CBSE Class 12-science Answered

Dear student,

I, we use a different material, notably an alloy of aluminium and gallium arsenide (indium gallium arsenide phosphide is another popular choice). Electrons are injected into the diode, they combine with holes, and some of their excess energy is converted into photons, which interact with more incoming electrons, helping to produce more photons—and so on in a kind of self-perpetuating process called resonance. This repeated conversion of incoming electrons into outgoing photons is analogous to the process of stimulated emission that occurs in a conventional, gas-based laser.