共查询到20条相似文献,搜索用时 31 毫秒
1.
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
2.
Li D. J. Yang G. L. Chen F. Xie J. J. Zhang L. M. Guo J. Shao C. L. Peng Z. Q. Lu Q. P. 《Laser Physics》2012,22(5):937-940
Stimulated rotational Raman scattering (SRRS) at multiwavelength pumped by TEA CO2 laser was demonstrated in this paper. Raman mediums were cooled by liquid-N2 and a multiple-pass cell (MPC) with 25 passes was designed and used. When the para-H2 was pumped by single-longitudinal-mode
(SLM) circular polarized TEA CO2 laser on 10P(20), 9P(20), and 10R(20), 50 mJ 16.95 μm, 350 mJ 14.44 μm, and 536 mJ 16.9 μm radiations were obtained, corresponding
to energy conversion efficiency of 1.2, 11.7, and 13.4%, respectively. When the ortho-D2 was pumped by CO2 laser on 10R(18), 108 mJ 12.57 μm Raman laser was obtained with energy conversion efficiency of 2.9%. 相似文献
3.
F. Kottmann W. Amir F. Biraben C. A. N. Conde S. Dhawan T. W. Hänsch F. J. Hartmann V. W. Hughes O. Huot P. Indelicato L. Julien P. Knowles S. Kazamias Y.-W. Liu F. Mulhauser F. Nez R. Pohl P. Rabinowitz J. M. F. dos Santos L. A. Schaller H. Schneuwly W. Schott D. Taqqu J. F. C. A. Veloso 《Hyperfine Interactions》2001,138(1-4):55-60
A measurement of the 2S Lamb shift in muonic hydrogen (μ−p) is being prepared at the Paul Scherrer Institute (PSI). The goal of the experiment is to measure the energy difference
ΔE(25
P
3/2−23
S
1/2) by laser spectroscopy (λ≈6μm) to a precision of 30 ppm and to deduce the root mean square (rms) proton charge radius with
10−3 relative accuracy, 20 times more precise than presently known.
An important prerequisite to this experiment is the availability of long-lived μp2S
-atoms. A 2S-lifetime of ∼1 μs – sufficiently long to perform the laser experiment – at H2 gas pressures of 1–2 hPa was deduced from recent measurements of the collisional 2S-quenching rate. A new low-energy negative muon beam yields an order of magnitude more muon stops in a small low-density gas
volume than a conventional cloud muon beam. A stack of ultra-thin carbon foils is the key element of a fast detector for keV-muons.
The development of a 2 keV X-ray detector and a 3-stage laser system providing 0.5 mJ laser pulses at 6 μm is on the way.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
4.
We report a compact and viable source of high-efficiency, high-repetition-rate, temperature-tuning, mid-IR optical parametric
oscillator (OPO) based on periodically poled MgO-doped lithium niobate (PPMgOLN) pumped by a homemade high power AOM Q-switched
Nd:YVO4 laser centered at 1.064 μm. With an optimal plane-concave resonator configuration, average output power of 5.7 W at 2.73
μm was obtained when the pump power was 25 W at the repetition rate of 80 kHz. The conversion efficiency from the 1.064 μm
laser to the 2.73 μm laser was 22.8%. Temperature tuning of the OPO yielded a signal wavelength range from 1.67 to 1.75 μm
and an idler wavelength in the range of 2.72 to 2.92 μm. 相似文献
5.
K. Okazaki S. Torii T. Makimura H. Niino K. Murakami D. Nakamura A. Takahashi T. Okada 《Applied Physics A: Materials Science & Processing》2011,104(2):593-599
We investigated a simple and productive micromachining method of silica glass by ablation using a TEA CO2 laser (10.6 μm) with a spatial resolution down to sub-wavelength scale. The silica glass was irradiated by the TEA CO2 laser light through a copper grid mask with square apertures of 20×20 μm2 attached to the silica glass surface. After the irradiation, circular holes with a diameter of several μm were formed on
the silica glass surface at the centers of the apertures due to the Fresnel diffraction effect. The minimum diameter of the
holes was 3.4 μm. The characteristics of the micromachining are discussed based on the electric field distributions of the
CO2 laser light under the mask using a three-dimensional full-wave electromagnetic field simulation. 相似文献
6.
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
7.
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
8.
A single resonator 8.30 μm ZnGeP2 (ZGP) optical parametric oscillators (OPO) was reported in the paper. The OPO was pumped by a 10.2-W Tm,Ho:GdVO4 laser at 8 kHz in a Q-switch mode, a 170-mW idler was obtained at 8.30 μm, and the output power of the idler and signal wave
was 1.0 W, corresponding to an optical-optical conversion efficiency of 10.3% and a slope efficiency of 20.9%. Tm,Ho:GdVO4 laser was pumped by a 30-W fiber-coupled laser diode (LD) at the center wavelength of 801 nm. The output wavelength of Tm,Ho:GdVO4 laser was at 2.05 μm, and the energy per pulse of 1.28 mJ in 18 ns was achieved at 8 kHz with the peak power of 71.1 kW. 相似文献
9.
S. Banerjee K. Miyata K. Kato N. Saito S. Wada 《Applied physics. B, Lasers and optics》2007,87(1):101-103
AgGa1-xInxS2 with x=0.14±0.01 was found to be 90° phase-matchable for type-I difference-frequency generation (DFG) by mixing the dual-wavelength
pulses emitted from an electronically tuned Ti:sapphire laser. Infrared radiation continuously tunable over the range of 4.80–6.98 μm
was generated by independently varying the two wavelengths in the 705–932 nm spectral range, and 4.04 μm radiation by mixing
a Nd:YAG laser with the Ti:sapphire laser. In addition, this material was found to be noncritically phase-matchable for the
second harmonic generation (SHG) of CO2 laser radiation at 10.591 μm at 203 °C. Sellmeier equations that reproduce well these experimental data are presented.
PACS 42.65.-k; 42.65.ky 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.
S. D. Pan X. Q. Yu Z. Yan Y. Shen X. J. Lv S. N. Zhu 《Applied physics. B, Lasers and optics》2008,93(4):749-752
We present an approach to generating a tunable orange laser from 0.601 to 0.604 μm based on a quasi-periodically poled superlattice
in LiTaO3 and a Q-switched 1.064 μm Nd:YVO4 laser as pump. The orange laser was generated in a cavity by a parametric process cascaded by a frequency mixing with a maximum
output of 310 mW using 15 W pump power. 相似文献
12.
Steady state mode-locked operation of a neodymium laser operating on the 4F3/2 → 4I13/2 transition around 1.3 μm is achieved for the first time using transmitting single-walled carbon nanotube (SWCNT) saturable
absorber. The Nd:YVO4 laser cavity was optimized for large fundamental mode volume generating an average power of 0.8 W at a repetition rate of
127 MHz in a stable train of 16.5 ps long pulses. 相似文献
13.
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
14.
M. Stanislawki J. Meister T. Mitra M.M. Ivanenko K. Zanger P. Hering 《Applied physics. B, Lasers and optics》2001,72(1):115-120
The Er:YAG and the CO2 laser are competitors in the field of hard tissue ablation. The use of Er:YAG lasers (2.94 μm, pulse length
L of 100 to 200 μs) show smaller areas of thermal defects then ‘‘superpulsed’’ CO2 lasers with pulse lengths of approximately 100 μs. Only the development of a Q-switched CO2 laser (9.6 μm, τL=250 ns) allowed for similar results. In this paper new results for the Er:YAG and the Q-switched CO2 laser under the influence of water spray will be presented. Several parameters are of special interest for these investigations:
the specific ablation energy, which shows a minimum for the CO2 laser at an energy density of 9 J/cm 2 and a broad shallow minimum in the range of 10 to 70 J/cm2 for the Er:YAG laser, and comparison of the cut-shape and depth. Surface effects and cutting velocity are discussed based
on SEM pictures.
Received: 19 July 2000 / Revised version: 1 November 2000 / Published online: 30 November 2000 相似文献
15.
In this paper, we report a Tm (5.5 at %), Ho (0.55 at %):GdVO4 laser pumped by diode laser at 800 nm. To our best knowledge, it is the first time that the use of Tm (5.5 at %), Ho (0.55
at %):GdVO4 crystal among the similar experiments. We observed the influences of LD working temperature i.e. pump wavelength to 2 μm
laser conversion efficiency. In the conditions of the continuous wave and 10 kHz acousto-optic Q-switch, high efficiency output
of 2.05 μm laser was obtained. With the maximum pump power of 34.6, 13.9, and 13.6 W at 2.05 μm laser output was achieved
respectively. Single laser pulse width was 25.6 ns in 10 kHz acousto-optic Q-switched condition. 相似文献
16.
J.C.S. Moraes O.P. Pizoletto A. Scalabrin M.D. Allen K.M. Evenson 《Applied physics. B, Lasers and optics》2001,72(2):241-244
We have reinvestigated 13CH3OH as a source of far-infrared (FIR) laser emission using a CO2 laser as a pumping source. Thirty new FIR laser lines in the range 36.5 μm to 202.6 μm were observed and characterized. Five
of them have wavelengths between 36.5 and 75 μm and have sufficient intensity to be used in LMR spectroscopy. Using Fourier-transform
spectroscopic data in the infrared (IR) and FIR regions we have determined the assignment for 10 FIR laser transitions and
predict nine frequencies for laser lines which have yet to be observed.
Received: 17 July 2000 / Published online: 6 December 2000 相似文献
17.
S. Suzuki H. Yamaguchi T. Ishigaki R. Sen H. Kataura W. Krätschmer Y. Achiba 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2001,16(1):369-372
Time evolution of emission by carbon nanoparticles generated with a laser furnace technique was investigated with a high-speed
video camera. Assuming blackbody radiation formula for small spherical particle, the internal temperature of these carbon
nanoparticles was determined as a function of time delay (Δt) after laser vaporization. It was found that the internal temperature of them drastically decreased at Δt < 400μs through collision with the surrounding rare gas inside the furnace. On the other hand, in particular laser vaporization
condition where yields of C60 and other higher fullerenes in the soot were found to be high, an increase in the blackbody emission intensity could be recognized
for longer wavelength ( 660 < λ < 830 nm) at Δt > 400μs. This finding suggests that a certain exothermic process related to the formation of C60 and other higher fullerenes should occur at Δt > 400μs inside the furnace. 相似文献
18.
G. Durry N. Amarouche L. Joly X. Liu B. Parvitte V. Zéninari 《Applied physics. B, Lasers and optics》2008,90(3-4):573-580
The 2.7 μm spectral range is highly suitable for the in situ monitoring of atmospheric H2O using compact balloonborne laser diode spectrometers. Water vapour spectroscopic parameters of the 202
101 and the 413
414 transitions of the ν3 band are revisited in this spectral region using a new distributed-feedback InGaAsSb laser diode emitting at 2.63 μm. Accurate
line strengths are provided which are well adapted for the in situ probing of the middle atmosphere. Our measurements are
thoroughly compared to an existing molecular database, laboratory measurements and ab-initio calculations. A laser hygrometer
was developed for operation from small stratospheric balloons using this new laser diode technology, with emission at 2.6 μm.
The realized sensor is described and results from a recent test-flight are reported.
PACS 07.57.Ty; 92.60 Jq 相似文献
19.
A transversely pumped far-infrared laser cavity has been used to discover two optically pumped laser lines: the 357.7 μm line
from H2C=CF2 and the 242.3 μm line from CH3OH. Using heterodyne techniques, the frequencies of fourteen far-infrared laser emissions have been measured, six for the
first time.
PACS 07.57.Hm; 42.55.Lt; 42.62.Eh 相似文献
20.
M. H. You X. Gao Z. G. Li G. J. Liu Y. Wang L. Li M. Li Y. G. Zou B. X. Bo X. H. Wang 《Laser Physics》2011,21(3):493-495
2.2 μm InGaAsSb/AlGaAsSb Sb-based type-I laser diodes (LDs) were fabricated, with cavity lengths of 1000 μm and stripe width
of 150 μm. The high output performance was achieved with the threshold current density of the device is as low as 187 A/cm2, slope efficiency of 0.2 W/A, and vertical and parallel divergent angles ϑ⊥ = 42° and ϑ| = 10°, respectively. The continuous wave operating up to 320 mW at room temperature (RT) were achieved. 相似文献