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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 8 — Apr. 12, 2010
  • pp: 8300–8310

Thermal and optical properties of the femtosecond-laser-structured and stress-induced birefringent regions in sapphire

Junko Morikawa, Akihiro Orie, Toshimasa Hashimoto, and Saulius Juodkazis  »View Author Affiliations


Optics Express, Vol. 18, Issue 8, pp. 8300-8310 (2010)
http://dx.doi.org/10.1364/OE.18.008300


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Abstract

Temperature diffusivity of laser micro-structured regions in sapphire is determined by a temperature wave method with a lateral resolution reduced to ~ 10 μm using a directly sputtered micro-sensor and heater. A record high reduction of the temperature diffusivity of sapphire by 12% from its (1.26±0.02)×10-5 m2/s in-bulk value inside the femtosecond laser-structured volumes is determined; in a BK7 glass (~ 4.8×10-7 m2/s), a 2% decrease of the thermal diffusivity has been observed. Origin of the reduction is consistent with disorder and scattering of phonons around the laser photo-modified micro-volumes. The stress-induced birefringence is directly measured by polariscopy together with its radial distribution, and azimuthal orientation of the polarization ellipsis near the laser structured regions in sapphire. The maximum birefringence of Δn≃1×10-3 is achieved without crack formation and corresponds to a local stress of ~ 1.3 GPa. The stress (and birefringence) decay radially with a single-exponential constant of τR = 24 μm while the azimuthal orientation of the polarization ellipsis is spiraling around the laser structured volume. Such structures are promising in waveguiding and lasing applications of optical vortices where spatial control of birefringence and optical activity are required.

© 2010 Optical Society of America

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(220.4000) Optical design and fabrication : Microstructure fabrication
(160.1245) Materials : Artificially engineered materials
(160.1585) Materials : Chiral media

ToC Category:
Materials

History
Original Manuscript: February 2, 2010
Revised Manuscript: March 26, 2010
Manuscript Accepted: March 29, 2010
Published: April 6, 2010

Citation
Junko Morikawa, Akihiro Orie, Toshimasa Hashimoto, and Saulius Juodkazis, "Thermal and optical properties of the femtosecond-laser-structured and stress-induced birefringent regions in sapphire," Opt. Express 18, 8300-8310 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-8-8300


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