Interference filter based external-cavity diode laser with combined dual interference filters and largely adjustable feedback range
Interference filter based external-cavity diode laser with combined dual interference filters and largely adjustable feedback range
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DOI：
10.1088/1402-4896/ad0943
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发表时间：
2023-07
期刊：
影响因子：
2.9
通讯作者：
Rui Chang;Jun He;Junmin Wang
中科院分区：
文献类型：
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作者：
Rui Chang;Jun He;Junmin Wang
外腔半导体激光器(ECDL)在激光光谱学、原子物理和量子光学中被广泛用作光源。本研究采用组合双窄带干涉滤光片作为激光纵模选择元件，实现了国产852 nm可变反馈ECDL。窄带IF的组合，主要用于目前商用的窄带IF，其半高全宽(FWHM)约为0.5 nm，适用于780-895 nm。为了获得更窄的半高宽，我们设计了不同的窄带IF组合，并将其应用于ECDL中。双窄带迭代函数系统的组合进一步减小了激光器的线宽。利用线宽约为10 kHz的高精细度法布里-珀罗腔测量了激光的线宽。在相同反馈下，单IF-ECDL的激光线宽约为176 kHz，而双IF-ECDL的激光线宽约为96 kHz。此外，我们还从实验上验证了随着反馈的增加，激光线宽变窄，调谐范围变大的结果。研制的双中频ECDL具有窄线宽和波长可调的能力，可用于中性原子的精密光谱、冷却和俘获。
External-cavity diode lasers (ECDL) are widely used as light sources in laser spectroscopy, atomic physics, and quantum optics. This study demonstrated a home-made 852–nm ECDL with variable feedback, using the combined dual narrow-band interference filters (IFs) as the laser longitudinal mode selection element. The combination of narrow-band IFs, mainly for the current commercially available narrow-band IFs with the full width at half maximum (FWHM) of approximately 0.5 nm for 780-895 nm. We designed different narrow-band IFs combinations to achieve a narrower FWHM, and applied them in the ECDL. The combination of the dual narrow-band IFs further reduces the laser linewidth. We measured the laser linewidth using a high-finesse Fabry-Perot cavity with a linewidth of approximately 10 kHz. The laser linewidth is approximately 176 kHz for the Single-IF-ECDL and 96 kHz for the Dual-IF-ECDL with the same feedback. In addition, we have experimentally verified the results of narrower laser linewidth and larger tuning range with increase in the feedback. The developed Dual-IF-ECDL has the capability of narrow linewidth and wavelength tunability and can be applied to precision spectroscopy, cooling and trapping of neutral atoms.