In 2008, DTU Fotonik purchased a new amplified femtosecond laser system providing 3.5 mJ/pulse energies of 35 fs duration at a repetition rate of 1000 Hz. At a peak power of 100 GW, it is one of the most intense sources of light in Denmark and enables a vast array of experiments that both explore and use nonlinear optics. Initially housed in a smaller starter lab, the laser system was moved to its permanent home in a newly refurbished laboratory in the fall of 2009. The system includes two optical parametric amplifiers capable of generating continuously tunable femtosecond pulses from 530 – 2800 nm.
The TeraWatt laboratory is an open facility to DTU Fotonik researchers, which currently supports projects in transient terahertz spectroscopy, nonlinear terahertz spectroscopy, terahertz microscopy and novel pulse compression techniques. The laser system resides on a custom built optical bench consisting of 5 joined tables covering 17 m2, in a room that is temperature and humidity controlled as well as acoustically isolated for comfort.
The Laser System
- Millenia solid state pump – 5 W pump for Tsunami
- Tsunami – Ti:sapphire oscillator: 0.7 W, < 35 fs, 800 nm, 76 MHz rep rate
- Empower – Q-switched Nd:YLF pump for Spitfire – 30 W at 527 nm.
- Spitfire Pro XP – Regenerative amplifier with room for 2nd stage amplification
- Two TOPAS-C, Light Conversion – Supercontinuum based optical parametric amplifiers (one optimized for 1 mm) with external mixers (SHS, SHI, SFI). Tuning range from 530 nm – 2.8 μm.
- Two synchronized Toptica femtosecond lasers operating at 1550 nm providing 100 fs pulses at an average power of about 400 mW.
- Closed cycle He cryostat with vacuum system.
- Ocean Optics fiber coupled spectrometers.
- Bruker FTIR (wavelength range from 8000 cm-1 – 30 cm-1).
- A wide range of detection electronics.
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