共查询到20条相似文献,搜索用时 15 毫秒
1.
X. Ding Y. Yasui Y. Kawaguchi H. Niino A. Yabe 《Applied Physics A: Materials Science & Processing》2002,75(3):437-440
The laser-induced back-side wet etching of fused silica with aqueous solutions of pyranine (8-hydroxy-1,3,6-pyrenetrisulfonic
acid trisodium salt) is reported. KrF and XeF excimer lasers were employed as light sources. Well-defined line-and-space and
grid micropatterns, free of debris and microcracks, were obtained. Compared with other organic solutions, the aqueous pyranine
etching medium etches more slowly but produces a higher quality etched surface. With the KrF laser, the etch rate ranged from
0.02 to 0.12 nm pulse-1, depending on the dye concentration and the fluence of the laser. The etch rate decreased dramatically when the XeF laser
was employed, which was partially attributed to the lower absorption efficiency of the aqueous pyranine solution at the XeF
laser wavelength.
Received: 20 November 2001 / Accepted: 21 November 2001 / Published online: 2 May 2002 相似文献
2.
H. Mizoguchi A. Endoh J. Jethwa B. Rácz F. P. Schäfer 《Applied physics. B, Lasers and optics》1991,52(3):195-199
A wide aperture X-ray preionized discharge-pumped KrF excimer laser has been constructed. A flat plate pulse-forming line (36 nF, 340 kV) charges a peaking capacitor (6 nF) through a rail-gap to facilitate a rapid discharge in the laser head. Collimated X-ray preionization is employed to obtain a wide and uniform discharge. The laser is intended to be used as a short pulse amplifier and results are presented when characterized as an oscillator. The active cross-section of the laser beam is 10×8 cm2 with 50 cm effective electrode length. The laser pulse energy exceeds 4.7 J in a 28 ns pulse (FWHM). 相似文献
3.
Kenzo Miyazaki Toru Fukatsu Ichiro Yamashita Toshifumi Hasama Kawakatsu Yamada Takuzo Sato 《Applied physics. B, Lasers and optics》1991,52(1):1-7
Improvements in output pulse energy and efficiency of a conventional capacitor-transfer-type discharge excimer laser with automatic preionization have been achieved by extending the discharge volume and resulting moderate pumping of the active medium. The discharge laser produces a pulse energy of more than 1 J for XeCl, KrF, and ArF lasers in square beams of about 2×2 cm2, and the maximum overall efficiency observed is 2.9% for XeCl, 3.2% for KrF and 1.8% for ArF. The laser device has been involved in a picosecond ( 32 ps) XeCl laser amplification system, and was operated as an amplifier at a repetitive frequency of 10 Hz. Saturation fluence for XeCl laser was measured to be 1.4 mJ/cm2, and the picosecond pulse energy of 40 mJ was extracted from the amplifier.On leave from Ebara Corp., 6-6-7, Ginza, Chuo-ku, Tokyo 104, JapanOn leave from Mitsubishi Heavy Industries, LTD., 4-6-22, Kan-on shinmachi, Nishi-ku, Hiroshima 733, Japan 相似文献
4.
The influence of preionization conditions on the performance of a XeCl gas discharge laser preionized by a short, high intensity x-ray pulse, has been studied. The laser output energy and optical pulse temporal characteristics have been used to determine the roles of initial electron density and of electron attachment to HCl and to impurities. Although the short pulse preionization technique functions well for XeCl when the laser voltage pulse has a short risetime (?20 ns), it is less well suited to XeCl lasers using slowly rising voltage pulses (>50 ns), or to F2 containing gas mixtures (KrF and XeF lasers). 相似文献
5.
E. Takahashi S. Kato Y. Matsumoto I. Okuda 《Applied physics. B, Lasers and optics》2010,98(2-3):501-505
External-laser-induced preionization of excimer lasers was investigated. A discharge XeF laser was preionized by two different UV lasers [a KrF laser (λ=249 nm) and an ArF laser (λ=193 nm)], and the improvements in performance of the XeF laser were compared. The XeF laser beam profiles were measured by an intensified CCD (ICCD) camera with temporal resolution of 10 ns. Striated XeF laser profiles were obtained with 249 nm laser preionization, whereas there was no striation in the profiles for 193 nm laser preionization. These striations originated from discharge in the XeF laser induced by laser preionization. The influence of excited rare-gas atoms on the discharge instability was examined. 相似文献
6.
A wide aperture, X-ray pre-ionized discharge pumped excimer laser was comparatively studied as oscillator and amplifier with XeCl and KrF as the active gases. With XeCl (KrF), an oscillator output energy of 3J (1 J) and a small-signal gain coefficient of 11%cm–1 (6%cm–1) were measured. The beam size was 6×5 cm2. For smaller beam widths (obtained by limiting the pre-ionized region), both excimers showed considerably higher gain. The dependence of output parameters on the X-ray dose was studied for both excimers. 相似文献
7.
8.
J. Zhang K. Sugioka T. Takahashi K. Toyoda K. Midorikawa 《Applied Physics A: Materials Science & Processing》2000,71(1):23-26
A new technique of dual-beam laser ablation of fused silica by multiwavelength excitation process using a 248-nm KrF excimer laser (ablation beam) coupled with a 157-nm F2 laser (excitation beam) in dry nitrogen atmosphere is reported. The dual-beam laser ablation greatly reduced debris deposition and, thus, significantly improved the ablation quality compared with single-beam ablation of the KrF laser. High-quality ablation can be achieved at the delay times of KrF excimer laser irradiation shorter than 10 ns due to a large excited-state absorption. The ablation rate can reach up to 80 nm/pulse at the fluence of 4.0 J/cm2 for the 248-nm laser and 60 mJ/cm2 for the F2 laser. The ablation threshold and effective absorption coefficient of KrF excimer laser are estimated to be 1.4 J/cm2 and 1.2᎒5 cm-1, respectively. 相似文献
9.
10.
Subpicosecond pulse amplification at the 351 nm line of XeF is reported. The study of the gain dynamics of XeF with subpicosecond (subnanosecond) pulses resulted in 0.2 mJ/cm2 (0.8 mJ/cm2) for the saturation energy density and 0.18 cm–1 (0.21 cm–1) for the small-signal-gain coefficient. In XeF a gain recovery of 78±4% with a 79±18 ps time constant is found. 相似文献
11.
E. Takahashi S. Kato I. Okuda Y. Matsumoto 《Applied physics. B, Lasers and optics》2009,97(2):511-514
Excimer laser preionization induced by an external laser was investigated for XeF excimer laser discharge induced by a KrF
laser, paying attention to the ionized species in the gas. Enhancement of amplified spontaneous emission (ASE) was observed
for XeF gas discharge preionized by a KrF laser with and without its irradiation. In contrast, no ASE enhancement was observed
for KrF gas discharge with KrF laser preionization. ASE enhancement was larger for the longer wavelength, which was close
to the two-photon resonance of the Xe atom, when tunable KrF laser irradiation was used. These results indicate that multi-photon
ionization of Xe atoms supplied the initial electrons to the laser-induced preionization. 相似文献
12.
Gas density measurement of pulsed gas jets using XeF four-photon fluorescence induced by a KrF laser
The gas densities of two pulsed gas jets were measured together with spatial and temporal distributions by the XeF fluorescence induced by a KrF laser. The B-X and C-A transitions of XeF showed a biquadratic dependence on laser intensity when SF6 was used as the F donor instead of F2, and quadratic and cubic dependences on gas density, respectively. 相似文献
13.
14.
Ion synthesis and laser annealing of Cu nanoparticles in Al2O3 总被引:1,自引:0,他引:1
A.L. Stepanov V.N. Popok D.E. Hole I.B. Khaibullin 《Applied Physics A: Materials Science & Processing》2002,74(3):441-446
Al2O3 samples with Cu nanoparticles, synthesised by ion implantation at 40 keV with a dose of 1×1017 ion/cm2 and a current density from 2.5 to 12.5 μA/cm2, were annealed using ten pulses from a KrF excimer laser with a single pulse fluence of 0.3 J/cm2. The copper depth distribution, formation and modification of metal nanoparticles under the ion implantation and laser treatment
were studied by Rutherford backscattering (RBS), energy dispersive X-ray (EDX) analysis, atomic force microscopy (AFM) and
optical spectroscopy. It was found that laser annealing leads to a reduction in the nanoparticle size without diffusion of
metal atoms into the bulk. The change in particle size and the possibility for oxidation of the copper particles are examined
in the framework of Mie theory. Calculations presented show that under excimer laser treatment, Cu nanoparticles are more
likely to be reduced in size than to undergo oxidation.
Received: 19 April 2001 / Accepted: 7 November 2001 / Published online: 23 January 2002 相似文献
15.
Li Hongda Panchenko Y. N. Andreev M. V. Puchikin A. V. Yampolskaya S. A. Losev V. F. Anufrick S. S. 《Russian Physics Journal》2021,63(12):2070-2075
Russian Physics Journal - Results of studies of the electric-discharge KrF laser with a specific pulse energy of ~6 J/L and an internal energy efficiency of more than 4% are presented. The... 相似文献
16.
V. D. Zvorykin A. O. Levchenko A. G. Molchanov I. V. Smetanin N. N. Ustinovskii 《Bulletin of the Lebedev Physics Institute》2010,37(2):60-64
The grazing mode of microwave propagation in a hollow plasma waveguide formed by ionization of atmospheric air with a small
easily ionized additive by strong UV pulses of the Garpun KrF laser (λ = 248 nm, the pulse duration and energy are ∼70 ns and ∼50 J) was experimentally demonstrated for the first time. The annular
laser beam produced a hollow tube ∼10 cm in diameter with an electron density of ∼1012 cm−3 in a plasma wall ∼1 cm thick, over whichmicrowave radiation with λ
mw
∼ 8 mm was transmitted to a distance of 60 m. Themicrowave signal transmitted by the waveguide was amplified by a factor
of 6 in comparison with propagation in free space. 相似文献
17.
I. Okuda J. Ma E. Takahashi I. Matsushima Y. Matsumoto S. Kato Y. Owadano 《Applied physics. B, Lasers and optics》2001,72(5):623-626
The initial test results of the high-repetition-rate (rep-rate) electron-beam (e-beam) pumped KrF laser amplifier under development
in our laboratory are reported. This amplifier is aimed at producing a laser energy of 20 J per pulse at a rep rate of 1 Hz.
Thus far, 700 consecutive e-beampulses (250 kV, 270 J/pulse) were generated at a rep rate of 1 Hz. The laser gas was repetitively
pumped by the e-beams injected through the water-cooled diaphragm foils.
Received: 5 February 2001 / Published online: 21 March 2001 相似文献
18.
O. V. Vikhrova Yu. A. Danilov B. N. Zvonkov A. V. Zdoroveishchev A. V. Kudrin V. P. Lesnikov A. V. Nezhdanov S. A. Pavlov A. E. Paraffin I. Yu. Pashenkin S. M. Plankina 《Physics of the Solid State》2017,59(11):2150-2154
Laser annealing experiments were performed in order to increase the concentration of electrically active manganese in the layers of A3B5: Mn semiconductors. An LPX-200 KrF excimer laser with a wavelength of 248 nm and a pulse duration of ~30 ns was used. It is shown experimentally that at a pulse energy of an excimer laser of >230 mJ/cm2, the hole concentration in GaAs: Mn layers increases to 3 × 1020 cm–3. The negative magnetoresistance and the anomalous Hall effect with a hysteresis loop for annealed GaAs: Mn samples remain the same up to 80–100 K. Similar changes are observed for InAs: Mn layers as a result of laser annealing. 相似文献
19.
M. Watanabe A. Endoh N. Sarukura S. Watanabe 《Applied physics. B, Lasers and optics》1989,48(5):417-420
A 180-fs UV pulse has been generated based on a hybrid synchronously pumped mode-locked dye laser for a multiterawatt KrF laser system. The pulse width was measured by the single shot autocorrelation technique with the three-photon fluorescence of the XeF C-A transition. The pulse width broadening due to dispersive media was investigated. The results show that the observed pulse width broadening from 210 fs to 390 fs through the entire system is explained mostly by the linear dispersion of the optical elements for near-transform-limited input pulses. 相似文献
20.
K. A. Vorotilov V. D. Zvorykin I. G. Lebo A. S. Sigov 《Journal of Russian Laser Research》2004,25(3):234-238
Preliminary experiments on laser annealing of ferroelectric samples by ultraviolet radiation of a KrF laser are carried out. In principle, laser annealing allows one to reduce appreciably the duration of thermal action, minimize the size of the samples treated, and control the crystallization processes in the samples. A special focussing system was employed to provide homogeneous irradiation of the spot with dimensions of ~1×1 cm2 within a broad energy range from 0.1 to 10~J per pulse. The range of energy densities leading to phase transitions in thin films is determined. 相似文献