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Device and method for writing gratings on lithium niobate waveguides by aid of femtosecond laser device

A technology of femtosecond lasers and waveguide gratings, applied in the field of femtosecond lasers and waveguide gratings, can solve the problems of low precision, fixed grating period, inflexible adjustment, etc., and achieve high precision, flexible and variable structure, and wide application foreground effect

Inactive Publication Date: 2014-12-10
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for writing a grating on a lithium niobate waveguide using a femtosecond laser, which solves the shortcomings of the grating period fixed, inflexible and adjustable, and low precision in the common grating writing method

Method used

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  • Device and method for writing gratings on lithium niobate waveguides by aid of femtosecond laser device
  • Device and method for writing gratings on lithium niobate waveguides by aid of femtosecond laser device
  • Device and method for writing gratings on lithium niobate waveguides by aid of femtosecond laser device

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Embodiment 1

[0034] A device for writing a grating on a lithium niobate waveguide using a femtosecond laser, the structure diagram is as follows figure 1 As shown, the device includes a femtosecond laser 1 , a collimation system 2 , and an attenuation system 3 , a shutter 4 , a filtering system 5 , a focusing system 6 and a displacement platform system 7 arranged in sequence along the optical path.

[0035] The collimation system includes two mirrors and two adjustable diaphragms, and the connection sequence is mirror-reflector-adjustable diaphragm-adjustable diaphragm;

[0036] The attenuation system includes a Glan Taylor prism, a half-wavelength plate, and a set of neutral density filters, and the connection sequence is a half-wavelength plate-Glan Taylor prism-neutral density filter;

[0037] The filter system includes an objective lens, a pinhole and a lens, and the connection sequence is objective lens-pinhole-lens;

[0038] The displacement platform system is composed of a precisio...

Embodiment 2

[0044] A device for writing a grating on a lithium niobate waveguide using a femtosecond laser, with a structure such as figure 1 Shown, with embodiment 1.

[0045] Method steps for writing a grating on a lithium niobate waveguide:

[0046] The femtosecond laser is used as the light source to output a certain power of light pulses. After the attenuation system is attenuated, the number of pulses passed by the shutter is controlled, and then the beam filtered by the filter system is focused by the focusing system and irradiated on the displacement platform equipped with lithium niobate waveguide. above. The lithium niobate waveguide sample used is X-cut, the size is 13.5mm*9mm*0.5mm, the width of the waveguide is 8um; the wavelength of the femtosecond laser is 780nm, the repetition frequency is 80MHZ, the output power is 1.91W, and the pulse width is 80fs; filtering The system uses a 20x objective lens, a 3um pinhole, and f50, φ30 double cemented achromatic lenses. We use a ...

Embodiment 3

[0049] A device for writing a grating on a lithium niobate waveguide using a femtosecond laser, with a structure such as image 3 Shown, with embodiment 1.

[0050] Method steps for writing a grating on a lithium niobate waveguide:

[0051] The femtosecond laser is used as the light source to output a certain power of light pulses. After the attenuation of the attenuation system, the number of pulses passed by the shutter is controlled, and then the beam filtered by the filter system is focused by the focusing system and irradiated on the displacement platform equipped with lithium niobate waveguide. above. The lithium niobate waveguide sample used is X-cut, the size is 13.5mm*9mm*0.5mm, the width of the waveguide is 8um; the wavelength of the femtosecond laser is 780nm, the repetition frequency is 80MHZ, the output power is 1.91W, and the pulse width is 80fs; filtering The system uses a 20x objective lens, a 3um pinhole, and f50, φ30 double cemented achromatic lenses. We u...

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Abstract

The invention discloses a device and a method for writing gratings on lithium niobate waveguides by the aid of a femtosecond laser device. The device comprises the femtosecond laser device, a collimation system, an attenuation system, a shutter, a filter system, a focus system and a displacement platform system. The attenuation system, the shutter, the filter system, the focus system and the displacement platform system are sequentially arranged along a light path. The method includes that nonlinear absorption performance of the lithium niobate waveguides can be enhanced if the density of power outputted by the femtosecond laser device is higher than damage thresholds of the lithium niobate waveguides, the structures of materials can be changed, a refractive index can be periodically modulated, and accordingly effects of writing the gratings can be realized. The device and the method have the advantages that the device is simple and flexible in structure, the manufactured gratings are high in precision, the periods of the gratings can be correspondingly adjusted as needed, and the device and the method are favorable for popularization and application.

Description

technical field [0001] The invention belongs to the field of femtosecond lasers and waveguide gratings, in particular to a method for writing gratings on lithium niobate waveguides using femtosecond lasers. Background technique [0002] At present, common grating writing methods mainly include mask method, interferometer method, etc. The grating period written by these methods is fixed, not flexible and adjustable, and the grating accuracy is relatively low. [0003] In recent years, with the development of femtosecond laser micro-nano precision machining, the use of femtosecond laser ablation and modification of LiNbO 3 Crystal fabrication of optoelectronic devices has become a research hotspot. Femtosecond laser has the advantages of small thermal area and high processing precision in the process of material processing, so it has become a new tool for material processing. People have widely used femtosecond laser to make optical waveguides, optical coupling devices, and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/122G02B6/124G02B6/13
Inventor 张爱玲何培栋
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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