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Femtosecond laser frequency multiplier based on multi-component doped layered crystal

A femtosecond laser, layered crystal technology, applied in lasers, laser parts, phonon exciters, etc., can solve problems such as bandwidth limit limitation, and achieve the effect of wide theoretical bandwidth, good practicability, and reduced requirements

Inactive Publication Date: 2006-07-12
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(Heyuan Zhu, Tao Wang, Wanguo Zheng, et al. "Efficient second harmonic generation of femtosecond laser at 1μm" Optics Express vol.12, no.10; 17 May 2004) This type of technology has a high Practical, but its theoretical bandwidth limit is still limited by crystal dispersion (GVD)

Method used

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  • Femtosecond laser frequency multiplier based on multi-component doped layered crystal
  • Femtosecond laser frequency multiplier based on multi-component doped layered crystal
  • Femtosecond laser frequency multiplier based on multi-component doped layered crystal

Examples

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Embodiment 1

[0038] Design KDP and KD * P-doped crystal realizes broadband frequency doubling around 1054nm.

[0039] (1) The fundamental frequency pulse shape is Gaussian, the center wavelength is 1054nm, the pulse width is 20fs, and its corresponding spectral half-maximum width is 80nm. We design KDP and KD * P-doped multilayer crystal to achieve its broadband frequency doubling. Considering technical factors and cost, the design crystal length is 20mm, the number of layers is 20, and the cutting angle is 41 degrees. In order to achieve effective frequency doubling of each frequency component, we hope that the phase matching wavelength covers the spectral range twice the half-width of the fundamental frequency light, that is, 0.974um-1.134um. From figure 2 We can see that the doping concentration x needs to be chosen to vary from 80% to 88% in the crystal. The interlayer doping concentration change function adopts a linear function. Through these optimized designs, simple and reli...

Embodiment 2

[0043] Design other doped crystals to achieve broadband frequency doubling near 1054nm.

[0044] (1) ADP and AD * In the case of P doping, the fundamental frequency pulse shape is Gaussian, the center wavelength is 1054nm, the pulse width is 20fs, and the corresponding spectral half-maximum width is 80nm. Compared with the first part of Example 1, the design crystal length is 20 mm, the number of layers is 20, and the cutting angle is 40.6 degrees. Such as image 3 , choose the doping concentration x 1 The variation in crystals ranged from 62% to 69%. The interlayer doping concentration change function adopts a linear function. The effect of broadband frequency doubling can also be achieved.

[0045] (2) Under the same fundamental frequency pulse condition as in the first part of Example 2, to achieve the purpose of broadband frequency doubling, if KDA / KDP doped crystals are used, the design crystal length is 20mm, the number of layers is 20 layers, and the cutting angle ...

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Abstract

The invention relates to a femtosecond laser frequency multiplier based on multiple chemical components and variable-doping multilayer nonlinear optical crystal. Wherein, the doping concentration varies along light direction and among layers. This invention is reliable and simple for usage, and allows super broad band.

Description

technical field [0001] The invention belongs to the technical field of laser frequency doubling, and in particular relates to an ultra-broadband femtosecond laser frequency multiplier based on layered nonlinear optical crystals doped with multiple chemical components. Background technique [0002] Ultra-broadband femtosecond pulses are widely used in strong field physics, laser nuclear fusion, ultrafast measurement and many other aspects. Femtosecond technology with Ti:Sapphire laser as a typical carrier is becoming more and more mature, and the emergence of its commercial devices has greatly promoted the development of ultrafast technology itself. As an effective frequency conversion technology, frequency doubling technology has important applications in the field of femtosecond optics. However, for general frequency doubling crystals, the ultra-broadband femtosecond light spectrum components far away from the center frequency will not be able to obtain effective frequency...

Claims

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Application Information

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IPC IPC(8): H01S3/109
Inventor 钱列加袁鹏罗航朱鹤元范滇元
Owner FUDAN UNIV
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