[Japan Soc. Appl. Phys Digest of Papers. Microprocesses and Nanotechnology 2001. 2001 International Microprocesses and Nanotechnology Conference - Shimane, Japan (31 Oct.-2 Nov. 2001)] Digest of Papers. Microprocesses and Nanotechnology 2001. 2001 International Microprocesses and Nanotechnology Conference (IEEE Cat. No.01EX468) - Holographic grating formation by wet etching in amorphous As/sub 40/Ge/sub 10/Se/sub 15/S/sub 30/ thin film