A high power diode-side-pumped Nd:YAG/BaWO₄Raman laser at 1103 nm

Abstract

Pulsed operation at 1103 nm of a diode-side-pumped Nd:YAG laser with intracavity Raman shifting in BaWO4 is reported. The first Stokes wavelength at 1103 nm was generated by a Raman shift of 332 cm−1 from the fundamental wave (1064 nm). A maximum power at 1103 nm of 9.4 W was obtained for a diode pump power of 115 W at a pulse repetition rate of 15 kHz. The pump-to-Stokes conversion efficiency was up to 8.2%. When the output power at 1103 nm was over 7 W, a second Stokes line at 1145 nm was also observed in the experiment. Our research indicates that efficient Raman conversion can be realized by a Raman frequency shift at 332 cm−1 in BaWO4 Raman lasers.

Stimulated Raman Scattering in Alkali-Earth Tungstate and Molybdate Crystals at Both Stretching and Bending Raman Modes under Synchronous Picosecond Pumping with Multiple Pulse Shortening Down to 1 ps

“…The shortest pulse durations of 1.46 ps and 1.41 ps for the SrMoO 4 and SrWO 4 lasers, respectively, were close to the limit given by the inverse width of the widest ν 2 vibrational line (1/π c∆ν 2 = 1.0 ps and 1.2 ps for SrMoO 4 and SrWO 4 , respectively). This extreme pulse shortening can be explained by the theory of ultra-short SRS pulse formation at intracavity pumping [62] taking into account that generation of the highly shortened (ν 1 + ν 2 )-shifted or (ν 1 + 2ν 2 )-shifted SRS pulses in our extracavity Raman lasers were intracavity pumped by the ν 1 -shifted or (ν 1 + ν 2 )-shifted SRS radiation.…”

Synthesis, Characterization, and Low Temperature Sintering of Nanostructured BaWO4for Optical and LTCC Applications

“…The reasons for blue and green PL emissions of BaWO 4 are discussed in many different aspects ranging from defect centers by interstitial oxygen atoms to structural disorder in the crystal lattice [8][9][10][11]. BaWO 4 also serves as a potential material for designing all solid-state lasers, especially that it has been considered as a unique Raman crystal for a wide variety of pump pulse durations in Raman laser pulses [12][13][14][15][16][17]. Its other applications include nuclear spin optical hole burning hosts [6], radiation detection [1], scintillating devices [4], and other electro-optic applications [1].…”

High-Pressure Low-Temperature Optical Studies of BaWO4:Ce,Na Crystals

“…Typically, excitation with short-wavelength UV light (210–280 nm) gives blue emission, while longer wavelengths (e.g., 325 nm) induce an additional green component, which is the object of our study. These phenomena are also discussed in many other papers such as those, for example, by Lou and Ma et al Since numerous origins of both PL types in BaWO 4 have been proposed, ranging from defect centers associated with interstitial oxygen atoms to specific structural disorder, additional crystal lattice studies have been carried out. − Some of them concern not only XRD but also lattice dynamics studied via Raman spectroscopy, since barium tungstate is a good, scattering-active crystal (Raman shifter), considered for pump pulse lasers in order to acquire stimulated Raman spectra. ,− …”