Er:YAG laser radiation in experimental ophthalmologic applications

Helena Jelinkova, Jiri Pasta, Jan Sulc, Michal Nemec, Mitsunobu Miyagi, Yi Wei Shi, Yuji Matsuura

Research output: Contribution to journalConference articlepeer-review

8 Citations (Scopus)


Er:YAG laser system generating a radiation in a free-running, long-pulse mode regime with an output energy up to 610 mJ and a wavelength in a mid-infrared region (2.94 μm) was used for ophthalmic micro-surgery. As a delivery system a cyclic olefin polymer-coated silver hollow glass waveguide was used. The delivery system was ended either by a focusing optics (CaF2 lens) or by a special sapphire tip, for a non-contact and contact treatment, respectively. The corneal ablation and perforation of a sclera tissue were examined for the energies from 5 mJ up to 280 mJ and from 1 to 10 pulses in the case of non-contact and contact preparation. The threshold energy for the sclera ablation was measured for the non-contact procedure to be 122 mJ (24.3 J/cm2) in the case when 1 pulse was used. For the contact preparation this threshold energy was 270 J (34.4 J/cm2) for 5 pulses used. The iris contact ablation threshold energy was measured to be 10 mJ (1.3 J/cm2) for 1 pulse. The results show the usability of the 2.94 μm radiation in the ophthalmic surgery.

Original languageEnglish
Pages (from-to)253-258
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2000
EventOphthalmic Technologies X - San Jose, CA, USA
Duration: 2000 Jan 222000 Jan 23


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