Infrared and far-infrared laser emissions from a TE CO2 laser pumped NH3 gas

In this paper, infrared (IR) and far-infrared (FIR) laser emissions from a TE CO₂ laser pumped NH₃ gas are reported. 8 IR laser emissions near the wavelength of 12 μm were observed by using 4 different CO₂ laser lines for the pumping. 3 IR laser emissions in P-branch of vibrational-rotational band (ν₂ → G) oscillated simultaneously in two pumping cases, i.e. pumping with the R(30) or R(16) line of 9.4 μm band from the CO₂ laser. 26 FIR laser emissions (26.45 μm ～ 281.0 μm) were observed by using 12 different CO₂ laser lines, and the 10 FIR emissions of them may be new laser emissions as far as we know.     

Real time linewidth measurement of a continuously tunable multiatmosphere TE CO2 laser

Frequency upconversion as a means of investigating the spectral characteristics of continuously tunable multiatmosphere TE CO₂ lasers has been demonstrated. Phase matched mixing in proustite of 10 μm laser radiation and the output of a single-mode Nd:YAG laser has permitted Fabry-Pérot interferograms, at the 0.96 μm sum frequency, to be recorded with the aid of a conventional image converter tube.     

Continuous tuning of a single laser mode over 5 cm-1 in a high-pressure N2O/CO2 transfer laser

Continuous tuning of a single laser mode in an optically pumped high-pressure N₂O/CO₂ transfer laser over 5 cm^-1 near 10.5 μm has been achieved. A spectrum of ethylene gas taken with this source indicates a resolution of 0.014 cm^-1.     

Optically pumped NH3 laser using a continuously tunable CO2 laser

The use of a continuously tunable CO₂ laser to optically pump the NH₃ laser via previously inaccessible absorption lines is described. Efficient laser action has thus been achieved in the 11–13 μm region on transitions formerly only obtained in buffered mixtures.     

Linear and nonlinear optical properties of Ca3(VO4)2

Single crystals of Ca₃ (VO₄)₂ have been grown by the Czochralski method. The refractive indices show that the crystals are phasematchable between 1.72 μm and 2.94 μm with favourable values for acceptance angle and spectral width of the incident laser beam in the entire phasematching range. The nonlinear optical coefficients have been measured by the Maker fringe method at a fundamental wavelength of 1.064 μm. They are comparable to those of KDP. Thus the crystals are potentially useful for frequency conversion of broadband or tunable laser sources as semiconductor and F-center lasers. They may also be installed in high f-number IR image converters.     

New FIR laser lines from an optically pumped far-infrared laser with isotopic 13C16O2 pumping

A ¹³C¹⁶O₂ laser optically pumping a FIR laser has resulted in 17 new FIR cw emissions from 78.5 μm to 917 μm. The FIR media were: CD₃OD, CH₃OD, CD₃OH, NH₃ and ¹⁵NH₃. Interesting effects have been observed with a combination of NH₃ and CD₃OD resulting in a new FIR emission. Two new FIR emissions at 181.5 μm and 355.5 μm have been observed with a ¹²C¹⁶O₂ laser optically pumping CD₃OD.     

Diode laser measurements of the band strengths of ν3 and ν6 in 12CH3D

A diode laser spectrometer has been used to measure line strengths for 143 transitions in the ν₆ fundamental band of ¹²CH₃D near 9 μm. These line-strength measurements have been used to derive a band strength for ν₆ and ν₃. The band strength derived for ν₆ is 61.7 ± 1.8 cm^?2 atm^?1, and that for ν₃ is 49.3 ± 1.4 cm^?2 atm^?1 at 395 K.     

Er3+掺杂SiO2复合的Al2O3粉末结构及光致发光特性

采用溶胶-凝胶(sol-gel)工艺制备0.1 mol% Er³⁺掺杂Al₂O₃体系和SiO₂-Al₂O₃复合体系粉末. 实验结果表明：5 mol%的SiO₂复合加入Al₂O₃抑制γ→θ和θ→α相转变. 掺0.1 mol%Er³⁺:Al₂O₃体系粉末，900℃烧结，在1.47—1.63μm波段内光致发光(PL)谱为中心波长1.53 μm、半高宽56 nm的单一宽峰，1000—1200℃烧结，劈裂为多峰PL谱. 掺0.1 mol%Er³⁺:SiO₂-Al₂O₃复合体系粉末，在高达1200℃烧结，仍保持中心波长1.53 μm的单一宽峰PL谱，由于—OH更完全的脱除，PL强度较900℃烧结Al₂O₃体系，SiO₂-Al₂O₃复合体系均提高1个数量级. 关键词： 2-Al₂O₃复合体系')" href="#">SiO₂-Al₂O₃复合体系 掺铒 溶胶-凝胶工艺 光致发光     

Vibronic laser action of V2+:CsCaF3

CW laser operation has been achieved with the vibronic solid-state material V²⁺:CsCaF₃ at 80 K. The laser is tunable between 1.24 and 1.33 μm with a potential long wavelength extension.     

One watt,far infrared CH3OH laser

Peak powers near 1 watt have been observed on the CH₃OH laser line at 570.5 μm as well as on each of three new CH₃OH laser lines produced by pumping a far infrared guided wave cavity with a 0.5 MW helical CO₂-TEA laser. The new lines have wavelengths of 58.1, 65.1 and 451.9 μm. For all four lines the optimum CH₃OH pressure was between 2.3 and 3 torr, and laser action at 65.1 μm persisted up to a pressure in excess of 9 torr.     

Polarization enhancement of anti-Stokes emission in a para-H2 Raman laser

The effect of polarization can influence the frequency conversion and enhance the anti-Stokes emission in a rotational para-H₂ Raman laser. Stokes (16 μm) and anti-Stokes (7 μm) radiations were obtained from a line tunable CO₂ laser at 10 μm.     

High energy density NH3 laser using an unstable resonator CO2 laser pump

The design and operation of a novel optically pumped molecular gas laser cell, which uses geometrical coupling and is compatible with high energy unstable resonator CO₂ laser pump beams, is described. The attainment of high energy output densities (>0.5J$\text{e}$?1>^-1) from the 12.08 μm and 12.81 μm NH₃ laser transitions using this pumping arrangement is reported.     

Investigation on optical transmission spectra of (1−x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 single crystals

The optical transmission spectra from 0.3 to 11 μm of relaxor ferroelectric single crystals (1−x)Pb(Mg_1/3Nb_2/3)O₃-xPbTiO₃ (PMN-xPT) were systematically studied at room temperature in this paper. The crystal is transparent between 0.45 and 5.5 μm and becomes completely absorbing around 0.4 μm in near UV region and 10 μm in infrared region. But the wavelength cutoff in near UV is much sharper than the long wavelength cutoff. As compared with other configurations, tetragonal single crystals possess the optimal transmission properties. The optical transmittance in the wavelength region from 0.45 to 5.5 μm is about 70%. The results show that tetragonal PMN-xPT single crystals are promising for a wide range of optical applications. Some discussions about the oxygen-octahedra structure that determines the basic energy level of the crystals are also presented on the optical properties of PMN-xPT single crystals.     

铌酸钡钠和钽酸锂铁电相变的实地观察

本文报道了用透射电子显微镜实地观察铌酸钡钠和钽酸锂铁电相变的实验结果。在室温电畴的尺寸为0.2—1μm。当温度增加到接近居里点时,形成准规则排列的微畴结构,其尺寸为几百埃,实验结果用稍微修正了的模型进行了解释。在钽酸锂中当接近铁电相变温度时,发现了强烈的辐照损伤,这可能跟相变的软模有关。 关键词：     

Absorption of CO2 laser pulses at different wavelengths by ground-state and vibrationally heated SF6

The absorption of CO₂ laser pulses by low pressure SF₆ gas has been investigated over a wide range of energy fluxes. For laser energy fluxes of 0.01–1 J cm^-2 the effective absorption cross section varies between 0.2 and 2 × 10^-18 cm². For each laser line an individual dependence on the energy is found and in some cases minor changes in the absorption behaviour seem to occur around 0.1 J cm^-2. SF₆ excited with an average vibrational energy content of up to 20 photons/molecule does not absorb measurable amounts of 9.4 μm laser light. The influence of various SF₆ and Ar pressures on the temporal shape of the transmitted pulses has been investigated.     

Optically pumped submillimeter laser lines from CD2Cl2 using a large tunability CW CO2 laser

Twenty-five new laser lines have been obtained in the wavelength region from 155 to 830 μm by optically pumping the CD₂Cl₂ (deuterated dichloromethane) molecule with a CW CO₂ laser having a tunability range of 300 MHz. The wavelength, polarization relative to that of CO₂ pumping radiation, and offset relative to the CO₂ center frequency were determined for all of the new lines and some other already known laser emissions. For all of them we give also the relative intensity and the optimum pressure of operation. Permanent address: Depto de Física e Química da FEIS — UNESP 15.378-000 Ilha Solteira-SP, Brazil     

Up-conversion of CO laser lines by difference-frequency mixing in proustite (Ag3AsS3)

Phase-matched cw up-conversion of CO laser radiation has been obtained in proustite (Ag₃AsS₃). The wavelength of the up-converted radiation varied from 0.69 to 0.72 μm. Detailed data on the phase-matching angles are given.     

Observation of superfluorescent emission of the B-X system in I2

Transient superfluorescent emission has been observed on the I₂ (B-X) system when I₂ was pumped by a broadband pulsed dye laser. Emission was observed from 1.1–1.3 μm for pump wavelengths in the range 510–600 nm.     

Single-mode optical pumping and superradiant emission in D2O and CH3F

Superradiant FIR emission in both D₂O and CH₃F has been investigated using a tunable single-mode CO₂ TEA laser as optical pump, and results compared with multimode pumping. The frequency offset of the absorbing transitions has been measured and compared to other work. Estimates of the dipole transition moments were also obtained from saturation broadening data. Fine structure of the CH₃F (Q12, K) lines have been resolved and compared with theory. High quantum conversion efficiencies were observed for several lines in D₂O: 38% (99 μm), 20% (385 μm) and 12.5% (121 μm) and in CH₃F 21% (496 μm).     

Diode-laser pumped 1.328 μm Nd:Sr5(PO4)3F miniature laser

Nd:Sr₅(PO₄)₃F, known as Nd:S-FAP, is a new material for efficient and miniature diode-laser pumped solid-state lasers. By using a laser-diode pump operating at 805.4 nm, Nd:S-FAP has been successfully lased at 1.328 μm. A slope efficiency of 33.5% and a laser threshold of 18.5 mW have been measured. The theoretical formulas for threshold power and slope efficiency were given and the theoretical estimation agreed with the experimental result.