Related Programs and Projects
Two portable 532 nm optical frequency standards stabilized at iodine molecular line have been established in our laboratory. Two self-developed semi-nonplanar monolithic solid state lasers with excellent frequency and power characters are used as laser sources. A sealed box is adopted to hold the laser which suppresses the dither produced by ambient disturbance; The 1.8 m absorption length is obtained by using a 4-pass strategy in a 45 cm iodine cell in order to improve the signal-to-noise ratio. The residual amplitude modulations are suppressed by dynamically controlling the temperature of the crystal in electro-optic modulator (EOM).