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Proceedings Paper

Diffraction-limited 577 nm true-yellow laser by frequency doubling of a tapered diode laser
Author(s): Mathias Christensen; Mariafernanda Vilera; Danny Noordegraaf; Anders K. Hansen; Thomas Buß; Ole B. Jensen; Peter M. W. Skovgaard
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Paper Abstract

A wide range of laser medical treatments are based on coagulation of blood by absorption of the laser radiation. It has, therefore, always been a goal of these treatments to maximize the ratio of absorption in the blood to that in the surrounding tissue. For this purpose lasers at 577 nm are ideal since this wavelength is at the peak of the absorption in oxygenated hemoglobin. Furthermore, 577 nm has a lower absorption in melanin when compared to green wavelengths (515 − 532 nm), giving it an advantage when treating at greater penetration depth. Here we present a laser system based on frequency doubling of an 1154 nm Distributed Bragg Reflector (DBR) tapered diode laser, emitting 1.1 W of single frequency and diffraction limited yellow light at 577 nm, corresponding to a conversion efficiency of 30.5%. The frequency doubling is performed in a single pass configuration using a cascade of two bulk non-linear crystals. The system is power stabilized over 10 hours with a standard deviation of 0.13% and the relative intensity noise is measured to be 0.064 % rms.

Paper Details

Date Published: 15 February 2018
PDF: 7 pages
Proc. SPIE 10516, Nonlinear Frequency Generation and Conversion: Materials and Devices XVII, 1051604 (15 February 2018);
Show Author Affiliations
Mathias Christensen, Norlase ApS (Denmark)
Technical Univ. of Denmark (Denmark)
Mariafernanda Vilera, Norlase ApS (Denmark)
Technical Univ. of Denmark (Denmark)
Danny Noordegraaf, Norlase ApS (Denmark)
Anders K. Hansen, Technical Univ. of Denmark (Denmark)
Thomas Buß, Norlase ApS (Denmark)
Ole B. Jensen, Technical Univ. of Denmark (Denmark)
Peter M. W. Skovgaard, Norlase ApS (Denmark)

Published in SPIE Proceedings Vol. 10516:
Nonlinear Frequency Generation and Conversion: Materials and Devices XVII
Konstantin L. Vodopyanov; Kenneth L. Schepler, Editor(s)

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