Improved spectral characteristics of 980 nm broad area slotted Fabry-Perot diode lasers

A novel broad area slotted Fabry-Perot diode laser is designed and fabricated.Using a new semianalytical method,we introduce effective refractive index perturbations in the form of etched slot features into a conventional 980 nm broad area Fabry-Perot cavity,and the spectral characteristics of the device are expected to be noticeably improved.A low density of slot features is formed by using standard optical lithography and inductively coupled plasma dry etching.The experimental results show that the full spectral width at half-maximum is less than 0.4 nm,meanwhile,the thermal shift of the emission spectrum is decreased from 0.26 to 0.07 nm/℃over a temperature range of 10 to 60℃.The improved spectral characteristics of the device are proved to be attributed to such slotted Fabry-Perot laser structures.