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Slow and Stored Light. OSA Latvian Student Chapter Linards Kalvans Riga, November 12, 2007. Malēnieši uztaisīja namu, bet aizmirsa ierīkot logus. Tādēļ gaismu namā nesa ar maisiem iekšā. . Outline. Introduction Slowing down the light Storing the light
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Slow and Stored Light OSA Latvian Student Chapter Linards Kalvans Riga, November 12, 2007
Malēnieši uztaisīja namu, bet aizmirsa ierīkot logus. Tādēļ gaismu namā nesa ar maisiem iekšā. Slow and Stored Light, Linards Kalvans
Outline • Introduction • Slowing down the light • Storing the light • Possible applications and future research Slow and Stored Light, Linards Kalvans
Phase and group velocities • Phase velocity: v – phase velocityc – velocity of light in vacuumn – light refraction index in a given medium • Group velocity: vg – group velocityl – wavelength of lightdn/dl – light dispersion in a given medium Slow and Stored Light, Linards Kalvans
Pumping field splits the |e> state making the medium transparent to the probe Slowing Down the LightEIT –Electromagnetically Induced Transparency • A three level lambda system Slow and Stored Light, Linards Kalvans
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) Slowing Down the Light • Limitations: g – atom-field coupling coefficient;N – number of atoms;W – Rabi frequency;g – relaxation rate of optical coherences;k – the wave vector;L – the atomic vapor cell length; Slow and Stored Light, Linards Kalvans
The Story Behind Stopped Light.R. Walsworth, S. Yelin, and M. Lukin,Optics and Photonics News 13(5), 50 (May, 2002). Storing the Slowed Light • The long (several km) light impulse is compressed to few mm; • 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. Slow and Stored Light, Linards Kalvans
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. WalsworthProceedings of SPIE 6482, 64820M1-64820M11 (2007) Slow and Stored Light, Linards Kalvans
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 Slow and Stored Light, Linards Kalvans
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). Slow and Stored Light, Linards Kalvans
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 Slow and Stored Light, Linards Kalvans
References • Web page of Roland Walsworth’s grouphttp://cfa-www.harvard.edu/Walsworth/ • Web page of Lene Vestergaard Hau’s Labhttp://www.seas.harvard.edu/haulab/ • The art of taming light: ultra-slow and stopped light, Zachary Duttonet al., Europhysics News (2004) Vol. 35 No. 2http://www.europhysicsnews.com/full/26/article1/article1.html Presentation soon available at www.osa-latvia.lv Slow and Stored Light, Linards Kalvans
