Development of primary length standards
Institute of Physics
Ministry of Science and Environmental Protection
National Development Project
Nowadays, length standards are lasers, stabilized on some of appropriate molecular or atomic transitions. The aim of this project is to develop length standards according to recommendations of CIPM (International Comission for Weights and Measures). One of our goals is to develop a pair of stabilized, second harmonic, Nd-YAG lasers, as 532nm length standard. Active stabilization will be performed by saturated apsorption on iodine vapors. At the moment, we have constructed 1064 nm diode pumped Nd - YAG laser, which produced 375 mW of optical power at 1064 nm. We are developing a
method appropriate to force the laser into single longitudinal mode. Second harminic conversion is under development too. Also, a pair of stabilized diode lasers will be developed as 778 nm length standard. Laser will be activeli stabilized on two photon transition of rubidium. Until now, mechanics of the laser is completed and mounting of the laser and optical components is underway. Rubidium cell, with magnetic shielding and detection system is under development.