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Long Pulse Detection Laser For Industrial Laser-UT
  Laser-ultrasonics is a non-contact ultrasonic technique that combines the precision of ultrasound with the flexibility and rapid scanning capabilities of optical systems. The sensitivity of a laser-ultrasonic system is ultimately limited by the amount of light received by the detector. Since light is carrying the information, more light received will produce a better signal to noise ratio of the recorded signal. Increase light collection can be done by modifying the surface of the inspected parts, such as polishing the surface or adding a reflective coating. Although this can be done in laboratory conditions, in industrial application, it is generally required to inspect the parts “as is”. In such a situation, increasing the incident laser light to the inspected parts is the only pratical approach. Tecnar’s PDL (Pulse Detection Laser) was precisely developed to provide high-power output for laser-ultrasonics inspection. With peak power output above 500W per pulse, the PDL allows easy laser-ultrasonic inspection of industrial-grade parts.
  In laser-ultrasonics the information is “encoded” in the frequency fluctuation of the laser light reflected from the surface of the inspected part. Any frequency fluctuation of the laser source itself will be mistaken as a signal. Only highly frequency stabilized laser sources can therefore be used for laser-ultrasonic detection. Standard laser source does not provide the sufficient frequency stability. “Ring-type” CW lasers are commercially available, which provides very high-frequency stability (under 1kHz). Such lasers are provided by TECNAR integrated in the laser-ultrasonic detection unit such as the TWM or the FPC. However, the power output of such laser is generally limited to under 10W.
  The PDL is a Pulsed frequency-stabilized laser specifically designed for the detection of ultrasound using Laser light. The PDL is based on a MOPA (Master Oscillostor Pulsed Amplifier) configuration and flashlamp based optical amplification. As shown in the figure, in the PDL, the output of a frequency stabilized low-power laser is injected in an amplification medium. When the flashlamp (optical pumping) is triggered, the incident laser light is amplified while conserving the same characteristics in wavelength, phase and polarity as the initial laser light. Therefore, at the output of the amplifying medium, the laser light is amplified several fold while conserving the characteristics needed for laser-ultrasonic detection. Multiple pass through the amplifying medium or through several media, is used to achieve very high-power output. In the PDL, a low-power CW frequency stabilized seed laser is amplified from 200mW (CW) to above 500 W (peak power). The wavelength and line width (less than 10kHz) is compactible
  To know more about this system or to receive a quotation, please do not hesitate to contact us at: lasernde.sales@tecnar.com

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