A simple scheme is described for demonstrating laser generation of ($\lambda$ = 570 nm) in an ethanol solution of rhodamin 6G excited by a small N$_2$ laser LGI-21 ($P$ = 3kW, $\lambda$ = 337 nm). The solution is placed into a cell of 4--5 mm thickness with a silver or aluminum mirror and a quartz window at the ends. Excitation is produced by a beam focused by a spherical lens through the quartz window. Radiation from the dye laser leaves the cell at a small angle in the direction opposite to the exciting beam through the same lens and this produces collimated radiation which is then aimed in the desired direction by deflecting mirrors.

RT Journal
T1 A simple dye laser for demonstrations
A1 Ageev,L.A.
PB Physics-Uspekhi
PY 1981
FD 10 Jul, 1981
JF Physics-Uspekhi
JO Phys. Usp.
VO 24
IS 7
SP 633-634
DO 10.1070/PU1981v024n07ABEH004873
LK https://ufn.ru/en/articles/1981/7/h/