Born in 1984, Han ZHANG received his Bachelor of Science degree at Department of Physics, Wuhan University, 2006 and then started his Ph.D at Nanyang Technological University, Singapore under Prof. TANG Dingyuan with research focused on soliton dynamics of fiber lasers. He experimentally observed several interesting soliton pulses including : bright-bright high order vector soliton, dark soliton pulse, bright-dark vector solitons and domain wall solitons. Furthermore, he demonstrated graphene’s ultra-fast photonics application in fiber lasers. He is an active reviewer of OSA, IOP, IEEE,Elsevier and APS (72 reviews in total) and selected as the most active reviewer by OSA. He is awarded by Chinese Government as the Outstanding Ph.D Abroad, 2010.
Obsessed by soliton’s universal nature, he continued the soliton research in OPERA Photonics. It is expected that full understanding on the dark soliton family could be eventually achieved with the help of soliton experts at OPERA and ONT. His total publications : 41, total ciations:700 and H factor : 14.
Scalar dark pulse fiber lasers
In an all-normal dispersion fiber laser cavity with an intra-cavity polarizer, single polarized dark pulses could be automatically formed if the cavity was adjusted in high nonlinearity and non-mode-locking regime. This kind of dark pulses might be related to the nonlinear Schrödinger equation (NLSE) which intrinsically allowed the solution of dark solitons in normal dispersions. However, its faithful formation mechanism remains unclear and needs further explorations.
Domain wall induced dark pulse fiber lasers
Marc Haelterman firstly predicted that coupling of two waves (different polarizations or different frequencies) could cause the formation of domain wall structure as well as the emegence dark soliton-like dips along the total field. In fiber lasers,almost independent of dispersion signs, such domain-wall-like switching and dark pulse train could be also identified. It also required much efforts to uncover the hidden truth.
Qiaoliang Bao, Han Zhang, Bing Wang, Zhenhua Ni, Candy Haley Yi Xuan Lim, Yu Wang, Ding Yuan Tang & Kian Ping Loh, "Broadband graphene polarizer" Nature Photonics 5, 411–415 (2011)
Han Zhang, et. al., “Dual-wavelength domain wall solitons in a fiber ring laser,” Optics Express, 19, 3525-3530 (2011).
H. Zhang, et. al., “Vector dark domain wall solitons in a fiber ring laser’’ OPTICS EXPRESS 18, 4428 (2010).
D. Y. Tang, H. Zhang, et. al. “Observation of high-order polarization-locked vector solitons in a fiber laser”,Physical Review Letters, 101, 153904 (2008).
H. Zhang, et. al.,“Dark pulse emission of a fiber laser’’ Physical Review A, 80, 045803 (2009).
H. Zhang, et. al., "Observation of polarization domain wall solitons in weakly birefringent cavity fiber lasers", PHYSICAL REVIEW (Brief report) B 80, 052302 (2009).