Experimental and numerical study of mechanism of glass modification process by continuous-wave laser backside irradiation (CW-LBI)

Itoh, Sho; Hidai, Hirofumi; Tokura, Hitoshi

doi:10.1007/s00339-012-7477-2

Cited by 14 publications

(7 citation statements)

References 12 publications

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“…The average propagation velocity V f is estimated to be 196 mm/s using these data. This V f is close to the value (∼200 mm/s) measured by Itoh et al [32].…”

Section: Fiber Fuse Calculation In Silica Glass At 0514 µMsupporting

confidence: 91%

“…This value is the same magnitude of the I th value observed in the fiber fuse experiments [50]. Therefore, it is considered that the migration of the bright spot observed by Hidai et al [29][30][31][32] occurs by the same mechanism as that of the fiber fuse phenomenon.…”

Section: Modified Zone Formed By Cw Laser Irradiationsupporting

confidence: 73%

“…The modification speed, which corresponds to the fiber fuse propagation velocity V f , was about 200 mm/s when the input laser power (P 0 ) was 10 W and increased with increasing P 0 [32]. The laser fluence at the focus, which corresponds to the threshold power density I th , was about 1 MW/cm 2 [31].…”

Section: Modified Zone Formed By Cw Laser Irradiationmentioning

confidence: 98%

“…Hidai et al observed the occurrence of periodic cavities in bulk glass by irradiation of a continuous-wave (CW) laser beam [29][30][31][32]. A schematic illustration of their experimental setup is shown in Figure 6.…”

Section: Modified Zone Formed By Cw Laser Irradiationmentioning

confidence: 99%

“…This phenomenon was discovered by British researchers in 1987-1988 in conventional single-mode optical fibers [24][25][26][27][28]. Recently, the occurrence of fiber fuse in bulk glasses [18,19,[29][30][31][32][33] has been reported. In this article, we describe the fiber fuse phenomenon observed in bulk glasses.…”

Section: Introductionmentioning

confidence: 96%

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Electron Density Estimation and Fiber Fuse Simulation in Laser-Irradiated Bulk Glass

Shuto¹

2022

JEEE

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To clarify the formation mechanism of periodic nanometer-size cavity structure of a borosilicate glass sample, the free electron density around the exit surface was investigated when it exposed to intense femtosecond laser radiation. The electron density near the edge of the crack on the surface was estimated to be 10 20 -10 22 cm -3 . From this result, the temperature of the irradiated heating area near the edge of the crack was estimated to reach at least about 6,000 K, which was sufficient for the initiation and propagation of the fiber fuse. In this way, periodic nanosized cavities could be formed by fiber fuse propagation starting near the edge of the crack on the exit surface. Next, fiber fuse propagation in the modified zone formed by continuous-wave laser irradiation in a silica glass sample was investigated theoretically by the explicit finite-difference method using the thermochemical SiO x production model. In the calculation, we assumed the glass to be in an atmosphere and that part (40 µm in length) of the modified zone was heated to a temperature of 2,923 K. The calculated velocities of fiber fuse propagation in the modified zone were in fair agreement with the experimental values observed at 0.514 and 1.064 µm.

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“…The average propagation velocity V f is estimated to be 196 mm/s using these data. This V f is close to the value (∼200 mm/s) measured by Itoh et al [32].…”

Section: Fiber Fuse Calculation In Silica Glass At 0514 µMsupporting

confidence: 91%