Exhibit 23.1


            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


          We  have  issued  our  report  dated  June  15, 2004, accompanying the
     financial  statements  included in the Annual Report of APA Optics, Inc. on
     Form  10-K  for  the  year  ended  March 31, 2004. 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  29,  2004