Femtosecond laser writing and integrated device characterisation
The central piece of this laser is a Satsuma laser with a harmonics generation module (1030, 515 and 346 nm, 220 fs, 12 W average power at fundamental wavelength, rep. rate up to 2 MHz) which is coupled to two fabrication apparatus for laser direct writing: one devoted to optical fibre processing and another for planar substrates laser writing.
3D laser direct writing unit for planar substrates
This system is composed of four main blocks: power control, beam expansion and polarisation control, writing head, imaging and sample positioning. The X-Y movement is ensured by two Aerotech ABL1000 stages while the writing lens is mounted in a PI piezoelectric z-stage with a travel length of 400 m. The system is controlled with software that has been internally developed.
Laser writing system for Bragg gratings in optical fibres
The system for fibre processing is based on a linear Aerotech ABL1000 stage where the fibre is mounted and has the same blocks of the system for planar formats. The system is completely controlled using LabVIEW-written software.
Integrated optical device characterisation set-up
This system is based on the MDE881 - Elliot Gold™ Series Professional Workstation multiaxis positioning system for fibre-device coupling with a piezo-control DALi unit with automatic alignment features. The system has multiple wavelengths (1550 tuneable, 1300, 830 and 633 nm), polarisation control, infrared camera for mode profiling, multiple photodetectors, UV curing source and components for V-groove coupling blocks attachment.