The temperature control of fiber laser in the process of R&D and quality inspection directly determines its quality and service life. In this paper, we take pump source, beam combiner, optical fiber, etc. as examples to talk about how to detect the temperature of each group of the laser to improve the efficiency of R&D and the quality of product production.
1. Optical fiber quality monitoring
Optical fiber is an important bridge connecting each module of the laser, if the laser has problems such as aging of the fiber fusion joint and damage of the fiber coating during the work of the laser, it will directly affect the quality of the laser output of the laser, and even cause the laser to be damaged and burned off.
Therefore, in the manufacturing process of fiber lasers, the FOTRIC online thermal imager can be integrated into the automation equipment to collect the temperature data of the optical fiber, automatically locate the high-temperature defect points caused by the optical discontinuity at the optical fiber fusion or the damage of the optical fiber coating, and quickly judge whether the fiber quality is qualified, which not only saves manpower, but also greatly improves the detection efficiency and production quality.
▲The thermal imaging camera detects the abnormal temperature of the optical fiber splice
▲Thermal imaging camera detects damage to optical fiber coating
2. Quality inspection of pump source
The pump source is the power source of the fiber laser, according to the different power, the number of pump sources is also different, the pump source is working, a large amount of heat is generated, and this heat will affect the wavelength of the LD chip output laser in the pump source.
FOTRIC handheld thermal imager is a non-contact temperature measurement, with a thermal sensitivity of 30mk, it can accurately detect the temperature difference of each part of the LD chip inside the pump source, judge whether it meets the requirements, and can also collect the temperature information of all components inside the entire pump source at one time, so as to avoid temperature changes caused by contact, and can also automatically capture the full screen or the hottest spot in the region, with clear imaging, efficient and no blind spots to find defects, which increases the qualification rate of the product.
▲The thermal imaging camera detects the temperature of the LD chip inside the pump source
▲The thermal imaging camera detects the internal components of the pump source
3. Beam combiner temperature detection
The function of the beam combiner is to combine multiple pump lasers into a single laser beam to achieve a high power output of the laser. As a passive optical coupler, the beam combiner has a large optical power loss, so the high-power beam combiner needs to be forced cooling.
The FOTRIC online thermal imaging camera has the function of full radiation thermal image video recording, which can monitor the shell temperature of the beam combiner, 30HZ high frame rate recording, which can capture the instantaneous change of temperature, record the temperature change and distribution of the beam combiner in real time, view the temperature rise curve at any time, and also conduct arbitrary analysis of the video in the later stage, which is convenient for finding problems and improving product quality.
▲Thermal imager detects the beam combiner
To test fiber lasers, we recommend the FOTRIC 600C and the FOTRIC 340+ high-end handheld camera:
1. Non-contact temperature measurement, which does not affect the measured object, collects all temperature points in the whole picture, automatically captures the full screen or the hottest spot in the region, intuitively sees the problem points, and finds the problem efficiently without blind spots;
2. The temperature measurement is accurate and can be stable for a long time.
3. The 340+ thermal imager can be used portably, or it can be connected to a computer and transformed into an online thermal imager with AnalyzIR software, recording full-radiation video to grasp the thermal diffusion path and temperature rise curve, which is convenient for R&D and analysis;
4. Support sub-regional emissivity setting, set different emissivity for different measured materials in the same picture, and the temperature measurement is more accurate;
5. Support temperature threshold, time, duration and other triggers to achieve automatic data collection and improve work efficiency;
6. Equipped with macro lens, support 20μm resolution ability, can check the temperature of small objects;
7. Powerful professional analysis software to achieve multi-dimensional analysis of two-dimensional, three-dimensional, time-domain, temperature difference, etc.
From: Laser Industry Watch
Yangtze River Delta G60 Laser Alliance Chen Changjun reprinted!
At the same time, welcome to the 2nd Conference on the Application of Laser Intelligent Manufacturing in the Energy Storage Industry held by the Yangtze River Delta G60 Laser Alliance in Nanjing (Nanjing, April 23-25, 2024)