In-Band Pumped Thulium-Doped Tellurite Glass Microsphere Laser

Abstract

Microresonator-based lasers in the two-micron range are interesting for extensive applications. Tm3+ ions provide high gain; therefore, they are promising for laser generation in the two-micron range in various matrices. We developed a simple theoretical model to describe Tm-doped glass microlasers generating in the 1.9–2 μm range with in-band pump at 1.55 μm. Using this model, we calculated threshold pump powers, laser generation wavelengths and slope efficiencies for different parameters of Tm-doped tellurite glass microspheres such as diameters, Q-factors, and thulium ion concentration. In addition, we produced a 320-μm tellurite glass microsphere doped with thulium ions with a concentration of 5·1019 cm−3. We attained lasing at 1.9 μm experimentally in the produced sample with a Q-factor of 106 pumped by a C-band narrow line laser.

Cascade Brillouin Lasing in a Tellurite-Glass Microsphere Resonator with Whispering Gallery Modes

“…For our sample, 20% of the measured resonances had loaded Q-factors Q ≥ 2.5 × 10 7 and 60% of resonances had loaded Q-factors Q ≥ 1 × 10 7 . The use of a specially synthesized high-quality ultra-dry glass (64.5TeO 2 -21.5WO 3 -10La 2 O 3 -4Bi 2 O 3 ) and the fabrication of microspheres employing a CO 2 laser instead of a microheater allowed us to increase the Q-factors by an order of magnitude compared to our earlier results [45]. In the produced microresonator, cascade Stokes-Brillouin generation up to the 4th order inclusive was attained.…”

“…The experiments with the considered microsphere were carried out according to the scheme shown in Figure 5. Like in our previous works [44,45,52,53], the study was conducted in an acrylic glove box to minimize the influence of dust, air currents, and other external factors. The WGM microsphere was excited by a tunable CW narrow-band telecom laser (Pure Photonics, 18 dBm, 10 kHz linewidth, and 190.3-197.9 THz tuning spectral range) controlled by a computer.…”

“…In our earlier studies we fabricated tellurite microspheres from single-index fibe using a microheater [44,45]. In this work, we used a CO2 laser (Coherent Diamon The sample length L = 6 cm allowed us to process the 3 µm absorption band and calculate the OH volume-absorption coefficient and OH concentration.…”

“…In our earlier studies we fabricated tellurite microspheres from single-index fibers using a microheater [44,45]. In this work, we used a CO 2 laser (Coherent Diamond C-40A), which allowed us to improve the quality of the samples and achieve record loaded Q-factors for tellurite microspheres (≥2.5 × 10 7 ).…”

Формирование Неклассических Многофотонных Состояний Света Со Сжатыми Квантовыми Флуктуациями В Волокнах Из Модифицированного Висмутом Теллуритного Стекла

“…Также показана возможность применения многосердцевинных теллуритных волокон с управляемой дисперсией [26] для широкополосного преобразования ультракоротких импульсов со специальным пространственным распределением фазы [27]. Активные элементы на основе теллуритных световодов, легированных редкоземельными ионами, имеют огром-ные перспективы для генерации лазерного излучения с управляемыми параметрами [28][29][30][31][32][33]. Возможности применения теллуритных волокон для реализации квантовых эффектов ранее практически не исследовались.…”