Scalable side-pumped, gain-guided index-antiguided fiber laser

Development and prospect of high-power doped fibers

“…LMA fibers based on thermal guiding, index-antiguiding [80] and gain-guided, index-antiguided [81][82][83][84] mechanisms have come up as interesting approaches for LMA single-mode operation. However, they are still in the theoretical research stage with limited certifications for effective single-mode operation in high-power fiber lasers.…”

Threshold Characteristics Analysis of Dual-end-pumped Nd3+-doped Gain-guided and Index-antiguided Fiber Lasers

“…The allowed fractional variation in the pump light distribution in the fiber core should be below 61% [4] for GG-IAG fiber to maintain single mode oscillation, and which is called uniformity of pump light distribution here and can be defined as: P u =(P pmax -P pmin )/P pmax 100% [4] .P u changes process with the fiber length L is shown in Fig.4.P u increases with the increasing of L.…”

“…Pump light propagation and threshold characteristics are both researched. Under the requirement of the uniformity of pump power along the fiber [4] , the maximal fiber length is 9.3cm. The relationship between threshold pump power P th and doped concentration N, fiber length L, fiber radius a is researched respectively.…”

“…However, the major limitations to high power lasers in conventional single mode ¿bers are undesired optical nonlinear effects [1][2][3][4] . The most direct method to solve these problems is increasing the mode area to reduce the optical power density [5] , thus large mode area single-mode fibers have recently attracted a lot of attentions, such as photonic crystal fibers [6] , chirally coupled core fibers [7][8] and so on.…”

Threshold characteristics analysis of a uniformly side-pumped Yb3+-doped gain-guided and index-antiguided fiber laser

“…However, the major limitations to high power lasers in the conventional single mode fibers are nonlinear optical effects and fiber end damage [1]. The most direct method to solve these problems is increasing the mode area to reduce optical power density [2]; therefore a new type of gain-guided and index-antiguided (GG-IAG) fiber with large mode area was proposed by Siegman in 2003 [3][4].…”