Laser pulse width and waveform control method based on step-type opening of Q-switch
A laser pulse and stepped technology, applied in the field of lasers, can solve problems such as difficult control and multiple pulses
Active Publication Date: 2012-09-26
TSINGHUA UNIV
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Problems solved by technology
When the opening time of the Q-switching switch is longer than the time required for laser pulse establishment, the pulse width of the Q-switching laser pulse will be widened, but it is not easy to control, and multi-pulse phenomenon is prone to occur, that is, when the Q-switching switch is turned on once, the laser Emitting Multiple Q-Switched Pulses (W. Kechner, translated by Sun Wen, Jiang Zewen, Cheng Guoxiang. Solid Laser Engineering [M]. 2002, Beijing: Science and Technology Press, 410-448)
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[0020] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0021] The present invention provides a laser pulse width and waveform control method based on Q-switching stepwise opening, comprising the following steps:
[0022] S1. According to the parameters of the laser, set the parameters of the steps of the Q-switching switch. The steps of the Q-switching switch are used to control the step-wise opening of the Q-switching switch. At a moment, turn on a part again, and continue until the Q-switching switch is fully opened; the parameters of the laser include the pumping of the gain medium, the gain characteristics, the cavity length of the resonator, and the two cavity mirrors that form the resonator. Reflectivity.
[0023] The ...
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The invention relates to the technical field of laser devices, and discloses a laser pulse width and waveform control method based on step-type opening of a Q-switch. The method is characterized in that the Q-switch is controlled so as to be opened in a step manner instead of being opened at one step, namely, a small portion of the Q-switch is opened in the beginning, another small portion of the Q-switch is opened after a certain period of time, the procedure is carried out repeatedly, opening degrees, namely the heights of steps, can be identical or different, and the time interval between each two sequential opening procedures, namely the width of the corresponding step, can be identical or different. By means of setting the quantity of the steps and adjusting the widths and the heights of the steps, the pulse width and the waveform of light pulses outputted by a Q-switching laser device are controlled. The laser pulse width and waveform control method based on the Q-switch can be applied to quick active Q-switching laser devices with a laser medium energy storage function, and is also applicable to quick active Q-switching laser devices with a resonant cavity energy storage function, namely 'cavity-dumping' laser devices.
Description
technical field [0001] The invention relates to the technical field of lasers, in particular to a method for controlling the pulse width and waveform of laser pulses based on the stepwise opening of Q-switching switches. Background technique [0002] Q-switching technology can be used to generate laser pulses with high energy and high peak power. According to the different laser pulse widths, Q-switched laser pulses can be divided into long pulses (ms level) and short pulses (ns level). Long pulse laser It is widely used in various fields such as aviation, aerospace, medical treatment, food, nuclear energy, microelectronics, computer, etc. Short pulse laser has important application value in the fields of laser drilling, laser cleaning and surface impact strengthening (Fang Minggang. Short pulse laser Laser and its application [J]. Laser and Infrared, 2006, 36(12): 1136-1138). The working principle of the Q-switching switch is: when the Q-switching switch is turned off, the...
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IPC IPC(8): H01S3/11
Inventor 巩马理王涛柳强闫平黄磊张海涛刘欢
Owner TSINGHUA UNIV