Abstract
When the Er: YAG laser pumped by a xenon lamp emits laser light, the energy, frequency and pulse width of the emitted light are closely related to the discharge of the xenon lamp. This article uses the 8MHz external crystal oscillator that comes with the STM32F4 development board, generates a clock source through frequency division and frequency multiplication, and configures a pulse width modulation (PWM) signal to control the laser. Since the signals sent by the development board are weak signals, it is necessary to design a corresponding drive circuit to amplify the power of the signal. Finally, the voltage of the pulsed xenon lamp is adjustable from 0 to 1400V, and the pulse width is adjustable from 50 to 300μs to achieve stable laser output.
Highlights
Through the 4I11/2→4I13/2 energy level transition of Er3+ in the highly doped Er3+ YAG laser [1], a laser of 2.94μm can be emitted
With the continuous upgrade of ARM chips, STM32 series development boards can already run embedded systems, and more and more lasers use this type of chip to develop and operate control systems
The output of the switch type signal is a high and low level signal, which directly controls the output to be 0V and 3.3V; the PWM signal is a pulse width modulation signal with an adjustable duty cycle
Summary
Through the 4I11/2→4I13/2 energy level transition of Er3+ in the highly doped Er3+ YAG laser [1], a laser of 2.94μm can be emitted. As early as the 1980s, after the erbium laser was successfully developed abroad, it began to explore medical applications. With the continuous upgrade of ARM chips, STM32 series development boards can already run embedded systems, and more and more lasers use this type of chip to develop and operate control systems. Because the current chips are equipped with abundant peripherals and the performance is very superior, the laser control system is simpler than before, with higher integration and more functions. With the improvement of chip technology, higher performance STM32 chips will gradually be applied to laser control systems. The output of the switch type signal is a high and low level signal, which directly controls the output to be 0V and 3.3V; the PWM signal is a pulse width modulation signal with an adjustable duty cycle. Because the output voltage and current of the control signal are
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