Laiyang Dang, Ligang Huang, Leilei Shi, Fuhui Li, Guolu Yin, Lei Gao, Tianyi Lan, Yujia Li, Lidan Jiang, Tao Zhu. Ultra-high spectral purity laser derived from weak external distributed perturbation[J]. Opto-Electronic Advances, 2023, 6(2): 210149

Search by keywords or author
- Opto-Electronic Advances
- Vol. 6, Issue 2, 210149 (2023)

Fig. 1. Principle of laser spectral purification based on distributed weak perturbation. (a ) A novel laser configuration. (b ) Evolution of laser phase fluctuation and noise coupling strength with different round trips. (c ) Spectral distribution at different noise levels.

Fig. 2. Simulation results of laser linewidth evolution. (a ) Output linewidth evolution with the feedback length under different feedback coefficients. (b ) Linewidth curve at the different feedback ratios. Two-dimensional pseudocolor maps of the spectra vary (c ) with the length and (d ) with feedback ratio.

Fig. 3. An on-chip laser system based on weak external distributed perturbation. ISO: optical isolator; OC: optical coupler; PD: photoelectric detector; DAS: data acquisition system.

Fig. 4. Power spectra of the RF signal generated by beating two distributed feedback DFB lasers and spectral purity. (a ) Comparison curves of the frequency spectrum from beat frequency signal. (b ) Lorentz fitting curve of the linewidth with a distributed feedback. (c ) Comparison curves of the frequency noise PSD. (d ) Comparison curves of the RIN spectrum, where a red curve indicates the compressed result.

Fig. 5. Coherence of on-chip laser with different feedback ratios. (a ) Evolution curves of the frequency noise PSD under different feedback ratios. (b ) Evolution curves of output linewidth with the feedback ratio.

Fig. 6. Self-adaptive compression process of laser linewidth. (a ) Transient spectrum and (b ) corresponding Lorentzian linewidth when switching on the feedback. (c ) Transient spectrum and (d ) corresponding Lorentzian linewidth when tuning the frequency of the main laser cavity.

Set citation alerts for the article
Please enter your email address