Laboratory of Laser Spectroscopy
W. Ostwaldi 1, Tartu
The activity of Laboratory of Laser Spectroscopy is focused on the investigation of novel materials by using modern using modern possibilities of optical laser spectroscopy.
Core competence of the laboratory:
- Laser Spectroscopy
- Time resolved optical spectroscopy
- Optical spectroscopy at cryogenic temperatures (down to 1.9 K)
- Optical microspectroscopy (Raman and fluorescence)
- Single molecul spectroscopy
- Correlation spectroscopy
- Laser beam shaping
- Plasma-based synthesis of nanomaterials
- Dopeeritud ja madaladimensionaalsete anorgaaniliste materjalide optilised omadused
- Computer modelling of optical materials
Selection of publications
- Y. Orlovskii, H. Gross, E. Vinogradova, V. Boltrushko, V. Hizhnyakov, "Spectroscopic evidence of cooperative (entangled) quantum states of Nd3+ ion pairs in Nd3+: LaF3 crystal", Journal of Luminescence (2020)
- S. Heinsalu, O. Fesenko, A. Treshchalov, S. Kovalchuk, A. Yaremkevych, V. Kavelin, L. Dolgov, "Silver nanoparticles with reduced graphene oxide for surface-enhanced vibrational spectroscopy of DNA constituents",Applied Nanoscience (2019)
- Y. Orlovskii, A. Popov, E. Orlovskaya, A. Vanetsev, E. Vagapova, M. Rähn, V. Sammelselg, I. Sildos, A. Baranchikov, P. Grachev, V. Loschenov, A. Ryabova, "Comparison of concentration dependence of relative fluorescence quantum yield and brightness in first biological window of wavelengths for aqueous colloidal solutions of Nd3+: LaF3 and Nd3+: KY3F10 nanocrystals synthesized by microwave-hydrothermal treatment", Journal of Alloys and Compounds (2018)
- A. Treshchalov, H. Erikson, L. Puust, S. Tsarenko, R. Saar, A. Vanetsev, K. Tammeveski, I. Sildos, "Stabilizer-free silver nanoparticles as efficient catalysts for electrochemical reduction of oxygen", Journal of Colloid and Interface Science (2017)
- A. Vanetsev, K. Kaldvee, L. Puust, K. Keevend, A. Nefedova, S. Fedorenko, A. Baranchikov, I. Sildos, M. Rähn, V. Sammelselg, Y. Orlovskii, "Relation of crystallinity and fluorescent properties of LaF3:Nd3+ nanoparticles synthesized with different water based techniques", ChemistrySelect (2017)
- A. Treshchalov, S. Tsarenko, T. Avarmaa, R. Saar, A. Lõhmus, A. Vanetsev, I. Sildos, "He/H2 Pulsed-Discharge Plasma as a Tool for Synthesis of Surfactant-Free Colloidal Silver Nanoparticles in Water", Plasma Medicine (2016)
- U. Rocha, J. Hu, E. Rodríguez, A. Vanetsev, M. Rähn, V. Sammelselg, Y. Orlovskii, J. Solé, D. Jaque, D. Ortgies, "Subtissue Imaging and Thermal Monitoring of Gold Nanorods through Joined Encapsulation with Nd-Doped Infrared-Emitting Nanoparticles", Small Willey SHV (2016)
- O. Acik, L. Dolgov, M. Krunks, A. Mere, V. Mikli, S. Pikker, A. Loot, I. Sildos, "Surface plasmon resonance caused by gold nanoparticles formed on sprayed TiO2 films",Thin Solid Films (2013)
Head of Laboratory, Associate Professor in Optics and Spectroscopy
E-mail: sven.lange [ät] ut.ee
Phone: +372 737 4718
CV, projects: ETIS
Publications: Google Scholar, Scopus
Supervision: UT DSpace
Equipment of LLS
Lab-assembled set-up for steady-state and time-resolved (down to nanosecond) setup for photoluminescence studies covering 250 – 1100 nm spectral range. The setup is equipped with a contemporary luminescence spectrograph, an intensified CCD camera and permits measurements at cryogenic temperatures (down to 4.2 K). It includes pulsed nanosecond OPO tunable in visible and IR spectral ranges together with PMTs and digital oscilloscopes for fluorescence kinetics measurements, and several semiconductor CW laser sources.
System for time-correlated single photon counting based on PicoHarp 300 (PicoQuant), stabilized optical table (Thorlabs), and fast single photon avalanche diodes (Micro Photon Devices).
Luminescence imaging microscope equipped with a single photon detection camera (Andor iXon EMCCD), polarisation microscope, 3-axis single-mode fiber launch platform (Thorlabs), Newton EMCCD camera with Shamrock spectrometer (Andor Technologies).
Micro-Raman and -luminescence spectrometer (Renishaw inVia). The facility allows state-of-the-art Raman characterization of materials, including microscale mapping. Specially designed optical cryostat is available for microspectroscopy at cryogenic temperatures
The equipment of our chemistry lab for preparing inorganic nanomaterials involves spin-coater (Cookson SCS G3P-8), fiber tip-coater, vacuum oven (SHEL LAB 1425-2), high-temperature ovens, other equipment (ultrasonic bath, water purifier, precision electronic pipettes, etc) and labware. Also apparatus for hydrothermal microwave synthesis.
Site-selective and kinetic spectroscopy can be done with:
Tunable pulsed dye laser DL-Compact (Estla Ltd., Estonia) with laser line width Δλ = 0.0065 nm at FWHM, pumped by second harmonic of Nd:YAG (model LQ215, f=20 Hz, pulse duration 5 ns, Solar laser systems, Belarus)
Continuum Sunlite OPO system PL 9010, TRP with EX OPO frequency Extension module (signal 405 – 705, idler 715 – 1750 nm, laser line width Δλ = 0.003 nm at FWHM) pumped by second harmonics of Continuum YAG: Nd3+ laser with seeder (f = 20 Hz, pulse duration 7 ns).
The wavelength of excitation can be controlled by the wavelength meter WS 5 (HighFinesse, Germany) with the accuracy of 0.001 nm. The infrared luminescence of samples can be dispersed with the Shamrock 750 spectrometer (Andor Oxford Instruments, UK) with 1200 or 2400 grooves per mm grating with linear inverse dispersion depending on spectral range or with self-made grating with twice-higher spectral resolution.
A set of interference filters for various wavelengths are available to limit the penetration of stray light into monochromator caused by laser radiation.
The fluorescence can be detected with the gated Andor Technology iCCD camera iStar DH320T-18H-13 with a pixel size of 26 µm and with Peltier cooling system.
The fluorescence kinetics can be detected by a Hamamatsu PMT 6240-02 in gated photon counting mode with a multi-channel analyzer (Fast Comtec P7882) with time resolution of 100 ns.
A Janis CSS-300S/204N helium closed-cycle cryostat (USA) with cold finger can cool the single crystals below 7 K
A-240 liquid helium bath cryostat from Cryogenic technology lab, Institute of Physics NAS of Ukraine can cool the powders below 2K.