The microchip lasers, being sources of coherent light, suffer from one serious drawback: low spatial quality of the beam, strongly reducing the brightness of emitted radiation. Attempts to improve the beam quality, such as pump-beam guiding, external feedback, either strongly reduce the emission power, or drastically increase the size and complexity of the lasers. Here we propose that specially designed photonic crystal in the cavity of a microchip laser, can significantly improve the beam quality. We experimentally show that a microchip laser, due to spatial filtering functionality of intracavity photonic crystal, improves the beam quality factor M2 reducing it by factor of 2, and thus increase the brightness of radiation by a factor of 4. This comprises a new kind of laser, the "photonic crystal microchip laser", a very compact and efficient light source emitting high spatial high brightness radiation.
D. Gailevicius, V. Koliadenko, V. Purlys, M. Peckus, V. Taranenko, and K. Staliunas, "Photonic crystal microchip laser," Proc. SPIE 10090, Laser Resonators, Microresonators, and Beam Control XIX, 100901L (Presented at SPIE LASE: February 02, 2017; Published: 20 February 2017); https://doi.org/10.1117/12.2252647.
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