Corneal ablation with picosecond laser pulses at 211 and 263 nm

Xin-Hua Hu; Tibor Juhasz

doi:10.1117/12.178551

23 June 1994 Corneal ablation with picosecond laser pulses at 211 and 263 nm

Xin-Hua Hu, Tibor Juhasz

Proceedings Volume 2126, Ophthalmic Technologies IV; (1994) https://doi.org/10.1117/12.178551
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

Laser ablation of human and rabbit corneas has been studied at 211 and 263 nm with 25 ps pulses. The pulses are obtained from the 4th and 5th harmonics of the output of a Nd:YLF laser system. This system provides laser pulses with maximum pulse energy of 25 (mu) J at 211 nm and 31 (mu) J at 263 nm simultaneously on a cornea at a repetition rate of 1 kHz. The linear incisions and morphology of the collateral tissue damage have been examined by electron microscopy. The dependence of the etch rate on laser fluence has been measured at both of wavelengths. The ablation threshold for human cornea is determined to be 3.0+/- 0.6mJ/cm² at 211 nm while the thresholds for rabbit cornea are 2.3+/- 0.5mJ/cm² at 211 nm and 8.0+/- 2mJ/cm² at 263 nm. We compare these results with the existing data on the corneal ablation by nanosecond UV pulses and discuss the deficiency of the photochemical model. A model of plasma ablation assisted by chromophore absorption has been proposed to interpret the experimental results.

Citation Download Citation

Xin-Hua Hu and Tibor Juhasz "Corneal ablation with picosecond laser pulses at 211 and 263 nm", Proc. SPIE 2126, Ophthalmic Technologies IV, (23 June 1994); https://doi.org/10.1117/12.178551

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