Jintian Lin1,2,†, Saeed Farajollahi3, Zhiwei Fang4, Ni Yao5,6..., Renhong Gao1,2, Jianglin Guan4,7, Li Deng4,7, Tao Lu3,*, Min Wang4,7, Haisu Zhang4,7, Wei Fang6,8,*, Lingling Qiao1,2 and Ya Cheng1,2,4,7,9,10,11,*|Show fewer author(s)
Author Affiliations
1Chinese Academy of Sciences (CAS), Shanghai Institute of Optics and Fine Mechanics (SIOM), State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-Intense Laser Science, Shanghai, China2University of Chinese Academy of Sciences, Center of Materials Science and Optoelectronics Engineering, Beijing, China3University of Victoria, Department of Electrical and Computer Engineering, Victoria, British Columbia, Canada4East China Normal University, School of Physics and Electronic Science, XXL—The Extreme Optoelectromechanics Laboratory, Shanghai, China5Research Center for Intelligent Sensing, Zhejiang Lab, Hangzhou, China6Zhejiang University, College of Optical Science and Engineering, The Interdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, Hangzhou, China7East China Normal University, State Key Laboratory of Precision Spectroscopy, Shanghai, China8Jiaxing Institute of Zhejiang University, Intelligent Optics & Photonics Research Center, Jiaxing, China9Shanxi University, Collaborative Innovation Center of Extreme Optics, Taiyuan, China10Shandong Normal University, Collaborative Innovation Center of Light Manipulations and Applications, Jinan, China11Shanghai Research Center for Quantum Sciences, Shanghai, Chinashow less
DOI: 10.1117/1.AP.4.3.036001
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Jintian Lin, Saeed Farajollahi, Zhiwei Fang, Ni Yao, Renhong Gao, Jianglin Guan, Li Deng, Tao Lu, Min Wang, Haisu Zhang, Wei Fang, Lingling Qiao, Ya Cheng, "Electro-optic tuning of a single-frequency ultranarrow linewidth microdisk laser," Adv. Photon. 4, 036001 (2022)
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Abstract
Single-frequency ultranarrow linewidth on-chip microlasers with a fast wavelength tunability play a game-changing role in a broad spectrum of applications ranging from coherent communication, light detection and ranging, to metrology and sensing. Design and fabrication of such light sources remain a challenge due to the difficulties in making a laser cavity that has an ultrahigh optical quality (Q) factor and supports only a single lasing frequency simultaneously. Here, we demonstrate a unique single-frequency ultranarrow linewidth lasing mechanism on an erbium ion-doped lithium niobate (LN) microdisk through simultaneous excitation of high-Q polygon modes at both pump and laser wavelengths. As the polygon modes are sparse within the optical gain bandwidth compared with the whispering gallery mode counterpart, while their Q factors (above 10 million) are even higher due to the significantly reduced scattering on their propagation paths, single-frequency lasing with a linewidth as narrow as 322 Hz is observed. The measured linewidth is three orders of magnitude narrower than the previous record in on-chip LN microlasers. Finally, enabled by the strong linear electro-optic effect of LN, real-time electro-optical tuning of the microlaser with a high tuning efficiency of ∼50 pm / 100 V is demonstrated.
