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Apparatus and method for calibrating spectrum by prism/waveguide coupling unit

A coupling unit and spectral shaping technology, applied in the field of laser applications, can solve the problems of phase distortion, high cost, laser side effects, etc., and achieve the effects of strong shaping ability, easy production and simple operation

Inactive Publication Date: 2005-02-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has certain defects: ①The birefringent crystal is a transparent element, which will have side effects on the laser passing through it, such as causing Fabry-Perot effect, phase distortion, etc.; ②The thickness of the birefringent crystal depends on Depending on the spectral width of the laser pulse to be shaped, the narrower the spectrum of the laser pulse, the thicker the birefringent crystal is required to match the width of the transmittance curve of the birefringent crystal with the spectral width of the laser pulse
There are some problems in this method: ①The precision of the coating is high, and the current domestic coating technology is difficult to achieve the desired effect, especially for narrow-band (a dozen nanometers) interference filters, the transmittance curve cannot be well controlled The bandwidth and the depth of the center depression; ②Once the interference filter is coated, its transmittance curve cannot be changed, and it lacks flexibility
③High cost

Method used

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  • Apparatus and method for calibrating spectrum by prism/waveguide coupling unit
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  • Apparatus and method for calibrating spectrum by prism/waveguide coupling unit

Examples

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Effect test

Embodiment 1

[0031]The incident laser parameters are: center wavelength 800 nm, half width 10 nm. The parameters of the prism / waveguide coupling unit are: the refractive index of the prism 10 is 1.784, the cover layer 11 is a silver film, the thickness is 40 nanometers, the dielectric constant is ε=-20+i, and the waveguide layer 12 adopts a cross-linked organic polymer , with a thickness of 1.7 microns and a refractive index of 1.71. The isolation layer 13 is PMMA with a thickness of 2 microns and a refractive index of 1.5. The substrate layer 14 is a silver film with a thickness of 100 nanometers and a dielectric constant of ε=-20+i.

[0032] Adjust the polarizer 6 so that the polarization direction is horizontal, corresponding to the TM mode, rotate the turntable 2, and observe the light intensity measured by the photodetector at the same time, so that the light intensity reaches the minimum value, observe the reshaped spectrum on the spectrometer, and continue to fine-tune the incident a...

Embodiment 2

[0035] The incident laser parameters are: center wavelength 1310 nm, half width 10 nm. The parameters of the prism / waveguide coupling unit are: the refractive index of the prism 10 is 1.784, the cover layer 11 is a silver film, the thickness is 40 nanometers, the dielectric constant is ε=-54+4i, and the cross-linked organic polymer used in the waveguide layer 12 Thickness is 1.7 micron, and refractive index is 1.71, and isolation layer 13 is PMMA, and thickness is 2 micron, and refractive index is 1.5, and substrate layer 14 is silver film, and thickness is 100 nanometers, and dielectric constant is ε=-54+4i .

[0036] Adjust the polarizer 6 so that the polarization direction is horizontal, corresponding to the TM mode, rotate the turntable 2, and observe the light intensity measured by the photodetector at the same time, so that the light intensity reaches the minimum value, then observe the reshaped spectrum on the spectrometer, and continue to fine-tune the incident angle. ...

Embodiment 3

[0039] The incident laser parameters are: center wavelength 800 nm, half width 10 nm. The parameters of the prism / waveguide coupling unit are: the refractive index of the prism 10 is 1.784, the cover layer 11 is a silver film, the thickness is respectively 40, 50 and 60 nanometers, the dielectric constant is ε=-20+i, and the waveguide layer 12 adopts Cross-linked organic polymer with a thickness of 1.7 microns and a refractive index of 1.71. The isolation layer 13 is PMMA with a thickness of 2 microns and a refractive index of 1.5. The substrate layer 14 is a silver film with a thickness of 100 nanometers and a dielectric constant of ε =-20+i.

[0040] Adjust the polarizer 6 so that the polarization direction is horizontal, corresponding to the TM mode, rotate the turntable 2, and observe the light intensity measured by the photodetector at the same time, so that the light intensity reaches the minimum value, then observe the reshaped spectrum on the spectrometer, and continue...

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Abstract

A reshaping method includes fixing prism / waveguide coupling unit formed by prism and four deposited film layers at centre of rotation disc, having its attenuation total reflection curve width match to specrum width of incoming laser pulse, selecting attenuation total reflection curve to match laser spectrum width by varying incoming angle, making fine regulation to incoming angle for obtaining ideal shaped spectrum. A device for realizing the method is also disclosed.

Description

technical field [0001] The invention relates to a device for realizing spectrum shaping by using a prism / waveguide coupling unit and a method for shaping ultrashort laser pulse spectrum by using the attenuated total reflection property of the prism / waveguide coupling unit, which belongs to the field of laser application technology. Background technique [0002] In the ultra-short and ultra-intense laser technology, many factors limit the further improvement of the output power of the laser system. Among them, the gain-narrowing effect of solid-state laser amplifying medium is a difficult problem. Due to the limited bandwidth of the solid-state laser amplifying medium, the center gain of the laser pulse is high and the edge gain is low. As the laser pulse is amplified step by step, the spectrum of the laser pulse will become narrower and narrower, which is the so-called gain-narrowing effect. The gain-narrowing effect prevents the laser pulse from making full use of the gai...

Claims

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Application Information

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IPC IPC(8): G02B6/10G02F1/00G02F1/35H01S3/00
Inventor 朱鹏飞刘向民曹庄琪沈启舜邓晓旭
Owner SHANGHAI JIAO TONG UNIV
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