In the known three-wavelength distance-measuring systems two optical wavelengths are used and a microwave is added for air-humidity influence consideration. In our research, which proceeds from results obtained at the National Research Laboratory of Metrology (Japan), the possibility of constructing a three-optical-wavelength ranging system is discussed. We investigate different versions by using a CO2 laser as the source of the third wavelength. Analysis shows that the three-wavelength system with two lasers (YAG:Nd 3+ laser, which yields first- and second-harmonic radiation, and a CO2 laser) seems to be optimum. A possible schematic structure of the three-wavelength YAG–CO2 laser system is given.
© 1994 Optical Society of America
Original Manuscript: October 14, 1993
Revised Manuscript: March 1, 1994
Published: November 1, 1994
Anatol N. Golubev and Alexander M. Chekhovsky, "Three-color optical range finding," Appl. Opt. 33, 7511-7517 (1994)