A high-speed optical coherence and Doppler tomography system suitable for real-time monitoring of the microstructural and microvascular tissue changes induced by laser thermal therapy is described. The performance of the system is demonstrated experimentally in vivo by noting the morphological change, manifest as an increase in the optical extinction coefficient, and the reduction in the blood flow during and after laser thermal therapy in an animal model.

07 Feb 2002·Journal of Physics D: Applied Physics

Phase laser intracavity spectroscopy

Author: Peshko, Igor

A method of metallic thin-film surface conductivity monitoring is proposed and realized.The method is based on the dependency of the single-frequency laser output on the position of a thin absorbing film in the linear cavity.The real and imaginary parts of the surface conductivity of Co and Cr thin (∼10 nm) films were measured for radiation with wavelength of ∼1 μm.

01 Jan 2001·International Congress on Applications of Lasers & Electro-Optics

Laser machining of silicon for photonics components

Author: Yashkir, Yuri ; Nantel, Marc ; Lee, Seong-Kuk ; Hockley, Bernard

Machining Si was a mainstay of the semiconductor industry for decades.While this has traditionally being done through wet chem. etching, other techniques are worth exploring.This is especially true for efforts in the pursuit of integrating photonics devices on a single chip to facilitate their production, for which a non-wet, noncontact, arbitrary-shape milling of Si would be best.The authors present the authors' latest work in the laser micromachining of Si.A kilohertz-repetition-rate diode-pumped Nd:YLF laser (in IR, green or UV modes) is focused on the surface of Si wafers in a Cl atm. for enhanced magnitude and control of the etching rate.In the Cl atm., much less debris is deposited on the surface around the cut, sub-damage threshold machining is achieved for a better control of the etching depth, and etching rates ranging from 20-300,000 μm³/s were measured.

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