Long-wavelength VCSEL based semiconductor laser
spectroscopy in 1200-2000 nm spectral range
Project no. PF 049
Activies in the framework of the project
Spectrometer Bruker IFS 120 HR
Svatopluk Civiš and Vladislav Chernov
Description: Five-days seminar for the employees of the J. Heyrovsky Institute of Physical Chemistry of the ASCR, v. v. i. and university students on the topic "Spectrometer Bruker IFS 120 HR" (April 20 - 22, 2011 and May 17 - 18, 2011).
Target: This activity was focused on the presentation of the unique method of the time resolved and time unresolved measurement of absorption and emission spectra in infrared, visible and UV ranges using modified spectrometer Bruker IFS 120 HR. This arrangement is used only on several scientific facilities (Japan, USA and Czech Republic).
Time Schedule
Day no. 1 - Study of emission characteristics of diod laser under different physical conditions
Day no. 2 - Measurement of methane, ammonia and formaldehyde absorption spectra
Day no. 3 - Combination of diode laser absorption spectroscopy method (DLS) with the Fourier transform spectrometry (FTS)
Day no. 4 - Measurement of gases with the environmental importance (N2O, NO, NO2, HF, CO and C6H6)
Day no. 5 - VCSEL lasers as sources of radiation for the FT spectrometry
Scientific Report on Bruker IFS 120 and 125 HR
Presentation of students Martin Ferus and Petr Jelínek during the excursion to our laboratory.
List of participants G ( 20.4. – 22.4.2011)
List of participants VŠ ( 20.4. – 22.4.2011)
List of participants G (17.5. – 18.5.2011)
List of participants VŠ (17.5. – 18.5.2011)
E. Kapon a S. Civiš, V. Chernov
Target: Introduction of VCSEL techniques and measurements to scientists. It is an unique technology which is used only by several laboratories (e.g. Japan, USA). Our Swiss partner is the only laboratory dealing with this technique in Europe.
Time Schedule
Day no. 1 - VCSE lasers for photoacoustic detection.
Day no. 2 - The comparison of the VCSEL measurement results with spectroscopic databases (HITRAN).
Day no. 3 - Acquisition of the time resolved spectra.
Day no. 4 - Absorption spectra of unstable species.
Day no. 5 - Molecular dynamics of reaction an collision processes in plasma.
Special Lecture of the Guest Speaker
Eli Kapon
Developments in Long-Wavelength VCSELs for Telecommunications and Sensing Applications
Department of Theoretical Chemistry, Department of Spectroscopy
Laboratory of Physics of Nanostructures, EPFL Lausanne, Switzerland
ABSTRACT
Long wavelength (1200-2000nm) vertical cavity surface emitting lasers (VCSELs) are the diode laser of choice for many applications requiring low power-consumption, single frequency emission spectrum, broad wavelength tenability, and symmetric beam shapes. These include optical fiber communication, spectroscopy and sensing. The major difficulty in the technological development of these lasers has been the incompatibility of the optimal laser gain material (InP-based) and mirror material (GaAs-based) in terms of epitaxial growth. This talk will review progress in the use of wafer fusion in fabricating such long wavelength VCSELs. The lasing characteristics of these devices, relevant to their applications in gas sensing, will be presented and discussed.
Eli Kapon´s Lecture in the Lecture-Hall of the J. Heyrovský Institute.
Target: Detail introduction of laboratory work with VCSE lasers to scientists (preparation of material and laboratory equipment, adjustment of optics).
Practical measurement of the VCSEL emission characteristics.
Report on Gas Absorption and VCSEL Emission Spectra Study
Target: Detail introduction of laboratory work with VCSE lasers to scientists (preparation of material and laboratory equipment, adjustment of optics).
Activity no. 5
Practical Application of VSCEL Lasers
E. Capon, A. Sirbu, V. Iakovlev, S. Civiš and V. Chernov
Target: Optimalisation of the measurement results which were gained using the VCSE lasers. Result modelling for the involved institutions (ministries, companies etc.).
Practical presentation of the VCSEL lasers assembly.
Target: Familiarization with the material and technical background of the Swiss partner, methods of propagation of the results, models of cooperation with the private sector, familiarization to new instruments which could be used by J.H. Inst. in the future.
Target: Introduction of the laser technique and five-days practical course in physics for secondary school teachers (August 14 - 19, 2011).
Svatopluk Civiš
Time Resolved Infrared Emission FT Spectroscopy and its Application on Pulsed Discharges and Laser Ablation of Metals
Talk of Svatopluk Civiš about FT Spectroscopy.
S. Civiš and V. Chernov
Target: Detail introduction of laboratory work with VCSE lasers to scientists (preparation of material and laboratory equipment, adjustment of optics).
Praktická přednáška o uspořádání laserů VCSE a spektrometru Bruker IFS 125.
Target: Introduction of VCSEL techniques and measurements to scientists.
Special Lecture of the Guest Speaker
Eli Kapon
Site- and Heterostructure-Controlled Quantum Dot Systems for Nanophotonic
Applications
Department of Theoretical Chemistry, Department of Spectroscopy
Laboratory of Physics of Nanostructures, EPFL Lausanne, Switzerland
ABSTRACT
Incorporation of semiconductor quantum dots into nanophotonic elements requires requires precise spatial and spectral matching between the quantum dots and the optical modes concerned. We review recent progress towards such integration with epitaxial growth on patterned substrates. Applications in ultra-low power lasers and sources of single- and entangled photons are presented and discussed.
