Highly efficient LD-pumped 607 nm high-power CW Pr3+: YLF lasers

Laser emission from low-loss cladding waveguides in Pr:YLF by femtosecond laser helical inscription

“…Due to the relatively high propagation loss, a higher laser threshold of 161.6 mW is observed from WG5, and the maximum output power (81 mW) and the slope efficiency (11.8%) are lower. Compared with the previous work on Pr:YLF bulky lasers, our waveguide laser systems, although they do not have as high of a performance, show prominent merits in terms of highly compact lasing oscillation cavity and low threshold pump power of 604 nm radiation [20,21,23] . Further comparison with the previously demonstrated Pr:YLF cladding waveguide lasers shows that the ones produced here are more advantageous as integrated laser devices for reduced pumping thresholds and enhanced efficiencies [11,25] .…”

“…Waveguide laser emission at 607 nm has not been obtained. It has been found that the actual emission cross section (after excluding the influence of reabsorption) at 604 nm (19.6 × 10 −20 cm 2 ) is slightly higher than that at 607 nm (15.7 × 10 −20 cm 2 ) at room temperature [23] . This, in company with the relatively low pumping laser powers used for waveguide laser generation, might be possible reasons responsible for the prior laser operation at 604 nm in the waveguide structures.…”

“…The most established host material for Pr 3 ions is LiYF 4 (YLF). Based on the bulk Pr:YLF, orange laser emissions pumped by a blue semiconductor laser diode (LD) have been demonstrated [20][21][22][23] . In spite of this fact, there are only a few research works related to waveguide structures in Pr:YLF up to now.…”

Diode-pumped high-power continuous-wave intracavity frequency-doubled Pr3+:YLF ultraviolet lasers around 349 nm

“…As is well known, the Pr 3+ :YLF crystal has been proved to exhibit excellent laser performance in the visible region [ 18 – 27 ] . Thanks to the development of the blue laser diode (LD), it is easier to realize more compact high-power LD-pumped Pr 3+ :YLF lasers [ 28 , 29 ] . Due to the outstanding visible laser performance, it is natural that people start to build more compact UV laser sources based on the Pr 3+ :YLF crystal through SHG [ 30 – 36 ] .…”

Influence of Na+, Ca2+ and R3+ (R = Y, Lu, Gd) co-doping on the spectroscopic properties of Pr3+:BaF2 single crystal

“…In general, Pr 3+ ions embrace the abundant energy level structure, which is regarded as potential activating ions in various gain materials for visible laser. 6 With the development of blue laser diodes (LDs) and frequency-doubled optically pumped semiconductor laser (2ω-OPLS), high efficiency laser output has been achieved in Pr 3+ ions-doped crystals, such as LiYF 4 (YLF), 7,8 BaY 2 F 8 (BYF), 9 KY 3 F 10 (KYF), 10 LiY 0.3 Lu 0.7 F 4 (LY 0.3 L 0.7 -LF), 11 CaF 2 12 and SrF 2 . 13 In addition, in oxide matrixes, e.g., SrAl 12 O 19 (SRA), 14 YAlO 3 (YAP), 15 and LaMgAl 11 O 19 (LMA), 16 the laser output has also been also realized.…”