D. Richter et al., "Minimizing residual spectral drift in laser diode bars using femtosecond-written volume Bragg gratings in fused silica," Opt. Lett. 42, 623 (2017).
Ultrashort laser pulses are used to inscribe volume Bragg gratings (VBGs) into fused silica. These VBGs demonstrate excellent performance for the external stabilization of laser diode bars. The stabilized system emits at a wavelength of 969 nm with a signal width (FWHM) of 100 pm and shows a spectral drift as low as 24 pm for a change in output power of 45 W for a grating surface area of 10 mm2 .