8 July 2004 A compact OPO/SFG laser for ultraviolet biological sensing
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Proceedings Volume 5332, Solid State Lasers XIII: Technology and Devices; (2004); doi: 10.1117/12.530292
Event: Lasers and Applications in Science and Engineering, 2004, San Jose, Ca, United States
A compact parametric oscillator (OPO) with intracavity sum-frequency generation (SFG) to generate 293 nm UV laser irradiation, was developed. The OPO/SFG device was pumped by a 100 Hz Nd:YAG laser (1064 nm) of own design, including subsequent second harmonic generation (SHG) in an external periodically poled KTiOPO4 (KTP) crystal. The whole system could be used to deliver more than 30 μJ laser irradiation per pulse (100 Hz) at 293 nm. The UV laser light was introduced in an optical fiber attached to a sample compartment allowing detection of fluorescence emission using a commercial spectrometer. Aqueous samples containing biomolecules (ovalbumin) or bacteria spores (Bacillus subtilis) were excited by the UV-light at 293 nm resulting in strong fluorescence emission in the range 325 - 600 nm.
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Mikael Tiihonen, Valdas Pasiskevicius, Fredrik Laurell, Per Jonsson, Mikael Lindgren, "A compact OPO/SFG laser for ultraviolet biological sensing", Proc. SPIE 5332, Solid State Lasers XIII: Technology and Devices, (8 July 2004); doi: 10.1117/12.530292; https://doi.org/10.1117/12.530292

Optical parametric oscillators

Ultraviolet radiation


Nd:YAG lasers


Laser crystals

Second-harmonic generation

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