Translator Disclaimer
14 February 2008 Solid state saturable absorbers for Q-switching at 1 and 1.3μm: investigation and modeling
Author Affiliations +
Abstract
Yttrium and Lutecium garnets (YAG and LuAG) doped by Chromium or Vanadium ions (Cr4+ or V3+) were investigated as saturable absorbers potentially useful for passive Q-switching at wavelengths 1 μm and/or 1.3 μm. For comparison also color center saturable absorber LiF:F-2 and Cobalt doped spinel (Co:MALO) were studied. Firstly, low power absorption spectra were recorded for all samples. Next, absorbers transmission in dependence on incident energy/power density was measured using the z-scan method. Crystals Cr:YAG, Cr:LuAG, V:YAG, and LiF:F-2 were tested at wavelength 1064 nm. Therefore Alexandrite laser pumped Q-switched Nd:YAG laser was used as a radiation source (pulse length 6.9 ns, energy up to 1.5 mJ). Crystals V:YAG, V:LuAG, and Co:MALO were tested at wavelength 1338 nm. So diode pumped Nd:YAG/V:YAG microchip laser was used as a radiation source (pulse length 6.2 ns, energy up to 0.1 mJ). Using measured data fitting, and by their comparison with numerical model of a "thick" saturable absorber transmission for Q-switched Gaussian laser beam, following parameters were estimated: saturable absorber initial transmission T0, saturation energy density ws, ground state absorption cross-section σGSA, saturated absorber transmission Ts, excited state absorption cross-section σESA, ratio γ = σGSAESA, and absorbing ions density. For V:YAG crystal, a polarization dependence of Ts was also investigated. With the help of rate equation numerical solution, an impact of saturable absorber parameters on generated Q-switched pulse properties was studied in plane wave approximation. Selected saturable absorbers were also investigated as a Q-switch and results were compared with the model.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jan Šulc D.D.S., Pavel Arátor, Helena Jelínková, Karel Nejezchleb, Václav Škoda, and Milan R. Kokta "Solid state saturable absorbers for Q-switching at 1 and 1.3μm: investigation and modeling", Proc. SPIE 6871, Solid State Lasers XVII: Technology and Devices, 68712D (14 February 2008); https://doi.org/10.1117/12.760946
PROCEEDINGS
11 PAGES


SHARE
Advertisement
Advertisement
RELATED CONTENT

Single crystals for laser technique
Proceedings of SPIE (October 24 2002)
Nd YAG V YAG microchip laser generating 1 ns long...
Proceedings of SPIE (May 19 2010)
High power diode pumped passively Q switched Nd S VAP...
Proceedings of SPIE (October 28 2001)
Passively Q switched Nd S VAP laser with a Cr4+...
Proceedings of SPIE (April 02 2000)

Back to Top