METHOD OF ALIGNING THREE-MIRROR RESONATOR OF GAS LASER Russian patent published in 2011 - IPC H01S3/86 H01S3/02 

FIELD: physics.

SUBSTANCE: first resonator is formed by first semi translucent output mirror and second mirror translucent for wavelength with high gain ((λ=1.15 mcm, and λ=3.39 mcm) and mirror opaque for wavelength with low gain (λ=0.63 mcm), and active element arranged between said mirrors. Second resonator is formed by aforesaid first mirror and third mirror with high reflection and gain. Space between second and third mirrors is visually closed. Proposed method comprises aligning first resonator using the screen with diaphragm and dissipated light source. After generation, alignment is carried out to maximum power on wavelength of λ=0.63 mcm. Third mirror holder is secured on the side of second mirror. At the distance of ≈10 mm from said holder, third mirror is arranged aligning appliance. Third mirror is aligned using radiation coming out from first resonator with wavelength of λ=0.63 mcm unless beams reflected from second and third mirrors are focused at one point. Alignment results in disappearance of λ=0.63 mcm radiation due to occurrence of competing IR-radiation with wavelength of λ=3.39 mcm. Then, screen with diaphragm and additional laser are arranged on outer side of third mirror for visible beam to be directed via diaphragm onto outer surface of third mirror. Beam reflected from the mirror is marked on the screen. Now mirror is removed from aligning appliance and fixed on the holder. Third mirror is again aligned unless reflected visible beam is aligned with said mark. At the laser output, generation on λ=0.63 mcm is replaced by generation on IR-wavelengths. Further alignment of third mirror is carried out unless maximum output power on 1.15 mcm and 3.39 mcm wavelengths is reached.

EFFECT: short and simple alignment.

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