公开(公告)号：US07839901B2

公开(公告)日：2010-11-23

申请号：US12315437

申请日：2008-12-03

申请人： Mikhail Meleshkevich ,  Victor Ilyashenko ,  Oleg Shkurikhin

发明人： Mikhail Meleshkevich ,  Victor Ilyashenko ,  Oleg Shkurikhin

IPC分类号： H01S3/30

CPC分类号： G02B6/03616 ,  G02B6/03627 ,  G02B6/03633 ,  G02B6/14 ,  H01S3/06708 ,  H01S3/06754 ,  H01S3/094007 ,  H01S3/094042 ,  H01S3/094053 ,  H01S3/09408 ,  H01S3/09415 ,  H01S3/1616

摘要： A powerful fiber laser system is configured with at least one gain block. The gain block includes an input fiber guiding a pump light, a multiclad active fiber receiving the pump light so that a major portion is absorbed in the core of the active fiber while a minor portion of the pump light propagates in the inner cladding of the active fiber, and a multiclad output fiber. The multiclad output fiber is configured with a core, guiding a signal lased by the core of the active fiber upon absorption of the major portion of the pump light, an inner cladding receiving the minor portion of the pump light and an outer cladding. The inner and outer claddings of the multiclad output fiber have respective refractive indexes which are selected so that the refractive index of the outer cladding is higher than that one of the inner cladding. The configuration of the output fiber allows for the removal of substantially the entire light from the inner cladding of the output fiber before the signal is emitted through the downstream end of the output fiber.

公开(公告)号：US08654800B2

公开(公告)日：2014-02-18

申请号：US13099499

申请日：2011-05-03

申请人： Roman Yagodkin ,  Nikolai Platanov ,  Mikhail Meleshkevich

发明人： Roman Yagodkin ,  Nikolai Platanov ,  Mikhail Meleshkevich

IPC分类号： H01S3/07

CPC分类号： H01S3/08045 ,  H01S3/0675 ,  H01S3/0804 ,  H01S3/131 ,  H01S3/139

摘要： A high power fiber laser is configured with a multimode active fiber and input and output single mode passive fibers butt-spliced to respective opposite ends of the active fiber. If the input passive and active fibers do not have substantially matched diameters, a SM radiation coupled into the active fiber may excite fundamental and high order modes which, while interfering with one another, create a non-uniform distribution of refractive index in each of forward and backward light propagation directions along the resonator of the laser. The variable longitudinal perturbation components of the refractive index in respective forward and backward directions along an optical path in the active fiber are distributed in accordance with respective cosine functions. The length of the optical path is set so that the cosine functions of the respective perturbation components are shifted in a counter-phase position in which a cross-coupling coefficient between fundamental and high-order modes is substantially minimized. The optimal length of the optical path is maintained by controlling by either an ambient temperature or an electric field of piezo-element coupled to the MM active fiber. As a consequence, the disclosed high power fiber laser emits radiation in a fundamental mode having minimum power losses.

摘要翻译： 高功率光纤激光器配置有多模有源光纤，并将输入和输出单模无源光纤对接到有源光纤的相对端。 如果输入的无源和有源光纤不具有基本匹配的直径，则耦合到有源光纤中的SM辐射可以激发基本和高阶模式，其在相互干扰的同时在每个前向中产生不均匀的折射率分布 以及沿着激光器的谐振器的向后的光传播方向。 沿着有源光纤中的光路的相应的前后方向的折射率的可变纵向扰动分量根据相应的余弦函数分布。 光路的长度被设定为使得各个扰动分量的余弦函数在基本和高阶模之间的交叉耦合系数基本上最小化的相对位置中移位。 通过环境温度或耦合到MM有源光纤的压电元件的电场进行控制来维持光路的最佳长度。 因此，所公开的高功率光纤激光器以具有最小功率损耗的基本模式发射辐射。

公开(公告)号：US20120281719A1

公开(公告)日：2012-11-08

申请号：US13099499

申请日：2011-05-03

申请人： Roman Yagodkin ,  Nikolai Plaonov ,  Mikhail Meleshkevich

发明人： Roman Yagodkin ,  Nikolai Plaonov ,  Mikhail Meleshkevich

IPC分类号： H01S3/30

CPC分类号： H01S3/08045 ,  H01S3/0675 ,  H01S3/0804 ,  H01S3/131 ,  H01S3/139

摘要： A high power fiber laser is configured with a multimode active fiber and input and output single mode passive fibers butt-spliced to respective opposite ends of the active fiber. If the input passive and active fibers do not have substantially matched diameters, a SM radiation coupled into the active fiber may excite fundamental and high order modes which, while interfering with one another, create a non-uniform distribution of refractive index in each of forward and backward light propagation directions along the resonator of the laser. The variable longitudinal perturbation components of the refractive index in respective forward and backward directions along an optical path in the active fiber are distributed in accordance with respective cosine functions. The length of the optical path is set so that the cosine functions of the respective perturbation components are shifted in a counter-phase position in which a cross-coupling coefficient between fundamental and high-order modes is substantially minimized. The optimal length of the optical path is maintained by controlling by either an ambient temperature or an electric field of piezo-element coupled to the MM active fiber. As a consequence, the disclosed high power fiber laser emits radiation in a fundamental mode having minimum power losses.

摘要翻译： 高功率光纤激光器配置有多模有源光纤，并将输入和输出单模无源光纤对接到有源光纤的相对端。 如果输入的无源和有源光纤不具有基本上匹配的直径，则耦合到有源光纤中的SM辐射可以激发基本和高阶模式，其在相互干扰的同时在每个前向中产生不均匀的折射率分布 以及沿着激光器的谐振器的向后的光传播方向。 沿着有源光纤中的光路的相应的前后方向的折射率的可变纵向扰动分量根据相应的余弦函数分布。 光路的长度被设定为使得各个扰动分量的余弦函数在基本和高阶模之间的交叉耦合系数基本上最小化的相对位置中移位。 通过环境温度或耦合到MM有源光纤的压电元件的电场进行控制来维持光路的最佳长度。 因此，所公开的高功率光纤激光器以具有最小功率损耗的基本模式发射辐射。

公开(公告)号：US20100135339A1

公开(公告)日：2010-06-03

申请号：US12315437

申请日：2008-12-03

申请人： Mikhail Meleshkevich ,  Victor Ilyashenko ,  Oleg Shkurikhin

发明人： Mikhail Meleshkevich ,  Victor Ilyashenko ,  Oleg Shkurikhin

IPC分类号： H01S3/30 ,  G02B6/036 ,  G02B6/028

CPC分类号： G02B6/03616 ,  G02B6/03627 ,  G02B6/03633 ,  G02B6/14 ,  H01S3/06708 ,  H01S3/06754 ,  H01S3/094007 ,  H01S3/094042 ,  H01S3/094053 ,  H01S3/09408 ,  H01S3/09415 ,  H01S3/1616

摘要： A powerful fiber laser system is configured with at least one gain block. The gain block includes an input fiber guiding a pump light, a multiclad active fiber receiving the pump light so that a major portion is absorbed in the core of the active fiber while a minor portion of the pump light propagates in the inner cladding of the active fiber, and a multiclad output fiber. The multiclad output fiber is configured with a core, guiding a signal lased by the core of the active fiber upon absorption of the major portion of the pump light, an inner cladding receiving the minor portion of the pump light and an outer cladding. The inner and outer claddings of the multiclad output fiber have respective refractive indexes which are selected so that the refractive index of the outer cladding is higher than that one of the inner cladding. The configuration of the output fiber allows for the removal of substantially the entire light from the inner cladding of the output fiber before the signal is emitted through the downstream end of the output fiber.

摘要翻译： 强大的光纤激光系统配置有至少一个增益块。 增益块包括引导泵浦光的输入光纤，接收泵浦光的多载波有源光纤，使得主要部分被吸收在有源光纤的芯中，而较小部分的泵浦光在活性物质的内包层中传播 光纤和多芯输出光纤。 多芯输​​出光纤配置有芯，在吸收泵浦光的主要部分时引导由有源光纤的芯发出的信号，接收泵浦光的小部分的外包层和外包层。 多芯输​​出光纤的内包层和外包层具有相应的折射率，其选择为使得外包层的折射率高于内包层的折射率。 在信号通过输出光纤的下游端发射之前，输出光纤的配置允许从输出光纤的内包层去除基本上整个的光。