We have demonstrated an anti-Stokes random laser emission at $\lambda \approx 885\mathrm{nm}$ in micrometer-size powder of $\mathrm{GaAs}$ . The maximal pumping wavelength, $\lambda =1300\mathrm{nm}$ , exceeded the lasing wavelength by nearly 50%. We conclude that both one- and two-photon pumping contribute to optical excitation of the material, with the two-photon pumping being a key process in creating the population inversion and gain.

© 2008 Optical Society of America

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