Atomic & Optical Physics Lab
Prof. Vasant Natarajan
Department of Physics , Indian Institute of Science
Bangalore , India

Some of our recent Publications in Frequency Measurement,   Hyperfine Measurement,   Quantum Optics,   Wavemeter,   Laser Cooling,   Spectroscopy,   Electric dipole moment,   Optical Tweezers, and   Atom Optics.   You can read some of Prof. Vasant Natarajan's popular articles (mostly published in Resonance) here.

Updated May 17, 2012

• Frequency Measurement
 
 


1. Isotope shifts and hyperfine structure in the 555.8-nm ${^1S}_0 \rightarrow {^1P}_1$ line of Yb
   Kanhaiya Pandey, Alok K. Singh, P. V. Kiran Kumar, M. V. Suryanarayana, and Vasant Natarajan
   Physical Review A, vol. 80, 022518 (2009).

2. Absolute frequency determination of the $5P_{3/2} \rightarrow 7S_{1/2}$ transition in $^{87}$Rb
   Kanhaiya Pandey, P. V. Kiran Kumar, M. V. Suryanarayana, and Vasant Natarajan
   Optics Letters, vol. 33, 1675 (2008).

3. Absolute frequency measurement of the lithium D lines:
   Precise determination of isotope shifts and fine-structure intervals
   Dipankar Das and Vasant Natarajan
   Physical Review A, vol. 75, 052508 (2007).

4. A rubidium-stabilized ring-cavity resonator for optical frequency metrology:
   precise measurement of the ${D_1}$ line in $^{133}$Cs
   Dipankar Das, Ayan Banerjee, Sachin Barthwal, and Vasant Natarajan
   European Physical Journal D vol. 38, pp. 545–552 (2006).

5. Absolute frequency measurements in Yb with 0.08 ppb uncertainty:
   Isotope shifts and hyperfine structure in the 399-nm 1S0\1P1 line
   Dipankar Das, Sachin Barthwal, Ayan Banerjee, and Vasant Natarajan
   Physical Review A, vol. 72, 032506 (2005).

6. Absolute-frequency measurements of the D2 line and fine-structure interval in 39K
   Ayan Banerjee and Vasant Natarajan
   Physical Review A, vol. 70, 052505 (2004).

7. Absolute frequency measurements of the D1 lines in 39K, 85Rb, and 87Rb with ~0.1 ppb uncertainty
   Ayan Banerjee, Dipankar Das and Vasant Natarajan
   Europhysics Letters, vol. 65(2), pp. 172–178 (2004).

8. Precise frequency measurements of atomic transitions by use of a Rb-stabilized resonator
   Ayan Banerjee, Dipankar Das, and Vasant Natarajan
   Optics Letters, vol. 28, 1579-1581 (2003).

9. Precise measurements of UV atomic lines: Hyperfine structure and isotope shifts in the 398.8nm line of Yb
   Ayan Banerjee, Dipankar Das, Umakant D. Rapol, A. Krishna, and Vasant Natarajan
   Europhysics Letters vol. 63(3), 340-346 (2003).

• Hyperfine Measurement
 
 


1. Precise measurement of hyperfine structure in the ${2P}_{1/2}$ state of $^{7}$Li using saturated-absorption spectroscopy
   Alok K. Singh, Lal Muanzuala, and Vasant Natarajan
   Physical Review A, vol. 82, 042504 (2010).

2. High-precision measurement of hyperfine structure in the $D$ lines of alkali atoms
   Dipankar Das and Vasant Natarajan
   Journal of Physics B: Atomic, Molecular and Optical Physics vol. 40, pp. 035001 (2008).

3. Resolving closely-spaced hyperfine levels in the $3P_{3/2}$ state of $^{23}$Na
   Dipankar Das, Kanhaiya Pandey, Ajay Wasan, and Vasant Natarajan
   Journal of Physics B: Atomic, Molecular and Optical Physics vol. 39, pp. 3111-3119 (2006).

4. Precise measurement of hyperfine structure in the $6P_{1/2}$ state of $^{133}$Cs
   Dipankar Das and Vasant Natarajan
   Journal of Physics B: Atomic, Molecular and Optical Physics vol. 39, pp. 2013-2019 (2006).

5. Precise measurement of hyperfine structure in the $5^2P_{1/2}$ state of Rb
   Dipankar Das and Vasant Natarajan
   European Physical Journal D vol. 37, pp. 313-317 (2006).

6. Hyperfine spectroscopy on the $6P_{3/2}$ state of $^{133}$Cs using coherent control
   Dipankar Das and Vasant Natarajan
   Europhysics Letters vol. 72 (5), pp. 740-746 (2005).

7. High-resolution hyperfine spectroscopy of excited states using electromagnetically induced transparency
   Anusha Krishna, Kanhaiya Pandey, Ajay Wasan, and Vasant Natarajan
   Europhysics Letters, vol. 72 (2), pp. 221–227 (2005).

8. Precise measurement of hyperfine structure in the 5P_3/2 state of  ⁸⁵Rb
   Umakant D. Rapol, Anusha Krishna, and Vasant Natarajan
   European Physical Journal D vol. 23, pp. 185-188 (2003).

9. Precise measurement of hyperfine intervals using avoided crossing of dressed states
   Umakant D. Rapol and Vasant Natarajan
   Europhysics Letters 60(2), pp. 195-200 (2002).

• Quantum Optics
 
 


1. Subnatural linewidth in a strongly-driven degenerate two-level system
   Sapam Ranjita Chanu, Alok K. Singh, Boris Brun, Kanhaiya Pandey, and Vasant Natarajan
   Optics Communications, vol. 284, pp. 4957-4960 (2011).

2. Chopped nonlinear magneto-optic rotation: A technique for precision measurements
   Harish Ravishankar, Sapam Ranjita Chanu, and Vasant Natarajan
   Europhysics Letters, vol. 94, 53002 (2011).

3. Role of population transfer under strong probe conditions in electromagnetically induced transparency
   Kanhaiya Pandey, Dipankar Kaundilya, and Vasant Natarajan
   Optics Communications, vol. 284, pp. 252-255 (2011).

4. Transient response of nonlinear magneto-optic rotation in a paraffin-coated Rb vapor cell
   M. Ummal Momeen, G. Rangarajan, and Vasant Natarajan
   Physical Review A, vol. 81, 013413 (2010).

5. Line narrowing of electromagnetically induced transparency in Rb with a longitudinal magnetic field
   S. M. Iftiquar and Vasant Natarajan
   Physical Review A, vol. 79, 013808 (2009).

6. Coherent control of magneto-optic rotation
   Kanhaiya Pandey, Ajay Wasan and Vasant Natarajan
   Journal of Physics B: Atomic, Molecular and Optical Physics vol. 41, pp. 225503 (2008).

7. Splitting of electromagnetically induced transparency under strong-probe condition due to Doppler averaging
   Kanhaiya Pandey and Vasant Natarajan
   Journal of Physics B: Atomic, Molecular and Optical Physics vol. 41, pp. 185504 (2008).

8. Subnatural linewidth for probe absorption in an electromagnetically induced transparency medium due to Doppler averaging
   S. M. Iftiquar, G. R. Karve, and Vasant Natarajan
   Physical Review A, vol. 77, 063807 (2008).

9. Doppler-free spectroscopy in driven three-level systems
   Umakant D. Rapol and Vasant Natarajan
   European Physical Journal D vol. 28, pp. 317-322 (2004).

10. Observation of sub-natural linewidths for cold Rb atoms in a magneto-optic trap
    Umakant D. Rapol, Ajay Wasan, and Vasant Natarajan
    Europhysics Letters 61, pp. 53-59 (2003).

11. Sub-natural linewidth in room-temperature Rb vapor using a control laser
    Umakant D. Rapol, Ajay Wasan, and Vasant Natarajan
    Physical Review A 67, 053802 (2003).

• Wavemeter
 
 


1. Precise frequency measurements of the D-lines and fine-structure interval in K
   Ayan Banerjee, Dipankar Das, and Vasant Natarajan
   Journal of the Optical Society of America B, vol. 21(1), pp. 79-82 (2004).

2. Direct measurement of the fine-structure interval in alkali atoms using diode lasers
   Ayan Banerjee, Umakant D. Rapol, and Vasant Natarajan
   Applied Physics Letters, vol. 80, pp. 3688-3690 (2002).

3. High-accuracy wavemeter based on a stabilized diode laser
   Ayan Banerjee, Umakant D. Rapol, Ajay Wasan, and Vasant Natarajan
   Applied Physics Letters, vol.79, pp. 2139-2141 (2001).

• Laser Cooling
 
 


1. Atomic fountain of laser-cooled Yb atoms for precision measurements
   Kanhaiya Pandey, K. D. Rathod, Alok K. Singh, and Vasant Natarajan
   Physical Review A, vol. 82, 043429 (2010).

2. Magnetic trapping of Yb in the metastable ${^3P}_2$ state
   Kanhaiya Pandey, K. D. Rathod, Sambit Bikas Pal, and Vasant Natarajan
   Physical Review A, vol. 81, 033424 (2010).

3. Laser cooling of $^{173}$Yb for isotope separation and precision hyperfine spectroscopy
   Dipankar Das and Vasant Natarajan
   Physical Review A, vol. 77, 063807 (2008).

4. Laser cooling and trapping of Yb from a thermal source
   Umakant D. Rapol, Anusha Krishna, Ajay Wasan, and Vasant Natarajan
   European Physical Journal D vol. 29, pp. 409-414 (2004).

5. Loading of a Rb magneto-optic trap from a getter source
   Umakant D. Rapol, Ajay Wasan, and Vasant Natarajan
   Physical Review A 64, 023402 (2001).

• Spectroscopy
 
 


1. Frequency locking of tunable diode lasers to a rubidium-stabilized ring-cavity resonator
   Ayan Banerjee, Dipankar Das, Umakant D. Rapol, and Vasant Natarajan
   Applied Optics, vol. 43, 2528-2531 (2004).

2. Saturated-absorption spectroscopy: Eliminating crossover resonances using co-propagating beams
   Ayan Banerjee and Vasant Natarajan
   Optics Letters, vol. 28, 1912-1914 (2003).

• Electric Dipole Moment
 
 


1. Proposed search for an electric-dipole moment using laser-cooled $^{171}$Yb atoms
   Vasant Natarajan
   European Physical Journal D vol. 32, pp. 33–38 (2005).

• Optical Tweezers
 
 


1. Change in spectrum of Brownian fluctuations of optically trapped red blood cells due to malarial infection
   Vishal Saraogi, P. Padmapriya, Apurba Paul, Utpal Tatu, and Vasant Natarajan
   Journal of Biomedical Optics vol. 15, 037003 (2010).

2. Direct measurement of the oscillation frequency in an optical-tweezers trap by parametric excitation
   Joji Joykutty, Vaibhav Mathur, V. Venkataraman, and Vasant Natarajan
   Physical Review Letters vol. 95, 193902 (2005).

• Atom Optics
 
 


1. Optimal profile for a Gaussian standing-wave atom-optical lens
   R. E. Behringer, Vasant Natarajan, and G. Timp
   Optics Letters, vol. 22, pp. 114-116 (1997).

2. Laser focused atomic deposition: A new lithography tool
   R. E. Behringer, Vasant Natarajan, and G. Timp
   Applied Physics Letters, vol. 68, pp. 1034-1036 (1996).

3. High-contrast, high-resolution focusing of neutral atoms using light forces
   Vasant Natarajan, Robert E. Behringer, and Gregory Timp
   Physical Review A, vol. 53, pp. 4381-4385 (1996).

4. Limit of resolution of a standing wave atom optical lens
   R. E. Behringer, Vasant Natarajan, G. Timp, and D. M. Tennant
   Journal of Vacuum Science and Technology B, vol. 14, pp. 4072-4075 (1996).