Pr3+-doped 1.3 μm fibre laser using direct coateddichroic mirrors

A 1.3 μm fibre laser consisting of a 1000 ppm (mol) Pr³⁺ -doped fluoride glass fibre with dichroic mirrors coated onto the fibre endfaces and an Nd-YLF pump laser is presented. The output mirror reflectivity R is calculated to be 50% at the lasing wavelength. Producing a maximum output power of 50 mW. The laser threshold and slope efficiency are 300 mW and 8%, respectively. The theoretically predicted values correspond with the experimental values     

High-power, mode-locked Nd:fibre laser pumped by aninjection-locked diode array

A neodymium-doped fibre laser has been actively mode-locked to produce pulses shorter than 120 ps using an intracavity acousto-optic loss modulator. The laser operated at 1.088 μm at an average power of 5 mW when pumped by an injection-locked diode array, which coupled approximately 40 mW of 0.82 μm into the fibre. A peak pulse power of 1 kW was obtained in Q-switched operation     

All fibre laser system with 0.1 W output power in blue spectralrange

A ytterbium sensitised thulium-doped blue upconversion ZBLAN fibre laser pumped at 1065 nm by a high power, diode pumped, double clad fibre laser is demonstrated. With a pump power of 2.8 W at 1065 nm, a blue output power of 106 mW at 482 nm is achieved     

High-power broadly tunable erbium-doped silica fibre laser

A Ti:sapphire laser at 980 nm has been used to pump a grating-tuned erbium-doped silica fibre laser. 540 mW launched pump power produces up to 270 mW tunable output near 1.55 mu m, with more than 250 mW obtainable from 1.52 to 1.57 mu m.<>     

Efficient upconversion pumping at 1.064 mu m Tm/sup 3+/-doped fluoride fibre laser operating around 1.47 mu m

1.064 mu m upconversion pumping was used to operate a highly efficient CW and Q-switched thulium (Tm/sup 3+/)-doped fluoride fibre laser at around 1.47 mu m. The maximum CW output power was 100 mW for a launched pump power of 570 mW. The threshold power was 200 mW, the slope efficiency 27% and the wavelength width 20 nm. A peak power of 70 W was generated for Q-switching at a launched pump power of 300 mW.<>     

High-power singlemode AlGaInAs/InP 14xx-nm laser for uncooled application

360 mW fibre output power and excellent wavelength stability within 0.6 nm over a temperature range from 10 to 70/spl deg/C in a grating-stabilised AlGalaAs/InP 14xx-nm pump laser is reported. A fibre output power of 300 mW was maintained from 10 to 70/spl deg/C as the driving current was increased by 36% or 1.34 dB.     

Semiconductor laser pumping of continuous-wave Pr/sup 3+/-doped ZBLAN fibre laser

Blue semiconductor laser pumped continuous-wave laser oscillation of a Pr-doped ZrF/sub 4/-BaF/sub 2/-LaF/sub 3/-AlF/sub 3/-NaF fibre in the red spectral range is reported for the first time. The pump power is provided by a frequency-doubled optically pumped semiconductor laser system. When pumped with 300 mW at a wavelength of 479.7 nm, the Pr/sup 3+/-laser emitted 94 mW of output power at a wavelength of 635 nm. Threshold pump power and slope efficiency with respect to the incident pump power were determined to be 49.7 mW and 41.5%, respectively.     

Wavelength tunable CW Raman fibre ring laser operating at 1486-1551nm

A continuous-wave, wavelength tunable Raman fibre ring laser has been demonstrated operating at 1485-1551 nm with peak output power of over 400 mW, pumped at 1420 nm by a 1.58 W fibre laser     

High-power 1.02 mu m InGaAs/AlGaAs strained quantum well lasers with GaInP buried waveguides for pumping Pr/sup 3+/-doped optical fibre amplifier

High power 1.02 mu m single spatial mode laser diodes with low-loss (3.3 cm/sup -1/) GaInP buried waveguides have been developed for pumping Pr/sup 3+/-doped optical fibre amplifiers. A maximum CW light output power of 415 mW and an optical fibre output of 71 mW at 200 mA have been achieved. A preliminary lifetest showed stable operation for over 2300 h under 100 mW CW conditions at 50 degrees C.<>     

Temperature-tunable 3.5 mu m fibre laser

Use of a Peltier element permits adjustment of fibre temperature over the range 5-41 degrees C, providing a tuning range of 30 nm for the 3.5 mu m laser. In this temperature range the laser emits nearly 1 mW at 130 mW pump power.<>     

Short-cavity, passively modelocked fibre laser oscillator at 1.5 /spl mu/m with 550 MHz repetition rate and high average power

A short-cavity fibre laser oscillator emitting 12 ps-long pulses at the fundamental cavity frequency of 550 MHz is reported. The simple, stable and ultra-compact laser cavity consists of a short active fibre section which is spliced to a narrowband fibre Bragg grating, and a butt-coupled semiconductor saturable absorber mirror. Only 8 cm of the heavily Er/Yb co-doped phosphate-glass active fibre is sufficient to produce as much as 775 mW of average output power at 1.5 /spl mu/m directly from the oscillator.     

Efficient high power operation of erbium 3 μm fibre laserdiode-pumped at 975 nm

Efficient CW operation of a 2.71 μm Er,Pr:ZBLAN double-clad fibre laser pumped with a single diode laser operating at a wavelength of 975 nm is described. A maximum output power of 0.5 W and a slope efficiency of 25% (with respect to the launched pump power) were obtained. Threshold pump powers of <200 mW launched were measured and consistent relaxation oscillations in the output from the fibre laser indicate the presence of a saturable absorption mechanism     

Single-polarisation, single-frequency, 2 cm ytterbium-doped fibre laser

A single-polarisation, single-frequency, ytterbium-doped silica fibre laser has been demonstrated in a 2 cm linear cavity. The output power reaches 35 mW with an optical signal-to-noise ratio greater than 65 dB. A polarisation-maintaining fibre Bragg grating is used as the polarisation-dependent reflector to generate the single-polarisation output with the polarisation extinction ratio greater than 20 dB. The laser works stably for 2 h under laboratory conditions     

Upconversion pumped green lasing in erbium doped fluorozirconate fibre

The first demonstration of upconversion pumped lasing at green wavelengths in an Er/sup 3+/-doped fluorozirconate fibre laser is reported. 15 mW continuous wave emission at a wavelength of 546 nm has been achieved for an absorbed pump power of 300 mW.<>     

Erbium doped fluorozirconate fibre laser operating at 1.66 and 1.72 mu m

Pulsed laser emission at 1.66 and 1.72 mu m has been observed in a multimode fluorozirconate fibre doped with erbium under excitation at 514 nm. The threshold absorbed pump power for laser oscillation was measured as 90 mW.<>     

One-stage erbium ASE source with 80 nm bandwidth and low ripples

A one-stage erbium ASE source that has an 80 nm flat bandwidth is demonstrated. The ASE source is realised in a 37 m erbium-doped fibre with a 1480 nm laser diode and a 980 nm laser diode as forward and backward pumps respectively. High output power up to 13.5 dBm is obtained with a total pump power of 95.7 mW     

Neodymium-doped fibre amplifier at 1.064 μm

For the first time, a fibre amplifier with a small signal gain of more than 30 dB at 1.064 μm has been realised. The amplifier employs an Nd-Al codoped fibre and a 0.808 μm pumping laser diode which offers 50 mW incident pump power     

Tunable CW fibre Raman ring laser centred at 1.41 mu m

The first demonstration of a CW tunable fibre Raman ring laser operating around 1.4 mu m is reported. This laser was pumped by a 3 W Nd:YAG laser operating at 1.319 mu m and tuned over a 10 nm range with a maximum output power of 40 mW.<>     

Efficient silica-based Ho3+ fibre laser for 2 μmspectral region pumped at 1.15 μm

For the first time an Ho³⁺ silica fibre laser has been realised using a Bragg grating as the input coupler and a fibre pump source at 1.15 μm. The output power of 280 mW at 2 μm is to the authors' knowledge the highest value reported so far for Ho³⁺ silica fibre lasers     

Diode-laser-pumped Nd3+-doped fibre laser operating at 938 nm

We report the efficient diode-laser-pumped operation of an Nd3+-doped single-mode fibre laser at 938 nm on the three- level transition 4F3/2?4I9/2. An output power in excess of 3 mW has been obtained with a threshold of 1.9 mW.