Efficient cryogenic orange Pr:YLF lasers.

We present experimental evidence that the efficiency of orange Pr lasers is limited by losses due to ground state absorption. To this end, we determined the temperature-dependent orange reabsorption and performed laser experiments with orange Pr:YLF lasers at 604 nm and 607 nm in the temperature range between 78 K and 295 K. At 110 K, a slope efficiency of 67% and an optical-to-optical efficiency of 64% are obtained.

UV-laser-diode-pumped visible TbLiLuF lasers.

We investigate the dependence of the visible laser performance of Tb:LiLuF (Tb:LLF) on the ultraviolet (UV) pumping wavelength and present the first, to the best of our knowledge, UV-laser-diode-pumped Tb-based laser. We find an onset of thermal effects already at moderate pump power for UV pump wavelengths with strong excited-state absorption (ESA), which vanishes at pump wavelengths with weak ESA. Pumping with a UV laser diode emitting at 378.

Laser performance of high optical quality 4 at.% Pr: SrLaMgAlO (Pr:ASL) single crystals.

In this work, we present the visible laser performance of improved optical quality Czochralski-grown 4 at.% Pr-doped SrLaMgAlO (Pr:ASL) single crystals in the deep red (726 nm), the red (645 nm) and the orange (620 nm) range using two different pumping sources. Using a high beam quality frequency doubled Ti:sapphire laser with 1 W output power as pump source, deep red laser emission was reached at a wavelength of 726 nm with 40 mW of output power and a laser threshold of 86 mW.