We demonstrate a compact periodically poled MgO-doped lithium niobate（MgO：PPLN）-based optical parametric oscillator（OPO） quasi-synchronously pumped by a fiber laser system with burst-mode operation.The pump sourc...We demonstrate a compact periodically poled MgO-doped lithium niobate（MgO：PPLN）-based optical parametric oscillator（OPO） quasi-synchronously pumped by a fiber laser system with burst-mode operation.The pump source is a peak-power-selectable pulse-multiplied picosecond Yb fiber laser.The chirped pulses from a figure of eight-cavity modelocked fiber laser seed are narrowed to a duration of less than 50 ps using an FBG reflector and a circulator.The narrowed pulses are directed to pass through a pulse multiplier and to form pulse bunches,each of which is composed of 13 subpulses.The obtained pulse bunches are amplified by two-stage fiber pre-amplifiers：one-stage is core-pumped and the other is cladding-pumped.A fiberized acousto-optic modulator is inserted to control the pulse repetition rate（PRR） of the pulse bunches before they are power-amplified in the final amplifier stage with a large mode area（LMA） PM Yb-doped fiber.The maximum average powers from the final amplifier are 85 W,60 W,and 45 W,respectively,corresponding to the PRR of2.72 MHz,1.36 MHz,and 0.68 MHz.The amplified pulses are directed to pump an MgO：PPLN-based optical parametric oscillator（OPO）.A maximum peak power at 3.45 μm is obtained approximately to be 8.4 kW.Detailed performance characteristics are presented.展开更多
In the face of higher education is full of vigor and vitality,active thinking of student groups, they have a strong thirst for knowledge, and actively explore new problems, and strongly expressed their own views of th...In the face of higher education is full of vigor and vitality,active thinking of student groups, they have a strong thirst for knowledge, and actively explore new problems, and strongly expressed their own views of the desire. For independent design, to explore freely have strong desires and expectations.This requires that teachers could apply the proper teaching methods in class, maximum limit to encourage students’ active exploration, active thinking。展开更多
1. Establish a flexible entry and exit mechanism for the students and the enterprises.Implementation of Excellence program is a long term project for companies and students, which would meet a lot of variables.From th...1. Establish a flexible entry and exit mechanism for the students and the enterprises.Implementation of Excellence program is a long term project for companies and students, which would meet a lot of variables.From the business perspective, it is the economic organization to make profits for the purpose.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.61078015)the National Basic Research Program of China(Grant No.2011CB311803)
文摘We demonstrate a compact periodically poled MgO-doped lithium niobate（MgO：PPLN）-based optical parametric oscillator（OPO） quasi-synchronously pumped by a fiber laser system with burst-mode operation.The pump source is a peak-power-selectable pulse-multiplied picosecond Yb fiber laser.The chirped pulses from a figure of eight-cavity modelocked fiber laser seed are narrowed to a duration of less than 50 ps using an FBG reflector and a circulator.The narrowed pulses are directed to pass through a pulse multiplier and to form pulse bunches,each of which is composed of 13 subpulses.The obtained pulse bunches are amplified by two-stage fiber pre-amplifiers：one-stage is core-pumped and the other is cladding-pumped.A fiberized acousto-optic modulator is inserted to control the pulse repetition rate（PRR） of the pulse bunches before they are power-amplified in the final amplifier stage with a large mode area（LMA） PM Yb-doped fiber.The maximum average powers from the final amplifier are 85 W,60 W,and 45 W,respectively,corresponding to the PRR of2.72 MHz,1.36 MHz,and 0.68 MHz.The amplified pulses are directed to pump an MgO：PPLN-based optical parametric oscillator（OPO）.A maximum peak power at 3.45 μm is obtained approximately to be 8.4 kW.Detailed performance characteristics are presented.
文摘In the face of higher education is full of vigor and vitality,active thinking of student groups, they have a strong thirst for knowledge, and actively explore new problems, and strongly expressed their own views of the desire. For independent design, to explore freely have strong desires and expectations.This requires that teachers could apply the proper teaching methods in class, maximum limit to encourage students’ active exploration, active thinking。
文摘1. Establish a flexible entry and exit mechanism for the students and the enterprises.Implementation of Excellence program is a long term project for companies and students, which would meet a lot of variables.From the business perspective, it is the economic organization to make profits for the purpose.
