810-W single transverse mode Yb-doped fiber laser

Abstract

We demonstrate 810-W fundamental mode beam from Yb-doped fiber laser operating at 1092 nm. Single-transverse-mode operation is achieved through distributed mode filtering in a coiled 20-µm diameter and 0.06 NA core fiber. OCIS codes: (060.2320) Fiber optics amplifiers and oscillators; (140.3070) Infrared and far-infrared lasersUse of multimode core fibers with diffraction-limited output beams and recent advances in high power and high brightness diode lasers have led to currently occurring dramatic power increase from Yb-doped fiber lasers [1, 2]. Large size core allows to significantly reduce detrimental nonlinear effects and to raise optical damage threshold as well as to facilitate pump power coupling and efficient pump absorption in a double clad structure. As a result, fiber lasers currently represent the solid-state laser technology with the highest available powers and the best beam quality.

Fibre lasers and related technologies

“…Further, there are some issues regarding thermal build-up as a result of the air-cladding acting as a buffer to heat flow. In any case, the current record for high power single-mode fibre lasers using conventional polymer cladding is surpassing 4700 W [69] and recent claims quote $800 W with 1 kW versions to be announced in May [70], scaleable with pump power and limited only by design. These results of similar magnitude involving polymer-clad system have been questioned as the suggestion that researchers are reporting performance that lasts only a few seconds prior to the polymer cladding burning have been made.…”

Investigation of structural dependence of host erbium-doped triangular-lattice PCF on lasing properties and design of high performance laser

“…Here too the discussion was not directed towards the effect of PCF geometry on laser performance, which is truly very important from the design point of view. Development of double clad PCF technology has made it possible to design a fiber laser with very high output power (P out ) [20,21]. However, the output power of double cladding fiber lasers is typically restricted by available pump source.…”

A new vision of photodarkening in Yb³⁺-doped fibers

“…Unfortunately, this material suffers from photodarkening (PD) effect, i.e., absorption in the visible and near infrared originating from the creation of color centers in the silica network. This problem is typically overcome by using large-mode-area (LMA) fibers [4]. But even with these fibers photo-induced absorption (PIA) has been observed [5].…”