741 research outputs found
Electro-optically Q-switched Er:YAG laser in-band pumped by an Er,Yb fiber laser
No full textElectro-optically Q-switched operation of an Er:YAG laser at 1645nm end-pumped by a cladding-pumped Er-Yb fiber laser is reported. Pulse energies up to 15mJ have been generated at a pulse repetition frequency of 29Hz
Highly efficient Ho:YLF and Ho:YAG lasers pumped by Tm-doped silica fibre laser
No full textEfficient operation Ho:YLF and Ho:YAG lasers end-pumped by a tunable cladding-pumped Tm-doped silica fibre laser is reported. Output powers of 4.8W at 2066nm and 6.4W at 2097nm were obtained from the Ho:YLF and Ho:YAG lasers for < 9.6W of incident pump at 1940nm and 1905nm respectively
Highly efficient Er,Yb-doped fiber laser with 188W free-running and > 100W tunable output power
No full textEfficient high-power operation of an erbium-ytterbium co-doped fiber laser cladding-pumped by two spatially-multiplexed and polarization combined 975 nm diode-stacks is reported. Up to 188 W of continuous-wave output at 1.57 µm was generated with a beam-quality factor (M2) of 1.9 and an overall slope efficiency with respect to launched pump power of 41% (and 43% for output powers <120W). Tunable operation was demonstrated by use of an external cavity containing a diffraction grating and a maximum output power of 108 W at 1538 nm was generated for a launched pump power of ~ 336 W. The operating wavelength was tunable from 1531 to 1571 nm, with >100W output power over a tuning range of 36 nm from 1532 nm to 1568 nm
Power scaling of continuous-wave and Q-switched hybrid fiber-bulk erbium lasers at 1645 nm
No full textWe report recent progress in the development of high-power Er,Yb fiber-laser-pumped Er:YAG lasers at 1645nm operating in continuous-wave and Q-switched regimes. Strategies for further scaling of output power and pulse energy are considered
Highly efficient in-band pumped Er:YAG laser with 60 W of output at 1645 nm
No full textA high-power Er:YAG laser that is in-band pumped by a high-power cladding-pumped erbium-ytterbium codoped fiber laser operating at 1532 nm is reported. The Er:YAG laser produced 60.3 W of continuous-wave output at 1645.3 nm in a beam with M<1.2 for 32.4 W of incident pump power. The slope efficiency with respect to incident pump power at pump powers of >20 W was ~81%. In the Q-switched mode of operation, a slightly modified resonator configuration incorporating an electro-optic Q switch produced pulses of ~4 mJ energy and ~100 ns (FWHM) duration, corresponding to a peak power of ~42 kW at a repetition rate of 1 kHz for an incident pump power of 16.8 W. The prospects for further improvement in continuous-wave and Q-switched performance are discussed
High-power widely tunable Tm:fibre lasers pumped by an Er, Yb co-doped fibre laser at 1.6 microns
No full textHigh-power and widely tunable Tm-doped silica fibre lasers cladding-pumped and core-pumped by a 1565nm Er,Yb fibre laser are reported. Output power up to 19.2W was generated from the cladding pumped cavity configuration for ~38.2W of launched pump power and with slope efficiency up to ~72% with respect to absorbed pump power. Wavelength tuning was realized by use of an external cavity containing a diffraction grating. A maximum output power of 17.4W at 1941nm was generated for 38.2W of launched pump power and the operating wavelength could be tuned over 202nm from 1859 to 2061nm. In the core-pumped configuration, a maximum output power of 12.1W was generated at 1851nm for 23.1W absorbed pump power using a simple free-running cavity configuration with only ~24cm of Tm-doped fibre. By employing a tunable cavity configuration, the operating wavelength of the core-pumped Tm:fibre laser could be tuned over 250nm from 1723-1973nm at multiwatt power levels
Highly efficient erbium-ytterbium co-doped fibre laser with 188W output power at 1565nm
No full textHigh-power solid-state laser sources operating in the eye-safe wavelength regime around ~1.5-1.6 µm have numerous applications in areas such as remote sensing, range finding, and free space and satellite communications. Cladding pumping of Er,Yb-doped fibre lasers (EYDFLs) offers a promising route to output in this spectral region with the attraction of a geometry that allows scaling to high power levels without decreasing efficiency or degrading beam quality. Moreover, the broad emission linewidths that are typical in glass hosts allows for flexibility in the operating wavelength. To date, operation of an EYDFL at 103 W has been reported with a slope efficiency of 30% with respect to launched pump power. In this paper we report a highly efficient Er co-doped fibre laser, cladding pumped by a 975 nm diode-stack source, that generates up to 188 W of continuous-wave (cw) output at 1565 nm with an overall slope efficiency of 41% with respect to launched pump power. At a launched pump power of 336 W, the EYDFL when operated in tunable cavity configuration, generated a maximum output power of 108 W at 1538 nm and the lasing wavelength could be tuned over 36 nm from 1532 to 1568 nm at output power levels >100 W with a linewidth of ~1nm
Ultra-efficient Er:YAG laser with 60W output power at 1645nm end-pumped by an Er-Yb co-doped fibre laser
No full textHigh-power solid-state lasers operating in the eyesafe wavelength regime around ~1.5-1.6 µm have numerous applications and provide an ideal platform for nonlinear frequency conversion to the mid-infrared. The traditional approach for producing laser output in this wavelength region is via direct diode pumping of erbium-ytterbium codoped bulk glass or crystal lasers. Power scaling of such lasers has proved rather difficult due to the high thermal loading density which results from a large quantum defect, the need for a relatively high active ion concentrations and additional heat loading due to energy-transfer-upconversion. Another approach for generating laser emission in the 1.5-1.6 µm wavelength regime is via cladding-pumping of erbium-ytterbium co-doped fibre lasers. Fibre lasers are becoming increasingly attractive for high power generation due to their high efficiency and immunity from thermal effects. However, due to their small core sizes and long device length, fibre laser suffer from detrimental nonlinear effects and are susceptible to core damage, especially when operating in the high peak power pulsed regime. In-band pumping of bulk solid-state lasers with high-brightness fibre sources is an attractive alternative approach which combines the advantages of efficient cw high-power generation in cladding-pumped fibre lasers with the energy storage and high pulse energy capabilities of bulk solid-state laser crystals. A key attraction of this fibre-bulk hybrid laser scheme is that most of the heat generated via quantum defect heating is deposited in the fibre, and thermal effects in the bulk laser are dramatically reduced leading to the prospect of much improved efficiency, beam quality and higher average output power. This approach has already been successfully applied to Er:YAG [1] and Er:LuAG [2] lasers pumped (in-band) by an erbium fibre laser, with multi-watt average powers up to ~7W and slope efficiencies with respect to incident pump power up to 54% and 40% respectively. In this paper we report an Er:YAG laser with much higher output power and higher efficiency end-pumped by a tunable cladding-pumped Er,Yb fibre laser. The laser yielded 60 W of output at 1645.3 nm for 82 W of incident pump power from the Er,Yb fibre laser at 1532 nm. The corresponding slope efficiency was 80.7% with respect to incident pump power
Efficient single-axial-mode operation of a Ho:YAG ring laser pumped by a Tm-doped silica fiber laser
No full textEfficient single-frequency operation of a Ho:YAG ring laser at room temperature with a traveling-wave TeO2 acousto-optic modulator to enforce unidirectional operation is reported. By use of a 2-at.% Ho3+-doped 10-mm-long Ho:YAG rod, end pumped by a cladding-pumped tunable Tm-doped silica fiber operating at 1.9 µm, the Ho:YAG ring laser yielded 3.7 W of single-frequency output at 2.1 µm in a diffraction-limited TEM_00 beam with M2 < 1.1 for an incident pump power of 8.8 W. The rf power required for unidirectional operation was 0.3 W and corresponded to an increase in cavity loss for the lasing direction (due to diffraction) of only 0.5%. The prospects for further improvement in efficiency are discussed
11W broadband amplified spontaneous emission fiber source at 2 microns
No full textHigh-power operation of Tm-doped superfluorescent fiber source is described. Over 11W of single-ended output spanning the wavelength-range from 1940nm to 1976nm was obtained with a slope efficiency of 38% with respect to launched pump power
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