scholarly journals Sub-nanosecond laser induced air-breakdown with giant-pulse duration tuned Nd:YAG ceramic micro-laser by cavity-length control

2017 ◽  
Vol 25 (6) ◽  
pp. 6302 ◽  
Author(s):  
Hwan Hong Lim ◽  
Takunori Taira
Keyword(s):  
Pulse Duration ◽  
Cavity Length ◽  
Nanosecond Laser ◽  
Giant Pulse ◽  
Air Breakdown

Control of giant pulse duration in neodymium minilasers with controllable cavity length and pulsed pumping

2006 ◽  
Vol 45 (20) ◽  
pp. 4972
Author(s):  
Vladimir A. Berenberg ◽  
Miguel A. Cervantes ◽  
Vladimir S. Terpugov
Keyword(s):  
Pulse Duration ◽  
Cavity Length ◽  
Giant Pulse ◽  
Pulsed Pumping

Pulse Duration of a Mode-Locked Nd–Glass Laser Varying the Cavity Length and the Dye Transmission

1972 ◽  
Vol 50 (4) ◽  
pp. 407-409
Author(s):  
G. L. Busca ◽  
M. Bergeron
Keyword(s):  
Pulse Duration ◽  
Experimental Error ◽  
Cavity Length ◽  
Glass Laser ◽  
Light Pulses ◽  
Constant Duration

A recently introduced technique, the ultrahigh-speed photography of ps light pulses, was used to study the dependence of the pulse duration of a passively Q-switched Nd +3–glass laser on the cavity length and the dye transmission. A constant duration, within the experimental error, was found.

scholarly journals Laser-induced ablation of tantalum in a wide range of pulse durations

2020 ◽  
Vol 126 (9) ◽  
Author(s):  
Steffen Mittelmann ◽  
Jannis Oelmann ◽  
Sebastijan Brezinsek ◽  
Ding Wu ◽  
Hongbin Ding ◽  
...  
Keyword(s):  
Confocal Microscopy ◽  
Laser Pulse ◽  
Femtosecond Laser ◽  
Pulse Duration ◽  
Laser Fluence ◽  
Crater Depth ◽  
Nanosecond Laser ◽  
Threshold Fluence ◽  
Wide Range ◽  
Laser Systems

Abstract We present data and analysis of the laser-induced ablation of pure tantalum (Ta, $$Z=73$$ Z = 73 ). We have identified different physical regimes using a wide range of laser pulse durations. A comparison of the influence of strongly varying laser pulse parameters on high-Z materials is presented. The crater depth caused by three different laser systems of pulse duration $${\varDelta }\tau _1=5\,\mathrm {ns}$$ Δ τ 1 = 5 ns and wavelength $$\lambda _1=1064\,\mathrm {nm}$$ λ 1 = 1064 nm , $${\varDelta }\tau _2=35\,\mathrm {ps}$$ Δ τ 2 = 35 ps , $$\lambda _2=355\,\mathrm {nm}$$ λ 2 = 355 nm and $${\varDelta }\tau _3=8.5\,\mathrm {fs}$$ Δ τ 3 = 8.5 fs , $$\lambda _3=790\,\mathrm {nm}$$ λ 3 = 790 nm are analyzed via confocal microscopy as a function of laser fluence and intensity. The minimum laser fluence needed for ablation, called threshold fluence, decreases with shorter pulse duration from $$1.10\,\mathrm {J/cm}^2$$ 1.10 J / cm 2 for the nanosecond laser to $$0.17\,\mathrm {J/cm}^2$$ 0.17 J / cm 2 for the femtosecond laser.

scholarly journals DURATION LIMIT OF LASER PULSES EMITTED FROM A Ce-DOPED CRYSTAL SHORT CAVITY

2017 ◽  
Vol 24 (1&2) ◽  
pp. 177-183
Author(s):  
Le Hoang Hai ◽  
Nguyen Dai Hung ◽  
Hoang Huu Hoa ◽  
Alex V. V. Quema ◽  
Nobuhiko Sarukura
Keyword(s):  
Pulse Duration ◽  
Significant Influence ◽  
Pulse Width ◽  
Cavity Length ◽  
Laser Pulses ◽  
Gain Medium ◽  
Pulse Operation ◽  
Picosecond Pulses ◽  
Mirror Reflectivity ◽  
Direct Generation

Based on the rate equation set for broadband cavities, the dependence of pulse duration on cavity and pumping parameters is analyzed. The cavity uses a Ce-doped crystal as a gain medium. Computation results show the variation of the pulse width with the change of cavity length, mirror reflectivity, pumping energy and pumping pulse duration. A significant influence of multiple-pulse operation in limiting pulse duration is realized and a pulse-width of the order 200 ps is found to be the limit for the direct generation of ultraviolet single picosecond pulses from a Ce:LLF short cavity.

Adjustment of the nanosecond laser pulse duration by using a carbon nanotube suspension

2010 ◽  
Vol 53 (6) ◽  
pp. 849-852
Author(s):  
G. M. Mikheev ◽  
V. V. Vanyukov ◽  
T. N. Mogileva ◽  
A. V. Okotrub
Keyword(s):  
Carbon Nanotube ◽  
Laser Pulse ◽  
Pulse Duration ◽  
Laser Pulse Duration ◽  
Nanosecond Laser Pulse ◽  
Nanosecond Laser

Pulse duration adjusted by changing the cavity length with a multi-pass cavity in a Q-switched Nd:YAG laser

2019 ◽  
Vol 44 (18) ◽  
pp. 4471 ◽  
Author(s):  
Yan-Jie Song ◽  
Ke Liu ◽  
Nan Zong ◽  
Wei Tu ◽  
Yong Bo ◽  
...  
Keyword(s):  
Pulse Duration ◽  
Nd:Yag Laser ◽  
Cavity Length

Nanosecond and sub-nanosecond laser-assisted microscribing of Cu thin films in a salt solution

2021 ◽  
pp. 251659842110081
Author(s):  
Sooraj Shiby ◽  
Nilesh J Vasa ◽  
Matsuo Shigeki
Keyword(s):  
Laser Pulse ◽  
Pulse Duration ◽  
Salt Solution ◽  
Pulse Width ◽  
Material Removal ◽  
Pulsed Laser ◽  
Laser Pulse Duration ◽  
Nanosecond Laser ◽  
Channel Depth ◽  
Cu Film

Pulsed laser-based material removal is a preferred technique for microscribing of copper (Cu) film coated on polymers, as the pulse width limits the heat diffusion. However, experimental studies have shown that microscribing of Cu in air results in recast/redeposit formation and oxidation. Although the water medium can reduce these effects to a certain extent, the material removal rate is lesser for Cu. This article reports the influence of laser pulse duration on a hybrid method to enhance the pulsed laser-assisted microscribing of a copper thin film in the presence of an environmentally friendly sodium chloride salt solution (NaCl). The focused laser beam irradiation of Cu film results in ablation with a temperature of the zone well above the boiling point of Cu, which in turn, can assist in accelerating the chemical reaction. In this hybrid scribing technique, along with laser-based material removal, laser-activated chemical etching also helps in removing the material selectively. A sub-nanosecond laser with a pulse width of 500 ps (picosecond [ps] laser) and a nanosecond laser with a pulse width of 6 ns (nanosecond [ns] laser), with a wavelength of 532 nm, are used to understand the influence of laser pulse duration on this hybrid material removal mechanism. Hybrid microscribing with the ps- and ns lasers in salt solution resulted in an increase in the channel depth by ≈5 µm and ≈9 µm, respectively, compared to the channel depth obtained in deionized water. The theoretical model shows that during the ns laser ablation, the cooling rate is slower, resulting in a high temperature in the ablation zone for a longer duration and improved material removal.

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