Power-scalable sub-100-fs Tm laser at 2.08 μm

Abstract

We report on a power-scalable sub-100-fs laser in the 2-µm spectral range using a Tm 3+ -doped 'mixed' (Lu,Sc) 2 O 3 sesquioxide ceramic as an active medium. Pulses as short as 58 fs at 2076 nm with an average output power of 114 mW at a pulse repetition rate of approximately 82.9 MHz are generated by employing single-walled carbon nanotubes as a saturable absorber. A higher average power of 350 mW at 2075 nm is obtained at the expense of the pulse duration (65 fs). A maximum average power of 486 mW is achieved for a pulse duration of 98 fs and an optical conversion efficiency of 22.3%, representing the highest value ever reported from sub-100-fs mode-locked Tm lasers.

Mn ions‐activated Gd3(Al,Ga)5O12 garnet solid‐solution ceramics: Cation substitution for dual wavelength red‐emission

“…To overcome the abovementioned challenges, phosphor ceramics, as monolithic platelets, are emerging as the best candidates owing to their better chemical and mechanical stability, and high thermal conductivity 8,10–13 . From a spectral perspective, Eu 2+ ‐doped nitride, CaAlSiN 3 :Eu 2+ (CANS:Eu) phosphor ceramic with a deep‐red emission peak at 650 nm can be used for high‐color‐rendering white LEDs for general lighting 14,15 .…”

“…8,9 To overcome the abovementioned challenges, phosphor ceramics, as monolithic platelets, are emerging as the best candidates owing to their better chemical and mechanical stability, and high thermal conductivity. 8,[10][11][12][13] From a spectral perspective, Eu 2+ -doped nitride, CaAlSiN 3 :Eu 2+ (CANS:Eu) phosphor ceramic with a deep-red emission peak at 650 nm can be used for high-color-rendering white LEDs for general lighting. 14,15 However, its synthesis conditions are rigorous because of its non-cubic crystal structures, which require oxygen isolation, high temperature, and an extremely high heating rate during the sintering process.…”