Determination of the concentrations of oxygen and water vapour, and of the temperature of the active medium in a chemical oxygen—iodine laser by intracavity laser spectroscopy

Intracavity spectroscopy, with the aid of a Al₂O₃:Ti³⁺ laser, was used to determine the concentrations of H₂O and O₂ and the temperature of the active medium of an oxygen–iodine laser. When duration of the Al₂O₃:Ti³⁺ laser pulses was 120 μs, the sensitivity of the method was 6×10¹⁴ and 3 × 10¹⁴ cm^–3 for H₂O and O₂, respectively. The error in the determination of the oxygen concentration in the range 2 × 10¹⁵ – 10¹⁶ cm^–3 did not exceed 5% at temperatures 200 – 500 K and the temperature error did not exceed 25 K.