Unidirectional, dual-comb lasing under multiple pulse formation mechanisms in a passively mode-locked fiber ring laser

Abstract

Abstract:Dual-comb lasers from which asynchronous ultrashort pulses can be simultaneously generated have recently become an interesting research subject. They could be an intriguing alternative to the current dual-laser optical-frequency-comb source with highly sophisticated electronic control systems. If generated through a common light path traveled by all pulses, the common-mode noises between the spectral lines of different pulse trains could be significantly reduced. Therefore, coherent dual-comb generation from a completely commonpath, unidirectional lasing cavity would be an interesting territory to explore. In this paper, we demonstrate such a dual-comb lasing scheme based on a nanomaterial saturable absorber with additional pulse narrowing and broadening mechanisms concurrently introduced into a modelocked fiber laser. The interactions between multiple soliton formation mechanisms result in unusual bifurcation into two-pulse states with quite different characteristics. Simultaneous oscillation of pulses with four-fold difference in pulsewidths and tens of Hz repetition rate difference is observed. The coherence between these spectral-overlapped, picosecond and femtosecond pulses is further verified by the corresponding asynchronous cross-sampling and dual-comb spectroscopy measurements.

Combination of Adaptive Sampling Terahertz Dual-Comb Spectroscopy with a Free-Running Single-Cavity Dual-Comb Fiber Laser

“…THz-DCS systems and optical DCS systems. Recently, advances in the endeavor to generate a pair of frequency combs from a free-running single-cavity laser [22][23][24][25][26][27][28][29][30][31] have shown great potential towards this goal. By propagating through the same cavity, the dual optical combs experience almost the same disturbances, and the commonmode fluctuations thereby prevent the decline of the mutual coherence between the dual combs.…”

Adaptive-sampling near-Doppler-limited terahertz dual-comb spectroscopy with a free-running single-cavity fiber laser

“…Various schemes have been investigated to further reduce the complexity of THz-DCS and optical DCS systems. Recently, advances in the endeavor to generate a pair of frequency combs from a free-running single-cavity laser [19][20][21][22][23][24][25][26][27][28] have shown great potential toward this goal. By propagating through the same laser cavity, the dual-optical combs experience almost the same disturbances, and the common-mode fluctuations thereby prevent the decline of the mutual coherence between the dual combs.…”

Computational Doppler-limited dual-comb spectroscopy with a free-running all-fiber laser

“…The burgeoning field of single-cavity dual-comb (SCDC) lasers is constantly being enriched with new concepts. To date, the most popular fiber-based SCDC generation mechanisms employ bidirectional mode-locking of a ring cavity [17][18][19][20] , dual-wavelength lasing [21][22][23][24][25] , and non-linear pulse shaping mechanisms 26 . Their full spectroscopic potential, however, has been weakly exploited to date.…”