Abstract

This paper studies the coherence of the radio-frequency (RF) beat note between the two frequencies emitted by a two-eigenstate solid-state laser operating in pulsed regime. Depending on how the pulsed operation regime is obtained-passive Q switching using a saturable absorber or resonant amplitude modulation using pump-power modulation-we show theoretically and experimentally that the RF beat note loses or maintains its coherence from pulse to pulse. Namely, RF coherence is shown to be lost when the laser intensity vanishes between pulses, while it can be maintained if a slight amount of intensity remains inside the cavity between pulses. We give experimental demonstrations of these results for both Nd:YAG and Er-Yb:glass two-frequency pulsed lasers, in connection with applications to lidar-radar systems.

© 2003 IEEE

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Appl. Opt. (1)

Opt. Lett. (1)

Other (26)

J. B. Riviere, R. Baribault, D. Gay, N. McCarthy and M. Piché, "Stabilization of terahertz beats from a pair of picosecond dye lasers by coherent photon seeding", Opt. Commun., vol. 161, pp. 31-36, Mar. 1, 1999.

T. D. Raymond and A. V. Smith, "Two-frequency injection seeded Nd:YAG laser", IEEE J. Quantum Electron., vol. 31, pp. 1734 -1737, Oct. 1995.

H. Statz and G. de Mars, "Transients and oscillation pulses in masers," in Quantum Electronics, C. H. Townes, Ed. New York: Columbia Univ. Press, 1960, pp. 530-537.

D. E. McCumber, "Intensity fluctuations in the output of CW laser oscillators", Phys. Rev., vol. 141, pp. 306-322, Jan. 1966 .

T. Kimura and K. Otsuka, "Response of a cw Nd:YAG laser to sinusoidal cavity perturbations", IEEE J. Quantum Electron., vol. QE-6, pp. 764-769, Dec. 1970.

H. G. Danielmeyer and F. W. Ostermayer, Jr., "Diode-pump-modulated Nd:YAG laser", J. Appl. Phys., vol. 43, pp. 2911-2913, June 1972.

A. Papoulis, Probability, Random Variables and Stochastic Processes, 2nd ed. NewYork: McGraw-Hill, 1984.

N. D. Lai, M. Brunel, F. Bretenaker and A. Le Floch, "Stabilization of the repetition rate of passively Q -switched diode-pumped solid-state lasers", Appl. Phys. Lett., vol. 79, pp. 1073-1075, Aug. 20, 2001.

D. Romanini, A. Kachanov, E. Lacot and F. Stoeckel, "Loss of spectral memory in the relaxation oscillations of a multimode solid-state laser", Phys. Rev. A, vol. 54, pp. 920-927, Jul. 1996.

S. R. Chinn, H. Y.-P. Hong and J. W. Pierce, "Spiking oscillations in diode-pumped NdP5O14 and NdAl3( BO3)4 lasers", IEEE J. Quantum Electron., vol. QE-12, pp. 189-193, Mar. 1976.

K. Kubodera and K. Otsuka, "Spike mode oscillations in laser-diode pumped LiNdP4O12 lasers", IEEE J. Quantum Electron., vol. QE-17, pp. 1139-1144, June 1981.

D. Pieroux, T. Erneux and P. Mandel, "Pump modulation of a two-mode Fabry-Perot laser: influence of an internal resonance", Phys. Rev. A, vol. 54, pp. 3409-3419, Oct. 1996.

J. Sola, J. C. Martin and J. M. Alvarez, "Nonlinear response of a unidirectional erbium-doped fiber ring laser to a sinusoidally modulated pump power", Opt. Commun. , vol. 212, pp. 359-369, Nov. 1, 2002.

W. H. Press, S. A. Teukolsky, W. T. Wetterling and B. P. Flannery, Numerical Recipes in Fortran 90, Cambridge: U.K.: Cambridge Univ. Press, 1996.

A. E. Siegman, Lasers, Mill Valley, CA: University Science, 1986.

M. Brunel, O. Emile, F. Bretenaker, A. Le Floch, B. Ferrand and E. Molva, "Tunable two-frequency lasers for lifetime measurements", Opt. Rev., vol. 4, no. 5, pp. 550-552, 1997.

G. W. Baxter, J. M. Dawes, P. Dekker and D. S. Knowles, "Dual-polarization frequency-modulated laser source", IEEE Photon. Technol. Lett., vol. 8, pp. 1015 -1017, Aug. 1996.

M. Brunel, F. Bretenaker, S. Blanc, V. Crozatier, J. Brisset, T. Merlet and A. Poezevara, "IEEE Photon. Technol. Lett.", vol. 16, Mar. 2004. to be published.

M. Brunel, O. Emile, M. Vallet, F. Bretenaker, A. Le Floch, L. Fulbert, J. Marty, B. Ferrand and E. Molva, "Experimental and theoretical study of monomode vectorial lasers passively Q switched by a Cr4+:YAG absorber", Phys. Rev. A, vol. 60, pp. 4052-4058, Nov. 1999.

R. L. Byer, "Diode laser-pumped solid-state lasers", Science, vol. 239, pp. 742-747, Feb. 12, 1988.

W. Koechner, Solid-State Laser Engineering, 4th ed. Berlin: Germany: Springer, 1996.

J. J. Zayhowski, "Rev. Laser Eng.", vol. 26, pp. 841-846, Dec. 1998.

P. Laporta, S. Taccheo, S. Longhi, O. Svelto and C. Svelto, "Erbium-ytterbium microlasers: optical properties and lasing characteristics", Opt. Mater., vol. 11, pp. 269 -288, Jan. 1999.

A. J. C. Vieira, P. R. Herczfeld, A. Rosen, M. Ermold, E. E. Funk, W. D. Jemison and K. J. Williams, "A mode-locked microchip laser optical transmitter for fiber radio", IEEE Trans. Microwave Theory Tech., vol. 49, pp. 1882-1887, Oct. 2001.

M. Alouini, B. Benazet, M. Vallet, M. Brunel, P. Di Bin, F. Bretenaker, A. Le Floch and P. Thony, "Offset phase locking of Er:Yb:glass laser eigenstates for RF photonics applications", IEEE Photon. Technol. Lett., vol. 13, pp. 367-369, Apr. 2001.

Y. Li, A. J. C. Vieira, S. M. Goldwasser and P. R. Herczfeld, "Rapidly tunable millimeter-wave optical transmitter for lidar-radar", IEEE Trans. Microwave Theory Tech., vol. 49, pp. 2048-2054, Oct. 2001.

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