Hollow fiber for flexible sub-20-fs pulse delivery.

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.

Numerical fringe pattern demodulation strategies in interferometry.

The performance of two different numerical frequency demodulation strategies for evaluating sampled fringe patterns in interferometric applications and optics is discussed. Namely, these techniques involve traditional Fourier filtering techniques and a strategy based on the Gabor wavelets. While the latter is found to be more precise, it is generally difficult to implement wavelet-based frequency demodulation with equal performance as methods based on the fast Fourier transform.