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1.
By optically pumping the deuterated isotopomers of 14NH3 and 15NH3 using 12C16O2, 13C16O2, 12C18O2, and 13C18O2 lasers, several new far-infrared (FIR) emission lines between 65 μm and 125 μm have been detected. The existing spectroscopy
of 14N-ammonia isotopomers has been used to identify many of these lines, as well as some previously observed but unidentified.
The spectroscopic data have been analyzed to predict over 20 additional FIR laser lines that could be pumped by a more capable
CO2 laser. This effort was motivated by a need for strong laser lines in frequency coincidence with molecular transitions of
astrophysical interest. Of particularnote is the measurement of the 2680-GHz line of 14NHD2, whose frequency is 4.9 GHz higher than that of the important J=1-0 line of interstellar HD.
Received: 25 July 2002 / Published online: 20 December 2002
RID="*"
ID="*"Corresponding author. Fax: +1-303/492-5941, E-mail: boreiko@spot.colorado.edu 相似文献
2.
Near-infrared laser action of atomic carbon was obtained using a hollow cathode discharge tube. Besides the known 1.4543 μm
and 1.0691 μm laser lines, cw laser operation at 1.0683 μm, 0.9658 μm, and 0.9406 μm wavelength was observed for the first
time. The source of carbon was due to dissociation of CO, CO2 or CH4 added to the He buffer gas. 相似文献
3.
M. Jackson E.M. Telles M.D. Allen K.M. Evenson 《Applied physics. B, Lasers and optics》2001,72(7):815-818
A significantly improved far-infrared laser has been used to generate optically pumped laser emissions from 26 to 150 μm for
CD3OH. Using an X–V-pumping geometry, several new laser emissions have been found for CD3OH. In addition, an increase in power, by factors from 10 to 1000, for many of the previously known shorter-wavelength laser
lines, below 100 μm, has been observed. Frequency measurements for several lines have also been performed and have been reported
to a fractional uncertainty up to ±2×10-7, permitting the spectroscopic assignment of the laser transition. One of the frequency-measured lines, 44.256 μm observed
using the 10R34 pump, has confirmed the assignment of the previously reported FIR emission (n,K;J)=(1,7;20)?(0,8;20)A in the
ground vibrational state.
Received: 26 October 2000 / Published online: 7 February 2001 相似文献
4.
M. Inguscio P. Minguzzi A. Moretti F. Strumia M. Tonelli 《Applied Physics A: Materials Science & Processing》1979,18(3):261-270
The operation of a cw FIR laser in the presence of a strong electric field is described. A hybrid metal-dielectric waveguide
is used and the cavity length is scanned to study how the frequency and power of the laser depend on the field strength. The
results have also been checked by heterodyning with a conventional reference laser. We report the results obtained for the
496 μm line of CH3F and the 70.5 μm and 119 μm lines of CH3OH. A large frequency tunability of almost ±40 MHz is obtained in the best case with power levels in the mW range. A very
simple theoretical model accounts for the experimental results. We also report the appearance of a new FIR line at about 204
μm when CH3OH is pumped by the 9 μmP(34) of CO2 in the presence of an electric field larger than 1.2 KV/cm. 相似文献
5.
G. Carelli N. Ioli A. M. Messina A. Moretti F. Strumia S. Zerbetto 《Applied physics. B, Lasers and optics》1991,52(1):32-35
We report new FIR laser lines from 13CH2F2 molecules optically pumped by a waveguide CO2 laser. The increased tunability (300 MHz) with respect to a conventional CO2 laser allows the pumping of 13CH2F2 vibrational transitions of large offset. 34 new laser lines have been discovered, ranging from 113.1 m to 491.4 m in wavelength, thus increasing the number of known FIR laser lines from this important molecule to 99. For all the new lines and many (36) of those known previously, precise offset measurements through the transferred Lamb-dip technique were performed. The frequency of six new laser lines was also directly measured by heterodyne detection with known laser lines. 相似文献
6.
Twenty FIR laser lines with wavelengths between 146 and 2000 m have been observed from deuterated formyl fluoride (DCOF) optically pumped with isotopic CO2 lasers. Tunable diode laser measurements on thev
4 band of DCOF were combined with earlier high precision spectroscopic data on thev
3 andv
4 bands, and enabled identification of the transitions responsible for 9 of the new FIR lines. 相似文献
7.
R.C. Viscovini E.M. Telles A. Scalabrin D. Pereira 《Applied physics. B, Lasers and optics》1997,65(1):33-35
2 laser of wide tunability to pump 13CD3OD we could observe 10 new far infrared laser lines ranging from 109 μm to 472 μm. The lines were generated by pumping infrared
absorbing transitions of large offset appertaining to the C-O stretching Q-branch. All lines were characterised in wavelength,
polarisation, optimum pressure of operation and precise offset measurements.
Received: 17 September 1996/Revised version: 18 November 1996 相似文献
8.
K.M. Evenson Q. Sanford C. Smith J. Sullivan D. Sutton E. Vershure M. Jackson 《Applied physics. B, Lasers and optics》2002,74(6):613-614
The partially deuterated isotopes of methanol, CH2DOH and CHD2OH, have been reinvestigated as sources of far-infrared (FIR) laser emissions using an optically pumped molecular laser (OPML)
system recently designed for wavelengths below 150 μm. With this system, 10 new FIR laser emissions from these isotopes ranging
from 32.8 to 174.6 μm have been discovered. This includes the shortest known OPML emission from CHD2OH, at 32.8 μm. These lines are reported with their operating pressure, polarizations relative to the CO2 pump laser and wavelengths, measured to ±0.5 μm. In addition, polarizations for three previously observed FIR laser lines
from CHD2OH were measured for the first time.
This paper is dedicated to the memory of Dr. K.M. Evenson, a pioneer in the field for his role in the development of optically
pumped molecular lasers and their use in laser frequency measurements and the laser magnetic resonance technique. His scientific
expertise, guidance, mentoring and friendship will be greatly missed.
Received: 27 March 2002 / Published online: 8 May 2002 相似文献
9.
E. M. Telles J. C. S. Moraes A. Scalabrin D. Pereira A. Moretti F. Strumia 《Applied physics. B, Lasers and optics》1991,52(1):36-41
In this work we report new FIR laser lines from CD3OD optically pumped by a CO2 waveguide laser. The wide tunability of this laser (290 MHz) makes it possible to pump absorption lines with large frequency offset relative to the CO2 laser line center, which are not possible by using conventional CO2 lasers. As a consequence 19 new laser lines have been discovered, ranging from 38.0 m to 455.2 m in wavelength. For all lines, precise frequency offset measurements between the CO2 line center and the center of the absorber CD3OD line were performed using the transferred Lamb-dip technique. We also present direct Doppler-free offset measurements of infrared absorption, obtained within the FIR laser cavity itself, using optoacoustic detection.Work supported by FAPESP, CNPq, FAP-Brasil and CNR-Italy 相似文献
10.
《Applied physics. B, Lasers and optics》1981,24(1):33-38
We report infrared laser emission in the region of 3 to 5 μm from sodium vapour optically pumped by a pulsed dye laser with
wavelengths ranging from 585 to 610nm. Twophoton excitation processes are believed to be responsible for the primary excitation.
Both molecular transitions (4 to 5 μm) between high lying states, and atomic transitions (52
S
1/2−42
P
3/2,1/2 at 3.41 μm) have been identified. 相似文献
11.
G. Carelli N. Ioli A. Moretti D. Pereira F. Strumia R. Densing 《Applied physics. B, Lasers and optics》1988,45(2):97-100
FIR laser lines close to the N+
3
P
2–3
P
1 transition at 122 m can be used as a local oscillator for heterodyne detectors. The frequencies of some candidate laser lines from CH2F2,13CH3OH, CD3OD, and CD3OH have been measured and the output power of the most interesting lines has been optimized. 相似文献
12.
Yu. L. Gusev S. I. Marennikov V. P. Chebotayev 《Applied physics. B, Lasers and optics》1977,14(1):121-122
Frequency-tunable generation by means of F
2
+
and F
2
−
colour centers in a LiF crystal is reported. Colour centers were created by illuminating LiF crystals with electrons of 3
meV energy at the electron current density of 1 μA/cm2. The pumping source was a ruby laser with a peak power of 20 MW, a pulse duration of 20 ns, and a repetition rate of 1 Hz.
The frequency tuning is obtained in the range of 0.88–1.25 μm. Discussed are the ways of pumping of colour centers and the
possibility of lasing in the spectral region of 0.85 to 2 μm in the type of colour centers under investigation. 相似文献
13.
N. Yamabayashi K. Fukai K. Miyazaki K. Fujisawa 《Applied physics. B, Lasers and optics》1981,26(1):33-36
A far-infrared (FIR) NH3 laser was resonantly pumped with a line-tunable infrared (IR) NH3 laser. The number of the observed FIR laser lines amounted to 33. Most of them belonged toaR(J,K) rotation-inversion transition in (0, 1, 0, 0) vibrational state. The line tunability of sealed-off FIR NH3 laser was almost achieved in 90, 115, 150, and 220 m wavelength regions by the selective line tuning of the pumping IR NH3 laser. 相似文献
14.
B. M. Landsberg 《Applied Physics A: Materials Science & Processing》1980,23(2):127-130
Two new cw submillimetre lines optically pumped by the 9 μR(30) CO2 laser have been observed for14NH3 and assigned to thea(6,0)→s(5,0) transition and to its cascade transitions(5,0)→a(4,0) in thev
2=1 state. In addition, six new emission lines have been observed for NH2D, and one tentatively assigned to the (11,1)→(10,1) transition of ND3. Methylamine has also been investigated and twenty-eight new emission lines have been discovered. 相似文献
15.
M. Jackson T.J. Garrod M. Ramberg A. Stokes 《Applied physics. B, Lasers and optics》2005,81(8):1067-1069
A recently improved three-laser heterodyne system was used to frequency measure ten previously observed optically pumped far-infrared
(FIR) laser emissions from the partially deuterated methanol isotopologue CH2DOH. Also, a 64.0 μm FIR emission generated by the 9P32 line of the carbon dioxide (CO2) laser was discovered and frequency measured. These newly measured frequencies have fractional uncertainties on the order
of ±2×10-7 and correspond to laser wavelengths ranging from 42.6 to 152.7 μm. The offset frequency for the CO2 pump laser was measured for twenty-two CH2DOH FIR laser emissions.
PACS 07.57.Hm; 42.55Lt; 42.62.Eh 相似文献
16.
N. Ioli A. Moretti D. Pereira F. Strumia G. Garelli 《Applied physics. B, Lasers and optics》1989,48(4):299-304
The12CH3
18OH molecule has been investigated for new far-infrared laser lines by optically pumping it with a cw waveguide CO2 laser. The larger tunability (318 MHz) with respect to a conventional CO2 laser permits the pumping of many12CH3
18OH lines. As a consequence 100 new laser lines have been discovered, ranging from 34.6 m to 653.2 m in wavelength. The infrared spectrum of12CH3
18OH has been observed and all the fundamental vibration energies measured. 相似文献
17.
J.C.S. Moraes A. Scalabrin M.D. Allen K.M. Evenson 《Applied physics. B, Lasers and optics》2002,74(6):541-543
Through the optical pump technique we have reinvestigated the CHD2OH molecule as a source of far-infrared (FIR) laser lines using for the first time a CO2 laser lasing on regular, hot, and sequence bands. As a consequence, we present here spectroscopic data of 16 new FIR laser
transitions from this molecule. Furthermore, we also present a catalogue of all FIR laser lines generated from CHD2OH.
Received: 13 July 2001 / Revised version: 25 October 2001 / Published online: 14 May 2002 相似文献
18.
For the first time stable cw output of a FIR-CO2 hybrid laser has been achieved at wavelengths shorter than 300 m. Due to the saturable absorber characteristic of the FIR laser gas, cw or pulsed emission is observed on both, the CO2 and the FIR laser output, depending on the operating conditions. Results are reported on different resonant lines in CH3OH and the 67 m Raman line in NH3. The good efficiency of this laser is also demonstrated by the excitation of two new emission lines in CH3OH, namely 49 and 56 m, pumped by 9R(22) and 9R(24), respectively.On leave from the Institute of Physics, University of Beograd YU-11000, Beograd, Yugoslavia 相似文献
19.
CW laser performance of Yb and Er,Yb doped tungstates 总被引:2,自引:0,他引:2
N. V. Kuleshov A. A. Lagatsky V. G. Shcherbitsky V. P. Mikhailov E. Heumann T. Jensen A. Diening G. Huber 《Applied physics. B, Lasers and optics》1997,64(4):409-413
Room temperature cw laser action of Yb3+-doped KY(WO4)2 and KGd(WO4)2 crystals at 1.025 μm and Er, Yb : KY(WO4)2 at 1.54 μm has been demonstrated under pumping by both Ti-sapphire laser and InGaAs laser diodes. A slope efficiency of Yb-lasers
up to 78% has been obtained.
Received: 19 June 1996 相似文献
20.
S. Chénais F. Druon F. Balembois G. Lucas-Leclin P. Georges A. Brun M. Zavelani-Rossi F. Augé J.P. Chambaret G. Aka D. Vivien 《Applied physics. B, Lasers and optics》2001,72(4):389-393
We demonstrate that Yb-doped Ca4GdO(BO3)3 (GdCOB) crystals are suitable for the development of high-power diode-pumped lasers emitting at around 1.04 μm. A 15%-doped
Yb:GdCOB crystal was longitudinally pumped with a cw fiber-coupled diode emitting 10 W at 976 nm. While 5.2 W of diode power
was absorbed, we obtained 3.2 W of 1043-μm laser light, with a beam quality factor M2 equal to 3, and 2.5 W in a diffraction-limited beam. Furthermore, the laser is continuously tunable between 1018 and 1086 nm.
Thermal effects have been investigated with a Shack–Hartmann wavefront analyser: although thermal lensing is not negligible,
it does not affect the performance of the laser with the resonator design we used.
Received: 1 August 2000 / Revised version: 18 September 2000 / Published online: 21 February 2001 相似文献