High-Energy Single-Frequency Core-Pumped Er-Doped Fiber Amplifiers

Main Group Elements Activated Near‐Infrared Photonic Materials

“…[45][46] The third window operates mainly in the region centered at 1550 nm and is widely applied for commercial long-distance communications due to the extremely low losses. [47][48] Currently, the available communication bands are mainly centered around the C-band due to the limited operating range of NIR photonic materials. [38,41]…”

Improvement of Output Characteristics of a Large-Mode-Area Er-Doped Fiber Amplifier Pulse Pumped by a Cascaded Raman Fiber Laser With a Low Repetition Frequency

“…In particular, pulses with a single frequency, a high energy (>1 mJ) and a long pulse duration (>100 ns) are required in the field of coherent doppler wind lidars (CDWLs). Laser systems emitting single-frequency, highenergy pulses using fiber amplifiers have been developed for a wavelength of 1.5 µm for CDWLs [9], [10], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24]. In particular, several groups have reported a high-energy master oscillator power amplifier (MOPA) system using an Er-Yb co-doped fiber amplifier (EYDFA) [12], [14], [15], [19], [20] or an Er-doped fiber amplifier (EDFA) [13], [16], [17], [18], [21], [22], [24] with a large mode area (LMA) to avoid the stimulated Brillouin scattering (SBS) due to nonlinearities in Manuscript received 13 September 2023; accepted 17 September 2023.…”

“…Recently commercially available, a cascaded Raman fiber laser (CRFL) which emits a high-power 1480 nm beam with a single mode fiber is a good candidate for a pump source to obtain high efficiency due to the realization of core pumping [26]. Although several groups have demonstrated the amplification of single-frequency pulses using an LMA EDFA pumped by the light from a CRFL [18], [21], [22], [24], only one group showed an output pulse exceeding 1 mJ [21]. A phosphate-glass based LMA EDF which could absorb 1480 nm pump light better than a typical silica based LMA EDF was used in this study.…”

Single-frequency high-energy pulses from an Er:Yb glass planar waveguide amplifier with good beam quality

“…6) In particular, pulses with a high energy (>1 mJ), a long pulse duration (>100 ns), a single frequency and good beam quality (M 2 < 2) are required in the research field of coherent Doppler wind lidars (CDWLs). [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Several groups have developed master oscillator power amplifier (MOPA) systems using an Er, Yb: co-doped fiber amplifier [10][11][12][13][14][15][16] or an Erdoped fiber amplifier (EDFA) [17][18][19][20][21][22][23] with a large mode area (LMA) to avoid stimulated Brillouin scattering (SBS) and laser induced damage (LID). Most work on all-fiber MOPA systems has been demonstrated with pulse energies of up to 1.5 mJ due to SBS or amplified spontaneous emission (ASE) dynamics.…”