Three-dimensional Ag₂S cubes for switchable multi-wavelength ultrashort pulse application

Abstract

Three-dimensional (3D) materials are widely used in optoelectronics, thermodynamics and ultrafast fiber lasers because of their excellent nonlinear optical properties. Silver sulfide (Ag 2 S) is a kind of 3D material with a unique cubic structure and large absorption coefficient. In this paper, a double-balance detection system is used to measure the saturation absorption intensity of Ag 2 S as 226.6 MW cm −2 and the modulation depth as 13.9%. In the ring fiber laser, Ag 2 S is used as a saturable absorber (SA) to obtain a stable dual-wavelength mode locking. The center wavelengths of the mode locking are 1536.9 and 1544.5 nm, and the corresponding 3 dB bandwidths are 1.3 and 1.5. nm. By adjusting the polarization controller, a tuning process from two wavelengths to multiple wavelengths is realized, and the tunable width is 13.1 nm. This phenomenon is due to the combined effect of birefringence and nonlinear effects in the cavity. To our knowledge, this is the first report of a multiplexed fiber laser with Ag 2 S as a SA. The emergence of this result provides a valuable reference information for the multifunctional compact fiber laser, and the formed system can be applied in the fields of fiber sensing, telecommunications and optical communication.

Silver sulfide as Q‐switcher and mode‐locker in Erbium‐doped fiber laser cavity

“…17 It offers excellent features including its unique layered structure with broad and large optical absorption and amazing metal-like ductility. 18 Ag 2 S has also gained significant consideration as SA attributed to its high optical absorption as well as a direct bandgap of 0.9-1.1 eV. 19 In this paper, passively Q-switched and modelocked fiber lasers utilizing Ag 2 S thin film as SA were demonstrated.…”

“…More recently, another chalcogenide compound, silver sulfide (Ag 2 S) has also gained rapid interest, especially for ultrafast photonics 17 . It offers excellent features including its unique layered structure with broad and large optical absorption and amazing metal‐like ductility 18 . Ag 2 S has also gained significant consideration as SA attributed to its high optical absorption as well as a direct bandgap of 0.9–1.1 eV 19 …”

Ag sputtering–assisted phase formation of Ag2S‐decorated ZnS composite sheets and their photoactive performances

“…Furthermore, the Ag 2 S can be synthesized via diverse routes. [16][17][18][19][20] Ag 2 S has been widely integrated into other sulfides to form hybrids to improve the photoactive performance, and it demonstrates high chemical stability upon exposure to irradiation. [21][22][23] However, most chemical routes for synthesizing Ag 2 S involve the complex reaction process, and the use of specific precursors also limits the ease of the process.…”

“…Ag 2 S is a silver sulfide compound of n‐type semiconductor with a narrow bandgap, and it has stable optical and electronic properties. Furthermore, the Ag 2 S can be synthesized via diverse routes 16–20 . Ag 2 S has been widely integrated into other sulfides to form hybrids to improve the photoactive performance, and it demonstrates high chemical stability upon exposure to irradiation 21–23 .…”

Nonreciprocal transmission of multi-band optical signals in thermal atomic systems

“…Transmission and processing of multi-wavelength/band optical signals is an important issue in optical communications and processing. Optical devices for multi-wavelength applications have attracted intensive attention in recent years, such as multi-wavelength lasers [9][10][11][12][13] , multiplexing and communications [14,15] , imaging and sensors [16][17][18][19] , and photovoltaic devices [20] . It is also a very important subject to develop and design optical nonreciprocal devices such as optical isolators suitable for multi-wavelength applications [21,22] .…”