Exhibit 23.1




               CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS


     We  have  issued  our  report dated May 5, 2003, accompanying the financial
statements  included  in  the Annual Report of APA Optics, Inc. on Form 10-K for
the  year  ended  March  31,  2003.  We  hereby  consent to the incorporation by
reference  of  said report in the Registration Statements of APA Optics, Inc. on
Forms  S-8 (File No. 333-74214, effective November 30, 2001; File No. 333-44500,
effective  August  25,  2000; File No. 333-44488, effective August 25, 2000; and
File  No.  333-44486,  effective  August  25,  2000).



/s/GRANT THORNTON LLP


Minneapolis,  Minnesota
June  27,  2003