Ultrafast Radiation Heat Transfer in Laser Tissue Welding and Soldering

Kim, Kyunghan; Guo, Zhixiong

doi:10.1080/10407780490457365

Cited by 90 publications

(78 citation statements)

References 25 publications

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Section: Introductionmentioning

confidence: 99%

“…Laser-based material processing on a microscale has been used in thermal processing, shock peening, surface treatment, cleaning of surfaces, welding, melting and polishing, scribing, as well as micromachining of basic geometric features on a variety of materials [1][2][3][4][5][6][7][8][9][10][11][12].Lasers are usually categorized as two groups: continuous wave (cw) and pulsed lasers. Conventional cw and pulsed laser irradiation and ablation is used in many fields, such as material processing, machining, etching, deposition, sintering, micro-fluidics, medical, and many other applications [13][14][15][16][17][18][19].…”

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confidence: 99%

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Micro‐Laser Processing

Özel²

2011

Micro‐Manufacturing

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INTRODUCTIONThe use of laser technology in the processing of materials for micro-products has been reported over the last decade. Laser-based material processing on a microscale has been used in thermal processing, shock peening, surface treatment, cleaning of surfaces, welding, melting and polishing, scribing, as well as micromachining of basic geometric features on a variety of materials [1][2][3][4][5][6][7][8][9][10][11][12].Lasers are usually categorized as two groups: continuous wave (cw) and pulsed lasers. Conventional cw and pulsed laser irradiation and ablation is used in many fields, such as material processing, machining, etching, deposition, sintering, micro-fluidics, medical, and many other applications [13][14][15][16][17][18][19].The use of lasers in micro-manufacturing is closely connected to the characteristics of the laser. The main laser parameters to be chosen and controlled are wavelength, λ (nm); average power (W) or energy (J); intensity (W/m 2 ) or fluence, ( ) (J/m 2 ); pulse duration, τ (s); pulse repetition rates (Hz); and peak power (pulse energy/pulse duration) [9,11,16,20,21].Pulsed lasers achieve much higher intensities than cw lasers and are the preferred solution for the fabrication of micro-sized structures. Long-pulsed (nanosecond, ns), short-pulsed (picoseconds, ps), and ultrashort-pulsed (femtosecond, fs) lasers that are commonly used for repairing, trimming, marking, scribing, texturing, welding, ablation, cutting, and drilling include among others (i) Excimer lasers with ultraviolet (UV) wavelengths, (ii) Ti:sapphire lasers Micro-Manufacturing: Design and Manufacturing of Micro-Products, First Edition. Edited by Muammer Koç and TugrulÖzel.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Micro‐Laser Processing

Özel²

2011

Micro‐Manufacturing

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“…Once the intensity field is obtained, the incident radiation is calculated as (Kim & Guo, 2004;Kumar, 2001) = =1 + (2) The incident radiation is the total intensity impinging on a point from all 0 ballistic laser irradiance .The radiation intensity has two components: the ballisticcomponent accounting for the incident laser beam and the diffuse component standing for the scattering component of the laser beam. The ballistic component of a laser beam is expressed as (Jian Jiao & Guo, 2009;Kim & Guo, 2004).…”

Section: Time-dependent Equation Of Radiative Transfer (Ert)mentioning

confidence: 99%

“…The laser beam radiation heat transfer is described by the timedependent ERT in the cylindrical coordinate system as where , , are the three directional cosines for the discrete direction is the radiative source term (the superscript is the index of discrete directions), c is the speed of light in medium, I is the radiation intensity, is the extinction coefficient that is the sum of the absorption coefficient and the scattering coefficient , t is the time (Kim & Guo, 2004).…”

Section: Time-dependent Equation Of Radiative Transfer (Ert)mentioning

confidence: 99%

Dynamical study on the ultra-short pulsed laser in the water medium and skin tissue and comparing obtained results

Hoseinimotlagh¹

2014

IJFPS

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Interest on the ultra-short laser has increased continually over the past decade. Scientists have an excellent power medical resource and the use of this resource will assist in the development of sustainable medical procedures. Scientists with its many technologies and significant medical range-might be expected to have considerable potential for treatment skin cancer. In this paper influences of the critical electron density and radiation intensity on the free-electron density for the ablation on the epidermis and dermis tissues are investigated. Our research work show existing of an inverse relationship between intensity radiations of laser pulsed and distance of focal spot with time dependent of free-electron density. This case is proper for skin cancer treatment. Also, our calculations for each medium (water and skin tissue)show that optimum time dependent free electron density for dermis layer at angle 16˚ and 22˚ which is a function of wavelength, beam width, beam radius, amplitude of the beam radiation strength and pulse duration is more than for epidermis layer.

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“…These phenomena occur in a variety of realms (Ahmad & Deering, 1992;Tsai & Ozişik, 1989;Wilson & Sen, 1986;Yi et al, 1996) including optics (Liu et al, 2006), astrophysics (Pinte et al, 2009), atmospheric science (Thomas & Stamnes, 2002), remote sensing (Shabanov et al, 2007) and engineering applications like heat transport by radiation (Brewster, 1992) for instance or radiative transfer laser applications (Kim & Guo, 2004). Furthermore, applications to other media such as biological tissue, powders, paints among others may be found in the literature (see ref.…”

Section: Introductionmentioning

confidence: 99%