Browsing by Author "Hoogland H."

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Open Access
Ablation-cooled material removal with ultrafast bursts of pulses
(Nature Publishing Group, 2016) Kerse C.; Kalaycıoğlu, H.; Elahi, P.; Çetin B.; Kesim, D. K.; Akçaalan, Ö.; Yavaş S.; Aşık, M. D.; Öktem B.; Hoogland H.; Holzwarth, R.; Ilday, F. Ö.
The use of femtosecond laser pulses allows precise and thermal-damage-free removal of material (ablation) with wide-ranging scientific, medical and industrial applications. However, its potential is limited by the low speeds at which material can be removed and the complexity of the associated laser technology. The complexity of the laser design arises from the need to overcome the high pulse energy threshold for efficient ablation. However, the use of more powerful lasers to increase the ablation rate results in unwanted effects such as shielding, saturation and collateral damage from heat accumulation at higher laser powers. Here we circumvent this limitation by exploiting ablation cooling, in analogy to a technique routinely used in aerospace engineering. We apply ultrafast successions (bursts) of laser pulses to ablate the target material before the residual heat deposited by previous pulses diffuses away from the processing region. Proof-of-principle experiments on various substrates demonstrate that extremely high repetition rates, which make ablation cooling possible, reduce the laser pulse energies needed for ablation and increase the efficiency of the removal process by an order of magnitude over previously used laser parameters. We also demonstrate the removal of brain tissue at two cubic millimetres per minute and dentine at three cubic millimetres per minute without any thermal damage to the bulk.
Open Access
Non-thermal material and tissue processing with 100 MHz and 500 MHz repetition rate bursts
(IEEE, 2013) Kerse, Can; Kalaycıoğlu, Hamit; Akaalan O.; Eldeniz, Y.B.; İlday, F. Ömer; Hoogland H.; Holzwarth, R.
There are a number of applications that would avail a pulse pattern in the form of closely grouped and uniformly spaced pulses, i.e., bursts [1]. Closely grouped pulses with pulse to pulse separation in the order of a few nanoseconds have a potential for increasing material removal rates [2] and thereby reducing the thermal effects. Besides, keeping the burst repetition period in the order of thermal relaxation time has the advantage of keeping the overall average power at lower levels in order to prevent the cumulative heating of the material. © 2013 IEEE.