CHEMICAL CW LASERS WITH AN EXTENDED ACTIVE MEDIUM

We consider the principal results of the investigations 
of the last few years on increasing the lasing length of supersonic 
continuous chemical HF lasers by additionally diluting the active 
medium with an inert gas by feeding helium into different regions 
of the nozzle and active medium. The investigations were carried out 
with the use of models of HF lasers equipped with nozzle units of 
three different designs based on a three-jet scheme of mixing components. 
In the course of the investigations, active media with a length of 
up to 12.5 cm with a high optical quality providing high energy characteristics 
of the laser have been obtained, and for the first time a large-aperture 
output beam with a cross section close to a square one measuring 10 x 11 cm 
has been realized.

We consider the principal results of the investigations 
of the last few years on increasing the lasing length of supersonic 
continuous chemical HF lasers by additionally diluting the active 
medium with an inert gas by feeding helium into different regions 
of the nozzle and active medium. The investigations were carried out 
with the use of models of HF lasers equipped with nozzle units of 
three different designs based on a three-jet scheme of mixing components. 
In the course of the investigations, active media with a length of 
up to 12.5 cm with a high optical quality providing high energy characteristics 
of the laser have been obtained, and for the first time a large-aperture 
output beam with a cross section close to a square one measuring 10 x 11 cm 
has been realized.