A narrow linewidth of the emitted laser radiation is of interest for a variety of applications. These include frequency-stabilized diode lasers used in spectroscopy, nonlinear frequency conversion as well as high-precision laser measurement technology.
The basis of frequency stabilization are periodic Bragg grating structures located in the laser cavity. These gratings are introduced into the lasers during the growth process as overgrown gratings or subsequently as surface gratings (for detailed information on processes and methods, see GaAs laser diodes). We are also researching various laser concepts for frequency stabilization to meet application-specific requirements on the spectral quality, output power and beam quality.