Highly efficient high power CW and Q-switched Ho:YLF laser

• Autorzy: Kwiatkowski J.

Identyfikatory

DOI

10.1515/oere-2015-0018

• Języki publikacji: EN

Abstrakty

EN

An efficient operation of a Ho:YLF laser pumped by a Tm-doped fibre laser is reported. The research in a continuous-wave (CW) operation was done for two crystals of the same 0.5 at. % Ho dopant concentration and with different lengths (3×3×30 mm³ and 3×3×50 mm³). For an output coupling transmission of 20% and a crystal length of 50 mm, the maximum CW output power of 38.9 W for 81.4 W of incident pump power, corresponding to the slope efficiency of 52.3% and optical-to-optical conversion efficiency of 47.8% (determined with respect to the incident pump power) was achieved. The highest optical-to-optical conversion efficiency of 70.2% with respect to the absorbed pump power was obtained. The influence of a heat-sink cooling water temperature on the CW laser performance was studied. For a Q-switched operation the pulse repetition frequency (PRF) was changed from 2 to 10 kHz. The maximum average output power of 34.1 W at the PRF of 10 kHz was obtained for a 50 mm holmium crystal length. For 2 kHz PRF and 71.9 W of incident pump power, pulse energies of 13.7 mJ with a 21 ns FWHM pulse width corresponding to 652 kW peak power were recorded.

Słowa kluczowe

EN

mid-infrared lasers; Ho; YLF; solid-state lasers; 2-μm lasers; Q-switched lasers

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2015
• Tom: Vol. 23, No. 2
• Strony: 165--171
• Opis fizyczny: Bibliogr. 26 poz., wykr.

Twórcy

autor

Kwiatkowski J.

• Institute of Optoelectronics, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland

Bibliografia

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Uwagi

EN

This research has been supported by the National Science Centre of Poland under contract No. 2011/03/B/ST7/00256 and partially funded by the European Union from the European Regional Development Fund, project number: WND-POIG02.01.00-14-095/09.