effect in diode end-pumped Er:YAG .Article “Study of Transient Thermal Effects in a Nd :YAG Laser Under Quasi-Continuous Laser-Diode End Pumping” Detailed information of the J-GLOBAL is a service based .Investigating the temperature distribution inside the eye under the laser irradiation can be a useful tool to study and predict the thermal effects of laser radiation on the human eye and evaluate the risk involved in performing laser surgery.We have succeeded in bonding a Nd:YAG crystal and an anti-reflection coated diamond crystal to realize a composite laser which minimizes the Fresnel-reflection loss at the .In this paper, based on the iterative method of finite-difference, 3-D instantaneoos and stable temperature distribution of square slice in the Nd:YAG disk laser under super-Gaussian pump light .

Frontiers | Comparative ex vivo Investigations on the Cutting Quality ...

The FE simulations . The quasi-steady state and .