1. Slow and Stored Light OSA Latvian Student Chapter Linards Kalvans Riga, November 12, 2007

2. November 12, 2007Slow and Stored Light, Linards Kalvans 2 Malēnieši uztaisīja namu, bet aizmirsa ierīkot logus. Tādēļ gaismu namā nesa ar maisiem iekšā.

3. November 12, 2007Slow and Stored Light, Linards Kalvans 3 Outline Introduction Slowing down the light Storing the light Possible applications and future research

4. November 12, 2007Slow and Stored Light, Linards Kalvans 4 Phase and group velocities Phase velocity: v – phase velocity c – velocity of light in vacuum n – light refraction index in a given medium Group velocity: v g – group velocity – wavelength of light dn/d – light dispersion in a given medium

5. November 12, 2007Slow and Stored Light, Linards Kalvans 5 Slowing Down the Light EIT – Electromagnetically Induced Transparency A three level lambda system Pumping field splits the |e> state making the medium transparent to the probe

6. November 12, 2007Slow and Stored Light, Linards Kalvans 6 Slowing Down the Light Limitations: g – atom-field coupling coefficient; N – number of atoms;  – Rabi frequency;  – relaxation rate of optical coherences; k – the wave vector; L – the atomic vapor cell length; Delay and transmission of pulse as a function of control field power; The active medium is Rb vapor in near room temperature buffered with 5 torr of Ne. I. Novikova, M. Klein, D.F. Phillips and R.L. Walsworth; Proceedings of SPIE 5735, 87-97 (2005)

7. November 12, 2007Slow and Stored Light, Linards Kalvans 7 Storing the Slowed Light The long (several km) light impulse is compressed to few  m; The energy is transfered back and forth from the coupling to the probe field via atomic states; If the coupling field is turned off the light is “stored” entirely in the atomic states. The Story Behind Stopped Light. R. Walsworth, S. Yelin, and M. Lukin, Optics and Photonics News 13(5), 50 (May, 2002).

8. November 12, 2007Slow and Stored Light, Linards Kalvans 8 Experimental results I. Novikova, M. Klein, D.F. Phillips and R.L. Walsworth; Proceedings of SPIE 5735, 87-97 (2005) Optimization of slow and stored light in atomic vapor. I. Novikova, A.V. Gorshkov, D.F. Phillips, Y. Xiao, M. Klein and R.L. Walsworth Proceedings of SPIE 6482, 64820M1-64820M11 (2007)

9. November 12, 2007Slow and Stored Light, Linards Kalvans 9 Direct View of the Compressed Pulse The art of taming light: ultra-slow and stopped light, Zachary Dutton, Naomi S. Ginsberg, Christopher Slowe, and Lene Vestergaard Hau, Europhysics News (2004) Vol. 35 No. 2

10. November 12, 2007Slow and Stored Light, Linards Kalvans 10 Manipulating the Stored Light The Story Behind Stopped Light. R. Walsworth, S. Yelin, and M. Lukin, Optics and Photonics News 13(5), 50 (May, 2002).

11. November 12, 2007Slow and Stored Light, Linards Kalvans 11 Dark State Solitons – Test of BEC Superfluidity The art of taming light: ultra-slow and stopped light, Zachary Dutton, Naomi S. Ginsberg, Christopher Slowe, and Lene Vestergaard Hau, Europhysics News (2004) Vol. 35 No. 2

12. November 12, 2007Slow and Stored Light, Linards Kalvans 12 References Web page of Roland Walsworth’s group http://cfa-www.harvard.edu/Walsworth/ http://cfa-www.harvard.edu/Walsworth/ Web page of Lene Vestergaard Hau’s Lab http://www.seas.harvard.edu/haulab/ http://www.seas.harvard.edu/haulab/ The art of taming light: ultra-slow and stopped light, Zachary Dutton et al., Europhysics News (2004) Vol. 35 No. 2 http://www.europhysicsnews.com/full/26/article1/article1.html http://www.europhysicsnews.com/full/26/article1/article1.html Presentation soon available at www.osa-latvia.lvwww.osa-latvia.lv