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We put forward a new procedure for measuring the spin of a black hole withunprecedented accuracy based on gravitational lensing of millisecond pulsars.The deflection angle of light increases by increasing the rotation parameter.For primary and secondary images the angular positions are larger for rotatingblack holes by an amount of the order of microarcseconds. Also, thedifferential time delay for the case of a rotating black hole is larger thanthat for the non-rotating case and the difference could be as large as a fewseconds. We show that this quantity could help us achieve an extremely precisemeasurement of the black hole spin, much more accurate than the current andnear future achievable estimation of black hole spin through other methods.

Measuring black hole spin through gravitational lensing of pulsars