Generation of Raman dissipative solitons near 13 microns in a phosphosilicate-fiber cavity

Abstract

An external-cavity generation of powerful ultrashort pulses in an all-fiber scheme by using a new type of phosphosilicate polarization maintaining fiber is investigated. The phosphorus-related Stokes shifted Raman pulse near 1.3 microns is observed. Optimization of Stokes output spectrum depending on pump pulse duration (chirp), energy and output coupling ratio of the cavity is performed. As result, the output energy of highly-chirped pulses compressible to 570 fs reaches 1.6 nJ.

Raman-converted high-energy double-scale pulses at 1270 nm in P2O5-doped silica fiber

“…One of the promising ways to generate double-scale pulses around 1.3 μm is spectral transformation of such pulses from 1.1-μm range through single-cascade Raman shift in phosphorus-doped silica fibre [25]. A few studies in this field have been carried out, however, the achieved pulse energy in the 1.3-µm range was rather low (15 nJ [26], 1.6 nJ [27]), and the fraction of radiation energy transformed into the 1.3-µm range did not exceed 30% of the total Raman-converted energy.…”

All-Fiber Dissipative Soliton Raman Laser Based on Phosphosilicate Fiber

“…The resonant Raman frequency shift is 39.6 THz, which is much larger than the Raman shift of standard SiO 2 bond (13.2 THz) [11]. This larger Raman shift offers a possibility to reach near 1300 nm by pumping with well-established picosecond Yb 3+ -doped fiber (YbDF) lasers [12], [13]. The advantage of pumping by a picosecond source is that it is easier to achieve synchronization of the two cavities and no active cavity length stabilization is required due to the long duration of the pulses.…”

“…High energy pulses can be achieved by operating the Raman laser in normal dispersion regime [14]-[16]. Previously, synchronously pumped Raman lasers using P-doped fiber have been reported in [12] and [13]. Compared to the published work [12], our system produces orders of magnitude shorter pulses; therefore, the peak power is much higher making our laser suitable for multiphoton imaging.…”

Эффект укорочения импульсов в активной среде Yb волоконных лазеров с синхронной модуляцией накачки

“…Синхронная накачка является эффективным методом активной синхронизации мод излучения в различных типах лазеров [1][2][3], включая волоконные лазеры на основе эффекта вынужденного комбинационного рассеяния [4,5]. Однако в волоконных лазерах с усилением на основе вынужденного излучения, использующих непосредственную диодную накачку, возможности такого метода не были исследованы в полной мере.…”