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Upcoming Events
May 15, 16:30, 2012, F219, Zellu 8: Video lecture "Beyond the Standard Model: The Particle Physics Frontier" by Michael Ramsey-Musolf
Past Events
April 24, 16:30, 2012, F219, Zellu 8: Video lecture "The Quantum Mechanics of Time Travel" by Dr. Seth Lloyd
April 10, 16:30, 2012, F219, Zellu 8: Gatavošanās konferencei "Developments in Optics and Communications 2012"
March 20, 16:30, 2012, F219, Zellu 8: Nobel lecture by Saul Perlmutter
Available online at http://www.nobelprize.org/mediaplayer/index.php?id=1725
March 13, 16:30, 2012, F219, Zellu 8: "What is mass: simple models to illustrate the Higgs mechanism."
by Dr. V. Kaščejevs
March 6, 16:30, 2012, F219, Zellu 8: Video lecture "Quantum Mechanics in Your Face" by Sidney R. Coleman
February 28, 16:30, 2012, F219, Zellu 8: Video lecture "Photons - Corpuscles of Light " by Richard Feynman
February 21, 16:30, 2012, F219, Zellu 8: Koherenti efekti atomu mijiedarbībā ar gaismu: Vienkārša tumšā stāvokļa kvantu mehāniskais apraksts (II)
by Dr. Florian Gahbauer
February 14, 16:30, 2012, F219, Zellu 8: Koherenti efekti atomu mijiedarbībā ar gaismu: Vienkārša tumšā stāvokļa kvantu mehāniskais apraksts
by Dr. Florian Gahbauer
Semināra laikā aplūkosim vienkāršu sistēmu ar tumšo stāvokli, sekojot B. Šora rakstam "Examples of counter-intuitive physics" (Conemporary Physics, 36:1, 15-28 [1995]). Apskatīsim 3-līmeņu sistēmu, gaismas polarizāciju dažādās atskaites sistēmās, sistēmas Hamiltoniāni, īpašvektorus un tumšās superpozīcijas.
February 8, 16:15, 2012, F219, Zellu 8: OSA Latvian Student Chapter biedru sapulce
2012. gada pavasara semestrī OSA-Latvia rīkotie semināri notiks katru nedēļu otrdienās plkst 16:30 Zeļļu ielā 8, laboratoriju korpusa F219 telpā.December 21, 16:15, 2011, F219, Zellu 8: Kvantu skaitļošana
by Artūrs Ciniņš
Šoreiz stāstīšu par kvantu informātikas teorētiskajiem pamatiem un kvantu skaitļošanas algoritmu eksperimentālas realizācijas iespējām.
December 5, 16:15, 2011, F219, Zellu 8: Magnētiskā lauka mērīšanas metodes
by Valdis Zuters
Magnētiskais lauks ir mums visapkārt: mūsu planētai Zeme ir pastāvīgs magnētiskais lauks, dažādu elektronisko ierīču pamatā ir magnētiskie procesi, un pat mūsu sirds un smadzeņu darbība ir cieši saistīt, lai gan ar ļoti vājiem, bet tomēr magnētiskajiem signāliem. Laika gaitā ir attīstījušas dažādas magnētiskā lauka mērīšanas metodes, kas ļauj mērīt magnētisko lauku gan plaša vērtību diapazonā, gan ar ļoti augstu precizitāti. Šoreiz OSA semināra būs runa par magnētiskā lauka mērīšanas metodēm.
November 22, 16:15, 2011, F219, Zellu 8: Gravitācijas viļņi
by Artūrs Ciniņš
November 1, 16:15, 2011, F219, Zellu 8: OSA studentu ikgadējā sanāksme un konference Frontiers in Optics/ Laser Science
by Laima Bušaite
October 25, 16:15, 2011, F219, Zellu 8: Tumšās matērijas meklējumi ar eksotisku atomu palīdzību: GAPS eksperiments
by Dr. Florian Gahbauer
Tiek uzskatīts, ka apmēram 25% no Visuma ir tā sauktā tumša matērija, kuras īpašības nav zināmas. Tomēr ir dažādi tumšas matērijas kandidāti, starp kuriem ir hipotētiska supersimetrijas teorijas daļiņa neitralino. Neitralino ir vienlaicīgi daliņa un anti-daliņa tā, ka divi neitralino, kas mijiedarbojas, var iznīcināt viens otru, radot daudz citu daļiņu, starp kurām varētu būt anti-deiterons (kodols ar anti-neitronu un anti-protonu), kurus detektēšana faktiski nebūtu sagaidāma, ja nebūtu neitralino. GAPS (General AntiParticle Spectrometer) ir eksperiments, kas meklē anti-deiteronu kosmiskajā starojumā, jo tie liecinātu par tumšo matēriju. GAPS eksperiments ir zonde, kurai paredzēts lidot aptuveni 35km augstumā virs zemes. Pašlaik tiek gatavots prototips, lai testētu tehnoloģiju. Stāstīšu par tumšo matēriju, kā tā tiek meklēta, GAPS detektora darbības principu un par prototipa gatavošanu.
April 3, 16.15, 2008, F219, Zellu 8: Frontiers in Optics 2007, Plenary Session video
March 6, 16.15, 2008, F219, Zellu 8: Interview with Richard Feynman "The Pleasure of Finding Things Out".
February 3, 16.15, 2008, F219, Zellu 8: Optical computer mice.
by Arturs Cinins
Nowadays well-known mechanical mouse has been almost completely replaced by optical and laser mice. While operation of mechanical mouse is well explained, principle of operation of optical mouse still remains as a secret for ordinary people.
In this speech principles of operation and most important components of optical mouse will be inspected. We will try to understand main reasons why optical and laser mice are better than mechanical ones, and why optical mouse can not operate properly on transparent and glossy surfaces.
January 21, 16.15, 2008, F219, Zellu 8: Gravity waves.
by Juris Ulmanis
December 17, 16.15, 2007, F219, Zellu 8: Dark matter.
by Florian Gahbauer
It is generally accepted that a large fraction of the Universe consists of dark matter, but its constitution remains a mystery. This talk will describe the evidence for dark matter, various dark matter candidates, and some experiments that are searching for dark matter. Finally, an experiment will be described, which searches for evidence of dark matter in the cosmic rays.
December 3, 16.15, 2007, F219, Zellu 8: Vertical-cavity surface-emitting laser.
by Andreass Sulcs
November 29, 16.15, 2007, F219, Zellu 8: Optical Atomic Clocks.
by Artis Kruzins
Developments in Optics and Communications 2008: video
Maksim Polakov. Micro-Raman Spectra of Blood
Roberts Paeglis. Formatting of Pages
Sergejs Fomins. Masking study of instant stimuli texture segmentation
Jurgis Grube. Temperature effects in up-conversion processes for erbium - ytterbium doped oxyfluoride silicate glass
Richard W. Peterson. Favorite Lecture Demonstrations
Linards Kalvans. Survey of Cs D1 hyperfine transitions
Juris Ulmanis. Diode pumped single frequency Nd:YVO4 laser amplifier
Reinis Taukulis. Interferometer for nanometric displacement sensing
Martins Bruvelis. Magneto-Optical trap for Sodium atoms
Janis Alnis. Improved measurement of the 2S level hyperfine structure splitting
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by Linards KalvansIn the end of the 20th century techniques to slow down and even store a light impulse was proposed by physicists. In the following years a lot of theoretical and experimental research has been done, it is supposed to be very useful in enhancing the existing classical optical communication networks as well as in developing upcoming networks of quantum communications. Read more ... |
by Florian Gahbauer.Nowdays lasers can be found everywhere including optical drives, various gauges and in the simplest breloques. Usually they are bought from industrial manufacturers but there is a subculture of people who make their own lasers, consisting of components found at home or even at dumpsites. Some of them are ready to share their experience over the internet. We will try to understand some of the self-made lasers described in internet and will try to find some new ideas. Read more ... |
by Reinis Taukulis.It is self-evident that traffic jams are causing serious problems to people all over the world. Starting at 1980's physicists were trying to understand how these traffic congestions arise and how to avoid them. There are mainly two ways to tackle this problem - one can consider traffic flow to be similar to some thermodynamic process or one can simply simulate traffic on a computer. Advances in computer technologies allowed to develop simulations that can be used to improve traffic in real life. Read more ... |