Dispersions of absorption coefficient μa, complex refractive index n, complex permittivity e and penetration depth δ of CdSe quantum dots were experimentally obtained in terahertz frequency range of 0.1-1 THz. The possibility of optical properties control by quantum dots sizes and temperature treatment was shown.
Glass doped with PbS quantum dots is presented as a saturable absorber for passive Q-switching of diode-pumped
Tm:KYW laser. Output pulses with energy of 43 μJ at the repetition rate of 2.5 kHz were obtained. The slope efficiency
with respect to the absorbed pump power was ~20%. Being compared in the same laser, PbS-doped glass saturable
absorber outperforms Cr:ZnSe one in output power, pulse energy and slope efficiency.
New saturable absorber Q-switch for 1.54 %mum Er: glass laser is present. The saturable absorber is transparent glass ceramic containing magnesium-aluminum spinel nanocrystallites doped with tetrahedrally coordinated Co2+ ions. Q-switched pulses of up to 5.5 mJ in energy and 80 ns in duration at 1.54 micrometers were achieved. Relaxation time of the 4A2 to 4T1(4F) transition bleaching was measured to be (450+/- 150)ns. Ground-state absorption cross-sections at 1.54 micrometers wavelength were estimated to be (3.2+/- 0.4)*10-19 cm2 and (5.0+/- 0.6)X10-20 cm2, respectively. Results of study absorption and luminescence spectra of different glass ceramics on the base of magnesium-aluminum, zinc-aluminum, lithium-aluminum spinel nanocrystallites doped with tetrahedrally coordinated Co2+ ions are also analyzed.
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