Scribing blue LED wafer using laser-induced plasma-assisted ablation with a Q-switched Nd:YAG laser

2000 ◽  
Author(s):  
JongMoo Lee ◽  
Jun-Ho Jang ◽  
Tae-Kyung Yoo
Keyword(s):  
Nd:Yag Laser ◽  
Blue Led ◽  
Laser Induced Plasma

Laser-Induced Plasma Atomic and Ionic Emission During Target Ablation

2021 ◽  
Author(s):  
Nisreen Kh. Abdalameer ◽  
Sabah N. Mazhir
Keyword(s):  
Nd:Yag Laser ◽  
Plasma Parameter ◽  
Debye Length ◽  
Optical Emission ◽  
Solid Target ◽  
Plasma Parameters ◽  
Laser Induced Plasma ◽  
Repeat Rate ◽  
Ionic Emission ◽  
Debye Formula

This paper investigates the spectroscopy of plasma that resulted from the bombardment of ZnSe by using the optical emission spectroscopic (OES) technique. The plasma can be generated by the reaction between an Nd:YAG laser, with a wavelength of 1064[Formula: see text]nm with a repeat rate of 6[Formula: see text]Hz (as well as 9[Formula: see text]ns pulse duration), and a solid target, where the density of the electron (ne), the temperature of the electron ([Formula: see text]), the frequency of the plasma ([Formula: see text]) and the Debye length ([Formula: see text]) as plasma parameters, in addition to the particles’ number of Debye ([Formula: see text]) and plasma parameter ([Formula: see text]) have been calculated by picking up the spectrum of plasma at different energies (100, 200, 300, 400, 500) mj using Selenium (Se), Zinc (Zn) and the mixture (ZnSe) at ([Formula: see text]). It is found that the electron temperatures of Zn and Se ranged between (0.257–0.267)[Formula: see text]eV and (1.036–1.055) eV, respectively, while that of ZnSe ranged between (1.15–1.28)[Formula: see text]eV. This indicates that the electron temperature of ZnSe is higher than the temperatures of each Zn and Se.

Scribing and cutting a blue LED wafer using a Q-switched. Nd:YAG laser

2000 ◽  
Vol 70 (5) ◽  
pp. 561-564 ◽  
Author(s):  
J.-M. Lee ◽  
J.-H. Jang ◽  
T.-K. Yoo
Keyword(s):  
Nd:Yag Laser ◽  
Blue Led

scholarly journals Laser-Induced Plasma Measurements Using Nd:YAG Laser and Streak Camera: Timing Considerations

Atoms ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 6 ◽  
Author(s):  
Maja S. Rabasovic ◽  
Mihailo D. Rabasovic ◽  
Bratislav P. Marinkovic ◽  
Dragutin Sevic
Keyword(s):  
Nd:Yag Laser ◽  
Streak Camera ◽  
Signal Timing ◽  
Spectral Measurements ◽  
Camera System ◽  
Simple Modification ◽  
Laser Induced Plasma ◽  
Streak Image ◽  
Laser Signal ◽  
Plasma Measurements

We describe a streak camera system that is capable of both spatial and spectral measurements of laser-induced plasma. The system is based on a Hamamatsu C4334 streak camera and SpectraPro 2300i spectrograph. To improve the analysis of laser-induced plasma development, it is necessary to determine the timing of laser excitation in regard to the time scale on streak images. We present several methods to determine the laser signal timing on streak images—one uses the fast photodiode, and other techniques are based on the inclusion of the laser pulse directly on the streak image. A Nd:YAG laser (λ = 1064 nm, Quantel, Brilliant B) was employed as the excitation source. The problem of synchronization of the streak camera with the Q-switched Nd:YAG laser is also analyzed. A simple modification of the spectrograph enables easy switching between the spectral and spatial measurement modes.

scholarly journals Generation of custom acoustic harmonic bursts from spherical helmholtz resonators using Q-switched Nd:YAG laser induced plasma

2021 ◽  
Vol 53 (9) ◽  
Author(s):  
H. S. Ayoub ◽  
Ashraf F. El-Sherif ◽  
Diaa Ibrahim ◽  
M. Khairy ElTahlawy ◽  
Walid Gomaa ◽  
...  
Keyword(s):  
Nd:Yag Laser ◽  
Laser Induced Plasma ◽  
Helmholtz Resonators

Measurement of Concrete Strength Using the Emission Intensity Ratio between Ca(II) 396.8 nm and Ca(I) 422.6 nm in a Nd:YAG Laser-Induced Plasma

2006 ◽  
Vol 60 (1) ◽  
pp. 61-64 ◽  
Author(s):  
Kenichiro Tsuyuki ◽  
Satoru Miura ◽  
Nasrullah Idris ◽  
Koo Hendrik Kurniawan ◽  
Tjung Jie Lie ◽  
...  
Keyword(s):  
Nd:Yag Laser ◽  
Emission Intensity ◽  
Intensity Ratio ◽  
Concrete Strength ◽  
Laser Induced Plasma ◽  
Emission Intensity Ratio

Resonant semiconductor laser absorption of atomic Rb in a pulsed Nd:YAG laser-induced plasma

2019 ◽  
Vol 66 (16) ◽  
pp. 1717-1723
Author(s):  
Xiaoxu Zhang ◽  
Huiqi Zheng ◽  
Lili Ge ◽  
Hua Zhao ◽  
Qiongying Ren ◽  
...  
Keyword(s):  
Semiconductor Laser ◽  
Nd:Yag Laser ◽  
Pulsed Nd:Yag Laser ◽  
Laser Induced Plasma ◽  
Laser Absorption

scholarly journals Spectroscopic Diagnosis of the CdO:CoO Plasma Produced by Nd:YAG Laser

2021 ◽  
pp. 2948-2955
Author(s):  
Maryam M. Shehab ◽  
Kadhim A. Aadim
Keyword(s):  
Electron Temperature ◽  
Nd:Yag Laser ◽  
Laser Energy ◽  
Focal Length ◽  
Optical Emission ◽  
Ratio Method ◽  
Plasma Parameters ◽  
Optical Emission Spectrum ◽  
Boltzmann Plot ◽  
Laser Induced Plasma

      In this paper, the optical emission spectrum (OES) technique was used to analyze the spectrum resulting from the (CdO:CoO)  plasma in air, produced by Nd:YAG laser with λ=1064 nm, τ=10 ns, a focal length of 10 cm, and a range of energy of 200-500 mJ. We identified laser-induced plasma parameters such as electron temperature (Te) using Boltzmann plot method, density of electron (ne), length of Debye (λD), frequency of plasma (fp), and number of Debye (ND), using two-Line-Ratio method. At a mixing ratio of X= 0.5, the (CdO:CoO) plasma spectrum was recorded for different energies. The results of plasma parameters caused by laser showed that, with the increase in laser energy, the values of Te, ne and fp were increased, while the value of λD was decreased. The calculated electron temperature value was in the range of 0.449-0.619 eV at ratio X=0.5

Laser-Assisted Fabrication of Nanoparticles in Liquids and Their Application for Improving Analytical Performance of LIBS

2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940048
Author(s):  
N. Tarasenko ◽  
V. Kiris ◽  
N. Tarasenka ◽  
A. Nevar ◽  
M. Kuzmanovic ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Nd:Yag Laser ◽  
Glass Surface ◽  
Spectroscopic Analysis ◽  
Copper Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Distilled Water ◽  
Pulsed Nd:Yag Laser ◽  
Laser Induced Plasma ◽  
Laser Ablation In Liquids

Gold and copper oxide nanoparticles (NPs) were synthesized using pulsed Nd:YAG laser ablation in liquids (acetone and distilled water). The possibility of emission increasing from laser-induced plasma after the deposition of the prepared NPs on a glass surface promising for spectroscopic analysis of transparent samples was demonstrated.

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