June 2017
Volume 58, Issue 8
Open Access
ARVO Annual Meeting Abstract  |   June 2017
Fiber Beam Delivery for Novel Ultrashort Femtosecond Laser Technologies
Author Affiliations & Notes
  • Vladimir G Lemberg
    Advanced R&D, Abbott Medical Optics, Santa Clara, California, United States
  • Saidur Rahaman
    Abbott Medical Optics, Milpitas, California, United States
  • Nima Khatibzadeh
    Abbott Medical Optics, Milpitas, California, United States
  • Alireza Malek Tabrizi
    Abbott Medical Optics, Milpitas, California, United States
  • Hong Fu
    Abbott Medical Optics, Milpitas, California, United States
  • Footnotes
    Commercial Relationships   Vladimir Lemberg, Abbott Medical Optics (E); Saidur Rahaman, Abbott Medical Optics (E); Nima Khatibzadeh, Abbott Medical Optics (E); Alireza Malek Tabrizi, Abbott Medical Optics (E); Hong Fu, Abbott Medical Optics (E)
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science June 2017, Vol.58, 5291. doi:
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    • Get Citation

      Vladimir G Lemberg, Saidur Rahaman, Nima Khatibzadeh, Alireza Malek Tabrizi, Hong Fu; Fiber Beam Delivery for Novel Ultrashort Femtosecond Laser Technologies
      . Invest. Ophthalmol. Vis. Sci. 2017;58(8):5291.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : Femtosecond lasers are widely used for various ophthalmic applications ranging from creating flaps in LASIK procedures, corneal lenticule incisions, creating pockets for the corneal inlays to cataract surgery. The use of conventional optical fiber laser beam delivery is a common and convenient way to deliver the laser energy to the target tissue. However, the uses of conventional fiber based beam delivery for ultrashort laser pulses are limited due to the optical fibers dispersion. The recent advances in development of the hollow-core photonic crystal fibers opened up new opportunities to build a flexible beam delivery configuration for novel femtosecond laser technologies.

Methods : The femtosecond laser (pulsewidth 100-200fs) was coupled into Kagome hollow-core photonic crystal fiber PMC-C-Yb-7C. We matched the laser beam waist to fiber mode field diameter and the numerical aperture of the fiber, using variable NA optical system to achieve the high coupling efficiency. The low NA fiber output beam was re-collimated and delivered to the scanning and high numerical aperture (NA 0.6) focusing system. We attempted to create variety of the corneal cuts, using the flexible delivery configuration.

Results : By using the variable NA optical system we have achieved the high (more than 94%) coupling efficiency and low (less than 2.5%) transmission losses (attenuation of -0.05 dB per meter at 1030 nm). Due to close to zero dispersion (~1 fs/nm/meter) at 1030 nm wavelength the femtosecond laser pulses were transmitted with virtually no pulse width broadening. Particular attention was given to the study the mechanical stability in the axial and radial directions as well as the beam quality and transmission losses as a function of the fiber bending radius. The high quality of the re-collimated beam, the high coupling efficiency and low transmission losses allowed us to demonstrate variety of corneal cuts ranging from flap, intrastromal lenticule and keratoplasty incisions and inlay pockets.

Conclusions : Our study demonstrated that the recent advances in development of the hollow-core photonic crystal fibers (zero dispersion at the design wavelength, absence of Fresnel reflections from the fiber-end faces high damage threshold and low transmission and bend losses) opened up new opportunities to build flexible beam delivery configuration for novel femtosecond laser technologies.

This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.

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