Abstract

We report the first observations, to our knowledge, of lasing emission from a single, evaporating, layered, micrometer-sized droplet. The droplet consists of an ~7.9-μm-radius glass core covered by a liquid shell of an initial 3 × 10−4 M Rhodamine 6G dye-doped glycerin/water solution. After pumping by a doubled (532 nm) Nd:YAG pulsed laser, droplet lasing occurs over a range of shell thicknesses from ~14.5 to ~0.4 μm. At the smallest shell thickness, a dramatic increase in both the number and intensity of the lasing peaks occurs, in addition to a large (>40-nm) blue shift in the spectral bandwidth of lasing emission. A discussion of possible enhancement mechanisms responsible for these novel findings is given.

© 1993 Optical Society of America

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1993 (2)

1992 (3)

1990 (1)

1989 (1)

1988 (1)

1986 (1)

1984 (1)

1978 (1)

P. Chylek, J. J. Kiehl, M. K. W. Ko, Phys. Rev. A 18, 2229 (1978).
[CrossRef]

Armstrong, R. L.

Biswas, A.

Campillo, A. J.

Chang, R. K.

Chylek, P.

Essien, M.

Eversole, J. D.

Gillespie, J. B.

Green, F. J.

F. J. Green, The Sigma-Aldrich Handbook of Stains, Dyes, and Indicators (Aldrich Chemical Company, Milwaukee, Wisc., 1990).

Gu, J.

Hightower, R. L.

Hill, S. C.

S. C. Hill, Department of Electrical Engineering, New Mexico State University, Las Cruces, N.M. 88003 (personal communication, 1992).

Huston, A. L.

Kiehl, J. J.

P. Chylek, J. J. Kiehl, M. K. W. Ko, Phys. Rev. A 18, 2229 (1978).
[CrossRef]

Ko, M. K. W.

P. Chylek, J. J. Kiehl, M. K. W. Ko, Phys. Rev. A 18, 2229 (1978).
[CrossRef]

Latifi, H.

Lin, H. B.

Lin, H.-B.

Lock, J. A.

Long, M. B.

Pinnick, R. G.

Richardson, C. B.

Ruekgauer, T. E.

Tzeng, H. M.

Wall, K. F.

Xie, J.-G.

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Figures (2)

Fig. 1
Fig. 1

Experimental apparatus used to observe lasing from layered microdroplets.

Fig. 2
Fig. 2

Lasing spectra of a continuously evaporating droplet (a) before inclusion of a glass core and (b)–(d) after inclusion. The shell of the droplet sketch in (d) is not resolvable.

Equations (1)

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b = λ 2 2 π Δ λ tan - 1 ( m 2 - 1 ) 1 / 2 ( m 2 - 1 ) 1 / 2 ,

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