Equipment for implementing spectrum shaping using reflection-type electro-optical modulator and shaping method

An electro-optic modulator and spectral shaping technology, applied in the field of laser applications, can solve the problems of phase distortion, laser side effects, and high cost, and achieve the effects of strong shaping ability, great flexibility, and easy adjustment.

Inactive Publication Date: 2005-03-16
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
Birefringent crystals cannot be made very large, and the price of large crystals is also high
③The adjustment method is mechanical, which requires high precision for the incident angle of the laser and lacks flexibility
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 bandwidth and the depth of the central depression; ② high cost, about 3000 yuan to make a narrow-band interference filter; ③ the adjustment method is mechanical, which requires high precision for the incident angle of the laser and lacks flexibility

Method used

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  • Equipment for implementing spectrum shaping using reflection-type electro-optical modulator and shaping method
  • Equipment for implementing spectrum shaping using reflection-type electro-optical modulator and shaping method
  • Equipment for implementing spectrum shaping using reflection-type electro-optical modulator and shaping method

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Experimental program
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Effect test

Embodiment 1

[0032] The incident laser parameters are: center wavelength 800 nm, half width 10 nm. Reflective electro-optic modulator 1 parameters are: the refractive index of prism 11 is 1.784, the metal upper electrode 12 is a silver film, the thickness is 40 nanometers, the dielectric constant is ε=-20+i, the organic polymer waveguide layer 13 adopts alternating current Chain-type organic polymer with a thickness of 1.7 microns, a refractive index of 1.71, and a polarized electro-optic coefficient γ 33 is 27.8pm / V, the isolation layer 14 is PMMA with a thickness of 2 microns and a refractive index of 1.5, the substrate layer 15 is a silver film with a thickness of 100 nanometers and a dielectric constant of ε=-20+i.

[0033] Adjust the polarizer 7 so that the polarization direction is horizontal, corresponding to the TM mode, rotate the turntable 3, and observe the light intensity measured by the photodetector at the same time, so that the light intensity reaches the minimum value, obse...

Embodiment 2

[0036] The incident laser parameters are: center wavelength 800 nm, half width 10 nm. The reflective electro-optic modulator 1 parameters are: the refractive index of the prism 11 is 1.784, the metal upper electrode 12 is a silver film, the thickness is respectively 40, 50 and 60 nanometers, the dielectric constant is ε=-20+i, and the organic polymer conductive The cross-linked organic polymer used in the wave layer 13 has a thickness of 1.7 microns, a refractive index of 1.71, and a polarized electro-optic coefficient γ 33 is 27.8pm / V, the isolation layer 14 is PMMA with a thickness of 2 microns and a refractive index of 1.5, the lower metal electrode 15 is a silver film with a thickness of 100 nanometers and a dielectric constant of ε=-20+i.

[0037] Adjust the polarizer 7 so that the polarization direction is horizontal, corresponding to the TM mode, rotate the turntable 3, and observe the light intensity measured by the photodetector at the same time, so that the light int...

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Abstract

It is a light spectrum shaping apparatus and its method, which uses attenuated total reflectance property and electro-optical property of the reflection electro-optical modulator to realize the light spectrum shaping of ultra-short laser impulse. The apparatus comprises the reflection electro-optical modulator, adjustable direct power, tray disc, laser in the incidence light path, polarimeter, the electro-optical detector in the optics hole and reflection light path and optical spectrometer. The reflection electro-optical modulator composed of the prism and four layers of thin films deposited on the prism is fixed in the center of the rotation disc, The organic polymer wave-guiding layer of the modulator has electro-optical effect through corona discharge electrode. Through altering the incidence angle, it selects the attenuated total reflectance curve with matching width of light spectrum with the laser spectrum from the multiple attenuated total reflectance curves and adjusts the voltage exerted between the upper and down electrodes of the modulator of the adjustable direct power to get the ideal shaping spectrum.

Description

technical field [0001] The invention relates to a device for realizing spectral shaping by using a reflective electro-optical modulator, and a method for shaping the ultrashort laser pulse spectrum by using the attenuated total reflection property of the reflective electro-optic modulator and the electro-optic properties of the polymer, belonging to the laser Field of 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 e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/061
Inventor 刘向民朱鹏飞曹庄琪沈启舜邓晓旭
Owner SHANGHAI JIAO TONG UNIV
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