Temat: quantum cascade lasers

Skocz do pozycji: 1.

Tytuł:: GaAs/AlGaAs (~9.4 žm) quantum cascade lasers operating at 260 K
Autorzy:: Bugajski, M.
Kosiel, K.
Szerling, A.
Kubacka-Traczyk, J.
Sankowska, I.
Karbownik, P.
Trajnerowicz, A.
Pruszy, E.
Pierciński, K.
Pierścińska, D.
Tematy:: quantum cascade lasers
pulsed mode; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200656.pdf Link otwiera się w nowym oknie
Opis:: The fabrication of Quantum Cascade Lasers (QCLs) emitting at 9.4 um is reported. The devices operated in pulsed mode at up to 260 K. The peak powers recorded in 77 K were over 1 W, and the slope efficiency 0.5–0.6 W/A per uncoated facet. This has been achieved by the use of GaAs/Al0.45Ga0.55As heterostructure, with 3QW anticrossed-diagonal design originally proposed by Page et al. [1]. Double plasmon planar confinement with Al-free waveguide has been used to minimize absorption losses. The double trench lasers were fabricated using standard processing technology, i.e., wet etching and Si3N4 for electrical insulation. The QCL structures have been grown by Molecular Beam Epitaxy (MBE), with Riber Compact 21T reactor. The stringent requirements – placed particularly on the epitaxial technology – and the influence of technological conditions on the device structure properties are presented and discussed in depth.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: MOVPE Technology of Fe-Compensated InP Layers for the Quantum Cascade Laser Applications
Autorzy:: Badura, Mikołaj
Tematy:: MOVPE technology
optoelectronics
quantum cascade lasers
epitaxy; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/226294.pdf Link otwiera się w nowym oknie
Opis:: Quantum cascade laser is one of the most sophisticated semiconductor devices. Its technology requires extremely high precision and layers quality. Device performance is limited by thermal extraction form laser core. One of solutions is to apply highly resistivity epitaxial material acting as insulating layer on top of the QCL. Present work describes consequent steps of elaboration of MOVPE technology of Fe-compensated InP layers for further applications in quantum cascade lasers.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: The influence of quantum well and barrier thicknesses on photoluminescence spectra of InGaAs/AlInAs superlattices grown by LP-MOVPE
Autorzy:: Łozińska, Adriana
Badura, Mikołaj
Bielak, Katarzyna
Ściana, Beata
Tłaczała, Marek
Tematy:: photoluminescence
quantum cascade lasers
MOVPE
metalorganic vapour phase epitaxy; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174236.pdf Link otwiera się w nowym oknie
Opis:: In the presented work, the influence of the quantum well and barrier thicknesses on optical characteristics of InGaAs/AlInAs superlattices was reported. Six different structures of In_0.53Ga_0.47As/Al_0.48In_0.52As superlattices lattice-matched to InP were grown by low pressure metal organic vapour phase epitaxy (LP-MOVPE). Optical properties of the obtained structures were examined by means of photoluminescence spectroscopy. This technique allows quick, simple and non-destructive measurements of radiative optical transitions in different semiconductor heterostructures.The analysis of recorded photoluminescence spectra revealed the influence of the quantum well and barrier thicknesses on the emission line energy.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: Zautomatyzowany system do pomiaru parametrów energetycznych kwantowych laserów kaskadowych
Automated system for measuring Quantum Cascade Laser parameters
Autorzy:: Mikołajczyk, J.
Wojtas, J.
Prokopiuk, A.
Krzysiak, H.
Bielecki, Z.
Tematy:: kwantowe lasery kaskadowe
metrologia
optoelektronika
quantum cascade lasers
metrology
optoelectronics; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/157814.pdf Link otwiera się w nowym oknie
Opis:: W pracy omówiono system pomiarowy, który jest przeznaczony do badań kwantowych laserów kaskadowych. Lasery te stanowią kolejny etap w rozwoju technik optoelektronicznych związanych np. ze spektroskopią lub łącznością optyczną w otwartej przestrzeni. Istotnymi elementami pracy są zaimplementowane procedury wyznaczenia parametrów laserów np. sprawności czy temperatur charakterystycznych. W części eksperymentalnej przedstawiono wyniki badań przykładowego lasera firmy Alpes Lasers S.A.
Quantum cascade lasers (QC lasers) are very promising radiation sources in some optoelectronic techniques operating at the infrared and THz spectra. The lasers can be applied in many science areas and life fields e.g. spectroscopy or free-space optical communications. Progress in QC lasers technology contributes to the continuous improvement of their performances. But this developing process also requires the testing of each laser structure. One of the most important research tasks was to measure temperature characteristics of the light-current-voltage and to determine the threshold current, the slope efficiency or characteristic temperatures. The paper presents a measurement system for investigating some QC laser parameters using specialized equipment such as: a precision current driver,a temperature controller with laser housing, an optical power meter and a detection module (Fig. 4). Important features of the system are the implemented procedures for pulse shape acquisition and determination of the main performance of QC lasers. There are also listed the main requirements for both ranges and methodologies of the measured signals. Using a resistor and a laser diode (650 nm), preliminary studies were performed to verify operation of the measuring system (Figs. 5 and 6). In the main part of the paper the measurements results of the QC laser sample produced by Alpes Lasers SA are presented (Fig. 7). In the conclusions a brief description of the system performances and directions for its further development are given.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Compact QCL driver for free-space transmitter
Autorzy:: Mikołajczyk, J.
Garlińska, M.
Wesołowski, M.
Wojtas, J.
Bielecki, Z.
Tematy:: free space optics
laser communication
quantum cascade lasers
laser driver; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/201659.pdf Link otwiera się w nowym oknie
Opis:: The paper presents investigations of a free space optical transmitter operating with quantum cascade lasers. The main goal of the research was to determine influence of lasers driver parameters on an optical data link performance. Using some commercial driving devices, the laser pulse limitations of power, repetition rate and time duration have been observed. In the paper, the preliminary results of the designed laser driver are described. The driver was developed at the Institute of Optoelectronics, MUT in cooperation with scientists from the Faculty Electrical Engineering, WUT. It is characterized by high current efficiency, high pulse repetition rate, and compact construction. Additionally, the driver also includes a controller of Peltier modules
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: Optical Wireless Communications Operated at Long-Wave Infrared Radiation
Autorzy:: Mikolajczyk, Janusz
Szabra, Dariusz
Prokopiuk, Artur
Achtenberg, Krzysztof
Wojtas, Jacek
Bielecki, Zbigniew
Tematy:: optical wireless communication
free space optics
quantum cascade lasers
optoelectronics
telecommunications; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/226104.pdf Link otwiera się w nowym oknie
Opis:: This paper presents some construction analysis and test results of a Free Space Optics system operating at the wavelength of 9.35 μm. In the system, a quantum cascade laser and a photoreceiver with mercury cadmium telluride photodetectors were used. The main parameters of these elements were discussed taking into account a data link operation. It also provides to determine a data range for various weather conditions related to scattering and scintillation. The results of numerical analyses defined the properties of currently available FSO technologies working in the near infrared or in the short infrared range of spectrum versus the performances of the developed system. The operation of this system was verified in three different test environments. The obtained results may also contain important issues related to the practical application of any FSO system.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: Zastosowanie laserów kaskadowych do wykrywania śladowych zanieczyszczeń gazowych atmosfery
Application of cascade lasers to detection and monitoring of trace contaminants in gas atmosphere
Autorzy:: Miczuga, M.
Pietrzak, J.
Kopczyński, K.
Owczarek, R.
Tematy:: kwantowe lasery kaskadowe
wykrywanie zanieczyszczeń atmosfery
monitorowanie zanieczyszczeń atmosfery
ochrona środowiska
quantum cascade lasers
infrared radiation
detection of air pollutants
monitoring of the air pollutants
environment protection; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/155281.pdf Link otwiera się w nowym oknie
Opis:: Spektroskopowe systemy detekcji gazów, w których jako źródła promieniowania IR wykorzystuje się kwantowe lasery kaskadowe, są coraz powszechniej wykorzystywane do monitorowania poziomu zanieczyszczenia atmosfery gazami przemysłowymi. W pracy omówiono system wykrywania i monitorowania poziomu amoniaku w atmosferze. System charakteryzuje się dużą czułością umożliwiającą wykrywanie i monitorowanie amoniaku o stężeniu w powietrzu na poziomie pojedynczych ppb.
Spectroscopic gas detection systems, in which quantum cascade lasers are used as IR radiation sources, are increasingly being applied to monitoring the level of air pollution by industrial gases. These systems allow the detection and long-term monitoring of toxic gases in the atmosphere, the minimum concentration of which may be equal to a single ppt. The paper describes a system capable to detect and monitor the level of ammonia in the atmosphere. In this measuring system the advantages of a quantum cascade laser and spectroscopic detection methods are combined. Its main components are: a quantum cascade laser and a multipath cell. Operation of the system is exemplified by monitoring the natural level of ammonia in the ambient air. The paper presents the advantages of using cascade lasers in detection systems of gaseous pollutants. The first section discusses the construction of the system and presents the block diagram (Fig. 1). The second section contains the results of the studies of natural concentration of ammonia in the ambient air (Fig. 3). Based on these results, it was found that the system has a high sensitivity sufficient to detect a concentration of ammonia in the air at the level of individual ppb. It also allows continuous, long-term monitoring of the concentration of this gas in the air. The sensitivity of the system depends mainly on the optical path used in the multiple-pass cell and the power of the cascade laser beam.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 8.

Tytuł:: The role of photoluminescence excitation spectroscopy in investigation of quantum cascade lasers properties
Autorzy:: Wójcik-Jedlińska, A.
Gradkowski, K.
Kosiel, K.
Bugajski, M.
Tematy:: lasery
AlGaAs
lasery kaskadowe
fotoluminescencja
modelowanie numeryczne
spektroskopa
lasers
Quantum Cascade Laser (QCL)
photoluminescence
numerical simulations
spectroscopy; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Elektronowej
Powiązania:: https://bibliotekanauki.pl/articles/378431.pdf Link otwiera się w nowym oknie
Opis:: The properties of quantum cascade laser (QCL) structures have been investigated by optical technique based on spontaneous emission measurements: photoluminescence excitation (PLE) spectroscopy. Three types of test structures used for obtaining final QCL device were examined , i.e., single sequence of coupled quantum wells, which form an active region of the device, 30 sequences of this active region separated by 25 nm thick AlGaAs barriers and finally complete, undoped structure consisting of 30 of sequences repeated active regions and superlattice injectors. The results has been compared with numerical simulations. The role of such measurements has also been discussed.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Informacja

Wyszukujesz frazę "quantum cascade lasers" wg kryterium: Temat