Publications in Journals

1. High Accuracy wavemeter based on a stabilized diode laser, Ayan Banerjee, Umakant D. Rapol, Ajay Wasan, and Vasant Natarajan, Applied Physics Letters 79, pp. 2139 - 2141 (2001).
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 80, pp. 3688 - 3691 (2002).
3. Precise frequency measurements of atomic transitions by use of a Rb-stabilized resonator, Ayan Banerjee, Dipankar Das, and Vasant Natarajan, Optics Letters 28, pp. 1579 - 1581 (2003).
4. Precise measurement of UV atomic lines: Hyperfine structure and isotope shifts in the 398.8 nm line of Yb, Ayan Banerjee, Umakant D. Rapol, Dipankar Das, Anusha Krishna, and Vasant Natarajan, Europhysics Letters 63, pp. 340 – 346 (2003).
5. Saturated-absorption spectroscopy: eliminating crossover resonances by use of copropagating beams, Ayan Banerjee and Vasant Natarajan, Optics Letters 28, pp. 1912 - 1914 (2003).
6. Precise measurement of atomic energy levels: D-lines and fine-structure interval in K, Ayan Banerjee, Dipankar Das, and Vasant Natarajan, Journal of the Optical Society of America B 21, pp. 79 - 82 (2004).
7. Absolute frequency measurements of the D₁ lines in ³⁹K, ⁸⁵ Rb and ⁸⁷Rb with ~0.1 ppb uncertainty, Ayan Banerjee, Dipankar Das, and Vasant Natarajan, Europhysics Letters 65, pp. 172 - 178 (2004).
8. Frequency locking of tunable diode lasers to a stabilized ring-cavity resonator, Ayan Banerjee, Dipankar Das, Umakant D. Rapol, and Vasant Natarajan, Applied Optics 44,.pp. 2528-2531 (2004).
9. Absolute frequency measurements of the D₂ line and fine-structure interval in ³⁹K”, Ayan Banerjee and Vasant Natarajan, Physical Review A 70, 052505 (2004).
10. 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 72, 170509 (2005).
11. A rubidium-stabilized ring-cavity resonator for optical frequency metrology: Precise measurements of the D lines in ¹³³Cs”, Dipankar Das, Ayan Banerjee, Sachin Barthwal, and Vasant Natarajan, European Physical Journal D 38, 545 - 552 (2006).
12. A Hybrid MEMS-Fiber Optic Tunable Fabry-Perot Filter”, David Hays, Anis Zribi, Len Douglas, Shivappa Goravar, Shankar Chandrasekaran, Sandip Maity, Kevin Hsu and Ayan Banerjee, submitted to IEEE/ASME Journal of Microelectromechanical Systems.

  Patents (all from General Electric, co-authors not listed) 

1. Apparatus and method for measuring steam quality, US7381954 B2.
2. Measurement of steam quality using multiple broadband lasers, US7345280 B2.
3. Method and apparatus for improved Signal to Noise ratio in Raman signal detection for MEMS-based spectrometers, US20080018890 A1.
4. Compact, hand-held Raman spectrometer microsystem on a chip, US20070236697 A1.
5. Collection probe for use in a Raman spectrometer system and methods of making and using the same, US20070127019 A1. 
6. Pre-arc detection using heterodyne detection with an amplitude-modulated RF source, US 11/972033, Filed on 10 JAN 2008. 
7. Optical Temperature Sensing Method for Steam Turbines, US12/198026, Filed on 25 AUG 2008. 
8. Optical Fuel Moisturization Sensor, US 11/874422, Filed on 18 OCT 2007. 
9. Optical power management, 11/693277, Filed on 29 MAR 2007. 
10. Ultra-high reflectivity, flat one-dimensional photonic band gap structure based mirrors for a high finesse, large tenability MEMS Fabry Perot etalon for an IR/Raman micro-spectrometer, US 11/502189, Filed on 10 AUG 2006. 
11. A high resolution, high throughput, tunable Fabry Perot etalon based on multiple vertically etched Si micro-mirrors for an IR/Raman Microspectrometer, US 11/502189, Filed on 10 AUG 2006. 
12. A micromachined latching system for integrated spectrometer, US 11/502186, Filed on 10 AUG 2006. 
13. Shaped finger for controlled displacement for Fabry Perot tuning, US 11/502187, Filed on 10 AUG 2006. 
14. Unbalanced mirror design for MEMS Fabry-Perot cavity, US 11/447779, Filed on 06 JUN2006. 
15. A parallelized detection scheme for a Raman spectrometer using multiple tunable cavities, To be filed. 
16. High sensitive, low cost protein detection using a gated phase-sensitive technique, To be filed. 
17. Automated purity checking device, To be filed

1. Hexapole and Octupole resonances in a Combined Trap”, Ayan Banerjee, S. Sevugarajan, and Vasant Natarajan, in Proceedings of the 8th ISMAS Sympo- sium On Mass Spectrometry, ed. S. K. Aggarwal, 745 (1999).
2. Experimental test of Bell's inequalities using photodissociated ¹⁷¹Yb₂ dimers”, Vasant Natarajan and Ayan Banerjee, in Proceedings of the DAE - BRNS Symposium on Spectroscopy of Lanthanides and Actinides, ed. B. N. Jagatap