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Near-infrared absorption spectroscopy of dissociated iodine vapor with semiconductor laser

We present an experimental arrangement for the investigation of the spectra of a iodine in the spectral region around 1315 nm. The work was motivated by the need to assemble a stabilized laser system emitting at the wavelength matching with the transition used in iodine laser optical amplifiers where the laser frequency stability is limited by the linewidth of this 2P1/2-2P3/2 hyperfine transition. This stabilized laser system followed by an electro-optic Q-switch and fibre-optic preemplifiers will serve as a master oscillator for a pulsed high-power laser Asterix IV in the PALS facility.