Abstract
By using the second harmonic radiation of a 1543 nm diode laser, several predicted rovibronic transitions of molecular iodine were observed for the first time. We demonstrated that the absolute frequency of a 1534 nm external-cavity diode laser could be frequency-stabilized to a 1 MHz instability (for one second averaging time) by locking the frequency of the second harmonic generation to the dense rovibronic spectrum of 127I2. Our scheme shows one possible means of generating a frequency grid in the entire wavelength region of optical communications.
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