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DETECTOR DE ENERGÍA DE PULSOS LÁSER INFRARROJO BASADO EN EL EFECTO FOTOACÚSTICO
INFRARED LASER PULSE ENERGY DETECTOR BASED ON PHOTOACOUSTIC EFFECT
Keywords:
Fotoacústica pulsada, Radiación infrarroja, Sensor piezoeléctrico (es)Pulsed photoacoustic, Infrared radiation, Piezoelectric sensor (en)
Se reporta la respuesta fotoacústica de un sensor piezoeléctrico que fue irradiado con pulsos láser de longitud
de onda de 1064 nm y distinta energía emitidos por un láser Nd:YAG. La medida de la energía de los pulsos
laser se hizo con un medidor, marca Newport modelo 1936-R con sensor piroeléctrico y las señales fotoacústicas
con un osciloscopio Tektronix, modelo DPO3054 de 500 MHz. Experimentalmente se encontró una dependencia
lineal entre la intensidad de la señal fotoacústica del sensor piezoeléctrico y la energía del pulso laser. La sensibilidad
de la respuesta fotoacústica del sensor fue dependiente de la placa protectora. Para placas de aluminio y aluminio
pintado de negro fueron (6.52 ± 0.06)mV/mJ y (51.2 ± 1.5)mV/mJ respectivamente. Se concluyó que este tipo de sensor piezoeléctrico es muy sensible a los cambios de energía de láseres pulsados de 1064 nm, su respuesta es directamente proporcional a la energía incidente, es apropiado para mediciones de energía de láseres pulsados en tiempo real y, no se ve afectado por ruidos acústicos ni condiciones de iluminación del laboratorio.
We report the photoacoustic response of a piezoelectric sensor that was irradiated with laser pulses of wavelength of 1064 nm and different energy emitted by an Nd:YAG laser. The measurement of laser pulse energy was done with a meter, Newport model 1936-R with pyroelectric sensor and the photoacoustic signals with a Tektronix oscilloscope, model DPO3054 of 500 MHz. Experimentally, we found a linear dependence between the intensity of the photoacoustic signal of the piezoelectric sensor and the energy of the laser pulse. The sensitivity of the photoacoustic response of the sensor was dependent on the protective plate. For aluminum and aluminum plates painted black were (6.52 ± 0.06)mV/mJ and (51.2 ± 1.5)mV/mJ respectively. It was concluded that this type of piezoelectric sensor is very sensitive to the energy changes of 1064 nm pulsed lasers, its response is directly proportional to the incident energy, it is suitable for energy measurements of lasers pulsed in real time and it is not seen affected by acoustic noises or lighting conditions of the laboratory.
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