mode hopping
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2021 ◽  
Vol 29 (4) ◽  
pp. 299-306
Author(s):  
Sazzad M. S. Imran ◽  
H. M. Asif Tanmay ◽  
Razia Sultana


2021 ◽  
Vol 9 ◽  
Author(s):  
Lei Ge ◽  
Ning Yang ◽  
Jian Wang ◽  
Weidong Chu ◽  
Suqing Duan ◽  
...  

Self-mixing interference (SMI) in terahertz quantum cascade lasers (THz QCLs) is one of the significant approaches for coherent THz imaging and sensing techniques. Here, the output characteristics of SMI in distributed feedback (DFB) THz QCLs from the index-to the gain-coupling regimes are studied using the coupled wave theory and the multi-mode rate equation method. A mode hopping phenomenon is found to occur when the DFB coupling factor changes from index-coupling to gain-coupling, and the characteristics of the self-mixing signals of DFB-QCLs change greatly with this mode hopping. With the modulus of the coupling factor fixed and its argument varied from 0 to π/2, an extreme point of the self-mixing frequency and power signals of DFB-QCLs is found at π/9 due to the mode hopping. For index-coupling dominated DFB-QCLs, both the varying ranges of the self-mixing frequency signals and amplitudes of power signals increase with increasing DFB coupling factor argument. For gain-coupling dominated DFB-QCLs, with increasing argument value, the amplitude of the self-mixing power signal increases, but the varying range of the self-mixing frequency signal decreases. With the argument of the coupling factor fixed, we also found that the varying ranges of the self-mixing frequency signals decrease with increasing modulus for both index-coupling dominated and gain-coupling dominated DFB-QCLs. For index-coupling dominated DFB-QCLs, the amplitudes of the self-mixing power signals decrease with increasing modulus; however, the amplitudes of the self-mixing power signals of gain-coupling dominated DFB-QCLs increase. With the argument of the coupling factor fixed, for index-coupling dominated DFB-QCLs, we found that the varying ranges of the self-mixing frequency signals and amplitudes of power signals decrease with the increasing modulus. For gain-coupling dominated DFB-QCLs, with the coupling factor modulus increasing, the varying ranges of the self-mixing frequency signals decrease, however, the amplitudes of the self-mixing power signals increase. These results may help with the application of DFB-QCLs to self-mixing interferometers.



Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 848
Author(s):  
Praveen K. J. Singaravelu ◽  
Sharon M. Butler ◽  
Robert N. Sheehan ◽  
Alexandros A. Liles ◽  
Stephen P. Hegarty ◽  
...  

We present a design methodology for hybrid lasers to realise mode-hop free operation by controlling the cavity mode spacing. In this study, a compact hybrid photonic crystal laser (H-PhCL) was employed which allowed a reduction of the Fabry–Perot length of the laser cavity and eliminated the need for an active mode stabilisation mechanism in order to realise mode-hop free operation. The H-PhCL was formed by butt-coupling a reflective semiconductor optical amplifier (RSOA) with a two-dimensional silicon (Si) photonic crystal (PhC) cavity. Continuous stable single frequency operation with >40 dB side-mode suppression ratio (SMSR) of the laser was achieved for gain currents of up to 100 mA, i.e., up to four times the threshold current. The shorter length of the laser cavity enabled single frequency operation due to the selection of a single longitudinal mode by the PhC narrowband reflector. Various longitudinal mode spacing regimes were studied to explain the mode-hop free characteristics of the H-PhCL. The proposed hybrid laser design methodologies can be adapted to eliminate mode-hopping in laser wavelength.



2021 ◽  
Vol 1818 (1) ◽  
pp. 012155
Author(s):  
Rasha Salah Abbas ◽  
Ayser A. Hemed
Keyword(s):  


2021 ◽  
pp. 137-167
Author(s):  
Wenchi Cheng ◽  
Liping Liang ◽  
Wei Zhang ◽  
Hailin Zhang


2020 ◽  
Vol 125 (3) ◽  
Author(s):  
Vladimir Klinshov ◽  
Dmitry Shchapin ◽  
Otti D’Huys


2020 ◽  
Vol 13 (6) ◽  
pp. 1153-1162 ◽  
Author(s):  
Zhijian Fang ◽  
Zhicong Huang ◽  
Hang Jing ◽  
Fei Liu


Author(s):  
Liping Liang ◽  
Wenchi Cheng ◽  
Wei Zhang ◽  
Hailin Zhang


2019 ◽  
Vol 151 (17) ◽  
pp. 175101 ◽  
Author(s):  
Chunhe Li ◽  
Leijun Ye
Keyword(s):  


2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Nikita Porwal ◽  
Anulekha De ◽  
Sucheta Mondal ◽  
Koustuv Dutta ◽  
Samiran Choudhury ◽  
...  
Keyword(s):  


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