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• W184497859 abstract "We have, through careful analysis of spectroscopic data, designed and demonstrated a diode-end-pumped, quasicontinuous wave Tm:GdVO4 laser operating at 1892 nm in order to pump a Q-switched Ho:YLF laser. The Ho:YLF maximum output energy was 1.9 mJ in an 18 ns pulse, at a wavelength of 2050 nm. Type 1: Oral or Poster Q-switched Ho:YLF Laser Pumped by a Tm:GdVO4 Laser M. J. Daniel Esser,* H. Strauss, W. S. Koen, D. Preussler, K. Nyangaza and C. Bollig National Laser Centre, Council for Scientific and Industrial Research, PO Box 395, Pretoria, 0001, South Africa (*desser@csir.co.za) INTRODUCTION Orthovanadates are attractive host crystals for rare-earth doped diode-pumped solid-state lasers. This is also the case when doped with Tm or Ho, which have been shown to exhibit certain advantages over other host crystals for Mid-IR lasers. In particular, it has been shown that Tm:GdVO4 has strong and broad absorption features at the emission wavelength of commercially available high power laser diodes at ~800 nm. In addition, the broad emission peak at 1.9 μm in Tm:GdVO4 can be utilised for laser operation over a wide wavelength tuning range, including wavelengths which can be used to pump Ho and Cr:ZnSe lasers. The highest laser output power was reported by Li et al who achieved a maximum continuous-wave output power of 2.8 W from a diode-end-pumped Tm:GdVO4 laser. 4 In addition, with the use of an intra-cavity birefringence filter, they demonstrated a tuning range of 126 nm (1820 to 1946 nm). More recently, a comparative study of the tuning ranges of Tm:YVO4, Tm:LuVO4 and Tm:GdVO4 was conducted by Sulc et al, both in continuous wave (CW) and quasi-continuous wave (QCW) mode. Also, we have previously demonstrated a diode-end-pumped QCW Tm:GdVO4 laser operating at 1818 nm or at 1915 nm by appropriate selection of the resonator output coupling value. Thus, even though significant wavelength tuning has been demonstrated for Tm:GdVO4, to our knowledge, there has been no report of a Tm:GdVO4 laser pumping a Ho 3+ laser. In this paper we report on the design and operation of a diode-end-pumped QCW Tm:GdVO4 laser selected to lase at 1892 nm, which was used to pump a Qswitched Ho:YLF laser. SPECTRAL ANALYSIS To design a high-power diode-pumped Tm:GdVO4 laser for pumping a Ho:YLF laser, detailed spectroscopic studies of the laser materials are required. The absorption cross section data (σabs) of Ho:YLF for the I8 – I7 transition is shown in Figure 1. The absorption is highly polarised and it would be preferential to pump on either of the two absorption peaks of the π-polarisation (E||c), located at 1892 nm (0.72 x 10 cm), and at 1940 nm (0.99 x 10 cm). When pumped at either of these two wavelengths, the Ho:YLF laser can emit at 2.05 μm, (on π-polarisation) or at 2.06 μm when forced to lase on the weaker σ-polarisation (E⊥c). 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1." @default.
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• W184497859 date "2009-06-01" @default.
• W184497859 modified "2023-09-27" @default.
• W184497859 title "Q-switched Ho:YLF laser pumped by a Tm:GdVO4 laser." @default.
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