Complete Frequency Domain Analysis for Linewidth of Narrow Linewidth Lasers

doi:10.3964/j.issn.1000-0593(2019)08-2354-06

CIOMP OpenIR

	Complete Frequency Domain Analysis for Linewidth of Narrow Linewidth Lasers
	X.Y.Qi; C.Chen; Y.Qu; X.Zhang; Y.Y.Chen; B.Wang; L.Liang
	2019
发表期刊	Spectroscopy and Spectral Analysis
ISSN	1000-0593
卷号	39 期号:8 页码:2354-2359
摘要	Traditional laser linewidth characterization is usually done by introducing a self-heterodyne technique. This technique is an optical fiber delay based on laser beat note, which generates a Lorentzian spectrum related to the linewidth of a laser. In order to obtain the complete characteristics of a laser linewidth and frequency noise spectrum in its frequency domain, a new method based on beta algorithm is proposed. The basic principles of the beta algorithm have been analyzed and explained at first. The relationship between frequency noise and laser linewidth in different frequency ranges are analyzed based on the Wiener-Khintchine theorem. When the cut-off frequency tends to be zero or infinity, the laser line shape evolves from Gaussian type to Lorentzian type. Meanwhile, the cut-off frequency of the conversion laser line shape has been deduced, which is represented by the frequency noise function, namely beta separation line. Secondly, the frequency noise spectral density has been measured with OE4000 test system. The frequency noise and the line shape of diode lasers are numerically simulated. In the low frequency region, where the noise level is much larger than its frequency, it produces a slower frequency modulation than that in the high frequency region. The linewidth of the laser is an integration of the frequency noise in the Gaussian line shape region. The error in linewidth calculation is smaller over the entire cut-off frequency range. Finally, a set of measured frequency noise power spectral density of a RIO' s laser was used to calculate the linewidth using the beta algorithm. When the frequency noise spectral density is greater than the beta separation line, the laser appears as a Gaussian line shape and the linewidth decrease with frequency banwidth; on the contrary, the laser shows a Lorentzian line shape, and the linewidth is fixed. Meanwhile, a delayed self-heterodyne measurement system with delay fiber of 50 km and frequency shift of 60 MHz is constructed. The measured linewidth of a RIO' s laser working under 110 mA inject current is about 1. 8 kHz, which is consistent with the calculated result of the beta algorithm, of which the frequency bandwidth is similar to 2. 8 kHz. In conclusion, beta algorithm is able to characterize the linewidth of any type of narrow line width laser, which is of great significance to the research on narrow linewidth lasers.
关键词	Laser linewidth,beta algorithm,Laser shape,Frequency noise,fiber laser,noise,Spectroscopy
DOI	10.3964/j.issn.1000-0593(2019)08-2354-06
收录类别	SCI ; EI
语种	中文
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/63115
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	X.Y.Qi,C.Chen,Y.Qu,et al. Complete Frequency Domain Analysis for Linewidth of Narrow Linewidth Lasers[J]. Spectroscopy and Spectral Analysis,2019,39(8):2354-2359.
APA	X.Y.Qi.,C.Chen.,Y.Qu.,X.Zhang.,Y.Y.Chen.,...&L.Liang.(2019).Complete Frequency Domain Analysis for Linewidth of Narrow Linewidth Lasers.Spectroscopy and Spectral Analysis,39(8),2354-2359.
MLA	X.Y.Qi,et al."Complete Frequency Domain Analysis for Linewidth of Narrow Linewidth Lasers".Spectroscopy and Spectral Analysis 39.8(2019):2354-2359.

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