852nm窄带滤光片外腔反馈半导体激光器的优化

Optimization of 852-nm External-Cavity Diode Laser with Narrow-bandwidth Filter

外腔半导体激光器是激光光谱学、原子物理学及量子光学领域广泛应用的光源。本文介绍我们研制的利用超窄带宽滤光片作为激光纵模选择元件且反馈量可变的猫眼型852nm外腔半导体激光器（IFECDL）。旋转窄带滤光片的角度,激光波长粗调范围为14nm。利用光纤延时自差拍法测量了窄带滤光片外腔半导体激光器的线宽,单滤光片进行选频的IF-ECDL线宽约为211kHz,双滤光片情形的IF-ECDL线宽约为187kHz。激光频率连续调谐范围大于1.5 GHz,获得了铯原子D2线的两组饱和吸收光谱。所研制的IF-ECDL可应用于精密光谱测量、光通信、激光冷却与俘获铯原子等方面。

External-cavity diode lasers have been light sources widely used in the field of Laser spectroscopy,atomic physics and quantum optics.In this paper,a robust,stable,and acoustically inert852 nm external-cavity diode laser（IF-ECDL） with ultra-narrow bandwidth filter as the laser Longitudinalmode selection element and a cat-eye Lens has been developed.The range of laser wavelength isabout 14 nm by rotating narrow-band filter.The linewidth of the laser has been investigated experimentallybasedonthefiber-delayedacousto-optic modulator（AOM）shiftedself-heterodyne scheme.And the linewidth of The ECDL with a single filter as longitudinal mode selection element is 211 kHz and that with the dual filters is 187 kHz.The homemade IF-ECDL is used for the spectral measurement,and the laser frequency can be continuously tuned more than 1.5 GHz to obtain two sets of saturation absorption spectra.ofcesium atom.The developed IF-ECDL lasers can be applied in precision-spectroscopy,optical communications,laser cooling and trapping of cesium atoms.