We report a soliton mode locked femtosecond oscillation with all-polarization maintaining erbuim doped fiber laser based on Carbon Nanowalls saturable absorber (CNWs SA). To improve the stability and the capability of the oscillator, the all-polarization maintaining(all-PM) fiber is generally used since PM fiber is tolerant of stretches and bends. The saturable absorber is an optical device that placed in a laser cavity to suppress continuous wave operation to promote cooperation between many modes to sustain ultrashort pulse operation. We apply CNWs for the material of SAs in our oscillator. CNWs are one of the nanocarbon materials, which are a high-aspect-ratio structure in the cross-section, where, although their width and height range in a few micrometers, the thickness is as small as ten nanometers or so. A sheet of CNWs is made up of nano-size graphite grain aggregates. Then CNWs structure is expected to have a high absorption to the incident light and large modulation depth due to a small number of carbon layers as well as CNT and Graphene. With this all-PM fiber laser oscillator based on CNWs SA, the soliton mode-locked laser oscillated with 66.3MHz repetition frequency and its spectrum width is 5.6nm in FWHM. Average output power is 8.1mW with 122.5mW laser diode pump power. In addition, the laser amplification system with erbium-doped fiber is constructed and amplifies the femtosecond pulse laser into 268.2mW and 3000mW pumping power.
KEYWORDS: Aerosols, Laser induced breakdown spectroscopy, Femtosecond phenomena, Cesium, LIDAR, Weapons of mass destruction, Signal detection, Classification systems, High power lasers, Spectroscopy
We propose a stand-off system that enables detection and classification of CBRNe (Chemical, Biological, Radioactive,
Nuclear aerosol and explosive solids). The system is an integrated lidar using a high-power (terawatt) femtosecond laser.
The detection and classification of various hazardous targets with stand-off distances from several hundred meters to a
few kilometers are achieved by means of laser-induced breakdown spectroscopy (LIBS) and two-photon fluorescence
(TPF) techniques. In this work, we report on the technical considerations on the system design of the present hybrid lidar
system consisting of a nanosecond laser and a femtosecond laser. Also, we describe the current progress in our
laboratory experiments that have demonstrated the stand-off detection and classification of various simulants. For the R
and N detection scheme, cesium chloride aerosols have successfully been detected by LIBS using a high-power
femtosecond laser. For the B detection scheme, TPF signals of organic aerosols such as riboflavin have clearly been
recorded. In addition, a compact femtosecond laser has been employed for the LIBS classification of organic plastics
employed as e-simulants.
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