Efficient yellow Dy:ZBLAN fiber laser with high-brightness diode-pumping at 450 nm.

We report on a low-threshold efficient yellow Dy-fiber laser with good beam quality featuring high-brightness pumping. It employs a single-clad 0.2 mol% Dy:ZBLAN fiber pumped by two 450-nm blue GaN laser diodes.

Deep-red double-clad fiber laser at 717 nm.

We report on a double-clad fiber laser operating on the P → F Pr transition (in the deep-red spectral range) pumped by a GaN diode laser at ∼442 nm. It employs a 0.8-mol% PrF-doped ZBLAN double-clad fiber with a 7.

Tm and Ho colasing in in-band pumped waveguides fabricated by femtosecond laser writing.

We report on the first, to the best of our knowledge, in-band pumped , codoped waveguide (WG) laser. A depressed-index surface channel WG (type III) with a 50 µm half-ring cladding is fabricated in a 5 at. % , 0.

Watt-level visible laser in double-clad Pr-doped fluoride fiber pumped by a GaN diode.

We report on a red praseodymium fiber laser delivering 1.07 W at 634.5 nm with a slope efficiency of 20.

Channel waveguide lasers in bulk Tm:LiYF produced by deep diamond-saw dicing.

We report on a novel approach to fabricate channel (ridge) waveguides (WGs) in bulk crystals using precision diamond saw dicing. The channels feature a high depth-to-width aspect ratio (deep dicing). The proof-of-the-concept is shown for a Tm:LiYF fluoride crystal.

Watt-level diode-pumped thulium lasers around 2.3 µm.

We report on efficient diode-pumped mid-infrared lasers based on :, :, and : crystals. These lasers operate in the continuous-wave (CW) regime and deliver watt-level output power at the wavelengths of 2.2-2.

Low-loss fs-laser-written surface waveguide lasers at >2 µm in monoclinic Tm:MgWO.

Surface channel waveguides (WGs) based on a half-ring (40-60-µm-diameter) depressed-index cladding (type III) geometry are fabricated in monoclinic Tm:MgWO by femtosecond (fs) laser writing at a repetition rate of 1 kHz. The WGs are characterized by confocal laser microscopy and -Raman spectroscopy. A Tm:MgWO WG laser generates 320 mW at ∼2.

Laser operation of cleaved single-crystal plates and films of Tm:KY(MoO).

We report on the crystal growth, spectroscopy and first laser operation of a novel double molybdate compound - Tm:KY(MoO). This orthorhombic (sp. gr.

Ultrafast laser inscribed waveguide lasers in Tm:CALGO with depressed-index cladding.

Depressed-index buried and surface channel waveguides (type III) are produced in a bulk 3.5 at.% Tm:CALGO crystal by femtosecond direct-laser-writing at kHz repetition rate.

Ytterbium calcium fluoride waveguide laser.

Calcium fluoride is a well-known material for optical components. It is also suited for doping with rare-earth ions, e.g.

Fs-laser-written thulium waveguide lasers Q-switched by graphene and MoS.

We report the generation of mid-infrared (~2 µm) high repetition rate (MHz) sub-100 ns pulses in buried thulium-doped monoclinic double tungstate crystalline waveguide lasers using two-dimensional saturable absorber materials, graphene and MoS. The waveguide (propagation losses of ~1 dB/cm) was micro-fabricated by means of ultrafast femtosecond laser writing. In the continuous-wave regime, the waveguide laser generated 247 mW at 1849.

"Mixed" Tm:Ca(Gd,Lu)AlO - a novel crystal for tunable and mode-locked 2 µm lasers.

We report on the crystal growth, spectroscopy characterization and first laser operation of a new tetragonal disordered "mixed" calcium aluminate crystal, Tm:Ca(Gd,Lu)AlO. The introduction of Lu leads to an additional inhomogeneous broadening of Tm absorption and emission spectra compared to the well-known Tm:CaGdAlO. The maximum stimulated-emission cross-section for the F → H Tm transition is 0.

Femtosecond-laser-written Ho:KGd(WO) waveguide laser at 2.1 μm.

We report on efficient laser operation of the first holmium monoclinic double tungstate waveguide laser fabricated by femtosecond direct laser writing. A depressed-index buried channel waveguide with a 60 μm diameter circular cladding was inscribed in 5 at.% Ho:KGd(WO).

Diamond saw dicing of thulium channel waveguide lasers in monoclinic crystalline films.

A surface channel waveguide (WG) laser is produced by diamond saw dicing of a 15 μm thick 10 at. % Tm:KYGdLu(WO) monoclinic double tungstate thin film grown by liquid phase epitaxy on an undoped KY(WO) substrate. The WG propagation losses are 1.

Comparative study of Yb:KYW planar waveguide lasers Q-switched by direct- and evanescent-field interaction with carbon nanotubes.

Both direct- and evanescent-field interactions with carbon nanotubes (CNTs) are applied to achieve stable Q-switched operation of Yb:KYW planar waveguide lasers. The performance characteristics were investigated in a same cavity configuration and analyzed in detail in the following three cases, CNTs deposited onto end mirror (M-coating), output coupler (OC-coating) and top surface of the planar waveguide (WG-coating). Maximum output powers, repetition rates, and minimum pulse durations are 61 mW, 1103 kHz and 215 ns for OC-coating, 39 mW, 1052 kHz and 275 ns for WG-coating, and 26 mW, 1119 kHz and 217 ns for M-coating, respectively.

Tm:KY-x-yGdxLuy(WO) planar waveguide laser passively Q-switched by single-walled carbon nanotubes.

A Tm monoclinic double tungstate planar waveguide laser is passively Q-switched (PQS) by a saturable absorber (SA) based on single-walled carbon nanotubes (SWCNTs) randomly oriented in a polymer film. The laser is based on a 18 µm-thick 5 at.% Tm:KY-x-yGdxLuy(WO) active layer grown on an undoped (010)-oriented KY(WO) substrate by liquid phase epitaxy with determined propagation losses 0.

Femtosecond-laser-written Tm:KLu(WO) waveguide lasers.

Depressed-index channel waveguides with a circular and photonic crystal cladding structures are prepared in a bulk monoclinic Tm:KLu(WO) crystal by 3D direct femtosecond laser writing. The channel waveguide structures are characterized and laser operation is achieved using external mirrors. In the continuous-wave mode, the maximum output power of 46 mW is achieved at 1912 nm corresponding to a slope efficiency of 15.