Absorption spectra of wide-gap semiconductors in their transparency region
نویسندگان
چکیده
The linear absorption spectra of GaP, TiO2, ZnSe, and ZnS are measured in their transparency range using a twocolor, excite-probe Z-scan. ZnS has the lowest absorption coefficient ( 10 5 cm ) in the wavelength range 840–900 nm, making it an excellent material for use as a luminescence extracting lens in semiconductor laser cooling experiments. Direct observation of two-photon absorption in ZnSe using only low power, continuous laser beams is also reported. 2003 Elsevier B.V. All rights reserved. PACS: 78.20.Ci; 78.20.Nv; 42.70.Km; 42.65Jx
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