Investigation of spectral characteristics of solitary diode lasers with integrated grating resonator

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This report examines the properties of high-power DFB diode lasers emitting at 780 nm which shall be used for high-precision spectroscopy of ultra-cold Rubidium atoms. Consequently, research efforts were aiming to provide both, high output power and high spectral short-term stability (low shortterm line width). For this purpose, the short-term line width of a DFB laser has been analyzed with heterodyne and self-delayed heterodyne methods. By optimizing the laser parameters (chip length, coupling coeffi cient and coating of the coupling facet) these lasers achieved excellent performance in terms of stable single-mode operation at high output power and small line width. The best results were delivered by 3 mm long DFB lasers with a 95% refl ectivity coating of the rear facet and a 5% refl ectivity coating of the front facet and a coupling coeffi cient of approximately 2 cm-1. These lasers show an output power of 270 mW and an intrinsic line width of 20 kHz (10 μs) in stable single-mode operation. This is a world-wide unique combination of output power and intrinsic line width for DFB diode lasers at this wavelength.

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Thanh Phuong Nguyen

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