Growth, thermal and laser properties of a new self-frequency-doubling Yb:CNGS crystal

Abstract

A new optical single-crystal Yb:CNGS (Yb:Ca 3 NbGa 3 Si 2 O 14 ) was grown successfully for self-frequencydoubling with the sizes of 25 mm in diameter and 50 mm in length using the Czochralski methods. We studied the thermal properties of these crystals systematically, including the thermal expansion coefficient, specific heat, thermal diffusion coefficient, and the thermal conductivity. The absorption and fluorescence spectra of Yb:CNGS crystal were measured. The absorption spectra show a broad transmission range from 350 to 3500 nm. The continuous-wave (CW) laser output at 1060 nm was demonstrated with aand c-cut crystal. The maximum output power was about 1.53 W under a 4.03 W incident power with z-cut crystals.The slope efficiency was as high as 47.8%. An efficient CW self-frequency-doubling (SFD) green laser was performed with a diode-pumped Yb:CNGS laser. The CW green output power was 37.1 mW and the wavelength tunability from 526 to 532 nm with input pump power as been demonstrated.

Spectroscopic characterization of SrB4O7:Tm2+, a potential laser material and optical temperature sensor

“…Accordingly, the line located at 1131.6 nm is related to the transition ending on the lowest crystal eld component of the ground multiplet (0-0 line) and remaining lines are related to transitions ending on the higher crystal eld components located at 75, 164 and 362 cm À1 . In the spectrum of the 50 K luminescence an additional line related to transition from the second higher energy component of the initial 2 is found to be long-lived. Decay curves of this luminescence were recorded at different temperatures in the 5-450 K region.…”

“…1 The search for new laser active crystals is continuing and is directed mainly toward nding better and cheaper laser hosts. [2][3][4] Crystals doped with divalent rare earth ions have been studied, too. Interest in these systems resulted from an expectation that owing to low energies of the 4f NÀ1 5d excited congurations the broad and intense absorption bands related to parity allowed inter-congurational transitions in divalent rare earth ions would be benecial for optical pumping.…”

Self-frequency-doubling Yb:CNGS lasers operating in the femtosecond regime

“…Spatially plane waves were assumed in the model with the spatial walk-off (~1.6°) neglected. While the SFD properties of Yb:CNGS have been investigated previously [24], the value of the nonlinear coefficient d 11 was not measured. Here, for the purpose of visualization, we used a value determined for a similar isostructural compound, Ca 3 TaGa 3 Si 2 O 14 (CTGS), which amounts to 0.72 pm/V [38].…”

“…Recently, a novel SFD gain medium, Yb:CNGS (Ca 3 NbGa 3 Si 2 O 14 ; calcium niobium gallium silicate) has been demonstrated [24]. Yb:CNGS is a langasite-type optically uniaxial (positive) crystal, which belongs to the same trigonal class 32 as YAB and LGSB [25,26], although it shows different structure (space group P321).…”

Growth, Thermal, and Spectroscopic Properties of YbBa3(PO4)3 Single Crystal: A New Stoichiometric Lasing Material

“…With the fast development of high-performance diode-pumped solid-state lasers with emissions centered at wavelengths near 1000 nm, significant interests have been followed with ytterbium-doped laser materials, which can be used as efficient pump sources for Yb 3+ ions. − Compared with neodymium lasers, ytterbium lasers have distinct merits such as a lack of excited-state absorption, luminescence quenching, and up-conversation and negligible nonradiative decay between the only two states in its simple electronic structure, the 2 F 7/2 ground state and the 2 F 5/2 excited state. − Furthermore, the broad absorption and emission bands allow for easy diode pumping, near-infrared tunability, and the generation of ultrashort pulses . Considering these features, Yb 3+ ion is a promising option for lasing in the near-infrared region and can also be used to sensitize other ions such as rare earth and transition metal ions. − More significantly, Yb laser crystals are highly suitable for microchip laser (or thin disk) applications.…”