Laser-pumped atomic clock exploiting pressure-broadened optical transitions

Journal of the Optical Society of America B: Optical Physics

Volumn 22, Issue 3, 2005, Pages 521-528

  Camparo, James C ^a   Coffer, John ^a   Townsend, Jeremy ^a,b  

^a AEROSPACE CORPORATION   (United States)

^b University of Southern California   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ATOMIC CLOCKS; CRYSTAL OSCILLATORS; ELECTRON TRANSITIONS; ELECTRON TRAPS; FREQUENCY STABILITY; LIGHT ABSORPTION; PRESSURE EFFECTS; PUMPING (LASER); SPURIOUS SIGNAL NOISE;

LASER PUMPED ATOMIC CLOCK; OPTICAL TRANSITION; PHASE NOISE; SINGLE MODE DIODE LASER;

SEMICONDUCTOR LASERS;

EID: 17644420347     PISSN: 07403224     EISSN: None     Source Type: Journal    
DOI: 10.1364/JOSAB.22.000521     Document Type: Article

References (55)

1. J. Vanier, M. W. Levine, D. Janssen, and M. J. Delaney, "On the use of intensity optical pumping and coherent population trapping techniques in the implementation of atomic frequency standards," IEEE Trans. Instrum. Meas. 52, 822-831 (2003).
2. B.S. Mathur, H. Tang, and W. Happer, "Light shifts in the alkali atoms," Phys. Rev. 171, 11-19 (1968).
3. J.C. Camparo and J. G. Coffer, "Conversion of laser phase noise to amplitude noise in a resonant atomic vapor: the role of laser linewidth," Phys. Rev. A 59, 728-735 (1999).
4. J.C. Camparo, "Conversion of laser phase noise to amplitude noise in an optically thick vapor," J. Opt. Soc. Am. B 15, 1177-1186 (1998).
5. J.C. Camparo and W. F. Buell, "Laser PM to AM conversion in atomic vapors and short term clock stability," in Proceedings of the 1997 IEEE Frequency Control Symposium (Institute of Electrical and Electronics Engineers, Piscataway, N.J., 1997), pp. 253-258.
6. L.L. Lewis and M. Feldman, "Optical pumping by lasers in atomic frequency standards," in 35th Annual Frequency Control Symposium (Electronic Industries Association, Washington, D. C., 1981), pp. 612-624.
7. C.H. Volk, J. C. Camparo, and R. P. Frueholz, "Investigations of laser pumped gas cell atomic frequency standard," in Proceedings of the 13th Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting, NASA Conference Publication 2220 (1982), pp. 631-640.
8. M. Hashimoto and M. Ohtsu, "Experiments on a semiconductor laser pumped rubidium atomic clock," IEEE J. Quantum Electron. QE-23, 446-451 (1987).
9. L.A. Budkin, V. L. Velichanski, A. S. Zibrov, A. A. Lyalyaskin, M. N. Penenkov, and A. I. Pikhtelev, "Double radiooptical resonance in alkali metal vapors subjected to laser excitation," Sov. J. Quantum Electron. 20, 301-307 (1990).
10. 87Rb frequency standard," IEEE Trans. Instrum. Meas. 46, 126-129 (1997).
11. J.G. Coffer, M. Anderson, and J. C. Camparo, "Collisional dephasing and the reduction of laser phase-noise to amplitude-noise conversion in a resonant atomic vapor," Phys. Rev. A 65, 033807 (2002).
12. J.C. Camparo, "Reducing the light-shift in the diode laser pumped rubidium atomic clock," in Proceedings of the 1996 IEEE International Frequency Control Symposium (Institute of Electrical and Electronics Engineers, Piscataway, N.J., 1996), pp. 988-992.
13. L. Lewis, "An introduction to frequency standards," Proc. IEEE 79 927-935 (1991).
14. J.C. Camparo and R. P. Frueholz, "A comparison of various alkali gas-cell atomic-frequency standards," IEEE Trans. Ultrason. Ferroelectr. Freq. Control 34, 607-611 (1987).
15. J. Rutman, "Characterization of phase and frequency instabilities in precision frequency sources: fifteen years of progress," Proc. IEEE 66, 1048-1075 (1978).
16. J. Vanier and L.-G. Bernier, "On the signal-to noise ratio and short-term stability of passive rubidium frequency standards," IEEE Trans. Instrum. Meas. IM-30, 277-282 (1981).
17. D. Botez, "Single-mode AlGaAs diode lasers," J. Opt. Commun. 1, 42-50 (1980).
18. The laser linewidth mentioned here does not include a contribution from laser injection-current noise entering the system through the laser modulation circuitry, which we know exists but have not quantified; see W. H. Burkett, B. Lü, and M. Xiao, "Influence of injection-current noise on the spectral characteristics of semiconductor lasers," IEEE J. Quantum Electron. 33, 2111-2118 (1997).
19. Resonance cells were manufactured and filled by Opthos Instruments, Inc., Rockville, Md. (opthosεrols.com).
20. J.E. Gray and D. W. Allan, "A method for estimating the frequency stability of an individual oscillator," in Proceedings of the 28th Annual Frequency Control Symposium (Electronic Industries Association, Washington, D. C., 1974), pp. 243-246.
21. 4," J. Quant. Spectrosc. Radiat. Transf. 57, 497-507 (1997).
22. E.E. Whiting, "An empirical approximation to the Voigt profile," J. Quant. Spectrosc. Radiat. Transf. 8, 1379-1384 (1968).
23. J.C. Camparo and C. M. Klimcak, "Laser spectroscopy on a 'shoestring,'" Am. J. Phys. 51, 1077-1081 (1983).
24. J.C. Camparo and R. P. Frueholz, "Linewidths of the 0-0 hyperfine transition in optically pumped alkali-metal vapors," Phys. Rev. A 31 1440-1448 (1985).
25. J.C. Camparo and R. P. Frueholz, "Saturation of the 0-0 hyperfine transition linewidth enhancement factor in optically pumped alkali-metal vapors," Phys. Rev. A 32, 1888-1889 (1985).
26. C.H. Volk and J. C. Camparo, "Laser diode pumping in atomic clocks," in Aerospace Sponsored Research Summary Report, Rep. ATR-82(8498)-1 (The Aerospace Corporation, El Segundo, Calif., 1982), pp. 55-60.
27. L.L. Lewis and M. Feldman, "Optical pumping by lasers in atomic frequency standards," in Proceedings of the 35th Annual Frequency Control Symposium (Electronic Industries Association, Washington, D. C., 1981), pp. 612-624.
28. Y. Saburi, Y. Koga, S. Kinugawa, T. Imamura, H. Suga, and Y. Ohuchi, "Short-term stability of laser-pumped rubidium gas cell frequency standard," Electron. Lett. 30, 633-635 (1994).
29. W.J. Riley, "Early in-orbit performance of GPS block IIR rubidium clocks," in 29th Annual Precise Time and Time Interval (PTTI) Systems and Applications Meeting (U.S. Naval Observatory, Washington, D. C., 1998), pp. 213-220.
30. G. Mileti, F. L. Walls, D. A. Jennings, and R. E. Drullinger, "Laser-pumped rubidium frequency standards: new analysis and progress," IEEE J. Quantum Electron. 34, 233-237 (1998).
31. 87Rb frequency standard," IEEE Trans. Instrum. Meas. 46, 126-129 (1997).
32. 2 kHz, which is essentially a measure of high Fourier-frequency laser noise. Rather, we are referring to the laser's absolute frequency instability at Fourier frequencies below 1 Hz.
33. 133Cs hyperfine transition," J. Phys. B 8, L331-L335 (1975).
34. J.C. Camparo, R. P. Frueholz, and C. H. Volk, "Inhomogeneous light shift in alkali-metal atoms," Phys. Rev. A 27, 1914-1924 (1983).
35. 0)]. Our definition, however, is better for the present application.
36. We believe that the clock's short-term stability is limited not by the F = 2 0-0 resonance's signal characteristics [i.e., Q and (S/N)] but rather by additive injection current noise associated with the laser's frequency modulation. This influences the short-term stability by means of the frequency-dependent light-shift effect.
37. C. B. Su, R. Olshansky, J. Manning, and W. Powazinik, "Temperature dependence of threshold current in III-V semiconductor lasers: experimental prediction and explanation," Appl. Phys. Lett. 44, 1030-1032 (1984).
38. D. Chambliss and M. Johnson, "Structure dependent wavelength shifts in AlGaAs lasers near threshold and their application to a wavelength-stable source," Opt. Commun. 48, 343-346 (1984).
39. J.C. Camparo, Y. C. Chan, B. Jaduszliwer, and J. Malenfant, "Injection current calibration of diode laser wavelengths," Opt. Commun. 70, 416-420 (1989).
40. G. Missout and J. Vanier, "Pressure and temperature coefficients of the more commonly used buffer gases in rubidium vapor frequency standards," IEEE Trans. Instrum. Meas. 24, 180-183 (1975).
41. J.C. Camparo and R. P. Frueholz, "A three-dimensional model of the gas cell atomic frequency standard," IEEE Trans. Ultrason. Ferroelectr. Freq. Control 36, 185-190 (1989).
42. E.B. Sarosy, W. A. Johnson, S. K. Karuza, and F. J. Voit, "Measuring frequency changes due to microwave power variations as a function of C-field setting in a rubidium frequency standard," in Proceedings of the 23rd Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting, NASA Conference Publication 3159 (1992), pp. 229-235.
43. J. C. Camparo, "Atomic stabilization of electromagnetic field strength using Rabi resonances," Phys. Rev. Lett. 80, 222-225 (1998).
44. J.G. Coffer and J. C. Camparo, "Atomic stabilization of field intensity using Rabi resonances," Phys. Rev. A 62, 013812 (2000).
45. J.G. Coffer, B. Sickmiller, A. Presser, and J. C. Camparo, "Line shapes of atomic-candle-type Rabi resonances," Phys. Rev. A 66, 023806 (2002).
46. J.G. Coffer, B. Sickmiller, and J. C. Camparo, "Cavity-Q aging observed via an atomic-candle signal," IEEE Trans. Ultrason. Ferroelectr. Freq. Control 51, 139-145 (2004).
47. W. Happer, "Optical pumping," Rev. Mod. Phys. 44, 169-249 (1972).
48. D. Tupa and L. W. Anderson, "Effect of radiation trapping on the polarization of an optically pumped alkali-metal vapor in a weak magnetic field," Phys. Rev. A 36, 2142-2147 (1987).
49. D. K. Walter, W. M. Griffith, and W. Happer, "Magnetic slowing down of spin relaxation due to binary collisions of alkali-metal atoms with buffer-gas atoms," Phys. Rev. Lett. 88, 093004 (2002).
50. J. Vanier, "Relaxation in rubidium-87 and the rubidium maser," Phys. Rev. 168, 129-149 (1968).
51. F.A. Franz, "Relaxation at cell walls in optical-pumping experiments," Phys. Rev. A 6, 1921-1925 (1972).
52. 2 buffer gas," Phys. Rev. A 62, 065401 (2000).
53. P.J. Oreto, Y.-Y. Jau, A. B. Post, N. N. Kuzma, and W. Happer, "Buffer-gas-induced shift and broadening of hyperfine resonances in alkali-metal vapors," Phys. Rev. A 69, 042716 (2004).
54. L.B. Robinson, "Frequency shifts in the hyperfine spectra of alkalis caused by foreign gases," Phys. Rev. 117, 1275-1280 (1960).
55. F.A. Jenkins and H. E. White, Fundamentals of Optics (McGraw-Hill, New York, 1957), Chap. 15.