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Rivera C.A.,University of Southern California | Bradforth S.E.,University of Southern California | Tempea G.,Femtolasers Produktions GmbH
Optics Express | Year: 2010

Typical femtosecond pulse compression of deep ultraviolet radiation consists of prism or diffraction grating pair chirp compensation but, both techniques introduce higher-order dispersion, spatial-spectral beam distortion and poor transmission. While negatively chirped dielectric mirrors have been used to compress near infrared and visible pulses to <10 fs, there has been no extension of this technique below 300 nm. We demonstrate the use of Gires-Tournois interferometer (GTI) negative dispersion multilayer dielectric mirrors designed for pulse compression in the deep ultraviolet region. GTI mirror designs are more robust than chirped mirrors and, can provide sufficient bandwidth for the compression of sub- 30-fs pulses in the UV wavelength range. Compression of a 5 nm (FWHM) pulse centered between 266 and 271 nm to 30 fs has been achieved with less pulse broadening due to high-order dispersion and no noticeable spatial deformation, thereby improving the resolution of ultrafast techniques used to study problems such as fast photochemical reaction dynamics. © 2010 Optical Society of America. Source


Le T.,Femtolasers Produktions GmbH | Bethge J.,Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy | Skibina J.,Chernyshevsky Saratov State University | Steinmeyer G.,Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy
Optics Letters | Year: 2011

Delivery of sub-20-fs pulses through 80 cm of a chirped photonic crystal fiber with chirped-mirror precompensation is experimentally demonstrated. The pulses out of the fiber are within 15% of the bandwidth limit and exhibit a pulse energy of 1 nJ. Peak powers amount to 50 kW directly out of the fiber. Measurements indicate a good pulse contrast with little satellite content. The combination of a specially designed hollow fiber with chirped mirrors sets a new record for the pulse durations directly delivered through a fiber. © 2011 Optical Society of America. Source


Borchers B.,Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy | Lucking F.,Femtolasers Produktions GmbH | Steinmeyer G.,Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy | Steinmeyer G.,Tampere University of Technology
Optics Letters | Year: 2014

A method for improved performance of feed-forward carrier-envelope phase stabilization in amplified laser sources is presented and experimentally demonstrated. The phase stabilization scheme is applicable for a broad range of repetition rates spanning from subhertz to 100 kHz. The method relies on driving an acousto-optic frequency shifter by few-cycle transients. The phase of these transients suitably controls the grating phase of the generated index grating inside the shifter material. This approach removes beam pointing as well as amplitude noise issues observed in continuously driven feed-forward schemes. The synthesis of these gratings can be understood as the acoustic equivalent of mode-locking or acoustic frequency combs. © 2014 Optical Society of America. Source


Patent
Femtolasers Produktions GmbH | Date: 2013-01-15

Method and device for optical inspection of a sample using spectral interferometry, wherein a beam (2) emitted by a radiation source (1) is directed onto the sample (5) and a reference beam (2) is directed onto a reference sample (4), and the spectral interference of both beams after being reflected on the samples or after passing the samples is recorded by means of a spectrograph (6); the interferogram I() thus obtained is numerically derived with respect to the angular frequency . For the function I() thus obtained the zeros


Patent
Femtolasers Produktions GmbH | Date: 2012-11-15

A multifunctional laser device configured to be applicable as such in each of: multiple photon processes, nano structuring processes, optical coherence tomography, Terahertz (THZ) spectroscopy, THz imaging; or a combination of such processes; and comprising a mode-locked linear (X or Z-folded) fs laser resonator having a repetition rate of at least 300 MHz and 600 MHz at most and, thus, a corresponding short resonator length, said fs laser resonator further being a dispersive mirrors cavity having an average negative GDD (Group Delay Dispersion) in the spectral range of the laser operation, and being arranged to generate laser pulses with a pulse width of less than 30 fs, and comprising a pump laser operating at an optical output pump power of less than 2 W.

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