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搭建了一个中心波长为1340 nm、扫频速度为30 k Hz的光纤型窄瞬时线宽扫频激光光源,光源相位和光强稳定性高,扫频范围为10 nm,半峰全宽为6 nm,瞬时线宽小于0.018 nm,输出平均光功率为9.1 m W。实验扫频激光光源在傅里叶域锁模技术的基础上,使用精密度为5578、窄透射窗口的法布里-珀罗滤波器(FFP-TF)作为调谐滤波器,以腔内增益介质的自发辐射为背景光,经过单模长光纤后,到达FFP-TF并对腔内的激光进行调谐滤波,最后稳定地输出窄瞬时线宽的扫频激光。讨论了影响光源瞬时线宽的因素。搭建的窄瞬时线宽扫频激光光源具有极高的精密度和稳定性,可直接应用于对分辨率要求比较高的高速分子光谱学、分子吸收光谱学等领域。
An optical fiber type narrow instantaneous linewidth swept laser source with a center wavelength of 1340 nm and a scanning frequency of 30 k Hz is constructed. The phase angle and light intensity of the light source are stable. The sweep range is 10 nm and the full width at half maximum nm, the instantaneous linewidth is less than 0.018 nm, and the average output optical power is 9.1 mW. Based on the Fourier-domain mode-locked technique, the experimentally-swept laser light source uses a Fabry-Perot filter (FFP-TF) with a narrow transmission window of 5578 and a tunable filter with an aperture of gain medium Of the spontaneous emission as the background light, after the single-mode fiber length, to reach the FFP-TF and the cavity laser tuning filter, and finally stable output narrow-bandwidth laser sweep frequency. The factors affecting the instantaneous line width of the light source are discussed. The narrow instantaneous linewidth swept laser source constructed with high precision and stability can be directly applied to high-resolution molecular spectroscopy and molecular absorption spectroscopy with high resolution requirements.