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Common approach is used to calculate band due to strong-coupling largepolaron (SCLP) photodissociation in ARPES and in optical conductivity (OC)spectra. It is based on using the coherent-states representation for the phononfield in SCLP. The calculated positions of both band maximums are universalfunctions of one parameter - the SCLP binding energy Ep: ARPES band maximumlies at binding energy about 3.2Ep; the OC band maximum is at the photon energyabout 4.2Ep. The half-widths of the bands are mainly determined by Ep andslightly depend on Frohlich electron-phonon coupling constant: for its value6-8 the ARPES band half-width is 1.7-1.3Ep and the OC band half-width is2.8-2.2Ep. Using these results one can predict approximate position of ARPESband maximum and half-width from the maximum of mid-IR OC band and vice versa.Comparison of the results with experiments leads to a conclusion thatunderdoped cuprates contain SCLPs with Ep=0.1-0.2 eV that is in good conformitywith the medium parameters in cuprates. The values of the polaron bindingenergy determined from experimental ARPES and OC spectra of the same materialare in good conformity too: the difference between them is within 10 percent.

Correlation of optical conductivity and ARPES spectra of strong-coupling large polarons and its display in cuprates