In this work, an Indium Antimonide-polyvinyl alcohol (InSb-PVA) film was fabricated, and its nonlinear characteristics were researched. The modulation depth intensity and saturation intensity were 13.61% and 2.02 MW/cm2, correspondingly. Based on InSb as a saturable absorber (SA), an erbium-doped fiber laser (EDFL) with passively Q-switched and mode-locked operation was generated. The Q-switched operation was achieved with a maximum pulse energy of 45.8 nJ and a minimum pulse duration of 4.3 μs. As the pump power rises, the repetition rate rises from 7.6 kHz to 25.05 kHz and the pulse duration falls from 20.1 μs to 4.3 μs. By adjusting the length of the single-mode fiber to manage the dispersion, a stable mode-locked EDFL with a maximum average output power of 8.03 mW and a central wavelength of 1566.54 nm was obtained. The experimental results fully demonstrated that InSb has remarkable nonlinear absorption performance and enormous potential for ultra-fast photonics devices.
The images acquired in haze conditions are significantly degraded due to the presence of atmospheric particles. These images have low contrast, poor visibility, and some information is lost as well. These characteristics severely hinder the further processing and the applications in which the images are being used. The polarimetric dehazing methods are effective for direct imaging and enhancing the imaging quality. In addition, polarimetric dehazing methods have the capability to cope with haze and other turbid mediums. Therefore, the polarimetric dehazing methods are extensively developed and used in different applications due to their superior performance. We present in detail the principles, the implementation techniques, and the advancements in the polarimetric dehazing methods. We believe that this work is the first in-depth review on the passive polarimetric dehazing methods.
The ultrashort, ultrahigh intensity pulse laser has been fully developed in past three decades. Chirped pulse amplification (CPA) system plays an important role in the generation of the ultrashort, ultrahigh intensity pulse laser. Pulse compression gratings (PCGs) are the key element of CPA system and determine the performance and lifetime of the whole system. We introduce the principle of CPA system and the performance requirements of PCGs. Then the development status of PCGs, including Au-coated grating, multilayer dielectric grating (MDG), and metal MDG, is fully reviewed. Finally, the development prospect of PCGs in the future is presented. Our study is helpful for comprehensive understanding of PCGs.
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