Pulse driving circuit for semiconductor laser
A technology of pulse drive and laser, which is applied in the direction of semiconductor lasers, lasers, laser components, etc., can solve the problems of large pulse width, small drive current, slow response time, etc., and achieve the effect of increasing drive current and small linearity distortion
Active Publication Date: 2010-06-30
浙江振东光电科技有限公司
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Problems solved by technology
The design principle of the traditional semiconductor laser pulse drive circuit is to use the synchronous signal to trigger the on-off of the high-power transistor to control the optical pulse trigger frequency, and to control the output optical pulse width of the semiconductor laser by selecting different energy storage capacitors. This circuit design Generally, there are disadvantages of slow response time, large pulse width, and small driving current.
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[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0020] Such as figure 1 The semiconductor laser pulse drive circuit shown includes a semiconductor laser trigger circuit 1 and a pulse current source circuit, and the pulse current source circuit includes a filter circuit 21 , a differential circuit 22 , and a circuit source circuit 23 .
[0021] The semiconductor laser trigger circuit 1 includes an energy storage capacitor C9, a protection resistor R14, a field effect transistor Q1, a first diode D1, a second diode D2, a tenth resistor R10, an eleventh resistor R11, and a field effect transistor Q1 The drain of the storage capacitor C9 is connected to the first end of the energy storage capacitor C9, the first end of the energy storage capacitor C9 is also connected to the first end of the protection resistor R14, and the second end of the protection resistor R14 is connected to the first con...
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The invention relates to a pulse driving circuit for a semiconductor laser which is used for generating a pulse current for striking the semiconductor laser to shine. The pulse driving circuit comprises a semiconductor laser trigger circuit and a pulse current source circuit, wherein the input end of the pulse current source circuit is connected with an external connected trigger pulse; the output end is connected with the grid of a field-effect tube; the field-effect tube is controlled to switch on and off by the input trigger pulse. The pulse current source circuit comprises a filter circuit, a differentiating circuit and a circuit source circuit. Compared with the prior art, the circuit of the invention has the advantages that when the external connected trigger pulse has no trigger signal, a fourth triode and a sixth triode in the circuit source circuit are switched on and the field-effect tube is cut-off; when the external connected trigger pulse has a trigger signal, the differentiating circuit immediately superposes the trigger signal onto the circuit source circuit, drives the field-effect tube to be switched on and rapidly discharges the charges accumulated on an energy storing capacitor so as to generate the pulse current required by the semiconductor laser.
Description
technical field [0001] The invention relates to a semiconductor laser pulse drive circuit. Background technique [0002] With the development and wide application of optical fiber sensing technology, people have higher and higher requirements for the design index of the semiconductor laser drive circuit with narrow pulse and high current. The design principle of the traditional semiconductor laser pulse drive circuit is to use the synchronous signal to trigger the on-off of the high-power transistor to control the optical pulse trigger frequency, and to control the output optical pulse width of the semiconductor laser by selecting different energy storage capacitors. This circuit design Generally, there are disadvantages of slow response time, large pulse width, and small driving current. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a semiconductor laser pulse drive circuit with fast response time, narrow pul...
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IPC IPC(8): H01S5/042
Inventor 杨如祥
Owner 浙江振东光电科技有限公司