Compensation of thermal nonlinear effect in hybrid microsphere resonators

Chengfeng Xie; Danfeng Cui; Jun Tang; Chenglong Shang; Tianen Zhang; Chenyang Xue; Jun Liu

Compensation of thermal nonlinear effect in hybrid microsphere resonators

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Author(s): Chengfeng Xie ^{1, 2} ; Danfeng Cui ^{1, 2} ; Jun Tang ^{1, 2} ; Chenglong Shang ¹ ; Tianen Zhang ² ; Chenyang Xue ^{1, 2} ; Jun Liu ^{1, 2}
- Affiliations: 1: Key Laboratory of Instrumentation Science and Dynamic Measurement, North University of China, Ministry of Education, Taiyuan 030051, People's Republic of China;
  2: Laboratory of Science and Technology on Electronic Test and Measurement, Taiyuan 030051, People's Republic of China
Source: Volume 9, Issue 9, September 2014, p. 609 – 612
DOI: 10.1049/mnl.2014.0223 , Online ISSN 1750-0443

Received 02/05/2014, Accepted 11/08/2014, Revised 19/07/2014, Published 15/09/2014

A hybrid structure with higher linearity to compensate the thermal refraction effect based on a ruby microsphere resonator is proposed and has been realised. The thermal refractive effect of the hybrid structure is theoretically and experimentally demonstrated, which showed that it is limited by the diameter of the resonator and the Q factor. By increasing the diameter, the transmission spectrum experiences a transition from blueshift to redshift induced by thermal absorption and when it is equal to a specific value the thermal refraction effect can be reduced or even eliminated. Experiments showed that there is no shift with varying input optical power since the thermal refraction of ruby can be completely compensated at the diameter of the microsphere d = 1.5 μm and Q = 2.3 × 10⁶ when the KD-310 coated thickness is 60 μm. This reported work shows that the structure could be used to improve stability and is sensitive in high-Q resonators for applications in laser, biosensor and nonlinear optics.

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Compensation of thermal nonlinear effect in hybrid microsphere resonators

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