Infrared Physics & Technology

Items from 1 to 20 out of 2,654 results

article

Potential of modern CO ₂ -lasers for industrial applications

Helmut Hügel

Infrared Physics and Technology > 1995 > 36 > 1 > 145-157

New laser systems, such as diode-pumped solid state lasers and--in the future--diode lasers will become alternatives to CO ₂ -lasers in some fields of applications. For this reason, it is necessary to fully exploit the potential of the CO ₂ -laser. Properties like high beam quality and linear polarization, as well as techniques to handle the beam can substantially contribute to an...

article

IR laser chemistry

Martin Quack

Infrared Physics and Technology > 1995 > 36 > 1 > 365-380

Recent progress in IR laser chemistry is reviewed with stress on the conceptual background and experimental advances from our research group. In particular we discuss various experimental schemes in laser chemistry as related to thermal reactions and ordinary photochemistry, and new results in time and frequency resolved kinetic IR spectroscopy at the limit defined by the uncertainty relation. The...

article

New results about the efficiency problem of cw optically pumped FIR lasers

A. Harth

Infrared Physics and Technology > 1995 > 36 > 1 > 123-132

The reasons for the low efficiency of cw optically pumped FIR lasers are investigated theoretically and experimentally. A theoretical efficiency model was developed that allows for nonuniform spatial distributions of the pump and laser intensity. Furthermore power broadened pump absorption and diffusion of heat and molecules are included. The experimental work comprises measurements of the FIR...

article

Trace gas monitoring by laser-photoacoustic spectroscopy

M. W. Sigrist

Infrared Physics and Technology > 1995 > 36 > 1 > 415-425

Photoacoustic spectroscopy (PAS) with tunable IR lasers represents a promising tool for trace gas monitoring. The principles of PAS applied to multicomponent gas mixtures are briefly outlined. We present three photoacoustic (PA) systems and discuss typical results. A CO laser PA system has been applied to the selective analysis of volatile organic compounds (VOCs) in motor vehicle exhausts and...

article

Picosecond co ₂ laser for relativistic particle acceleration

I. Pogorelsky, I. Ben-Zvi, W. D. Kimura, N. A. Kurnit, more

Infrared Physics and Technology > 1995 > 36 > 1 > 341-354

A table-top 20-GW 50-ps CO ₂ laser system is under operation at the Brookhaven Accelerator Test Facility. We compare laser performance with model predictions. Extrapolations suggest the possibility of compact terawatt CO ₂ laser systems suitable as laser accelerator drivers and for other strong-field applications. Latest progress on an Inverse Cherenkov Laser Accelerator experiment...

article

Diode-pumped IR solid-state lasers

W. Lüthy, H. P. Weber

Infrared Physics and Technology > 1995 > 36 > 1 > 267-272

The possibilities of construction and application of laser diode-pumped solid-state lasers are described. The wavelength of the most powerful available diodes is well suited for the excitation of trivalent rare earth ions such as Nd ³ ⁺ , Tm ³ ⁺ and Er ³ ⁺ in crystal or glass hosts. The resulting emission of the solid-state lasers is suitable for metal machining...

article

Ir laser chemical processing of metal salts for preparation of oxides and metal-containing layers

Rodica Alexandrescu, C. Popescu, I. Morjan, I. Voicu, more

Infrared Physics and Technology > 1995 > 36 > 1 > 1-13

The chemical processing of metal salts by the help of IR laser radiation is often investigated using a thermochemical approach, in which the strong localized action of the laser beam imposes the characteristics of the process. High-temperature gradients induced in high-absorptivity salts are leading to specific morphologies and stoichiometries of the obtained oxides. A comparison between controlled...

article

Turbulence-noise in infrared lidar sensing

E. S. Ferdinandov, V. I. Tsanev, B. O. Todorov

Infrared Physics and Technology > 1995 > 36 > 1 > 105-111

An analytical description of the laser location (lidar) systems for investigation of two-dimensional distributions of the scattering properties of aerosol fields (natural or anthropogenic) in the infrared range has been made on the basis of the heuristic concept for the influence of the atmospheric turbulence (AT) on the transverse spatial structure of optical radiations. It has been shown that the...

article

Design of eye-safe yag:TmCrHo pulsed laser and study of its radiation absorption by molecular gases and air

Yu. N. Ponomarev, I. S. Tyryshkin, B. G. Ageev

Infrared Physics and Technology > 1995 > 36 > 1 > 355-363

The design of a frequency tunable pulsed YAG:TmCrHo-laser is described. The laser line half-width is less than 0.09 cm ^- ¹ . The tuning of laser frequency is achieved by using the temperature controlled quartz Fabry-Perot interferometer as an output mirror. The determined width of the tuning spectral interval near 2.08 μm is of about 2 cm ^- ¹ . The absorption of YAG:TmCrHo-laser...

article

IR lasers as tools for the future

Gerd Herziger, Rolf Schloms

Infrared Physics and Technology > 1995 > 36 > 1 > 401-406

article

Mode fine structure of the p-Ge intervalenceband laser measured by heterodyne mixing spectroscopy with an optically pumped ring gas laser

E. Bründermann, H. P. Röser, A. V. Muravjov, S. G. Pavlov, more

Infrared Physics and Technology > 1995 > 36 > 1 > 59-69

Heterodyne mixing of the far infrared p-Ge intervalenceband pulse laser and the optically pumped continuous wave ring gas laser at 117.7 μm (CH ₂ F ₂ ), 118.8 μm (CH ₃ OH) and at 184.3 μm (CH ₂ F ₂ ) revealed the p-Ge laser mode fine structure with a resolution below 1 MHz, the absolute mode linewidth and a mode tunability of 25 MHz during the p-Ge laser pulse...

article

IR laser photothermal trace gas detection applied to environmental and biological problems

H. S. M. de Vries, M. R. van Lieshout, F. J. M. Harren, J. Reuss

Infrared Physics and Technology > 1995 > 36 > 1 > 483-488

The photothermal effect is utilized for the detection of molecular trace gases in the open air, with high spatial and temporal resolution. An IR CO ₂ laser is used to excite specific molecules to higher vibrational levels. The subsequent change in temperature and refractive index is monitored by the deflection of a HeNe laser beam which crosses the CO ₂ laser beam. To improve the...

article

Measurement of soft mode damping in SrTiO ₃ by FIR surface waves

V. Vaičikauskas

Infrared Physics and Technology > 1995 > 36 > 1 > 475-482

The results of investigation of low-frequency modes in SrTiO ₃ crystals by FIR surface electromagnetic waves (SEW) are presented. Amplitude and phase spectroscopy methods, including SEW heterodying for the complex SEW refraction index n _e _f measurements at temperatures of 80-300 K were applied. The SEW method appears to be convenient for the soft mode (SM) frequency and damping...

article

Intraline tunable CO ₂ waveguide lasers and applications in high resolution spectroscopy

Ari Ólafsson, Jes Henningsen

Infrared Physics and Technology > 1995 > 36 > 1 > 309-319

Although early publications on the CO ₂ waveguide laser reported tuning ranges close to and exceeding 1 GHz in individual laser lines, this potential has not been widely exploited for spectroscopy. In this paper we outline the difficulties which have hampered spectroscopic applications, and we point out their theoretical background and the avenues for solution. Following this, we review the...

article

FIR microscopy

Fritz Keilmann

Infrared Physics and Technology > 1995 > 36 > 1 > 217-224

Focusing elements for FIR radiation are evaluated for their potential use in microscopy. We find that metallic waveguides offer the possibility of sub-micrometer resolution. We report new results on single-mode metal waveguide for CO ₂ laser beams. Further we demonstrate microscopy of finely structured semiconductor objects with sub-wavelength resolution, obtained with tapered coaxial metal...

article

Distributed feedback lasers and solitons

F. K. Kneubühl, J. Feng

Infrared Physics and Technology > 1995 > 36 > 1 > 237-243

In this paper we make a short comment on the theory of distributed-feedback lasers and its relation to solitary waves and solitons in passive and active periodic nonlinear media without and with cw or pulsed gain. Recent results on in-gap solitons and out-gap solitary waves as well as the effect of pulsed gain in an otherwise passive periodic nonlinear Kerr medium are illustrated.

article

Analytic solutions for dynamics of multilevel molecular systems excited by IR laser radiation

V. Savva

Infrared Physics and Technology > 1995 > 36 > 1 > 381-386

A method for obtaining exact solutions of the equations of dynamics of these systems has been presented. It is based on the use of integral transformation and orthogonal polynomials. Connection of polynomials with multilevel systems has been obtained. Natural classification of multilevel quantum systems is proposed. The examples of solutions for various systems have been presented.

article

CO ₂ laser response to loss perturbation near period-doubling

Ramón Corbalán, Jordi Cortit, Viacheslav N. Chizhevsky, Alexander N. Pisarchik

Infrared Physics and Technology > 1995 > 36 > 1 > 71-79

The response of a CO ₂ laser with losses modulated at frequency Ω to a loss perturbation of frequency Ω/2 as well as the response at the idler frequency is investigated experimentally and numerically near the onset of a period-doubling bifurcation under conditions in which the relaxation oscillation frequency of the CO ₂ laser is larger than Ω. Strong amplification of the perturbation...

article

Nonlinear propagation effects in FIR optically pumped amplifiers

J. S. Bakos, G. P. Djotyan, Zs. SÖrlei, J. Sárközi

Infrared Physics and Technology > 1995 > 36 > 1 > 25-36

The nonuniform pump intensity distribution perpendicular to the propagation direction causes an index of refraction and gain inhomogeneity of the medium with signal frequency dispersion, for instance, in the amplifier type of optically pumped lasers. The resulting waveguiding and gain focusing caused gain line distortion, which is investigated experimentally and theoretically in a methanol model...

article

Noble gas pressure broadening in the ν ₁ and ν ₃ band of SO ₂ studied with IR tunable diode laser spectroscopy

B. Sumpf, O. Fleischmann, J. Waschull, Y. Heiner, more

Infrared Physics and Technology > 1995 > 36 > 1 > 439-445

Detailed investigations of the pressure broadening of SO ₂ for collisions with the noble gases He, Ne, Ar and Kr are presented. The broadening coefficients of 14 lines in the ν ₁ band near 1151 cm ^- ¹ (13 J 44, 3 K _a 19) and 8 lines in the ν ₃ band near 1361 cm ^- ¹ (4 J , 61, 0 K _a 17) were determined using a tunable...

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INFRARED (121)
INFRARED THERMOGRAPHY (89)
INFRARED DETECTOR (60)
QWIP (51)
THERMOGRAPHY (46)
IMAGE FUSION (41)
DARK CURRENT (38)
INFRARED DETECTORS (36)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 85.60.GZ (34)
INFRARED IMAGING (33)
INFRARED IMAGE (32)
THERMAL IMAGING (32)
INFRARED SPECTROSCOPY (29)
MOLECULAR BEAM EPITAXY (29)
OPTICAL PROPERTIES (27)
HGCDTE (26)
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IMAGE PROCESSING (25)
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PHOTODETECTOR (21)
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TEMPERATURE (19)
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MID-INFRARED (18)
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FPA (17)
FTIR (16)
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NONUNIFORMITY CORRECTION (13)
POLARIZATION (13)
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REFLECTANCE (13)
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IMAGING (12)
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[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 07.57.KP (9)
CO 2 LASER (8)
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INFONA - science communication portal

Infrared Physics & Technology

Potential of modern CO ₂ -lasers for industrial applications

IR laser chemistry

New results about the efficiency problem of cw optically pumped FIR lasers

Trace gas monitoring by laser-photoacoustic spectroscopy

Picosecond co ₂ laser for relativistic particle acceleration

Diode-pumped IR solid-state lasers

Ir laser chemical processing of metal salts for preparation of oxides and metal-containing layers

Turbulence-noise in infrared lidar sensing

Design of eye-safe yag:TmCrHo pulsed laser and study of its radiation absorption by molecular gases and air

IR lasers as tools for the future

Mode fine structure of the p-Ge intervalenceband laser measured by heterodyne mixing spectroscopy with an optically pumped ring gas laser

IR laser photothermal trace gas detection applied to environmental and biological problems

Measurement of soft mode damping in SrTiO ₃ by FIR surface waves

Intraline tunable CO ₂ waveguide lasers and applications in high resolution spectroscopy

FIR microscopy

Distributed feedback lasers and solitons

Analytic solutions for dynamics of multilevel molecular systems excited by IR laser radiation

CO ₂ laser response to loss perturbation near period-doubling

Nonlinear propagation effects in FIR optically pumped amplifiers

Noble gas pressure broadening in the ν ₁ and ν ₃ band of SO ₂ studied with IR tunable diode laser spectroscopy

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