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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 60, Iss. 7 — Jul. 1, 1970
  • pp: 902–904

Measurement of the Apparent Lifetime of the 4F3/2 State of Nd3+ in Glass under Superradiant Conditions

HARRY E. BATES  »View Author Affiliations

JOSA, Vol. 60, Issue 7, pp. 902-904 (1970)

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The rate equations for the pumping of the Nd3+ system are simplified to a single differential equation. This is solved for the population of the 4F3/2 level, N, under a pump waveform, At2e-bt, assuming that the lifetime of the state is constant. The optimum Q-switch time (time at which N and the output energy of the laser pulse are maximum) is then calculated. The optimum Q-switch time is given as a function of pump input energy for a 5-wt% Nd2O3 in barium crown glass, 80-mm-long clad laser rod, pumped with an FX38 flash tube driven by a simple LC circuit. From these results, the apparent lifetime of the 4F3/2, level was shown to decrease from 157 µsec with 67.5-J input to 57 µsec with a 144-J input.

HARRY E. BATES, "Measurement of the Apparent Lifetime of the 4F3/2 State of Nd3+ in Glass under Superradiant Conditions," J. Opt. Soc. Am. 60, 902-904 (1970)

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  1. N. A. Tolstoi and A. P. Abramov, Opt. Spectrosc. 20, 187 (1966).
  2. V. K. Konyukhow, L. A. Kulevskii, and A. M. Prokhorov, Sov. Phys. JETP 18, 588 (1964).
  3. J. I. Masters, Nature 202, 1090 (1964).

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