共查询到20条相似文献,搜索用时 0 毫秒
1.
2.
M. Czanta C. Strietzel H. J. Besch H. F. Beyer F. Bosch R. Deslattes F. Förster A. Gumberidze G. Hölzer P. Indelicato C. Kozhuharov O. Klepper A. Krämer D. Liesen T. Ludziejewski X. Ma B. Manil G. Menzel N. Pavel A. Simionovici M. Steck T. Stöhlker S. Toleikis J. Tschischgale A. H. Walenta O. Wehrhan 《Hyperfine Interactions》2001,132(1-4):487-490
Crystal spectrometry and absorption edge technique have the capability to overcome the gap in accuracy between experiment
and theory in the strong field domain of QED. New results are presented which indicate the capacity of these methods to measure
the energies of X-rays emitted by highly charged heavy ions at modern storage rings with a precision sensitive to second order
corrections to the Lambshift in H-like very heavy ions.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
3.
Tunable Diode Laser Absorption Spectroscopy Detection of N2O at 2.1μm Using Antimonide Laser and InGaAs Photodiode 下载免费PDF全文
Tunable diode laser absorption spectroscopy detection of N2 0 around 2.1 μm is demonstrated by using a homemade InGaAsSb/AlGaAsSb MQW laser diode and an InGaAs wavelength extended photodiode. Details of the devices and the detection system are described. In the system, the laser is driven by low frequency pulses with long duration to form a wavelength scan around 4741 cm^-1; the absorption information is obtained from the detected signal of the photodiode. By using a gas cell with 15cm path length, a detection limit is estimated to be smaller than 0.2 Torr. 相似文献
4.
In the 9387–9450 cm–1 region at temperatures of 300–1000 K, we have used an intracavity laser spectrometer based on a neodymium laser with threshold
sensitivity to absorption 10–8 cm–1 and spectral resolution 0.035 cm–1 to study the absorption spectrum of D216O, H216O, and HD16O vapor. The high-temperature spectrum contains more than 450 absorption lines, 240 of which are assigned to the HDO isotopomer.
The absorption lines of HDO were identified and belong to nine vibrational transitions: 3ν2 +ν3, 2ν1 + 3ν2, 2ν1 + ν3, 4ν2 + ν3, 7ν2, ν1 + 2ν2 + ν3, ν1 + 5ν2, ν1 + 2ν2, and 3ν3 – ν2. 相似文献
5.
6.
Afonin A. G. Bogolyubsky M. Yu. Volkov A. A. Elumakhov D. K. Zapolsky V. N. Ivanilov A. A. Kalinin A. Yu. Krinitsyn A. N. Kulagin N. V. Kryshkin V. I. Patalakha D. I. Romanishin K. A. Skvortsov V. V. Talov V. V. Turchanovich L. K. Chesnokov Yu. A. 《Physics of Atomic Nuclei》2021,84(4):475-482
Physics of Atomic Nuclei - The inclusive differential cross sections for the production of $$\pi^{\pm}$$ and $$k^{-}$$ mesons, protons, and antiprotons with momenta between 6 and 50 GeV/c and... 相似文献
7.
A. Braud P.Y. Tigreat J.L. Doualan R. Moncorgé 《Applied physics. B, Lasers and optics》2001,72(8):909-912
Room-temperature cw laser operation on the 3
F
4?3
H
6 transition at 1.85 μm of Tm3+ ions in a KY3F10 single crystal is reported here for the first time. Using a cw Ti:sapphire laser as a pump source, a threshold absorbed pump
power of 120 mW and a laser slope efficiency of 42.5% were achieved by using a 45% transmissive output coupler. Optimization
of the activator concentration and crystal length is discussed taking into account self-quenching and pump-absorption efficiencies
as well as parasitic and intrinsic reabsorption losses. The emission cross-section at the laser wavelength is determined using
different methods, showing that the result of the J–O approach is, in this case, very uncertain.
Received: 2 January 2001 / Revised version: 7 February 2001 / Published online: 27 April 2001 相似文献
8.
Quantitative Fourier‐transform infrared spectroscopic analysis was used for the determination of adsorption capacity of a model volatile organic compound (VOC) under dynamic conditions. The analytical method used also offers the possibility of distinguishing between reversible and irreversible adsorption as well as further detection of adsorbed VOC transformation. The obtained adsorbed amounts have been used for the determination of the heat of adsorption and the activation energy of desorption using, respectively, isosteric and temperature programmed desorption methods. The approach has been applied to explore the potential use of local clay as an adsorbent material for VOC pollutants. 相似文献
9.
We present the strict design parameters of the experiment for the 780 nm tunable continuous-wave second harmonic (SH) generation by the nonlinear resonator containing a MgO doped periodically poled LiNbO3 (MgO:PPLN) crystal. Optimization of such critical parameters, including focusing and impedance matching, more than 84% SH conversion efficiency and 3.1 W available output power at 780 nm were obtained from the fundamental wave at 1560 nm with two different input couplers. The thermal saturated behavior of the SH output power has been observed in the experiment. The beam quality factor M2 of the generated SH wave is 1.04 (1.03), and the RMS power stability is 1.29% in 3 h. The SH wave was further used to detect the D 2 transitions of Rb atom, exhibiting a fine tunable characteristic. Such laser source can be a suitable candidate in the atomic physics and quantum optics. 相似文献
10.
The thermal lensing, output characteristics of an end-pumped NYAB laser with high pump power levels and operated at the fundamental wavelength, and the manner of self-frequency-doubling, have been investigated. The thermal lensing in the NYAB crystal was found to be significantly stronger than that in Nd:YVO4 crystal. A maximum output of 3.2 W at 1.06 μm was achieved with an optical conversion efficiency of 29.1% and an average slope efficiency of 37.5%. These results were found to be slightly inferior to those of Nd:YVO4 crystal. When operated in the fashion of selffrequency-doubling, 23 mW green output was obtained at the incident pump power of 5 W, such inefficient operation was attributed to the large mode size in the NYAB crystal. 相似文献
11.
J. A. Nwaboh J. Hald J. K. Lyngsø J. C. Petersen O. Werhahn 《Applied physics. B, Lasers and optics》2013,110(2):187-194
Recently, hollow-core photonic bandgap fibers (HC-PBFs) for use in the 2 μm wavelength region have become available. We have employed tunable diode laser absorption spectroscopy (TDLAS) to quantify CO2 in nitrogen, injected into a HC-PBF. Our spectrometer contains both an HC-PBF-based absorption cell and an astigmatic Herriott multipass gas cell. The Herriott cell was used for comparison with the HC-PBF cell. The HC-PBF cell’s sensitivity and limit of detection were calculated to be 3.5×10?4 cm?1?Hz?1/2 and 59 ppm?m, respectively. To substantiate the spectrometer performance, a measurement was done in the Herriott cell probing a reference gas mixture with nominal 400 μmol/mol CO2 in N2. The spectrometric results were in good agreement with the reference value. The relative standard uncertainty of the spectrometric result was found to be at the ±2 % level. 相似文献
12.
LIU Junhai WANG Jiyang SUN Lianke SHAO Zongshu JIANG Minhua 《Chinese Journal of Lasers》2001,10(1):1-5
1 Introduction Self frequency doublinglasercrystals,whichcombinetwodifferentfunctionsoflaseremissionandfrequencyconversion ,provideasimplewayofgeneratingcoherentvisibleradiation .Amongthevariousself frequency doublingcrystals ,neodymiumyttriumaluminumbora… 相似文献
13.
The structure of theS-matrix at them-partical thresholds=(m)2 of amm process (m2) inv-dimensional space-time is determined in a theory with a simplified unitarity equation corresponding to a puremm interaction. If (m–1)(v–1) is odd, a two-sheeted, square-root type structure is obtained as in the usual case of two-particle thresholds in dimension 4. The nature of the singularity is more complicated if (m–1)(v–1) is even (e.g.m=3 in dimension 4). Results obtained in this case include an orthogonal decomposition of the scattering functionT with nonholomic eigenvalues of the form [1/2iln+b
i
()]–1 [where =(m)2–s andb
i
is uniform around =0] and a related infinite expansion ofT in powers of ln involving an on-shell irreducible kernelU which is the analogue for (m–1)(v–1) even of Zimmerman'sK-matrix. 相似文献
14.
Dudelev V. V. Mamutin V. V. Chistyakov D. V. Kognovitskaya E. A. Kuchinskii V. I. Maleev N. A. Vasil’ev A. P. Kuz’menkov A. G. Ustinov V. M. Sokolovskii G. S. 《Optics and Spectroscopy》2019,127(3):479-482
Optics and Spectroscopy - Results of studying stripe quantum cascade lasers emitting at room temperature in the spectral range of 4.8 µm are presented. Power characteristics and turn-on... 相似文献
15.
《Infrared physics》1990,30(5):435-441
Antenna patterns of open structure Schottky mixers were measured at 184, 214 and 287 μm. For use in a heterodyne detector system the antenna pattern must be matched to the signal beam, for example the astronomical signal of a telescope, and the optically coupled local oscillator beam. The procedure of determining a lens system is described and the successful application in astronomical observations with the Kuiper Airborne Observatory (KAO) is shown. 相似文献
16.
Xujiao Gao Mithun D’Souza Dan Botez Irena Knezevic 《Optical and Quantum Electronics》2008,40(5-6):331-336
We present the design and optimization of a deep-well GaAs-based quantum cascade laser (QCL) emitting at 6.7 μm, the shortest wavelength in GaAs-based QCLs, using a multivalley Monte Carlo simulation. Simulation results provide direct insights into optimizing the layer sequence design. The optimized structure exhibits sufficient gain for lasing at both 77 and 300 K. The calculated threshold-current densities are 5 kA/cm2 at 77 K and 14 kA/cm2 at 300 K. 相似文献
17.
18.
We present simulations for a design of a high-energy single-stage mid-IR difference frequency generation adapted to a two-color Ti:sapphire amplifier system. The optimized mixing process is based on chirped pulse difference frequency generation (CP-DFG), allowing for a higher conversion efficiency and reduced two-photon absorption losses. The numerical start-to-end simulations include stretching, chirped pulse difference frequency generation and pulse compression. Realistic design parameters for commercially available nonlinear crystals (GaSe, AgGaS2, LiInSe2, LiGaSe2) are considered. Compared with conventional unchirped DFG directly pumped by Ti:sapphire technology, we predict a threefold increase in the quantum efficiency. Our CP-DFG scheme provides up to 340 μJ pulse energy directly at 7.2 μm when pumped with 8 mJ and supports a bandwidth of up to 350 nm. The resulting 240 fs mid-IR pulses are inherently phase stable. 相似文献
19.
E. A. Arbabzadah C. C. Phillips M. J. Damzen 《Applied physics. B, Lasers and optics》2013,111(2):333-339
A study is made of a diode pumped Er3+:YSGG laser crystal operating at 2.797 μm. Lasers were constructed in the bounce geometry, using a transversely cooled 50 at.% Er:YSGG slab and a face-cooled 38 at.% Er:YSGG slab. Results from these are compared with those from a 50 at.% Er3+:YAG laser, also in the bounce geometry. With quasi-continuous wave diode pumping, free-running pulse energies of up to ~55 mJ and a slope efficiency of 20.5% are obtained from 50 at.% Er:YSGG. Better thermal performance is obtained from the face-cooled 38 at.% Er:YSGG slab, allowing average power of ~2 W to be obtained at a repetition rate and pump pulse duration of 140 Hz and 500 μs, respectively. Both Er:YSGG systems perform better than Er:YAG. Numerical modelling of the free-running 50 at.% Er:YSGG and Er:YAG systems is undertaken with good qualitative agreement with experimental results. Electro-optic Q-switching of the 50 at.% Er:YSGG laser using a LiNbO3 crystal yields ~0.5 mJ pulses with ~77 ns duration. 相似文献