We have demonstrated a high-power and high-efficiency erbium:ytterbium (Er:Yb) codoped fiber laser that produces 297 W of continuous-wave output at 1567 nm. The slope efficiency with respect to the launched pump power changed from 40% 19% higher due onset Yb colasing 1067 However, was essential for suppression catastrophic pulsation high powers otherwise results if Yb-band gain is allowed build up. Spectroscopic characteristics impact on 1567-nm are also discussed.

We report a picosecond fiber MOPA pumped supercontinuum source with 39 W output, spanning at least 0.4-2.25 µm repetition rate of 114.8 MHz.The 2m long PCF had large, 4.4 diameter core and high-delta design which led to an 80% coupling efficiency, high damage threshold rapid generation visible continuum from the input pulses.The relatively uniform power density across spectral region was ~31.7 mW/nm corresponding peak ~12.5 W/nm for 21 ps increased 26.9 by reducing 28 MHz.This represents...

We present a single-frequency, single-mode, plane-polarized ytterbium-doped all-fiber master oscillator power amplifier source at 1060 nm generating 264 W of continuous-wave output power. The final-stage operated with high gain 19 dB and conversion efficiency 68%. There was no evidence rollover from stimulated Brillouin scattering even the highest power, maximum limited only by available pump

Optical microfibres have recently attracted much attention for nonlinear applications, due to their tight modal confinement. Here, we report broadband third harmonic generation based on the intermodal phase matching technique in silica of several centimetres. The signal is predominantly generated from taper transition regions (rather than waist), wherein range diameters permits over a wide bandwidth. Microfibres up 4.5 cm long were fabricated with waist below 2.5 μm allow λ = 1.55 pump match...

We present a cladding-pumped single-frequency, single-mode erbium:ytterbium codoped fiber master-oscillator power amplifier source generating up to 151 W of continuous-wave output at 1563 nm with 33% slope efficiency and 20 dB gain. This was also tunable had stable operation range 1546to1566 an level in excess 125 W. The doped exploited large-core design for improved handling mitigation stimulated Brillouin scattering. There no sign having scattering even the highest power. Despite large...

We demonstrate the suppression of stimulated Raman scattering in a high power, single-mode Yb-doped fiber amplifier using W-type core structure.Raman-scattered light is not guided by core.The consists master oscillator power (MOPA) system, seeded with 103 ps pulses at 32 MHz repetition rate final amplification stage.An average output 53 W, which corresponds to 13 kW peak was achieved 23 m long double-clad without any significant loss due transfer from signal wavelength 1060 nm Stokes 1114...

An Er:Yb codoped fiber amplifier chain for the generation of pulses coherent lidar applications at a wavelength near 1.5 µm is reported. The final 1.8-m-long power amplification stage had 50‐µm core diameter and yielded 23-dB energy gain, resulting in 0.29-mJ, 100-ns repetition rate 4 kHz with no Brillouin scattering an M2 2.1.

We theoretically detail and explain how to control unwanted excess gain for higher order modes in cladding-pumped large-core ytterbium-doped fiber amplifiers operating on the fundamental mode by using a small inner cladding pumping close emission wavelength so-called tandem-pump configuration. Such can otherwise limit core size. study this experimentally comparing level of amplified spontaneous at edge conventional diode-pumped tandem-pumped multimode fiber. also discuss potential benefits...

We present a pulsed fiber laser system with average power up to 265 W, pulse energy 10.6 mJ, duration adjustable in the range 500 ps–500 ns, repetition rate fully controllable from single-shot operation 1 MHz, and ability control peak independently of energy. The has compact, all-spliced construction. Such versatile will have wide applications materials processing.

A continuous-wave (CW) master oscillator-power amplifier (MOPA) fiber source, tunable around 978 nm, was frequency-doubled to 488.7 nm. Both the laser and were made with cladding-pumped jacketed air-clad Yb-doped fibers. The MOPA generated up 2.7 W of power in an output beam M/sup 2/ value 1.8. This a periodically poled potassium titanyl phosphate crystal at room temperature, single-pass configuration. blue light had CW 18.1 mW, nearly Gaussian spatial intensity profile, 1.7.

We demonstrate a high-power single-mode cladding-pumped Raman fiber laser. The laser consists of 1.2 km long germanium-doped double-clad in linear cavity, which is spliced to fiber. end pumped by multimode erbium-ytterbium-doped fiber, coupled the inner cladding embedded core was designed be single mode at Stokes wavelength, and up 10 W power obtained 1660 nm from end. has slope efficiency 67% threshold 6.5 W.

In this paper, we analyze the optical conversion efficiency of a multimode pump source into diffraction-limited beam in cladding-pumped Raman fiber lasers and amplifiers. We theoretically derive relation cladding/core area ratio for efficient energy transfer from first Stokes while avoiding second generation that impedes Stokes. addition, investigate experimentally limits on pulse-pumped double-clad fiber. obtained peak power excess 75% pulse 60%. found spatial mode depletion is main...

We report a 100 W continuous-wave cladding-pumped fiber Raman laser operating at 1120 nm. The consists of an 85 m long germanium-doped double-clad in 4% - 100% linear cavity, which is end-pumped by multimode ytterbium-doped source 1064 has slope efficiency 71% with respect to launched pump power. output M² measured be ~ 1.6 80

An all-fiber, narrow-linewidth, high power Yb-doped silica fiber laser at 1179 nm has been demonstrated. More than 12 W output obtained, corresponding to a slope efficiency of 43% with respect launched pump power, by core-pumping 1090 nm. In order increase the absorption, was heated up 125 degrees C. At maximum suppression amplified spontaneous emission more 50 dB. Furthermore, theoretical work confirms that proposed architecture can be easily scaled higher power.

A tunable high-power cladding-pumped neodymium-doped aluminosilicate fiber laser is demonstrated. The maximum power reached was 2.4 W with a slope efficiency of 41% and threshold pump 1.68 W, both respect to launched power, when cladding pumped by two 808-nm diode sources at ends. dependence the tuning range on length investigated. changed from 922 942 nm for 25-m-long 908-938 14-m-long fiber, because reabsorption effects. output linewidth 0.26 in diffraction-limited beam. Operation...

We demonstrate a continuous-wave (CW) single-frequency narrow-linewidth laser at 1552 nm with an output power of 83 W using master-oscillator amplifier configuration. A seed from all-fiber distributed feedback-laser linewidth 13 kHz was polarization scrambled and boosted through chain amplifiers in The last amplification stage consisted highly efficient cladding-pumped large-core erbium-ytterbium co-doped fiber which helped increase nonlinear thresholds.

Transverse mode competition and instabilities in high-power fiber oscillators have been studied experimentally by monitoring the dynamic power exchanges characteristic frequencies of transmitted fundamental (FM) scattered high-order modes (HOMs) laser cavity under CW pulsed pumping.The FM HOM evolution indicates presence two competing effective cavities which result rich output dynamics full chaotic operation.The thermal inversion related contributions to observed identified associated...

We demonstrate a cladding-pumped single-mode plane-polarized ytterbium-doped fiber laser generating 633 W of continuous-wave output power at 1.1 microm with 67% slope efficiency and polarization extinction ratio better than 16 dB. The is end pumped through both ends shows no evidence roll-over, even the highest power, which limited only by available pump power.

The influence of the core diameter and fiber length on beam quality transmitted was investigated theoretically experimentally for highly multimode step-index fibers with a numerical aperture 0.22 using fully monolithic setup. We show that it is possible to maintain nearly diffraction-limited (M <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ≈ 1.3) through 100 m long fibers. For 60 μm 380 one can still deliver an M value 2.1. high-power...