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Acoustooptic modulator used for femtosecond laser

A technology of acousto-optic modulator and acousto-optic deflector, applied in instrumentation, optics, nonlinear optics, etc., can solve problems such as spatial and temporal dispersion

Inactive Publication Date: 2007-05-23
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acousto-optic modulators have become more and more widely used in laser light intensity modulation in recent years, but they are mainly used in the field of continuous light. If they are used in femtosecond lasers, they will cause serious spatial and temporal dispersion.

Method used

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  • Acoustooptic modulator used for femtosecond laser
  • Acoustooptic modulator used for femtosecond laser
  • Acoustooptic modulator used for femtosecond laser

Examples

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example 1

[0049] As shown in Figure 11, the collimated laser light (800nm) emitted from the laser device 7 passes through the first and second acousto-optic deflectors 5 and 6 with a working frequency of 96 MHz and hits the white screen 9, and is observed and recorded by the CCD 8. Lower the position, change the wavelength of the laser (710nm), at this time the laser cannot pass through the system, there is no light point on the white screen 9, change the operating frequency of the two acousto-optic deflectors to 108.2MHz, and use the CCD8 to observe that the laser hits the white screen again 9 in the same position. Change the wavelength of the laser 7 to 990nm. At this time, there is no light point on the white screen. Change the operating frequency of the two acousto-optic deflectors to 77.6MHz. Observe that the laser still hits the same position on the white screen 9 with the CCD 8 . Changing the power of any one or both of these two acousto-optic deflectors can realize the modulatio...

example 2

[0051] According to the principle schematic diagram shown in Figure 13, a beam of femtosecond laser (800nm) with a pulse width of 141fs (as shown in Figure 14a) passes through the first acousto-optic deflector 5, at this time the frequency of the acousto-optic deflector is set to 96MHz, at this time The femtosecond laser is broadened to 345fs (as shown in Figure 14b), and has spatial dispersion. When the femtosecond laser travels a distance L between the two acousto-optic deflectors, the time dispersion is overcompensated, and the overcompensation amount can just offset the first Time dispersion brought by two AODs 6. After the femtosecond laser passes through the second acousto-optic deflector 6, its spatial dispersion is also fully compensated, and the outgoing light has no temporal dispersion, and its pulse width is still 141 fs (as shown in Figure 14c). Use 141fs after complete dispersion compensation and 345fs without dispersion compensation with the same power laser (2mW...

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PUM

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Abstract

The invention discloses a femtosecond pulse acousto-optic modulator, including two acousto-optic deflectors. The two acousto-optic deflector reverse placed parallel and equal sound waves frequency. The two acousto-optic deflector spaces L +- 10% L, and L value met requirement of (I). In (me), v and f respectively stands for acousto-optic deflector sonic speed and frequency, GDDm stands for the material dispersion of acousto-optic deflector, lambada stands for laser wavelength. The invention of the acousto-optic deflector on different wavelengths of laser intensity modulation, can achieve common axis modulation, also compensated acousto-optic crystal of ultra-short pulses in time and space dispersion. The invention structure is flexible and easy modulation, applied to multi-photon scanning, imaging and laser micro-processing and other fields.

Description

technical field [0001] The invention belongs to femtosecond laser modulation technology, in particular to an acousto-optic modulator (AOM) for femtosecond laser, which is especially suitable for multi-photon laser scanning measurement, imaging, laser microprocessing and other fields. Background technique [0002] The rapid modulation of laser power by using an acousto-optic modulator is a very widely used technology, especially in laser measurement, imaging and microprocessing. And the acousto-optic modulator has a large market at home and abroad. However, these acousto-optic modulators are aimed at continuous light sources and cannot be applied to ultrashort pulse lasers. Ultrashort pulses with high instantaneous peak power and high tomographic capabilities have very important applications in the fields of laser imaging and micromachining, and have become a hot spot of application and research at home and abroad in recent years. [0003] In U.S. Patent No. 6,804,000B2, a ...

Claims

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Application Information

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IPC IPC(8): G02F1/11G02F1/01
Inventor 毕昆曾绍群骆清铭李德荣
Owner HUAZHONG UNIV OF SCI & TECH
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