Abstract
Results are presented of a study on an external-cavity semiconductor laser consisting of a 1.3 mu m buried-heterostructure laser diode with an antireflection coated facet and a 4 mm GRINROD. Due to its enclosed compact structure and strong optical feedback, it provides a stable single mode, with a mainside mode ratio of more than 30 dB, and is not sensitive to environmental perturbations. No mode jumping occurred during 12 h of continuous observation. The measured linewidth of 90 kHz is in good agreement with the newly developed theoretical calculation. >
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