Femtosecond-laser-encoded distributed-feedback color center laser in lithium fluoride single crystal

Confocal laser scanning microscopy of active color centers based strips induced on LiF by low energy electron beams

“…We have shown that CCs were generated in a surface layer about 2.5 lm thick with a maximum in their depth distribution located at about 1.3 lm below the crystal surface. The proposed method looks very powerful to reconstruct the depth profile of the laser active defects, emitting in the visible range, but also their full spatial distribution in a tridimensional space, allowing check and optimization of the broad-band emitting channel waveguides realized in this material [16]. This novel measurement technique could be easily extended to the spatial characterization of luminescent optical waveguides in transparent SiO 2 substrates with submicron resolution.…”

Laser direct writing: Enabling monolithic and hybrid integrated solutions on the lithium niobate platform

“…Its success lies not only in its unsurpassed aptitude for realizing three‐dimensional devices but also in its remarkable material‐independence that enables cross‐platform solutions 10: since the pioneering experiments of direct writing, inscription into laser active material has always been an important benchmark 10, 24. The versatility of direct laser writing has enabled a multitude of waveguide lasers in rare‐earth‐doped glasses 24–27 and crystals 28–32. An important milestone was to incorporate Bragg reflectors for distributed feedback 33.…”

Effect of pulse width and fluence of femtosecond laser on the size of nanobump array

“…In this experiment, L $ 1.7 mm was used. This system has advantages in easy alignment and wide interfering region www.elsevier.com/locate/apsusc Applied Surface Science 253 (2007) 6555-6557 compared to the beam correlation system using mirror beam splitter [7,10]. A ultra-short laser system, of which the center wavelength was 780 nm, was used.…”

“…On the other hand, structures with precise period in the order of wavelength, such as Bragg grating and distributed-feedback laser, have been fabricated by using interference of laser [3,4]. Recently, interference pattern of femtosecond laser was directly processed on a bulk surface by using femtosecond laser processing [5][6][7][8][9][10]. Among them, quite interesting structure of hollow nanobump array was found to be generated from metallic thin film processed by interfering femtosecond laser [8].…”