Global positioning system- (GPS-) referenced optical frequency combs based on mode-locked lasers offer calibrations for length metrology traceable to international length standards through the SI second and the speed of light. The absolute frequency of an iodine-stabilized He–Ne laser [127I2R(127) 11–5 f component] was measured with a femtosecond comb referenced to a multichannel GPS timing receiver. The expected performance and limitations of GPS-referenced comb measurements are discussed.
© 2005 Optical Society of America
Original Manuscript: June 11, 2004
Revised Manuscript: September 10, 2004
Manuscript Accepted: September 10, 2004
Published: January 1, 2005
Richard W. Fox, Scott A. Diddams, Albrecht Bartels, and Leo Hollberg, "Optical frequency measurements with the global positioning system: tests with an iodine-stabilized He–Ne laser," Appl. Opt. 44, 113-120 (2005)