We investigated the ~2 μm spectroscopic and lasing performance of Tm(3+) Tm(3+)-Ho(3+) co-doped tungsten tellurite glass single mode fibers with a commercial 800 nm laser diode. The double cladding (SM) were fabricated by using rod-in-tube method. propagation loss fiber was ~2.5 dB/m at 1310 nm. properties analyzed. A 494 mW operating ~1.9 achieved in doped 20 cm long fiber, slope efficiency 26%, beam quality factor M(2) 1.09. 35 ~2.1 output also demonstrated 7 SM fiber.

The 2 μm emission spectra and lifetimes of Ho3+ ions in germanate glasses with different doping concentrations were investigated. Judd-Ofelt parameters, radiative transition rates, cross-section calculated based on the absorption spectra. energy transfer rate to hydroxyl groups non-radiative 5I7 level by fitting variations vs. concentrations. Besides, unclad fibers highly doped (6 × 1020 cm−3) fabricated pumped using a homemade 1.94 fiber laser, peak showed redshift increasing length.

Supercontinuum covering the ultraviolet-blue region is highly useful for fluorescence microscopy. Four zero-dispersion wavelength decreasing photonic crystal fibers with different fiber cross structures and taper profiles are fabricated to extend short edge of supercontinuum. Both nanosecond picosecond pump pulses at 1 μm used generate With a 3 ns pulse, supercontinuum extended below 400 nm in high air-hole ratio (named T3). The underlying mechanism generation explored. long edges related...

We reported the ~2 μm amplified spontaneous emission (ASE) performance of highly Tm 3+ -doped (3.76 × 10 20 ions/cm 3 ) tungsten tellurite single-mode fibers.The double-cladding fiber was pumped by a commercial 792 nm laser diode without any reflectors.Broadband ASE spectra with bandwidth (FWHM) varying from ~45 to ~140 were achieved in length 34 cm.The maximum output power ~34 mW, slope efficiency 4.8%.The beam quality factor (M 2 1.8.The dependence power, mean wavelength, and on launched...

A heavily Ho3+-doped lead silicate glass with low content of hydroxyls was prepared in this paper. Luminescent properties were characterized. Peak emission cross section reached 3.07 × 10−21 cm2 around 2055 nm and lifetime Ho3+: 5I7 fitted to be 1.31 ms. single-cald fiber using as the core. An all-fiber configuration constructed. Under in-band core-pump a silica laser, single-mode maximum 60 mW realized 6 cm-long fiber, which shows high potential for single-frequency lasers applications.

Tm3+-doped 0.1Tm2O3-1Al2O3-98.9SiO2 (mol%) silica glass with good uniformity was prepared by sol-gel method combining high temperature sintering. The core sized Φ3.2 × 50 mm Δn of 5 10−4 obtained after gelation, heat treatment, melting and polishing. Its spectroscopic properties were evaluated according to the detected absorption fluorescence spectra. maximum emission cross-section Tm3+ ion in this is 6.2 10−21 cm2 tested lifetime 836 μs at 1806 nm. Large double cladding fiber NA 0.102...

A highly Ho-doped single-mode lead germanate glass fiber is developed for compact ∼2 μm lasers. Over 600 mW of laser output operating at 2.04 demonstrated in a 2 cm-long active fiber. The slope efficiency reaches ∼34.9% with respect to the launched 1.94 pump power. To best our knowledge, this highest power within few centimeters This result shows that promising high-power single-frequency applications.

In this paper, we report a passively Q-switched and mode-locked ytterbium fiber laser employing Bi2S3 nanowire as saturable absorber (SA). The Q-switching mode-locking can be achieved in the same cavity at pump power through carefully rotating intra-cavity polarization controller. experiment, maximum output pulse energy is 157.2 nJ with repetition rate of 22.26 kHz 116.7 mW, while for passive mode-locking, train has 3.94 MHz, width 782 ps SNR ~49 dB. wavelength are both centered ~1038 nm, 3...

A highly Tm-doped lead germanate glass fiber is developed using the rod-in-tube method.The ∼2 μm laser beam quality of ∼1.5.The composite jumpers are homemade for all investigations.When core pumped by a 1590 nm Yb/Er laser, maximum output 313 mW achieved at 670 pump power, and corresponding slope efficiency ∼52.8%.Moreover, 2 cmlong as gain medium, 33 1942 Tm also demonstrated.

A tunable passively Q-switched fiber laser is fabricated using a graphene saturable absorber. The absorber composed of tapered coated with nanosheets. It combines the abilities and power-dependent filter, thereby simplifying structure laser. transmission peak linearly dependent on input power temperature, slopes approximately -0.35 nm/mW -3.63 nm/°C, respectively. exhibits wavelength range 7 nm (from 1558 to 1565 nm). output pulse offers shortest duration 2.22 μs repetition rate 39.1 kHz...

We demonstrate a passively mode-locked Tm-doped silica fiber laser with 535-MHz fundamental repetition rate by employing semiconductor saturable absorber mirror. With in-band pumping at 1590 nm, the stable produces up to 50 mW an incident pump power of 558 mW. The operating 1938 nm has spectral bandwidth 0.72 nm. After amplification, pulse width is measured be <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...

An all-fiber mode-locked fiber laser was achieved with a saturable absorber based on tapered deposited layered molybdenum selenide (MoSe2). The operated at central wavelength of 1558.35 nm an output spectral width 2.9 nm, and pulse repetition rate 16.33 MHz. To the best our knowledge, this is first report lasers using MoSe2 absorbers fibers.

We report all-fiber passively Q-switched Tm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup> -doped tellurite fiber lasers. The composite is specially designed to improve the mechanical strength. Both carbon nanotubes (CNTs) and semiconductor saturable absorber mirror (SESAM) are inserted separately into laser cavities as SAs demonstrate a fiber-integrated setup. In short, 9-cm fiber, 1.86- <inline-formula...

We report multicolor upconversion emissions including the blue-violet, green, and red lights in a Tm 3+/Er3+codoped tellurite glass photonic microwire between two silica fiber tapers. A is tapered until its evanescent field exposed then angled-cleaved at center to divide fibers into parts. melted by gas flame cluster sphere tip of one fiber. The other blended glass. When melted, tapers are simultaneously moving outwards draw between. advantage angled-cleaving on avoid cavity resonances high...

A single-mode laser output of 0.75 W near 2 μm was obtained with a slope efficiency 28.7% respect to the absorbed pump power when self-developed double-cladding Tm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup> -doped tellurium germanate glass fiber pumped using 793-nm diode laser. The core possesses an infrared cutoff edge reaching ~5 μm. calculated peak emission cross section at 1.9 6.8 × 10...

Abstract CsPbBr 3 nanocrystal is used as the saturable absorber (SA) for mode-locking Tm-doped fiber laser in a ring cavity. The modulation depth, intensity, and non-saturable loss of fabricated SA are 14.1%, 2.5 MW/cm 2 , 5.9%, respectively. In operation, mode-locked pulse train has repetition rate 16.6 MHz with width 24.2 ps. wavelength centered at 1992.9 nm 3-dB spectrum nm. maximum output power 110 mW slope efficiency 7.1%. Our experiment shows that can be an efficient 2- <mml:math...

In this study, we designed and fabricated a Tm3+-doped germanate glass fiber by using rod-in-tube technique. The has core diameter of ~13.5 μm with cladding 125 μm. Tm3+ doping concentration reached ~13 500 ppm, the propagation loss was less than 0.03 dB cm − 1 at 1310 nm. Pumping 1590 nm laser constructed in-house, 44.7 mW continuous-wave 1940 achieved in 22 cm-long fiber, slope efficiency 26%. passively Q-switched pulse output first demonstrated carbon nanotube saturable absorber fiber....