Femto second compression device

A compression device and femtosecond pulse technology, which is applied in the field of femtosecond laser pulses, can solve the problems of inability to guarantee the high efficiency of -1 order diffraction order, the limitation of beam aperture, and the small distance of high-density gratings, etc., so as to achieve easy fabrication, Improved efficiency and compact structure

Active Publication Date: 2008-05-28
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

Due to the relatively small dispersion of materials in the femtosecond laser resonator, the distance between high-density grating pairs will be very small, and the aperture of the beam is limited, which makes the reflective grating structure very technically difficult in practical applications.
The use of a transmissive grating structure will make the problem easier to solve
However, if a transmission holographic grating is used, firstly, the high efficiency of the -1 order diffraction order cannot be guaranteed, and secondly, a good quality transmission

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Embodiment Construction

[0024] The device of the present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0025] Referring first to FIG. 1 , it can be seen from the figure that the device for realizing femtosecond pulse compression using a subwavelength deeply etched transmission grating in the present invention includes a first grating 1 and a second grating 2 . The two gratings are sub-wavelength deeply etched transmission gratings, and the linear density of the two gratings is equal. The two gratings are placed in parallel, and the side with the grating stripes is located inside the pair of gratings. Moving the second grating 2 to adjust the distance between the two gratings can satisfy the compression of femtosecond pulses with different amounts of dispersion.

[0026] The femtosecond pulse to be compressed is incident on the first grating 1 at the Bragg angle, and satisfies the grating equation:

[0027] sin θ ...

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Abstract

A femtosecond pulse compression device comprises a first grating and a second grating which are arranged in parallel, one surfaces of the two gratings which are provided with grating fringes are arranged on the inner side of the gratings, and the first grating and the second grating with the same structure are all sub-wavelength deep etching transmission gratings whose periodic times are d, the second grating is arranged on the second direction of the diffraction order of the transmission negative first order of the first grating, femtosecond laser pulse which needs to be compressed is incident to the first grating in a Bragg angle theta and meet the grating equation, sin theta= lambda0 / 2d, wherein theta is an incident angle, lambda0 is a center wavelength of the femtosecond laser pulse. The invention utilizes the sub-wavelength deep etching transmission gratings to constitute the femtosecond pulse compression device which has the advantages of compact structure and high efficiency.

Description

technical field [0001] The invention relates to a femtosecond laser pulse, in particular to a femtosecond pulse compression device composed of a high-efficiency sub-wavelength deep-etching transmission grating. technical background [0002] Femtosecond laser pulses have the advantages of high peak power and short duration, so they have a wide range of applications in physics, biology, chemistry, and microfabrication and microprocessing. [0003] Usually, the laser pulse generated in the femtosecond resonator has a positive chirp due to the dispersion of materials such as the gain medium in the cavity. In order to compensate the effect of material dispersion and achieve the purpose of compressing the pulse, negative dispersion elements are generally inserted inside and outside the cavity. At present, the prism pair is the most widely used dispersion compensation element, which has the advantage of low energy loss, but because the angular dispersion of the prism is relatively...

Claims

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Application Information

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IPC IPC(8): G02F1/35H01S3/00
Inventor 周常河贾伟
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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