Diode-pumped Pr:YAP lasers

Abstract

Spectroscopic properties and laser output results of Pr-doped YAlO3 material under 1-W GaN-laser-diode pumping at various resonator arrangement (linear, V-folded, and microchip configuration) are reviewed and compared. Continuous output power of up to 140 mW in the near-infrared spectral range at 747 nm wavelength as well as 45% slope efficiency (with respect to absorbed pump power) and intracavity frequency doubling resulting in 12.3 mW blue emission is reported. M2 NC LC M1 M3 FResonator arrangement: F -focusing lens, M1 -pump mirror, M2 -output folded mirror, M3 -end mirror, LC -laser crystal, and NC -nonlinear crystal

Out of the blue: semiconductor laser pumped visible rare‐earth doped lasers

“…9) [14]. Meanwhile, efficient diode pumped laser operation was also demonstrated in oxide materials such as Pr 3+ :YAlO 3 [29,95] (See Fig. 10) and Pr 3+ :SrAl 12 O 19 [16].…”

Pr:YAlO_3 laser generation in the green spectral range

“…We suppose that the back propagating pump radiation reflected from the microchip output side is fully absorbed and it fully contributed to the laser generation. This assumption is quite reasonable because, based on our former Pr ∶YAlO 3 experiments [7] with the same Pr doping level, the maximum pump power absorbed in a single pass was determined to be 90%. The spectral linewidth (FWHM) at 547 nm, measured by StellarNet fiber spectrometer (BLACK-Comet C-50), was determined to be 2 nm.…”

“…Alternatives to the fluoride crystals, in terms of efficient laser operation, include low-phonon oxygencontaining laser compounds, such as perovskite-type oxides that span the visible range (e.g., Pr ∶YAlO 3 [7,8]phonon energy of Pr ∶YAlO 3 is ≈550 cm −1 [6]-and the recently investigated Pr, Mg∶SrAl 12 O 19 [9,10]), which yield benefits from the excellent hardness (8.5-9 on the Mohs scale) and satisfactory thermal conductivity (not worse than 11 Wm −1 K −1 at 300 K) [6]. The requirement of a low-phonon laser host for Pr 3 ions is important due to suppression of non-radiative multi-phonon relaxation probability of the relatively small energy gap (≈3500 cm −1 ) between the upper 3 P 0 laser level and the adjacent 1 D 2 level [9]; this is also the reason why no Pr laser emission has ever been observed at room temperature in one of the most widely used laser hosts, Y 3 Al 5 O 12 [11].…”

“…It should be also mentioned that the Pr ∶YAlO 3 microchip crystal used was originally designed for laser operation in the green spectral range at 533 nm wavelength on the basis of our former room temperature emission spectrum measurements [7]. All these measurements were carried out before evaluating the cryogenic temperature spectra (533 nm emission line disappears at cryo-temperature, see Fig.…”

Cryogenically cooled Pr:YAlO3laser operating at 747 nm, 662 nm, and 622 nm wavelengths

“…1). 14,15 In addition, by a single-step intracavity second harmonic generation from the fundamental 747 nm wavelength, violet laser emission can be easily reached. 16 x x x ?ï ?i' In this contribution, temperature dependence on Pr:YAlO 3 laser input-output properties down to the cryogenic temperature have been investigated.…”