Question

In He-Ne loser the most favourable ratio of Helium toNe on for satisfactory laser action is

Options

• 1 : 4

• 4 : 1

• 1 : 7

• 9 : 1

Answer 1

9 : 1

Explanation:

The laser's gain medium, as suggested by its name, is a 9 : 1 mixture of helium and neon gases contained at low pressure in a glass envelope.