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We present cosmological results from the statistics of lensed quasars in theSloan Digital Sky Survey (SDSS) Quasar Lens Search. By taking proper account ofthe selection function, we compute the expected number of quasars lensed byearly-type galaxies and their image separation distribution assuming a flatuniverse, which is then compared with 7 lenses found in the SDSS Data Release 3to derive constraints on dark energy under strictly controlled criteria. For acosmological constant model (w=-1) we obtain\Omega_\Lambda=0.74^{+0.11}_{-0.15}(stat.)^{+0.13}_{-0.06}(syst.). Allowing wto be a free parameter we find\Omega_M=0.26^{+0.07}_{-0.06}(stat.)^{+0.03}_{-0.05}(syst.) andw=-1.1\pm0.6(stat.)^{+0.3}_{-0.5}(syst.) when combined with the constraint fromthe measurement of baryon acoustic oscillations in the SDSS luminous red galaxysample. Our results are in good agreement with earlier lensing constraintsobtained using radio lenses, and provide additional confirmation of thepresence of dark energy consistent with a cosmological constant, derivedindependently of type Ia supernovae.

The Sloan Digital Sky Survey Quasar Lens Search. III. Constraints on Dark Energy from the Third Data Release Quasar Lens Catalog