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Common optical path ultrashort laser pulse beam splitting method and beam splitting device with adjustable pulse interval
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An ultra-short laser, pulse interval technology, applied in optics, optical components, instruments, etc., can solve the problems of many adjustment steps and complex structure, and achieve the effect of simple adjustment
Inactive Publication Date: 2016-08-24
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
However, for multi-pulse (greater than 2) beam splitting, the beam splitting method using the beam splitter has complex structure and many adjustment steps, so it is abandoned
Method used
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Embodiment 1
[0029] Such as figure 2 As shown, the embodiment of the present invention provides a synchronously adjustable pulse interval ultrashort laser pulse beam splitting device, which includes: eleven reflectors, two beam splitters and three precision translation stages, of which eight The mirrors are four mirror pairs respectively forming four delay line structures;
[0030] 1 is the first spectroscopic flat film (BS 1 ), for splitting a single ultrashort laser pulse into two sub-pulses with ultrashort pulse width and pulse interval;
[0031] 2 is the second delay line structure DL 2 : It is located on the reflected light path of the first beam-splitting flat plate, composed of a pair of mirrors, used to turn the light path and adjust the beam-splitting plate BS 1 The pulse delay of the split double pulse;
[0032] 4 is the first component DL of the third delay line structure 3 -1: It is located on the transmitted light path of the first beam splitter, composed of a pair of mi...
Embodiment 2
[0039] figure 1 It is a schematic flow chart of an ultrashort laser pulse beam splitting method with synchronously adjustable pulse interval of the present invention, as shown in figure 1 As shown, the method includes:
[0040] Step 101, pass the ultrashort laser single pulse through the first spectroscopic flat film (BS 1 ) After beam splitting, two sub-pulses with ultra-short pulse width and pulse interval are obtained;
[0041] Specifically, beam splitting is performed through a beam splitter. Further, in addition to the beam splitter, it also includes other commonly used beam splitting devices such as thin film beam splitters.
[0042] Step 102, the two sub-pulses obtained in the first step respectively enter the delay line structure DL 2 (second delay line structure) and delay line structure DL 3 -1 (the first component of the third delay line structure), and then through the second beam splitter (BS 2 ) to split the beam again to obtain four sub-pulses;
[0043] S...
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Abstract
The invention discloses a common optical path ultrashort laser pulse beam splitting method and a beam splitting device with adjustable pulse interval. The device is composed of eleven reflectors, two light-splitting flat plates and three precision translation stages, among which eight reflectors, that is, four reflector pairs form four delay line structures respectively. The beam splitting method includes: adjusting the ultrashort laser single pulse beam splitting into two pulses with ultrashort pulse width and pulse interval; introducing the two pulses into the beam splitter after climbing and folding back to obtain four pulses Output: Integrating two sets of adjustable delay lines in the device onto a translation stage, a one-step adjustment is formed, and the purpose of evenly and synchronously adjusting the pulse interval can be achieved. The system can split a single ultrashort laser pulse into four sub-pulses with synchronously adjustable pulse interval, collinear transmission, equal energy and consistent polarization state.
Description
technical field [0001] The invention relates to the field of ultrashort laser pulse beam splitting, in particular to a beam splitting structure and method for obtaining four femtosecond laser pulses from a single femtosecond laser pulse. Background technique [0002] Femtosecond laser is a kind of laser emitted in the form of pulse, the duration of which is on the order of femtoseconds. Due to the characteristics of high instantaneous power, high targeting accuracy and ultrashort pulse width, femtosecond laser is widely used in the fields of micromachining and ultrafast process detection. Among them, through the study of the ultrafast transient process of femtosecond laser multi-pulse pumping, many important results in the fields of material structure change or energy conversion can be obtained. How to realize the beam splitting and pulse interval of femtosecond laser multi-pulse pumping Regulation is particularly important. [0003] At present, devices for splitting femto...
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