共查询到20条相似文献,搜索用时 11 毫秒
1.
M. V. Zagidullin 《Optics and Spectroscopy》2010,109(4):538-542
In the temperature range of T = 150–400 K, the dependence of spectral widths (cm−1) on temperature, 182 + 0.38(±0.01)T and 217 + 0.48(±0.01)T, respectively, has been obtained for dimole emission of O2(a, 0) + O2(a, 0) → O2(X, 1) + O2(X, 0) + hν (λ = 703 nm) and O2(a, 0) + O2(a, 0) → O2(X, 0) + O2(X, 0) + hν (λ = 634 nm). It was shown that the ratio of dimole emission rate constants does not depend on temperature in the range
of 150–400 K and is 1.06 ± 0.01. 相似文献
2.
A. S. Kirillov 《Technical Physics》2011,56(12):1731-1736
The quenching rate constants for the singlet states (a′)(1)Σ
u
− (v = 1−17), a
(1)Π
g
(v = 0−14), and w
(1)Δ
u
(v = 0−13) of molecular nitrogen colliding with an N2 molecule are calculated using quantum-chemical approximations. It is shown for the first time that both the intramolecular
and intermolecular processes of electronic excitation transfer are significant for these states. Calculated rate constants
are in satisfactory agreement with experimental data. 相似文献
3.
4.
A diode laser spectrometer at 634nm and absolute frequency measurements using optical frequency comb
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This paper reports that two identical external-cavity-diode-laser
(ECDL) based spectrometers are constructed at 634 nm referencing on
the hyperfine B-X transition R(80)8-4 of 127I2. The lasers
are stabilized on the Doppler-free absorption signals using the
third-harmonic detection technique. The instability of the
stabilized laser is measured to be 2.8×10-12 (after
1000 s) by counting the beat note between the two lasers. The
absolute optical frequency of the transition is, for the first time,
determined to be 472851936189.5 kHz by using an optical frequency
comb referenced on the microwave caesium atomic clock. The
uncertainty of the measurement is less than 4.9 kHz. 相似文献
5.
L. I. Fedoseev I. V. Kuznetsov 《International Journal of Infrared and Millimeter Waves》1984,5(7):1027-1037
The results of processing the data of an annual cycle of synchronous measurements of the Earth's atmosphere emission in two transparency windows are reported. 相似文献
6.
7.
L. Torrisi S. Gammino A. M. Mezzasalma C. Gentile J. Krsa L. Lska K. Rohlena J. Badziak P. Parys J. Wolowski 《Applied Surface Science》2003,220(1-4):193-202
The high power pulsed laser Prague asterix laser system (PALS), operating at the fundamental (1ω) and third (3ω) harmonics (1315 and 438 nm wavelengths, respectively), is employed in a single-shot mode to irradiate tantalum targets in vacuum. The laser pulse width is 400 ps and the laser pulse energy ranges between 43 and 736 J at 1ω and between 12 and 230 J at 3ω. High ablation yields (0.1–0.6 mg per pulse) are measured as a function of the laser pulse energy at both wavelengths; at 438 nm higher etching rates are observed. The produced craters are analysed by the scanning electron microscope (SEM) and by the high sensitivity surface profiler system. They are investigated in dimension, shape and angle aperture as a function of the incident laser energy. Different possible mechanisms responsible for the different crater shapes are presented and discussed. 相似文献
8.
X. L. Zhang X. Y. Zhang Q. P. Wang C. Wang H. H. Xu Y. Tang L. Li Z. J. Liu X. H. Chen S. Z. Fan Z. T. Jia X. T. Tao 《Laser Physics》2011,21(6):1047-1050
A diode-side-pumped continuous-wave Nd:GGG laser operating at dual-wavelength (1110 and 1105 nm) and single wavelength of 1110 nm is demonstrated for the first time. The maximum output power of the 1110 and 1105 nm dual-wavelength operation is 13.2 W. By adjusting the orientation of an insertion mirror, the relative intensities of the two wavelengths can be changed. Thus single wavelength operation at 1110 nm is obtained, and the output power is 9.6 W. 相似文献
9.
10.
We present for the first time a Nd:YVO(4) laser emitting at 1064 nm intracavity pumped at 912 nm by a Nd:GdVO(4) laser. We carried out a model to design the system properly, and laser performance was experimentally investigated. Intracavity sum-frequency mixing at 912 and 1064 nm was then realized in a BiBO crystal to reach the blue range. We obtained a cw output power of 155 mW at 491 nm with a pump laser diode emitting 20 W at 808 nm. 相似文献
11.
Dedicated to Prof. Dr. Eckard Kr?tzig on the occasion of his 60th birthday.Five annealed BaTiO3:Rh crystals, including as-grown and those reduced at 10-5 atm, 10-10 atm, 10-12 atm, and 10-14 atm oxygen partial pressures, were produced and investigated by two-beam coupling at wavelengths of 514 nm and 633 nm. The
carrier type is a function of reduction degree and incident wavelength. The compensation points are around 10-3 atm and 10-11 atm oxygen partial pressures for 514 nm and 633 nm, respectively. The electrooptic gain is controlled by the photoconductivity–dark
conductivity ratio, effects from the deep and shallow traps, and hole–electron competition, which are dependent on the reduction
degree and incident wavelength.
Received: 23 November 1998 / Revised version: 10 February 1999 / Published online: 12 April 1999 相似文献
12.
13.
Milton SV Gluskin E Biedron SG Dejus RJ Den Hartog PK Galayda JN Kim K Lewellen JW Moog ER Sajaev V Sereno NS Travish G Vinokurov NA Arnold ND Benson C Berg W Biggs JA Borland M Carwardine JA Chae Y Decker G Deriy BN Erdmann MJ Friedsam H Gold C Grelick AE 《Physical review letters》2000,85(5):988-991
Experimental evidence for self-amplified spontaneous emission (SASE) at 530 nm is reported. The measurements were made at the low-energy undulator test line facility at the Advanced Photon Source, Argonne National Laboratory. The experimental setup and details of the experimental results are presented, as well as preliminary analysis. This experiment extends to shorter wavelengths the operational knowledge of a linac-based SASE free-electron laser and explicitly shows the predicted exponential growth in intensity of the optical pulse as a function of length along the undulator. 相似文献
14.
G. C. Sun Y. D. Lee B. Z. Li X. Y. Chen M. Zhao J. B. Wang X. H. Zhang G. Y. Jin 《Laser Physics》2011,21(6):985-987
A dual-wavelength continuous-wave (CW) diode end-pumped Nd3+:YAlO3 (Nd:YAP) laser that generates simultaneous laser action at the wavelengths 930 and 1341 nm is demonstrated. A total output
power of 778 mW for the dual-wavelength was achieved at the incident pump power of 17.8 W. Furthermore, intracavity sum-frequency
mixing at 930 and 1341 nm was then realized in a LBO crystal to reach the yellow-green range. We obtained a total CW output
power of 103 mW at 549 nm. 相似文献
15.
Difluorodiazirine fluoresces strongly in the vapor phase showing an extensive band system from about 352 to 451 nm and with no background continuum. The fluorescence is assigned as and corresponds to the 352 nm absorption system previously studied.The band system is dominated by a progression in ν1″, the a1N = N stretching vibration, with ν4″, the a1 CF2 symmetrical deformation vibration, showing a shorter progression.The 000 and most others show type B rotational contours but type C bands, involving ν5″ (a2), and probably type A bands, involving ν7″ (b1) and perhaps ν6″ (b1) are also observed.The extremely low intensity of bands involving ν3″ (a1) is surprising but there seems to be no reason to doubt the assignment from infrared and Raman data.There is a strong vibrational perturbation affecting some quite strong bands in a region within about 275 cm?1 of bands 1n0400, where n = 0 – 3. The cause of the perturbation is not known.There is no evidence for the emission spectrum consisting of more than one band system. 相似文献
16.
The electrical and optical characteristics of GaN-based light-emitting diodes (LEDs) fabricated with emission wavelengths of 429-467 nm were investigated. The optical output increased with increasing emission wavelength, which is attributed to the enhanced quantum confinement effect as a result of indium composition fluctuation. With higher indium content, the LEDs exhibited unfavorable performance, including a larger efficiency droop, spectral blueshift, and spectral broadening, due to indium-induced strains. The effect of heterointerfaces associated with the indium content of the active region on the device resistance was negligible. 相似文献
17.
We have pioneered a method of determining the rate constant of quenching of the excited electronic states of molecules by
molecular oxygen from measurements of the kinetics of photosensitized luminescence of singlet molecular oxygen (lδg). The method can be used in the case where the lifetime of the excited electronic state in an air-saturated solution is comparable
with or larger than the luminescence time of the singlet molecular oxygen in the given solvent. It is shown that this situation
is implemented on quenching, by molecular oxygen, of the excited triplet states associated with the biopolymers of tetrapyrrole
molecules in aqueous (H2O and D2O) solutions.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 67, No. 3, pp. 401–404, May–June, 2000. 相似文献
18.
J. K. Vij 《International Journal of Infrared and Millimeter Waves》1989,10(7):847-867
The problem of multiple internal reflections within the windows of an optical cell is analysed using Abele's matrix method. The Beer-Lambert power law is modified by the standing waves formed in between the cell and the detector. Power absorption coefficient of a material is calculated by a fit to the modified version of the equation. Precise values for water, acetonitrile and methylene chloride are calculated at far infrared wavelengths using a molecular laser source. 相似文献
19.
We introduce a method with which to obtain accurately the bulk optical parameters of fresh biological tissues in vitro by combining measurements of the sample surface profiles, reflectance, and transmittances with Monte Carlo-based inverse calculations. The bulk optical parameters of fresh porcine dermis tissue were determined at eight wavelengths from 325 to 1557 nm and were found to be much different from those determined without consideration of surface roughness. 相似文献
20.
P. P. Bobrov S. V. Krivaltsevich V. L. Mironov A. S. Jaschenko 《Russian Physics Journal》2006,49(9):907-912
The results of experimental investigation of temporal dynamics of radiobrightness temperature at the wavelengths 3.6, 5, and
11 cm in the course of frost penetration and thawing are presented for the soils with different humus content. Using the method
of simulating emission from a horizontally stratified medium, it is shown that radiobrightness temperature variation is related
to changes in the frozen soil layer thickness. It is noted that that dielectric permittivity of the frozen layer at the temperatures
around 0 °C is controlled by non-frozen bound water, whose content depends on the soil type. It is also underlined that in
certain cases proper interpretation of the experimental data requires inclusion of the soil moisture motion towards the cold
front into consideration.
__________
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 5–10, September, 2006. 相似文献