Frequency stabilization in FBG external cavity semiconductor laser based on acetylene absorption method

Abstract

A frequency-stabilized 1.53 FBG external-cavity semiconductor laser by using acetylene absorption is presented and its basic principles are introduced. Graded refractive index fiber and pigtailed fiber are used in the absorption air chamber to enhance the coupling stability. The impact of the background power is eliminated by using the third-harmonic mode-locking technique. A lock-in amplifier is utilized to ensure that the output laser wavelength is locked at the C₂H₂ absorption line of 1530.37 nm. The frequency stability reaches 10⁻⁸ within 24 h.

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