Average power of 11 kW from spectrally combined, fiber-amplified, nanosecond-pulsed sources

Abstract

We report on spectral combination of four high repetition rate 5 ns pulsed Yb-doped fiber amplifiers at 1 microm wavelength. The output beam is spatially and temporally superposed by use of an all-reflective diffraction grating. 1.1 kW average power and 220 microJ pulse energy were extracted with a combining efficiency of 99%.

Development of kW class Nd:YAG composite ceramic thin disc laser

“…Different types and shapes of laser gain medium are studied to design the amplifier, and the characteristics of thin disc, rod, and large mode area fiber are compared [3][4][5][6][7][8][9]. (Refer to Table 1) In this type of amplifier, we are concern about the gain loss and deterioration of beam quality by heat.…”

High repetition rate, high average power nanosecond laser using two Yb-doped PCF rod fibers

“…Recently, a nanosecond Yb-doped fiber systems using a DMF (Distribute Mode Filitering) fiber [2] and LPF (Large Pitch Fiber) [3] have been developed, and several hundred watts of output power was reported. [4] A fiber CPA(Chirped Pulse Amplification) system was developed and a average power of 830 W(640fs, 78MHz) with excellent beam quality was obtained [5].The spectral combination of four pulsed fiber amplifiers has been demonstrated, and a total output power of 1.1 kW was achieved [6].…”

Yb-doped fiber laser system generating 12-ns 0.7-mJ pulses at 82 kHz at 977 nm

“…Yb-doped fiber laser systems generating pulses with multi-MW peak power, energy of several millijoule in both oscillator [1] and amplifier [2][3][4] configuration have been demonstrated these last 5 years. However, all these impressive performances were based on a quasi-four-level laser operation in the 1020 nm -1100 nm spectral range.…”