Lasing at 2.72 µm in an Er-doped high-purity tungsten-tellurite glass fiber laser.

This Letter reports the experimental realization, for the first time to our knowledge, of lasing in an erbium-doped tellurite fiber at 2.72 µm. The key to the successful implementation was the use of advanced technology for obtaining ultra-dry preforms of tellurite glasses, as well as the creation of single-mode Er-doped tungsten-tellurite fibers with an almost imperceptible absorption band of hydroxyl groups, with a maximum of ∼3 µm.

Broadband gain performance in the mid-IR using supercontinuum: 2.7 µm gain in high-purity Erdoped tungsten tellurite glass fibers.

This paper presents an experimental study of broadband mid-IR amplification that is carried out, for the first time, to the best of our knowledge, in an erbium-doped tungsten tellurite fiber. A simple, robust supercontinuum source based on a tapered germanate fiber is developed as a seed input in the region of 1.5-3 µm.

Dual-band Tm-doped tellurite fiber amplifier and laser at 1.9 μm and 2.3 μm.

Ultrabroadband amplification and two-color CW lasing simultaneously near 1.9 μm and 2.3 μm in a Tm-doped tellurite fiber were demonstrated experimentally, for the first time to the best of our knowledge.

[Comparative analysis of parameters of corrected and uncorrected QT-interval dispersion of magneto-, electrocardiography and isomagnetic maps in patients with ischemic heart disease].

Aim: To compare possibilities of magnetocardiography (MCG) and electrocardiography for assessment of regional dispersion of ventricular recovery time using parameters of corrected and uncorrected QT-interval dispersion (DQTs and DQT).

Material: Twenty three patients with class II angina pectoris including 11 patients with history of myocardial infarction (MI) and 13 practically healthy subjects.

Results: Mean DQT and DQTc were significantly higher (p<0.