Comparative study of high power Tm:YLF and Tm:LLF slab lasers in continuous wave regime

Antoine Berrou, Oliver J. P. Collett, Daniel Morris, M. J. Daniel Esser

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Abstract

We report on Tm:YLF and Tm:LLF slab lasers (1.5 x 11 x 20 mm3) end pumped from one end with a high-brightness 792 nm laser diode stack. These two lasers are compared under identical pump conditions in continuous-wave regime. A stronger negative thermal lens in Tm:LLF than in Tm:YLF is highlighted, making it more difficult to operate the Tm:LLF laser under stable lasing conditions. In a configuration where the high reflectivity cavity mirror has a radius of curvature of r = 150 mm, the Tm:YLF (Tm:LLF) laser produces a maximum output power of 150 W (143 W) for 428 W of incident pump power (respectively). For a second cavity configuration where the high reflectivity cavity mirror has a radius of curvature of r = 500 mm, the Tm:YLF laser produces a maximum output power of 164 W for 412 W of incident pump power and a 57% slope efficiency with respect to the absorbed pump power. The emitted wavelength of these two lasers are measured as a function of the output coupler reflectivity and it shows that Tm:LLF laser emits at a longer wavelength than Tm:YLF.
Original languageEnglish
Pages (from-to)10559-10572
Number of pages14
JournalOptics Express
Volume26
Issue number8
Early online date11 Apr 2018
DOIs
Publication statusPublished - 16 Apr 2018

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