Laser power detection device and detecting control method

Abstract

The invention relates to the detection of the power or energy of laser and discloses a laser power detector and a detection control method. The device comprises a laser, an optical shutter positioned inside the laser, a sampling sheet positioned at the laser output terminal of the laser, a convergent lens, a photodiode and a microcontroller. The method comprises the steps: 1) zero adjustment is carried out; 2) the optical shutter is closed so as not to generate laser; 3) the microcontroller collects stray light and electromagnetic interference signals which are used as offset A to be stored;4) the optical shutter is opened to cause the laser to generate laser, and the microcontroller collects the summation B of the laser, the stray light and the electromagnetic interference signals; 5) the microcontroller processes (B minus A) to obtain the power value or energy value of the laser; and 6) circuit parameters are changed, and the steps 1) to 5) are repeated so as to obtain the accurate power value or energy value of the laser. The invention has simple structure and low cost and can accurately and quickly measure the laser power.

Description

technical field [0001] The invention relates to the detection of laser power or energy, in particular to a laser power detection device of a medical laser. The invention also relates to a detection control method for the laser power detection device. Background technique [0002] Before the present invention was made, generally the detection of laser power should take into account the design of the three aspects of opto-mechanical and electrical. For laser detection as shown in Figure 1, the laser power detection schematic diagram of solid-state lasers, it is necessary to consider that in addition to the laser light, the laser power probe also measures the intense pulsed light emitted by some pump lamps. Since the sampling sheet only samples the laser light, a small Part of the laser light (approximately <1%) is reflected into the laser power sensor, so the interfering strong light can reach a level sufficient to interfere with each other compared with the laser, and wi...

AI Technical Summary

Problems solved by technology

[0003]The schematic block diagram of the laser power circuit is shown in Figure 2, which mainly has two functions of amplification and zero adjustment. The function of zero adjustment is to correct the deviation of the operational amplifier and the circuit. setting, so that the final output voltage is zero when there is no laser, and at the same time, in order to eliminate the influence of stray light. The astigmatism is also enhanced accordingly. Since the zeroing circuit is fixed after adjustment, it can only correspond to zeroing in specific situations, but it cannot be eliminated for changing stray light, especially for the measurement of pulsed laser energy. Since the composition of stray light is comparable to that of the laser, the measurement of the laser has a serious deviation

In addition, as the operating current changes, the interference of the circuit will also have different effects, resulting in deviations in the final output.

Therefore, in view of the current situation, there are also high-quality optical filters currently used to only allow laser light to pass through, but not to allow strong light to pass through. However, due to the instability of the optical filter, the final output is unstable.

Not only increases the cost, but also further increases the probability of failure

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