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High-power GHz repetition frequency femtosecond laser generation system

A femtosecond laser, repetition rate technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problem of limiting the application range of average output power, and achieve the effect of compensating dispersion and improving output power

Active Publication Date: 2021-05-28
XIDIAN UNIV
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Problems solved by technology

[0005] Through the above analysis, the existing problems and defects of the existing technology are: the current Kerr lens mode-locked femtosecond laser with GHz repetition rate can only be pumped by single-mode fiber-coupled LD with good beam quality, which greatly limits the average output Power and subsequent application range

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  • High-power GHz repetition frequency femtosecond laser generation system
  • High-power GHz repetition frequency femtosecond laser generation system
  • High-power GHz repetition frequency femtosecond laser generation system

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specific Embodiment

[0062] exist figure 1 In the ring cavity, after the self-excited oscillation is formed, the laser light in the cavity exists in the clockwise and counterclockwise directions at the same time, and the fourth concave mirror 8 outputs two laser beams at the same time. The specific circulation path is as follows: the 981nm pump laser generated by the multimode fiber-coupled 981nm laser diode 1 passes through the collimation and focusing system 2, and then the pump beam passes through the first concave mirror 3 to form a pump with a diameter of about 103 μm in the center of the Yb:KGW crystal. Pu focuses the light spot and excites the fluorescence; the fluorescence sequentially reaches the second concave mirror 5, reflects to the Kerr medium 6, reaches the third concave mirror 7, is reflected to the fourth concave mirror 8, and is reflected to the Yb:KGW crystal 4 , complete a counterclockwise cycle. Simultaneously, after the Yb:KGW crystal 4 excites the fluorescence, it will also...

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Abstract

The invention belongs to the technical field of all-solid-state ultrafast laser, and discloses a high-power GHz repetition frequency femtosecond laser generation system, which comprises: a 981 nm laser diode coupled by a multimode optical fiber, wherein the 981 nm laser diode is used as a pumping source; a collimation focusing system used for focusing pumping laser to the center of a laser crystal to form a pumping focusing light spot; a first concave mirror used for reflection; a Yb:KGW crystal vertically cut and placed in an annular cavity; a second concave mirror used for reflection; a Kerr medium for providing an additional Kerr effect; a third concave mirror used for providing second-order dispersion and compensating intracavity dispersion; and a fourth concave mirror used for outputting a high-power mode-locked femtosecond laser pulse. By reasonably designing the resonant cavity structure and utilizing the Kerr lens mode locking technology and the dispersion compensation technology, high-power GHz repetition frequency femtosecond laser pulses which are excellent in performance, compact in structure, stable in work and low in price can be generated.

Description

technical field [0001] The invention belongs to the technical field of all-solid-state ultrafast lasers, and in particular relates to a femtosecond laser generation system with high power and GHz repetition rate. Background technique [0002] Currently: GHz repetition rate mode-locked femtosecond lasers can be used in femtosecond optical frequency combs, high-speed optical information transmission, high-speed optical sampling, laser spectroscopy and other fields, especially in the field of optical frequency combs, GHz femtosecond lasers have important applications value. Because of its high repetition rate, when used in an optical frequency comb, the comb tooth spacing is larger, and when used for unknown frequency detection, the accuracy is higher; at the same time, in the same frequency range, the comb tooth density is smaller, so in Under the same average power, each comb tooth can obtain higher average power, which helps to obtain a signal with a higher signal-to-noise ...

Claims

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Application Information

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IPC IPC(8): H01S3/083H01S3/094H01S3/0941H01S3/16
CPCH01S3/0941H01S3/094069H01S3/083H01S3/1675
Inventor 田文龙郑立朱江峰张大成魏志义
Owner XIDIAN UNIV
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