OTHER FACILITIES | HRR LASER | TECHNICAL FEATURES
- The Ti:Sapphire oscillator (SpectraPhysics Mai Tai) emits pulses with a temporal duration of around 100 femtoseconds and with a central wavelength around 800 nanometers. Its pumping laser is a Spectra Physics Milennia (CW 532nm). The repetition rate is 84 MHz, and the average power is >400mW.
- The Ti:Sapphire regenerative amplifier is pumped by an Empower 30 (pulsed laser at 532 nm) at 1 kHz. The total energy per shot is 5 mJ once compressed, and the duration is below 120 femtoseconds.
- A final singlepass Ti:Sapphire amplifier is pumped by an Empower 45 (Neodimium doubled to green) at 1 kHz. The total energy per shot is 7 mJ once compressed, and the duration is below 120 femtoseconds.
HRR Laboratories' Layout (click to see)
The optical table (1800x900mm) is as close as possible to the laser room to avoid beam instabilities. Therea are two micropositioning systems formed each other by a three axes (XYZ) stage connected to a programmable multi-axis controlled by a mechanical shutter and by an optical attenuator respectively. An auxiliary imaging system allows the positioning of the beam laser in the selected target area and allows the control in realtime of the sample processing. Furthermore, there is other micro possitioning system with galvanometer scanners for a best laser beam control, a faster processing and a greater reproductivity approaching to the industrial environment.
Work Station 02.- General Purpose
This is a very versatile experimental area with a big optical table (1200x2400mm) for toher processing works as single-shot for LITD applications, micromachining with laser filamentation or other more basic tyypes of processing.
Work Station 03.- Trepanning and automatization processes
It is an isolated room with a robust optical table. The setup has been designed to operate with samples of larger dimensions and to produce larger scale microstructures (10-100 um). In the trepanning system the laser beam is deflected by rotating optical wedges that causes the beam to impinge on the sample at controlled angles and perform a circular trajectory. In that way, circular structures can be produced with controlled conicity and dimension.
X–Ray Laboratory – Workstation 04
An ultraintense laser can be focalized to reach electric fields higher than the electric field that binds the electron to the nucleus. When such electric field interacts with matter, the concept of atom disappears, and we obtain a plasma.
In our case, a beamline of 3.5 mJ of the HRR laser is focalized with an off-axis parabola over a solid target to reach intensities of 1017 W/cm2. This is the λ3 regime, where lasers with pulses of few lambdas are focalized to an area of the order of λ2. We obtain electrons of some keV and x-rays generated by bremsstrahlung and K-a lines of the ions.
The accelerated electron and x-rays generated in this process are offered by the CLPU to its user community, which usually demands these sources for promising medical applications, for instance, novel radiation therapies.
Workstation 05 – General purposes
It is open to all users for their research and the search of new applications tahta require a femtosecond laser, e.g. activation of organic catalysts, micromachining with laser filamentation and other more basic types of processing. Beside this is also the experimental space used for training activities.