Abstract

With addition of an absorber to dye-doped microdroplets, an absorption-dependent blue shift in the lasing spectra has been observed. The better the spectral overlap between the absorption and the fluorescence spectra of the dye, the larger the blue shift. The experimental observations are explained by a simple model of dye lasing in an optical cavity that includes losses because of the absorber and radiation leakage.

© 1995 Optical Society of America

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References

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  1. S. C. Hill, R. E. Benner, in Optical Effects Associated with Small Particles, P. W. Barber, R. K. Chang, eds. (World Scientific, Singapore, 1988), p. 3.
  2. H.-M. Tzeng, K. F. Wall, M. B. Long, R. K. Chang, Opt. Lett. 9, 499 (1984).
    [CrossRef] [PubMed]
  3. H.-B. Lin, J. D. Eversole, A. J. Campillo, J. Opt. Soc. Am. B 9, 43 (1992).
    [CrossRef]
  4. P. Chýlek, D. Ngo, R. G. Pinnick, J. Opt. Soc. Am. A 9, 775 (1992).
    [CrossRef]
  5. P. Chýlek, H.-B. Lin, J. D. Eversole, A. J. Campillo, Opt. Lett. 16, 1723 (1991).
    [CrossRef] [PubMed]
  6. J. D. Eversole, H.-B. Lin, A. J. Campillo, Proc. Soc. Photo-Opt. Instrum. Eng. 1862, 209 (1993).
  7. D. Ngo, R. G. Pinnick, J. Opt. Soc. Am. A 11,1352 (1994).
    [CrossRef]
  8. R. L. Armstrong, J.-G. Xie, T. E. Ruekgauer, J. Gu, Opt. Lett. 18, 119 (1993).
    [CrossRef] [PubMed]
  9. F. P. Schäfer, in Dye Lasers, 2nd revised ed., F. P. Schäfer, ed. (Springer-Verlag, New York, 1977), pp. 32–37.
  10. R. R. Sauers, S. N. Husain, A. P. Piechowski, G. R. Bird, Dyes Pigm. 8, 35 (1987).
    [CrossRef]
  11. B. B. Snavely, in Dye Lasers, 2nd revised ed., F. P. Schäfer, ed. (Springer-Verlag, New York, 1977), p. 92.

1994 (1)

1993 (2)

J. D. Eversole, H.-B. Lin, A. J. Campillo, Proc. Soc. Photo-Opt. Instrum. Eng. 1862, 209 (1993).

R. L. Armstrong, J.-G. Xie, T. E. Ruekgauer, J. Gu, Opt. Lett. 18, 119 (1993).
[CrossRef] [PubMed]

1992 (2)

1991 (1)

1987 (1)

R. R. Sauers, S. N. Husain, A. P. Piechowski, G. R. Bird, Dyes Pigm. 8, 35 (1987).
[CrossRef]

1984 (1)

Armstrong, R. L.

Benner, R. E.

S. C. Hill, R. E. Benner, in Optical Effects Associated with Small Particles, P. W. Barber, R. K. Chang, eds. (World Scientific, Singapore, 1988), p. 3.

Bird, G. R.

R. R. Sauers, S. N. Husain, A. P. Piechowski, G. R. Bird, Dyes Pigm. 8, 35 (1987).
[CrossRef]

Campillo, A. J.

Chang, R. K.

Chýlek, P.

Eversole, J. D.

Gu, J.

Hill, S. C.

S. C. Hill, R. E. Benner, in Optical Effects Associated with Small Particles, P. W. Barber, R. K. Chang, eds. (World Scientific, Singapore, 1988), p. 3.

Husain, S. N.

R. R. Sauers, S. N. Husain, A. P. Piechowski, G. R. Bird, Dyes Pigm. 8, 35 (1987).
[CrossRef]

Lin, H.-B.

Long, M. B.

Ngo, D.

Piechowski, A. P.

R. R. Sauers, S. N. Husain, A. P. Piechowski, G. R. Bird, Dyes Pigm. 8, 35 (1987).
[CrossRef]

Pinnick, R. G.

Ruekgauer, T. E.

Sauers, R. R.

R. R. Sauers, S. N. Husain, A. P. Piechowski, G. R. Bird, Dyes Pigm. 8, 35 (1987).
[CrossRef]

Schäfer, F. P.

F. P. Schäfer, in Dye Lasers, 2nd revised ed., F. P. Schäfer, ed. (Springer-Verlag, New York, 1977), pp. 32–37.

Snavely, B. B.

B. B. Snavely, in Dye Lasers, 2nd revised ed., F. P. Schäfer, ed. (Springer-Verlag, New York, 1977), p. 92.

Tzeng, H.-M.

Wall, K. F.

Xie, J.-G.

Dyes Pigm. (1)

R. R. Sauers, S. N. Husain, A. P. Piechowski, G. R. Bird, Dyes Pigm. 8, 35 (1987).
[CrossRef]

J. Opt. Soc. Am. A (2)

J. Opt. Soc. Am. B (1)

Opt. Lett. (3)

Proc. Soc. Photo-Opt. Instrum. Eng. (1)

J. D. Eversole, H.-B. Lin, A. J. Campillo, Proc. Soc. Photo-Opt. Instrum. Eng. 1862, 209 (1993).

Other (3)

F. P. Schäfer, in Dye Lasers, 2nd revised ed., F. P. Schäfer, ed. (Springer-Verlag, New York, 1977), pp. 32–37.

B. B. Snavely, in Dye Lasers, 2nd revised ed., F. P. Schäfer, ed. (Springer-Verlag, New York, 1977), p. 92.

S. C. Hill, R. E. Benner, in Optical Effects Associated with Small Particles, P. W. Barber, R. K. Chang, eds. (World Scientific, Singapore, 1988), p. 3.

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Figures (4)

Fig. 1
Fig. 1

Lasing spectra from Rhodamine B in ethanol microdroplets with Nigrosin absorber concentrations of 0.0, 0.01, 0.05, 0.1, and 0.2 mg/mL, respectively. The concentration of Rhodamine B is 5 × 10−4 M. The curves for the five samples are shifted vertically [by 3.0, 2.0, 1.0, −0.3, and 0.14 (a.u.), respectively] for clarity of visualization. Laser power is ≃10 MW/cm2.

Fig. 2
Fig. 2

Lasing spectra from Rhodamine B in ethanol microdroplets with concentrations of 5 × 10−5, 10−4, 5 × 10−4, and 10−3 M, respectively. No Nigrosin absorber is added. The four lasing spectra are shifted vertically [by 3.0, 2.0, 1.0, and 0.0 (a.u.), respectively].

Fig. 3
Fig. 3

Lasing spectra from DCM in ethanol micro-droplets with Nigrosin absorber concentrations of 0.0, 0.02, and 0.05 mg/mL, respectively. The concentration of DCM is 5 × 10−4 M. The three lasing spectra are shifted vertically [by 1.0, 0.3, and 0.0 (a.u.), respectively].

Fig. 4
Fig. 4

Stimulated absorption σa(λ) and stimulated emission σe(λ) spectra of Rhodamine B in ethanol.10 Also shown is a schematic of Nigrosin absorption, σabs. (b) The minimum fraction of dye molecules, γ, to be excited for lasing is plotted as a function of wavelength for αabs = 0.0, 0.75, 1.5, and 5.0 cm−1, respectively. The values of γ for αabs = 0.75, 1.5, and 5.0 cm−1 have been multiplied by 0.25, 0.17, and 0.06, respectively, to plot γ for all αabs in the same scale as that for αabs = 0.

Equations (2)

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n 1 σ e ( λ ) α leakage ( λ ) + α abs ( λ ) + n 0 σ a ( λ ) ,
γ ( λ ) = n 1 ( λ ) n T = 2 π m n T λ Q 0 + α abs n T + σ a ( λ ) σ a ( λ ) + σ e ( λ ) ,

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