Diffraction-limited 577 nm true-yellow laser by frequency doubling of a tapered diode laser

Mathias Christensen, Mariafernanda Vilera, Danny Noordegraaf, Anders Kragh Hansen, Thomas Buss, Ole Bjarlin Jensen, Peter M. W. Skovgaard

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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.
Original languageEnglish
Title of host publicationProceedings of SPIE
Number of pages7
Volume10516
PublisherSPIE - International Society for Optical Engineering
Publication date2018
Article number1051604
DOIs
Publication statusPublished - 2018
EventSPIE Photonics West LASE 2018: Real-time Measurements, Rogue Phenomena, and Single-Shot Applications III - San Francisco, United States
Duration: 27 Jan 20181 Feb 2018

Conference

ConferenceSPIE Photonics West LASE 2018
CountryUnited States
CitySan Francisco
Period27/01/201801/02/2018
SeriesProceedings of SPIE, the International Society for Optical Engineering
Volume10516
ISSN0277-786X

Keywords

  • Visible lasers
  • Tapered diode laser
  • Second harmonic generation
  • 577 nm

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