- Since a bias-T only allows to heat the laser, the emission wavelength
can only be increased (or emission wavenumber decreased), and output power
will decrease with increased bias current, due to the additional heating.
This means that the laser should be operated initially at lowest possible
temperature, and it reduces the number of lasers available for reaching a
given emission wavelength.
- Heating of the active zone will increase thermal stress of the laser,
therefore the expected lifetime will decrease more rapidly compared to
increasing the temperature of the laser submount and base in total. If
operation at only a fixed wavelength is needed, this should be adjusted
with the overall temperature control.
- Too high a DC bias current can immediately destroy the laser due to
catastrophic thermal roll-over. Therefore set-up of the bias current
has to be done only by instructed personnel, and after checking with
Alpes Lasers SA for allowed parameter ranges; otherwise warranty will
be lost.
