Generation of 167 W infrared and 124 W green power from a 13-GHz, 1-ps rod fiber amplifier

Abstract

We report on the direct amplification of 1-ps pulses at 1.3 GHz repetition rate by using a large mode area rod fiber amplifier. An average power of 167 W at 1040 nm with nearly transform-limited duration is generated and converted into 124 W average green power through second harmonic generation. Both infrared and green pulses exhibit diffraction-limited beam quality. A frequency doubling efficiency of 75% and a pump-to-green efficiency of 45% have been achieved, which are to our knowledge the highest reported for fiber laser systems.

Generation of 180 W average green power from a frequency-doubled picosecond rod fiber amplifier

“…3(d), and thus the ps green laser exhibits diffractionlimited beam quality. However, it is obvious that the temporal walk-off is an issue with a choice of 20 mm LBO SHG crystal [22] and a 15 mm crystal would be recommended for the future development to minimize this unwanted effect [21,22].…”

“…Recently, rod fibers with a mode field area of about 3000 μm 2 have been reported to generate 292 W IR average power with diffraction-limited beam quality [20]. Direct amplification of 1-ps pulses at 1.3 GHz repetition rate using this type of rod fiber has been demonstrated to achieve 167 W IR average power and converted into 120 W green average power through frequency doubling [21]. In this paper, we demonstrate the direct amplification of 2.3-ps, 704 MHz pulses and extend IR average power to 270 W. Efficient frequency doubling has been carried out to generate 180 W average green power.…”

260 fs, 403 W coherently combined fiber laser with precise high-order dispersion management

“…The unique photonic crystal structure of rod-type PCF also effectively suppresses TMI, thus addressing the second issue. Rod-type PCF has been successfully applied in fiber amplifiers that generate average powers in the range of hundred watts [ 9 – 11 ] and pulse energies at the millijoule level [ 12 , 13 ], enabling various high-power laser applications. NKT Photonics A/S recently reported achieving pulses with an average power of 248 W in a newly designed rod-type PCF with enhanced TMI suppression, thereby extending the power scaling boundary of a single rod-type fiber [ 14 ].…”

Efficiency Enhancing Technique for Rod Fiber Picosecond Amplifiers with Optimal Mode Field Matching

“…The DCF system overcomes the above disadvantages of solid-state lasers. However, to satisfy single-mode operation, the mode field area of the DCF is limited to about 700 μm 2 [ 5 ]. The limited mode field area of DCF causes significant nonlinearity and damage under high power operation, which limits output power.…”