Temat: 42.60.Da - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Using 2D Distributed Feedback in Optical Laser
Autorzy:: Baryshev, V. R.
Ginzburg, N. S.
Malkin, A. M.
Sergeev, A. S.
Tematy:: 42.55.Tr
42.60.Da; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2047847.pdf Link otwiera się w nowym oknie
Opis:: Dynamics of a laser exploiting two-dimensional distributed feedback is considered. Two-dimensional distributed feedback can be realised using a dielectric structure (two-dimensional Bragg resonator) with the width having double-periodical modulation. It is shown that such a structure can provide production of spatial coherent radiation from extended active medium of planar geometry.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 2.

Tytuł:: Model of Nonlinear Operation of a Waveguide Laser with Gaussian Output Mirror
Autorzy:: Witoński, P.
Szczepański, P.
Tematy:: 42.60.Da
42.60.Lh; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2008298.pdf Link otwiera się w nowym oknie
Opis:: We present an approximate analysis of the nonlinear operation of the hollow-waveguide laser with Gaussian reflectivity profile output mirror, including gain saturation and longitudinal- as well as transverse-field distribution of the laser mode. The model presented is general and can be applied to the study of an arbitrary configuration of the waveguide laser. In particular, the laser characteristics show the influence of the position of the output mirror and the Gaussian mirror parameter on the power efficiency of the laser system. It was shown that optimal position of the output mirror, which provides maximal power efficiency (with other parameters constant), depends on output power level and the mirror reflectivity coefficient.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 3.

Tytuł:: Calculation of Temperature Distribution in Eccentric Multi Core Diode Pumped Fiber Lasers by Green Function Method
Autorzy:: Gharaati, A.
Elahi, P.
Jafari, M.
Tematy:: 42.55.Wd
42.60.Da; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1791240.pdf Link otwiera się w nowym oknie
Opis:: In this paper, the temperature distribution in fiber lasers pumped by multi diode bars located in out-of-fiber axis has been investigated semi-analytically. For this reason, we consider heat deposition in fiber lasers due to pump and the nonhomogeneous heat conduction equation has been solved by using Green function method in a cylindrical coordinate system. Our model has been used for single, double and multi pumped configuration and, for a typical fiber lasers, the results have been plotted and discussed.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 4.

Tytuł:: Asymmetry and Contradiction of Mirror Misalignments Influence of Off-Axial Cylindrical Hybrid Resonator
Autorzy:: Wang, N.
Li, X.
Zhu, H.
Tematy:: 42.55.Xi
42.60.Da
42.60.Jf; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1399267.pdf Link otwiera się w nowym oknie
Opis:: The output far-field intensity distributions of off-axial cylindrical hybrid resonator with different mirror misalignments are simulated by coordinate transformation fast Fourier-transform algorithm. The simulations showed that the mirror misalignments influence is different in anticlockwise and clockwise tilt direction. According to the calculation results, the output beam quality of off-axial unstable resonator is analyzed, from the aspects of $M^2$ value and power in the bucket curves. Furthermore, the analysis brings out an interesting contradiction that the beam quality changing evaluated by $M^2$ value is different from that by power in the bucket curves when the mirror misalignments occurred in anticlockwise direction. It demonstrated that the beam quality evaluation of off-axial unstable resonator should not be one-sided.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 5.

Tytuł:: Simulation of Modes in Terahertz Quantum-Cascade Microring and Microdisk Lasers
Autorzy:: Tamošiūnas, V.
Kancleris, Z.
Tamošiūnienė, M.
Tematy:: 42.50.Pq
42.55.Sa
42.60.Da; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1813216.pdf Link otwiera się w nowym oknie
Opis:: In our contribution, we report on finite-difference time-domain simulations of modes in microring and microdisk terahertz quantum-cascade lasers with external radii of 100 μm and less. Our simulations have revealed a possibility of low radiative loss for lowest and second order whispering gallery modes in such devices, even when the effective mode volume is reduced below the cubic wavelength.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 6.

Tytuł:: Radio Frequency Generator Using Four Wave Mixing in Cascaded Nonlinear Semiconductor Optical Amplifiers
Autorzy:: Memon, M.
Siraj, M.
Fathallah, H.
Khan, M.
Tematy:: 42.60.Da
42.60.Fc
42.65.Hw
42.79.Nv; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1398795.pdf Link otwiera się w nowym oknie
Opis:: For the last three decades, the phenomenon of four-wave mixing is a significant technique for generation of light at new distinct wavelength. When two distinct laser beams (pump and probe) beat together in a non-linear medium, few modes are increased in the power at same distance from the probe and pump, as a result of four-wave mixing. In this paper, cascading structure of two semiconductor optical amplifiers produces very strong four-wave mixing. This technique is exploited to devise a tunable radio frequency signal generator. The wavelength distance between pump and probe laser beams determines the radio frequency of the generated signal. Using this scheme, it can be observed from the experimental results, that there is an increase of more than 3 dB in signal to noise ratio at 7 Gbits/sec data rate of the 60 GHz generated mm-wave signal. Moreover, the radio frequency can be tuned to hundreds of GHz by varying the distance between the pump and probe signals. This scheme will readily serve as future all optical radars. It is also a key technique for short-range communication systems for military applications. The above scheme can also be monolithically integrated.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: Two-Channel Optoelectronic Sensor Employing Cavity Enhanced Absorption Spectroscopy
Autorzy:: Wojtas, J.
Tematy:: 07.07.Df
42.25.Dd
42.55.Px
42.60.Da
42.62.Fi; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1493278.pdf Link otwiera się w nowym oknie
Opis:: In the paper, a description of two-channel of optoelectronic sensor basing on cavity enhanced absorption spectroscopy is presented. In contrast to the typical cavity enhanced absorption spectroscopy systems, here a special optical system is applied. It provides possibility to direct more than one beam of laser radiation into a cavity. Thus, special lasers controller system and photoreceiver were developed as well. The setup includes two pulsed laser diodes. The optical signals from the lasers are registered with one special constructed photoreceiver, which is characterized by wide range of the detected wavelengths. Moreover, there was applied time division multiplexing technique, well-known in the telecommunication systems. Every laser is assigned to the suitable channel - the strictly determined temporary window. In this window, the signal from the exits of the optical cavity is registered. In the system, optical signal from many laser sources can be measured and value of absorption coefficient at a few different wavelengths can be determined parallel. Typical cavity enhanced absorption spectroscopy system is designed to measure only one gas concentration, while the developed setup provides possibility to detect a trace concentration of two gases at the same time.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 8.

Tytuł:: Adiabatic Processes in Quantum Optics
Autorzy:: Stenholm, S.
Tematy:: 03.75.-b
42.60.Da
05.60.Gg
03.65.Ge; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2030475.pdf Link otwiera się w nowym oknie
Opis:: This paper reviews the use of adiabatic approximations in quantum optics.The general principle is explained in terms of the Landau-Zener model and the recently developed stimulated Raman adiabatic passage scheme. The features characteristic of adiabatic evolution are extracted from these examples. Our recent work on adiabatic level preparation and cavity mode transfer of excitation is presented and discussed.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 9.

Tytuł:: Application of Quantum Cascade Lasers in Nitric Oxide and Nitrous Oxide Detection
Autorzy:: Wojtas, J.
Bielecki, Z.
Stacewicz, T.
Mikolajczyk, J.
Medrzycki, R.
Rutecka, B.
Tematy:: 07.07.Df
42.25.Dd
42.55.Px
42.60.Da
42.62.Fi; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1493346.pdf Link otwiera się w nowym oknie
Opis:: Application of quantum cascade lasers in NO and $N_2O$ sensor is described. Cavity enhanced absorption spectroscopy was used for this purpose. The detection was performed at vibronic molecular transitions in spectral regions of 5.23-5.29 μm and 4.46-4.54 μm for NO and $N_2O$, respectively. In order to avoid interferences by the gases contained in atmosphere $(H_2O, CO_2)$ the lines of 5.263 μm for NO and 4.530 μm for $N_2O$ were selected. Our two channel sensor is designated for simultaneous detection of both compounds. Each channel consists of single mode quantum cascade laser, optical cavity, and a photodetection module. The lasers were precisely tuned to the wavelength of interest. Optical cavities were built with spherical mirrors of high reflectance. The signals from the cavities outputs were registered with specially developed low noise detection modules.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 10.

Tytuł:: Nitrogen Oxides Optoelectronic Sensors Operating in Infrared Range of Wavelengths
Autorzy:: Wojtas, J.
Bielecki, Z.
Stacewicz, T.
Mikolajczyk, J.
Rutecka, B.
Medrzycki, R.
Tematy:: 07.07.Df
42.25.Dd
42.55.Px
42.60.Da
42.62.Fi
85.60.-q; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1399410.pdf Link otwiera się w nowym oknie
Opis:: Investigation of nitric oxide and nitrous oxide optoelectronic sensors is described. The detection of both components was done by measurement of absorption that occurs due to transition between vibronic molecular transitions. The improvement of the sensitivity was achieved due to application of cavity enhanced absorption spectroscopy. Two optical cavities (each one for each gas) built of high reflectance spherical mirrors were used. While the spectra of observed transitions are situated in mid-infrared range, two single mode quantum cascade lasers were applied. Their narrow emission lines were precisely tuned to the absorption lines of both investigated gases. The measurement of different mixtures of $Ar-NO$ and $Ar-N_2O$ within the range from 100 ppb to 10 ppm was performed. The relative uncertainty of the results did not exceed the level of 13%.
Dostawca treści:: Biblioteka Nauki

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