Vilnius University

Photonic Crystal Microchip Laser

Posted by Vilnius UniversityResponsive · Knowhow and Research output · Lithuania

Summary of the technology

The present technology allows to significantly improve the beam quality and brightness of radiation of a microchip laser, by inserting a specially designed photonic crystal in the cavity of a microchip laser. Technology could be applied in various types of microlasers, including semiconductor edge-emitting lasers and vertical-cavity surface-emitting lasers.

Vilnius University

Description of the technology

BACKGROUND

Microchip lasers are widely used in material processing, micromachining, light detection and ranging (LIDAR), spectroscopy, etc., where a very compact setup is necessary. Usually microchip lasers suffer from a low beam quality and limited brightness of the radiation, especially in high power operation regimes. The beam quality could be improved, for example, by using optical injection, external feedback, external gratings, external beam manipulation or other techniques, however, this results in a loss of the main advantage – the compactness and simplicity of the laser design.

TECHNOLOGY

The described technology is based on insertion of a specially designed photonic crystal (PhC) in the cavity of a microchip laser and can solve the beam quality and brightness problem for high pump power.PhC can affect the spatial beam propagation, causing such peculiarity as spatial (angular) filtering.PhC spatial filters can provide efficient filtering in extremely short propagation distances (typically around 200 μm). To get powerful beam of good spatial quality (single transverse mode beam) an axisymmetric (2D)PhC filter isutilised. A one-dimensional (1D) spatial filter, filtering in one transverse direction, can also be used to demonstrate the appearance of a beneficial filtering effect.PhC is fabricated via direct laser writing technique, using a femtosecondYb:KGW laser, in standard soda-lime microscope glass slide. The lateral dimensionsPhC filters is 200 μm, and the length is 188 μm. Inserting axisymmetricPhC filter in the cavity of a microchip laser, helps to maintain the same beam quality while having the power of emission almost 4 times higher than the laser withoutPhC filter (maximum power of 335 mW has been reached during an experiment). Thus the beam quality factor M2 is reduced by a factor of 2. Due to thePhC filter, the brightness of the emitted radiation is increased approximately by a factor of 3 [1].

BENEFITS

  • Possibility to reach 4 times higher power, while maintaining initial beam quality.
  • The beam quality factor M2 is twice lower, than alternatives without PhC filter.
  • 3 times higher brightness of the emitted radiation.
  • Due to intracavity PhC filter, there is no need to make laser bigger and more complex.
  • PhC filter is produced from easily obtainable standard microscope glass slide.

APPLICATION

PhC microchip lasers, produced according to the present technology, can be used in various applications:

  • Material processing;
  • Micromachining;
  • Ranging;
  • Light detection;
  • Spectroscopy;
  • Pollution monitoring;
  • Fluorescence measurements.

INTELLECTUAL PROPERTY

Invented in cooperation between Vilnius University, Polytechnic University of Catalonia and Kyiv Institute of Applied Optics: D.Gailevičius, V.Koliadenko,V.Purlys, M.Peckus, V.Taranenko, K.Staliūnas.

PUBLICATIONS

[1]Gailevicius, D.et al. Photonic Crystal Microchip Laser. Sci. Rep. 6, 34173; (2016).https://doi.org/10.1038/srep34173

Current development status

Laboratory prototypes

Technology Owner

Vilnius University

Research & Technology Organization

Related keywords

  • Micromachining, nanomachining
  • Materials Technology
  • Lighting, illumination
  • Lighting and signaling system
  • Detection and Analysis methods
  • Measurement and Detection of Pollution
  • Protecting Man and Environment
  • Measurements and Standards
  • Measurement Tools
  • Electronic measurement systems
  • Measurement devices
  • Laser Related
  • Chemicals and Materials
  • Pollution and Recycling Related
  • Industrial measurement and sensing equipment
  • spectroscopy
  • light detection
  • photonic crystal
  • material processing
  • ranging
  • detection
  • photonics
  • fluorescence measurements

About Vilnius University

Research & Technology Organization from Lithuania

Vilnius University is the largest Lithuanian higher education and research institution. We are open for collaborative research, contract research or any cooperation activities with partners from business and public organizations. Multidisciplinary approach on R&D activities at Vilnius University provides unique opportunity to incorporate methodologies, perspectives, data and concepts from all scientific fields – biomedical, physical sciences, technologies, social sciences and humanities. We believe that the right mix of shared intentions with our partners and clients, outstanding teams of university researchers and open access to modern R&D infrastructure deliver remarkable solutions that can change organizations, markets and society in general.

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