
What makes my laser mode hop?
Theoretical knowledgeMode hops are often provoked by external influences as laser case temperature, length drifts of the laser resonator, injection current and optical feedback. And as a matter of fact, mode hops often result from attempts to tune the wavelength of a laser. Let’s see here the two main causes behind laser mode hopping: temperature and injection current. Temperature The laser cavity can support many different wavelengths or longitudinal modes. In laser diodes, these modes are separated by typically 10 to…