Pulse shaping unit

A technology of pulse shaping and laser pulses, which is applied in laser parts, instruments, optics, etc., can solve the problems that optical modulators cannot realize optical phase continuous modulation, output pulses are not ideal, and limit the application and development of 4F structures.

Inactive Publication Date: 2005-08-31
EAST CHINA NORMAL UNIVERSITY
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Problems solved by technology

[0004] However, if the convex lens used in the prior art works well when the pulse width is large, when the pulse width is very narrow, the output pulse is not ideal due to the chromatic aberration caused by the lens.
In addition, fixed spatial mask optical modulators are generally used in the prior art, but this type of optical modulator c

Method used

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Embodiment Construction

[0014] figure 2 is a pulse shaping device according to an embodiment of the present invention. The device 200 includes a first grating 10, a first concave mirror 22, a light modulator 26, a second concave mirror 22, and the first grating 10, and the first grating 10, the first concave mirror 22, the light modulator 26, the second The distance between the concave mirror 22 and the first grating 10 is the same fixed value, and the fixed value is Wherein, f is the focal length of the concave mirror, and θ is the angle between the incident light and the normal of the concave mirror.

[0015] Wherein, the first grating and the second grating 10 are used to angularly separate or merge laser light of different frequencies, and the first grating and the second grating are the same. In this embodiment, the first grating 10 separates the incident lights of different frequencies in angle, and the second grating combines the separated incident lights and emits them.

[0016] The firs...

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Abstract

The present invention provides a pulse shaping device. It includes two grating, which can be used for separating lasers with different frequencies at an angle or combining them; two concave mirrors, which can be used for making conversion of time domain and frequency domain of laser pulse; and a light modulator, which is positioned in central position of first concave mirror and second concave mirror, and can be used for modulating amplitude or phase of laser pulse; and the distance between every two optical devices is identical fixed value so as to can obtain accurate Fourier transform of reflected light passed through said concave mirrors. Said light modulator is a liquid crystal space light modulator, it can utilize the change of voltage applied to liquid crystal to control arrangement of liquid crystal molecules to change refractivity of medium so as to regulate amplitude and phase of laser pulse.

Description

technical field [0001] The invention relates to a pulse shaping device, in particular to an ultrafast laser pulse shaping device. Background technique [0002] Laser pulse shaping technology is to generate the pulse waveform that people need by controlling the amplitude, phase and frequency of the pulse. At present, a zero-dispersion pulse shaping device with a 4F structure is commonly used in the field of laser pulse shaping technology. figure 1 It is an existing 4F structure zero-dispersion pulse shaping device, which includes a first grating and a second grating 10 , a first convex lens and a second convex lens 12 , and an optical modulator 16 . The first and second gratings are identical, as are the first and second convex lenses. Wherein, the light modulator 16 is located at the center of the first convex lens and the second convex lens 12 . The distance between each optical device is the focal length F of the convex lens, so the devic...

Claims

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Application Information

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IPC IPC(8): G02B27/09G02F1/01H01S3/00
Inventor 孙真荣陈瑜婷张诗按张向韵
Owner EAST CHINA NORMAL UNIVERSITY
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