Energy transfer in Tm,Ho:KYW crystal and diode-pumped microchip laser operation

© 2016 Optical Society of America.An investigation of Tm-Ho energy transfer in Tm(5at.%),Ho(0.4at.%):KYW single crystal by two independent techiques was performed. Based on fluorescence dynamics measurements, energy transfer parameters P71 and P28 for direct (Tm→Ho) and back (Ho→Tm) transfers, respectively, as well as equilibrium constant Θ were evaluated. The obtained results were supported by calculation of microscopic interaction parameters according to the Förster-Dexter theory for a dipoledipole interaction. Diode-pumped continuous-wave operation of Tm,Ho:KYW microchip laser was demonstrated, for the first time to our knowledge. Maximum output power of 77 mW at 2070 nm was achieved at the fundamental TEM00 mode

Energy transfer in Tm,Ho:KYW crystal and diode-pumped microchip laser operation

© 2016 Optical Society of America.An investigation of Tm-Ho energy transfer in Tm(5at.%),Ho(0.4at.%):KYW single crystal by two independent techiques was performed. Based on fluorescence dynamics measurements, energy transfer parameters P71 and P28 for direct (Tm→Ho) and back (Ho→Tm) transfers, respectively, as well as equilibrium constant Θ were evaluated. The obtained results were supported by calculation of microscopic interaction parameters according to the Förster-Dexter theory for a dipoledipole interaction. Diode-pumped continuous-wave operation of Tm,Ho:KYW microchip laser was demonstrated, for the first time to our knowledge. Maximum output power of 77 mW at 2070 nm was achieved at the fundamental TEM00 mode

Energy transfer in Tm,Ho:KYW crystal and diode-pumped microchip laser operation

An investigation of Tm-Ho energy transfer in Tm(5at.%), Ho(0.4at.%):KYW single crystal by two independent techiques was performed. Based on fluorescence dynamics measurements, energy transfer parameters P71 and P28 for direct (Tm→Ho) and back (Ho→Tm) transfers, respectively, as well as equilibrium constant Θ were evaluated. The obtained results were supported by calculation of microscopic interaction parameters according to the Förster-Dexter theory for a dipoledipole interaction. Diode-pumped continuous-wave operation of Tm,Ho:KYW microchip laser was demonstrated, for the first time to our knowledge. Maximum output power of 77 mW at 2070 nm was achieved at the fundamental TEM00 mode

ПРИМЕНЕНИЕ МЕТОДОВ ФЮХТБАУЭРА–ЛАДЕНБУРГА И СООТВЕТСТВИЯ ДЛЯ ОПРЕДЕЛЕНИЯ СПЕКТРОВ СЕЧЕНИЙ СТИМУЛИРОВАННОГО ИСПУСКАНИЯ НЕОДИМОВЫХ ЛАЗЕРНЫХ СРЕД

Rare-earth doped crystals with broad bands of gain spectra are attractive for femtosecond laser applications. Therefore, for this purposes crystals with disordered structure are of great interest. In this article we investigate laser-related spectroscopic properties of new trigonal crystals Nd3+:Ca10K(VO4 )7 (Nd:CKV), Nd3+:Ca9 La(VO4 )7 (Nd:CLaV) и Nd3+:Ca10Li(VO4 )7 (Nd:CLiV). The Füchtbauer-Ladenburg equation and the integral reciprocity method were applied for determination of stimulated emission cross section spectra for Nd3+ ions. The maximum values of emission cross sections and bandwidth (FWHM) near λ = 1,07 μm are 9,33·10 -20cm2 (σ – polarization, Nd:CKV) and 30 nm (π – polarization, Nd:CKV), near λ = 1,35 μm – 1,55·1020cm2 and 50 nm (π – polarization, Nd:CKV). The broad and smooth bands of the gain spectra in the regions near 1,07 and 1,35 μm make it possible to generate ultra short light pulses with duration of about 60 fs (1,07 µm) and 45 fs (1,35  µm) in the mode-locking regime. Для создания лазеров, генерирующих импульсы ультракороткой длительности, представляют большой интерес лазерные материалы с широкими полосами усиления. В этой связи значительный интерес представляют структурно разупорядоченные материалы, в частности новые кристаллические среды, принадлежащие тригональной сингонии Nd3+:Ca10K(VO4 )7 (Nd:CKV), Nd3+:Ca9 La(VO4 )7 (Nd:CLaV) и Nd3+:Ca10Li(VO4 )7 (Nd:CLiV). В данной работе формула Фюхтбауэра-Ладенбурга и интегральный метод соответствия применены для определения спектров сечений стимулированного испускания указанных выше кристаллов на переходах 4 F3/2 → 4 I9/2, 4 F3/2 → 4 I11/2, и 4 F3/2 → 4 I13/2 иона неодима. Максимальные пиковые значения сечений стимулированного испускания и наибольшие спектральные ширины полос в области 1,07 мкм составляют 9,33·10-20 см2 (σ-поляризация, Nd:CKV) и 30 нм (π-поляризация,  Nd:CKV), в области 1,35 мкм – 1,55·10-20 см2 и 50 нм (π-поляризация, Nd:CKV). Полосы стимулированного испускания, а следовательно, и усиления в областях спектра 1,07 и 1,35 мкм являются гладкими и бесструктурными с ширинами, позволяющими получать ультракороткие импульсы света с длительностью  ≈  60 фс (1,07 мкм), ≈ 45 фс (1,35 мкм) в лазерах на исследованных лазерных средах, работающих в режиме синхронизации мод.

Energy transfer in Tm,Ho:KYW crystal and diode-pumped microchip laser operation

© 2016 Optical Society of America.An investigation of Tm-Ho energy transfer in Tm(5at.%),Ho(0.4at.%):KYW single crystal by two independent techiques was performed. Based on fluorescence dynamics measurements, energy transfer parameters P71 and P28 for direct (Tm→Ho) and back (Ho→Tm) transfers, respectively, as well as equilibrium constant Θ were evaluated. The obtained results were supported by calculation of microscopic interaction parameters according to the Förster-Dexter theory for a dipoledipole interaction. Diode-pumped continuous-wave operation of Tm,Ho:KYW microchip laser was demonstrated, for the first time to our knowledge. Maximum output power of 77 mW at 2070 nm was achieved at the fundamental TEM00 mode

Revue de l'Association canadienne des études asiatiques, septembre 1982

Some text in Frenc

Energy transfer parameters and microchip diode-pumped CW laser performance of Tm, Ho:KYW crystal

© OSA 2015. Energy transfer parameters of Tm(5at.%),Ho(0.4at.%):KYW single crystal were investigated. A diode-pumped CW Tm,Ho:KYW microchip laser was realized. Maximum output power of 77 mW at 2070 nm was achieved in the fundamental TEM00 mode

Energy transfer in Tm,Ho:KYW crystal and diode-pumped microchip laser operation

© 2016 Optical Society of America.An investigation of Tm-Ho energy transfer in Tm(5at.%),Ho(0.4at.%):KYW single crystal by two independent techiques was performed. Based on fluorescence dynamics measurements, energy transfer parameters P71 and P28 for direct (Tm→Ho) and back (Ho→Tm) transfers, respectively, as well as equilibrium constant Θ were evaluated. The obtained results were supported by calculation of microscopic interaction parameters according to the Förster-Dexter theory for a dipoledipole interaction. Diode-pumped continuous-wave operation of Tm,Ho:KYW microchip laser was demonstrated, for the first time to our knowledge. Maximum output power of 77 mW at 2070 nm was achieved at the fundamental TEM00 mode

Temperature dependence of green upconversion fluorescence of fluorophosphate and tellurite-barium glasses for application in temperature sensors

Temperature dependences are studied of green upconversion fluorescence of the five erbium- and ytterbium-doped glasses (three fluorophosphate glasses, one of which is additionally doped with Tm, and two tellurite-baruim ones) in the temperature range from 30°C to 150°C. The ratio of intensities is determined of two fluorescence bands at about 515-525 nm and 540-560 nm versus the specimen temperature. The sensitivity of temperature measurement is found and a comparison of the glasses is performed according to this characteristic

Comparative study of spectroscopic properties of Pr³⁺-doped LiY<inf>0.3</inf>Lu<inf>0.7</inf>F<inf>4</inf>, LiYF<inf>4</inf> and LiLuF<inf>4</inf> crystals

© 2019 IEEE. Fluoride crystals are the most common host materials for visible lasers due to large energy band gap and low phonon energy. Among the rare-earth ions, the Pr3+ is very attractive ion for visible solid-state lasers. Efficient laser operation in Pr-doped crystals was obtained around 480 nm, 523 nm, 607 nm, 640 nm, 698 nm and 720 nm [1]. Mixed fluorides LiYxLux-1F4 crystals posses higher optical quality and require less expensive lutetium fluoride during growth in contrast to LiYF4 and LiLuF4, respectively. Moreover, in the case of Ce3+ and Nd3+ ions, the mixed fluorides have higher segregation coefficient comparing to both LiYF4 and LiLuF4 crystals [2, 3]. The optimal cationic composition is x = 0.6-0.7