Abstract

The temporal profiles of the emission from titania particle suspensions in Rhodamine 640 perchlorate dye solutions excited by 10-ps pulses of 527-nm radiation were measured over a wide range of particle and dye concentrations and laser powers. The dynamics of stimulated emission from random media is modeled by a random walk of photons within the colloid and rate equations for molecular excitations. The pulse width and the dependence of the threshold for laser action on dye and scatter concentration are computed by a Monte Carlo simulation of the model and are found to be in qualitative agreement with experiment.

© 1996 Optical Society of America

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References

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  1. V. S. Letokhov, Sov. Phys. JETP 26, 835 (1968).
  2. V. M. Markushev, V. F. Zolin, Ch. M. Briskina, Sov. J. Quantum Electron. 16, 281 (1986).
    [CrossRef]
  3. N. M. Lawandy, R. M. Balachandran, A. S. L. Gomes, N. M. Lawandy, Nature (London) 368, 436 (1994).
    [CrossRef]
  4. W. L. Sha, C.-H. Liu, R. R. Alfano, Opt. Lett. 19, 1922 (1994).
    [CrossRef] [PubMed]
  5. A. Z. Genack, M. J. Drake, Nature (London) 368, 400 (1994).
    [CrossRef]

1994

N. M. Lawandy, R. M. Balachandran, A. S. L. Gomes, N. M. Lawandy, Nature (London) 368, 436 (1994).
[CrossRef]

W. L. Sha, C.-H. Liu, R. R. Alfano, Opt. Lett. 19, 1922 (1994).
[CrossRef] [PubMed]

A. Z. Genack, M. J. Drake, Nature (London) 368, 400 (1994).
[CrossRef]

1986

V. M. Markushev, V. F. Zolin, Ch. M. Briskina, Sov. J. Quantum Electron. 16, 281 (1986).
[CrossRef]

1968

V. S. Letokhov, Sov. Phys. JETP 26, 835 (1968).

Alfano, R. R.

Balachandran, R. M.

N. M. Lawandy, R. M. Balachandran, A. S. L. Gomes, N. M. Lawandy, Nature (London) 368, 436 (1994).
[CrossRef]

Briskina, Ch. M.

V. M. Markushev, V. F. Zolin, Ch. M. Briskina, Sov. J. Quantum Electron. 16, 281 (1986).
[CrossRef]

Drake, M. J.

A. Z. Genack, M. J. Drake, Nature (London) 368, 400 (1994).
[CrossRef]

Genack, A. Z.

A. Z. Genack, M. J. Drake, Nature (London) 368, 400 (1994).
[CrossRef]

Gomes, A. S. L.

N. M. Lawandy, R. M. Balachandran, A. S. L. Gomes, N. M. Lawandy, Nature (London) 368, 436 (1994).
[CrossRef]

Lawandy, N. M.

N. M. Lawandy, R. M. Balachandran, A. S. L. Gomes, N. M. Lawandy, Nature (London) 368, 436 (1994).
[CrossRef]

N. M. Lawandy, R. M. Balachandran, A. S. L. Gomes, N. M. Lawandy, Nature (London) 368, 436 (1994).
[CrossRef]

Letokhov, V. S.

V. S. Letokhov, Sov. Phys. JETP 26, 835 (1968).

Liu, C.-H.

Markushev, V. M.

V. M. Markushev, V. F. Zolin, Ch. M. Briskina, Sov. J. Quantum Electron. 16, 281 (1986).
[CrossRef]

Sha, W. L.

Zolin, V. F.

V. M. Markushev, V. F. Zolin, Ch. M. Briskina, Sov. J. Quantum Electron. 16, 281 (1986).
[CrossRef]

Nature

N. M. Lawandy, R. M. Balachandran, A. S. L. Gomes, N. M. Lawandy, Nature (London) 368, 436 (1994).
[CrossRef]

A. Z. Genack, M. J. Drake, Nature (London) 368, 400 (1994).
[CrossRef]

Opt. Lett.

Sov. J. Quantum Electron.

V. M. Markushev, V. F. Zolin, Ch. M. Briskina, Sov. J. Quantum Electron. 16, 281 (1986).
[CrossRef]

Sov. Phys. JETP

V. S. Letokhov, Sov. Phys. JETP 26, 835 (1968).

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Figures (3)

Fig. 1
Fig. 1

Time-resolved emission from Rhodamine 640 dye in methanol (10−3 M, la = 140 μm) with titania particles (5 × 1011 cm−3, l = 16 μm). (a) Spontaneous emission after excitation with 7 μJ of pump light. (b) Emission at threshold of ~13-μJ pump energy. (c) Short pulse at a pump energy above threshold (16 μJ). The reference pulse shown in each figure indicates the input pulse duration and the time resolution of the detection system. Its timing with respect to the onset of the emission varies from (a) to (c). Ep/Ethr is the ratio of pump to threshold energies.

Fig. 2
Fig. 2

Emission profiles from the Monte Carlo simulations for l = 18 μm and la = 140 μm. Emission for a pump energy (a) below threshold (0.12 μJ), (b) at threshold (0.47 μJ), (c) slightly above threshold (0.59 μJ), and (d) far above threshold (2.8 μJ).

Fig. 3
Fig. 3

Calculated threshold pump energy versus (a) la for fixed l = 30 μm and (b) l for fixed la = 120 μm.

Tables (1)

Tables Icon

Table 1 Threshold Pump Energies and Measured FWHM of the Emission for Various Particle Densities and Dye Concentrationsa

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