Peng Yi-Bo, Dai Zhecheng, Lin Kai-Li, Wang Peng-Lei, Shen Zhijian, Chen Baile, Grillot Frédéric, Wang Cheng
Opt Lett. 2024 Jun 1;49(11):3142-3145. doi: 10.1364/OL.525636.
Near-infrared semiconductor lasers subject to optical feedback usually produce chaos with a broad bandwidth of a few GHz. However, the reported mid-infrared interband cascade lasers (ICLs) only show chaos with a limited bandwidth below 1 GHz. Here we show that an ICL with optical feedback is able to generate broadband chaos as well. The mid-infrared chaos exhibits a remarkable bandwidth of about 6 GHz, which is comparable to that of the near-infrared counterpart. In addition, the spectral coverage in the electrical domain reaches as high as 17.7 GHz. It is found that the chaos bandwidth generally broadens with increasing feedback ratio and/or increasing pump current of the laser, while it is insensitive to the feedback length.
受到光反馈的近红外半导体激光器通常会产生带宽为几吉赫兹的宽带混沌。然而，已报道的中红外带间级联激光器（ICL）仅表现出带宽限制在1吉赫兹以下的混沌。在此我们表明，具有光反馈的ICL也能够产生宽带混沌。中红外混沌展现出约6吉赫兹的显著带宽，这与近红外同类激光器相当。此外，电学领域的频谱覆盖高达17.7吉赫兹。研究发现，混沌带宽通常会随着反馈比的增加和/或激光器泵浦电流的增加而变宽，而对反馈长度不敏感。
