The kHz femtosecond laser materials processing facility enables fundamental and applied research in a variety of different fields, including integrated optics, advanced materials science, photochemistry, life sciences, and manufacturing. The ultrafast transfer of energy from laser pulses to the material ensures higher spatial (sub-micrometer) and temporal (sub-picosecond) selectivity of the materials processing, as well as a significantly reduced heat input compared to longer laser pulses. The low repetition rate reduces cumulative heating between pulses, making this facility ideal for the research on heat-sensitive applications such as ablative processing and light-matter interaction with biological specimens. The high intensities that can be generated with femtosecond laser pulses enable the exploration of the non-linear absorption mechanisms utilized for the processing of dielectric materials. The ability to utilize single femtosecond pulses allows an implementation of pump-probe experiments for time-resolved studies of various laser-matter interaction phenomena.
In addition to the fundamental wavelength at 800 nm and its second harmonics at 400 nm, the facility is equipped with a femtosecond optical parametric amplifier (fs-OPA) that extends the output wavelength range into the near- and mid-IR. The ability to tune the frequency of the ultrafast laser light can be utilized for laser processing of wide band gap materials and spectroscopic studies.
The primary utilization of the facility within the Laser & Plasma Laboratory at the Townes Laser Institute covers the fabrication of 3D volumetric optical and microfluidic structures in transparent materials, high-precision machining of different classes of materials, and time-resolved studies of laser-matter interaction in different materials.
Facility Equipment
Femtosecond Chirped Pulse Amplification (CPA) laser light source
Spectra Physics Spitfire
- Max pulse Energy >1 mJ
- Pulse duration ~110 fs
- Wavelength 800 nm, 400 nm
- Repetition rate 0 – 1 kHz, single pulses
Femtosecond Optical Parametric Amplifier (fs-OPA)
Coherent OPerA
- Wavelength range 1.1 – 2.6 micrometer
- Max pulse energy >0.2 mJ
3D computer-controlled positioning system
Newport VP-25XA
- Spatial resolution 100 nm
- Max travel 25 mm
- Max speed 25 mm/s
- LabView programming environment for custom motion and shutter control
- Imaging system for reflection and transmission illumination modes
- Vertical beam delivery for dry and liquid materials processing