An ultrashort pulse laser scan device

A technology of ultra-short pulse laser and scanning device, applied in optics, optical components, nonlinear optics, etc., can solve the problems of complicated optical path design, and achieve the effect of improving focusing quality, high transmittance, and facilitating wide-scale popularization and application.

Inactive Publication Date: 2007-05-30
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
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Problems solved by technology

The design of the optical path

Method used

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  • An ultrashort pulse laser scan device
  • An ultrashort pulse laser scan device
  • An ultrashort pulse laser scan device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] Build the test light path as shown in Figure 3. Laser 4 incident laser light (center wavelength 800 nanometers, bandwidth 10 nanometers, initial pulse width 120 femtoseconds) passes through the acousto-optic modulator 1 placed obliquely at 45 degrees, and exits with negative first-order diffracted light. The modulation frequency of the acousto-optic modulator 1 135.7MHz. Since the AOD used in this experiment is sensitive to the polarization state of the incident light, a 1 / 2 wave plate 5 is arranged between the AOM 1 and the two-dimensional AOD. The laser beam passes through the 1 / 2 wave plate 5 and then goes to the two-dimensional acousto-optic deflector with a central operating frequency of 96MHz. The two-dimensional acousto-optic deflectors all use positive first-order diffracted light, the outgoing light hits the light screen 6, and the CCD 7 is used to capture the light spot on the light screen to obtain the result shown in Figure 5(a). The laser beam is not comp...

example 2

[0034] The laser beam after space and time compensation is guided into the microscope objective lens 8 (a 60 times oil lens is used in the experiment, NA=1.24), and the optical path is shown in FIG. 8 . The dichroic mirror 9 is used to reflect the excitation light and transmit the signal light, and the PMT 10 is used for signal detection. Scan the 170nm fluorescent bead sample 11 to get the experimental picture as shown in Fig. 9, and analyze the X and Y axis resolutions, which are measured to be 374 and 385 nanometers respectively, as shown in Fig. 10(a) and 10(b). Using PZT for Z-axis resolution measurement, the minimum Z-axis resolution is 1.1 microns, as shown in Figure 10(c).

[0035]For the AOM 1, its modulation frequency is often higher (for example, to compensate the dispersion of a two-dimensional AOD with a center operating frequency of 96 MHz, the modulation frequency of the AOM 1 needs to be loaded to 135.74 MHz). For near-infrared or infrared lasers, there are so...

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Abstract

The invention discloses an ultrashort pulse laser scanning device. It includes acoustooptic modulator and 2-D acousto-optic deflector which are at the same light path, the 2-D acousto-optic deflector is constructed with two acousto-optic deflectors, the included angle between the acousto-optic deflector and the acoustooptic modulator is 45+-5 degree. The modulating frequency of the acoustooptic modulator is fAOM=f+-10%f, the distance between the acoustooptic modulator and 2-D acousto-optic deflector is D=L+-10%L. When acousto-optic deflector is used to 2-D scan the laser, the device can compensate the spatial dispersion and temporal dispersion introduced by using acousto-optic deflector to scan ultrashort pulse laser beam. The device possesses simple structure, light path is easy to adjust, and it fits for the fields of femtosecond laser storage, imaging and laser micro-processing, specially the random scan of the laser beam.

Description

technical field [0001] The invention belongs to the technical field of laser scanning, and in particular relates to an ultrashort pulse laser scanning device with dispersion compensation function based on a two-dimensional acousto-optic deflector (AOD), which is suitable for femtosecond laser storage, imaging and laser scanning fields of micromachining. Background technique [0002] Using acousto-optic deflectors to scan laser light is a very promising laser scanning technology. It is especially suitable for the fields of femtosecond laser storage, imaging and laser microprocessing. However, when using an acousto-optic deflector to scan an ultrashort pulse laser, the laser beam will produce spatial dispersion and temporal dispersion, which will affect the excitation efficiency of multiphotons. Therefore, spatial and temporal dispersion must be compensated for when ultrashort pulses are scanned using an AOD. [0003] At present, there have been many articles and patents on...

Claims

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Application Information

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IPC IPC(8): G02B26/10G02F1/33G02F1/11
Inventor 骆清铭曾绍群毕昆吕晓华薛松超吴萍
Owner HUAZHONG UNIV OF SCI & TECH
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