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The Euclid space telescope will observe ~10^5 strong galaxy-galaxygravitational lens events in its wide field imaging survey over around half thesky, but identifying the gravitational lenses from their observed morphologiesrequires solving the difficult problem of reliably separating the lensedsources from contaminant populations, such as tidal tails, as well aspresenting challenges for spectroscopic follow-up redshift campaigns. Here Ipresent alternative selection techniques for strong gravitational lenses inboth Euclid and the Square Kilometer Array, exploiting the strong magnificationbias present in the steep end of the Halpha luminosity function and HI massfunction. Around 10^3 strong lensing events are detectable with this method inthe Euclid wide survey. While only ~1% of the total haul of Euclid lenses, thissample has ~100% reliability, known source redshifts, high signal-to-noise anda magnification-based selection independent of assumptions of lens morphology.With the proposed Square Kilometer Array dark energy survey, the numbers ofreliable strong gravitational lenses with source redshifts can reach 10^5.

Up to 100,000 reliable strong gravitational lenses in future dark energy experiments