High Power, Linearly Polarized Yb-doped Fiber Laser

Single polarization fibers and applications

“…In this case the active dopants are deposited directly during fabrication into the core of the single polarization fiber. Both approaches have been experimentally demonstrated [11,12]. As an example, Figure 4 shows the single polarization output power measured using a dual-hole Yb-doped single polarization fiber.…”

Challenges in single-polarization fibers (Invited Paper)

“…In this section we report two experiments using dual-hole SP fibers to produce linear polarized light in fiber lasers. 3,20 In the first experimental work, the linear polarization laser output was achieved using a passive SP fiber. 3 The laser cavity comprises a PM gain fiber and a SP fiber pumped with un-polarized light.…”

“…1,2 High power fiber lasers with linearly polarized output have also been reported. [3][4][5] Linearly polarized output is required for phase-matched nonlinear conversion configurations often used to achieve a wider range of operating wavelengths. Moreover, most methods of coherent beam combination, a method of scaling output to even higher powers, also require linearly polarized laser output.…”

“…5 Recently, there have been demonstrated two different, all-fiber, linearly polarized lasers: one through bend-induced polarization dependent loss in a birefringent, double clad fiber, 4 the other with a single polarization fiber fusion spliced to a high birefringence, elliptical core double clad fiber. 3 In the present work, the operating principles of the single polarization fiber will be detailed. Two realizations of the high power fiber laser, one with a birefringent double clad spliced to a short section of polarizing fiber, the other with the single polarization operation integrated into the double clad structure will be discussed.…”

5kW High peak power, 0.2mJ high pulse energy, linearly-polarized pulsed laser from a single all-fiber oscillator

“…Fiber lasers with linearly-polarized output are required in various applications, such as fiber sensing, polarized laser beam combining, second-harmonic generation (SHG), frequency mixing for mid-IR generation in non-linear crystals and for many other non-linear frequency conversion applications [1,2].…”