522/261 nm cw generation of Pr:YLF laser pumped by OPS laser

InGaN-LD-Pumped <inline-formula> <tex-math notation="TeX">${\rm Pr}^{3+}$</tex-math></inline-formula>: <inline-formula> <tex-math notation="TeX">${\rm LiYF}_{4}$</tex-math></inline-formula> Continuous-Wave Laser at 915 nm

“…Based on these experimental results, a power scaling of the Pr 3þ :LiYF 4 laser at 915 nm can be expected by optimizing the parameters of the laser configuration and/or utilizing a more powerful pumping source, such as a 1.6 W InGaN blue LD (Nichia Corporation: NDB7875) or a 5.3 W Coherent High Power OPS laser [11]. With a promoted output power, further works should be readily carried out, such as intra-or extra-cavity second-harmonic generation by using the adequate nonlinear crystal, Q-switched or mode-locked laser operation with the aid of various saturable absorbers and acousto-optic modulators, which is now already planned in our groups.…”

“…In the past decade, the fluoride crystals doped with trivalent Praseodymium ions, i.e., Pr 3þ : LiYF 4 , have drawn great attentions of researchers owing to the capability of lasing in several visible regions by directly transitions [1]- [11]. Correspondingly, three kinds of pumping source are developed according to the three peak absorptions, i.e., InGaN LDs at $444 nm [3]- [8], DPSSLs at $469 nm [9], [10], and OPSLs at $479 nm [12].…”

522 nm single-longitudinal-mode high-frequency Pr3+:YLF laser based on pre-lase Q-switching technology

“…By contrast, Pr 3+ :YLF has attracted much attention because of its ability to directly generate lasers at visible wavelengths (522 nm, 604 nm, 607 nm, 639 nm, and 720 nm) [18][19][20][21][22]. Pr 3+ :YLF visible light laser is not limited by the nonlinear crystal and avoids the problems of the high sensitivity of phase matching [23], space deviation [24], thermal lens effect of nonlinear crystal [25], and laser-induced damage [26].…”

Intracavity second-harmonic generation at 320 nm of an actively Q-switched Pr:LiYF4 laser

“…Another advantage of these visible lasers is that we can easily generate coherent ultraviolet (UV) light by intracavity frequency doubling. Continuous-wave (cw) UV radiation at 320 and 261 nm has already been demonstrated by intracavity secondharmonic generation (SHG) of Pr : LiYF 4 lasers oper-ating at 640 and 522 nm, respectively [7][8][9], using high-power optically pumped semiconductor lasers as a pumping source. Very recently, Gün et al reported an output power of 481 mW at 261 nm from an intracavity SHG of a Pr : LiYF 4 laser, using two InGaN laser diodes with a maximum output power of ∼1 W each [10].…”