共查询到20条相似文献,搜索用时 31 毫秒
1.
Jackson M. Hockel H. Lauters M. Vasconcellos E.C.C. Allen M.D. Evenson K.M. 《Quantum Electronics, IEEE Journal of》2002,38(5):429-431
We report the discovery of 15 new laser emissions from 13 CD3OD when optically pumped with a CW CO2 laser. The wavelengths of these lines, ranging from 57.5 to 135.2 μm, are reported along with their polarization relative to the CO2 pump laser, operating pressure and relative intensity. A three-laser heterodyne system was then used to measure the frequencies of 12 optically pumped laser emissions from this methanol isotope. These emissions range from 65.7 to 151.8 μm and are reported with fractional uncertainties up to 2·10-7 相似文献
2.
Assignments are presented for seven far infrared (FIR) laser lines of CH3 OH pumped by theS-9P(31),18-10R(24),13-9R(26) , and13-9P(16) CO2 laser lines, plus an interesting speculation for the FIR line pumped by the18-9P(12) CO2 line. Frequencies have been deduced to a substantially improved accuracy of ±0.001 cm-1from IR and FIR spectroscopic combination differences for most of the assigned lines as well as three other predicted transitions. In addition, accurate frequencies are given for 13 predicted FIR laser transitions which are expected from the IR spectrum to be pumped by three16O12C18O laser lines. 相似文献
3.
Viscovini R.C. Telles E.M. Scalabrin A. Pereira D. 《Quantum Electronics, IEEE Journal of》1999,35(11):1613-1615
In this paper, we report new optically pumped far-infrared (FIR) laser lines from the in-plane CD3-rocking and asymmetric CD 3 deformation absorption vibrational bands of 13CD 3OD. A waveguide CO2 laser of wide tunability (290 MHz) was used as the pump source, and a Fabry-Perot open cavity as the FIR laser resonator. Optoacoustic absorption spectrum was used as a guide to search for new FIR laser lines. We could observe 13 new laser lines in the range 103-491 μm. The lines were characterized according to wavelength, relative polarization, relative intensity, and optimum working pressure. The transferred lamb-dip technique was used to measure the frequency absorption transition for both new and previously reported laser lines 相似文献
4.
Moraes J.C.S. Bertolini A. Carelli G. Ioli N. Moretti A. Strumia F. 《Quantum Electronics, IEEE Journal of》1996,32(10):1737-1739
We report 18 new laser lines from 13CH3OH generated in an optically pumped far-infrared laser; the laser lines are in the range of 54.2-420 μm and are all characterized in wavelength, polarization relative to the pumping CO2 radiation, and pump offset relative to the CO2 center frequency. The frequencies of seven of these new lines along with 10 previously reported lines were measured by an accurate heterodyne technique, mixing them in a metal-insulator-metal (MIM) point contact diode, with another laser line of known frequency 相似文献
5.
An observation is reported of a large number of new laser lines from 12CD3F gas optically pumped with a continuously tunable high-pressure pulsed CO2 laser. Making use of the coincidence of the 10 μm P and R branches of CO2 with the v 3 and v 6 vibrational-rotational absorption bands of 12CD3F, 180 laser lines were found in the wavenumber range between 8 and 55 cm-1, all of them yet unknown; these lines are studied for characteristic properties of laser action. All laser lines are assigned as pure rotational transitions in the vibrational excited or ground states 相似文献
6.
Gastaud C. Sentz A. Redon M. Fourrier M. 《Quantum Electronics, IEEE Journal of》1980,16(12):1285-1287
Fifteen new CW FIR laser lines are reported from Stark tuned CO2 optically pumped CH3 OH and CH3 OD. Four new CW laser lines have also been observed from zero field optically pumped CH3 OD, three with a CO2 laser, and one with an N2 O laser. 相似文献
7.
Six new CW far infrared laser lines are reported for the cis 1, 2 C2 H2 F2 molecule optically pumped by a CO2 laser. Of these, two have high conversion efficiencies in the 1-2 percent range. 相似文献
8.
The wavelength, polarization, and output power of several lines of the optically pumped CW FIR12CH3 16OH (methanol) and12CH3 16OD (1-D deuterated methanol), methyl iodide, methyl bromide, and deuterated methylene chloride lasers have been determined. In addition to lines already reported in the literature, seven strong lines have been observed. Optimum performance of the laser system is achieved by means of an improved coupling of the CO2 pump power into the resonator and extraction of the FIR power from the resonator. Measurements on the power absorption coefficient of water using the laser indicate thatalpha(bar{nu}) rises to almost 1100 Np ċ cm-1at 170 cm-1, and then shows a gradual fall with an increase in frequency. A strong temperature dependence of the 200 cm-1peak inalpha(bar{nu}) is predicted, with a decrease in the frequency of maximum power absorption coefficient with an increase in temperature. The range of measurements for acetonitrile is extended to lower frequencies so as to overlap with those determined from other millimeter wave techniques. For highly power-absorbing liquids,alpha(bar{nu}) is estimated to be within ± 5 percent. 相似文献
9.
Far-infrared laser action is reported for the first time from the optically pumped CH2 F2 molecule. Lasing on twelve FIR transitions was produced by pumping with six emission lines in theR branch of the 9.6 μm band of the CW CO2 laser. High conversion efficiencies of up to 20 percent of the quantum limit have been obtained with the stronger FIR laser lines. 相似文献
10.
Two new submillimeter laser transitions are reported for CH2 F2 optically pumped by the 9R(34) CO2 line. The new transitions allow us to assign molecular transitions to the complete group of laser lines observed with that pump transition. 相似文献
11.
Thirteen new submillimeter laser lines have been detected in chlorofluoromethane optically pumped with a CW12C16O2 laser. Their wavelengths measured in a Fabry-Perot resonator to an accuracy better than 0.5 percent, lie between 175 and 1014 μm. 相似文献
12.
Twenty-one new CW far-infrared laser lines have been observed from the CD3 OH molecule pumped by a CO2 laser. The wavelengths of these new lines fall in the short wavelength range from 34.5 to 287 μm. 相似文献
13.
We report the precise wavelength measurement (0.01 Å or 0.03 cm-1) of CW laser emission lines from Li2 and Na2 molecules, optically pumped by a single frequency argon laser. All 22 lines from Li2 have been assigned unambiguously. We observed, for the first time in these systems, the existence of pure Raman laser lines (nonresonant pumping and gain without population inversion). Among the 49 lines from Na2 , 13 could not be assigned, which suggests the possibility of other pumping mechanisms: collision induced transitions or two-step excitation to a higher electronic state. 相似文献
14.
26 new FIR laser lines have been observed in CO2 laser pumped CH3 OH, and together with some previously observed lines their wavelengths have been measured with a relative accuracy of3 times 10^{-4} by using the FIR resonator as a scanning Fabry-Perot interferometer. Based on the internal consistency of the data, it is suggested that a number of the lines originate from combination bands involving simultaneous excitation of the CO stretch mode and a different vibrational mode. 相似文献
15.
Zink L.R. Galvao G.P. Evenson K.M. Vasconcellos E.C.C. 《Quantum Electronics, IEEE Journal of》1994,30(6):1361-1362
We have measured 30 far-infrared laser frequencies of optically pumped 13CD3OH, 13 of which are new lines. The frequencies range from 0.5 to 4.9 THz with the majority between 0.75 and 1.5 THz. Two frequency stabilized CO2 lasers were used as standards for the heterodyne measurements 相似文献
16.
Marx R. Hubner U. Abdul-Halim I. Heppner J. Yu-Cai Ni Willenberg G. Weiss C. 《Quantum Electronics, IEEE Journal of》1981,17(6):1123-1127
The FIR Raman and laser gain properties of14NH3 optically pumped by the CO2 9R(30) and the N2 O10P(13) laser lines, respectively, have been measured and calculated using the quantum mechanical theory of three-level systems. The laser gain is about two orders of magnitude higher than for usual FIR laser transitions. The Raman gain shows two features characteristic for the two-photon process: extremely high saturation intensity and high pressure maximum. Very satisfactory agreement between theoretically calculated and experimentally measured gain properties is found. 相似文献
17.
Eleven new far-infrared (FIR) laser lines have been observed from CH3 OH pumped by a CO2 laser. These lines are ranged from 78 to 694 μm and are obtained by using a copper waveguide cavity. 相似文献
18.
To reduce the linewidth mismatch between the emission lines of a CO2 -TEA laser and the absorption lines of a low-pressure FIR gain medium a tiltable Ge etalon has been introduced into the TEA resonator. The resulting spectral compression and tunability increase the energy conversion efficiency in a TEA laser pumped CH3 OH laser by as much as a factor of 37 and has led to the observation of 14 new FIR laser lines. 相似文献
19.
Rabinovich W.S. Bowman S.R. Feldman B.J. Winings M.J. 《Quantum Electronics, IEEE Journal of》1991,27(4):895-897
The tuning characteristics of the 5I 6 -5I 7 transition in a Ho:YAlO3 laser, intracavity pumped by a 1.079 μm Nd:YalO3 laser, were studied. Operation on seven distinct lines between 2.844 and 3.017 μm was found, and the threshold and relative slope efficiency of each line was measured. Several of these lines were previously unreported 相似文献
20.
Thirteen far IR laser lines in CH3 OH, optically pumped by a CO2 laser, have been assigned toa - andb -type transitions in ν5 CO-stretch band. Identification procedures used were: a frequency match between the CO2 pump and CH3 OH absorption, frequency match of laser lines and CH3 OH ν5 transitions, polarization of far IR radiation, cascade and competition effects between far IR laser lines, and frequency consistencies. An improved set of molecular constants for ν5 transitions were also obtained. 相似文献