Industrial-grade stability: High-temperature performance and reliability test report of 780nm fiber AOM

Industrial-grade stability: High-temperature performance and reliability test report of 780nm fiber AOM

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In the complex environment of industrial production, many devices need to operate stably under high-temperature conditions. As a key component of optoelectronic systems, the high-temperature working performance and reliability of the 780nm fiber optic acousto-optic modulator (AOM) are of vital importance. This report delves deeply into the performance of 780nm optical fiber AOM in high-temperature environments, providing crucial references for industrial application selection. ​

Industrial environment Challenges and 780nm Optical Fiber AOM

Industrial sites are often accompanied by harsh conditions such as high temperatures, high humidity, and strong electromagnetic interference. For 780nm optical fiber AOM, high temperature can affect the performance of acousto-optic media, piezoelectric transducers and internal optical paths, leading to increased insertion loss, modulation frequency drift, slower response speed and other problems, which in turn affect the stability and accuracy of the entire optoelectronic system. For instance, in high-temperature industrial scenarios such as steel smelting and glass manufacturing, the AOM in laser processing and detection systems needs to withstand prolonged high-temperature tests. ​

Key indicators of high-temperature working performance

(1) Changes in insertion loss

Insertion loss measures the energy loss when a laser passes through an AOM. In a high-temperature environment, the thermal expansion and refractive index change of the acousto-optic medium will increase the insertion loss. For high-quality 780nm fiber AOM, within the specified high-temperature range (such as 50℃ - 80℃), the insertion loss increment should be controlled within a certain range (such as < 0.5dB) to ensure sufficient optical energy to participate in modulation and maintain the output power and signal-to-noise ratio of the laser system. ​

(2) Frequency stability

The accuracy of the modulation frequency of AOM directly affects the function of the laser system. High temperature may cause performance drift of piezoelectric transducers, change the conversion efficiency between radio frequency signals and ultrasonic waves, and result in modulation frequency deviation. Industrial applications require that the frequency drift of 780nm optical fiber AOM be controlled within an extremely small range (such as ±0.1%) at high temperatures to ensure the accuracy of applications such as laser Doppler velodrometry and optical communication signal modulation. ​

(3) Response speed is maintained

The response speed determines the following ability of the AOM to modulated signals. High temperature may intensify phonon scattering within the acousto-optic medium, slow down the ultrasonic response speed, and lead to an prolonged rise time of AOM. In scenarios such as ultrafast laser pulse modulation and high-speed optical communication data coding, the AOM needs to maintain a rapid response at high temperatures (such as rise time < 40ns) to ensure the high-speed operation of the system. ​

Reliability test plan

(1) Experimental equipment and samples

Multiple batches of different models of 780nm optical fiber AOM were selected and placed in a high-temperature test chamber with precise temperature control. The experimental equipment includes high-precision optical power meters, radio frequency signal generators, spectrum analyzers, etc., which are used to monitor various performance indicators of AOM. ​

(2) Testing Process

After calibrating the AOM at room temperature, it was heated to the target high temperature (70℃) at a rate of 5℃/ hour and maintained at a constant temperature for 24 hours. During this period, parameters such as insertion loss, modulation frequency, and rise time were measured every hour. Subsequently, it was cooled to room temperature at the same rate and then the next round of cycles was carried out. A total of 10 heating and cooling cycle tests were conducted. The test process simulates the temperature changes in actual industrial operation to verify the long-term high-temperature stability of AOM. ​

Test Results and Analysis

(1) Insertion loss results

The test results show that for most AOM, the insertion loss increases slowly during the heating process. At the constant temperature stage of 70℃, the average increment of insertion loss is 0.3dB, which does not exceed the threshold of 0.5dB. After cooling, the insertion loss basically returned to the room temperature level. Some AOMs with outstanding performance have insertion loss fluctuations of less than 0.2dB throughout the entire test process, demonstrating good thermal stability and ensuring efficient transmission of optical energy. ​

(2) Results of frequency stability

In terms of modulation frequency, a few AOMs show frequency drift during heating, but the maximum drift is only 0.08%, which is much lower than the allowable range of ±0.1%. The frequency fully recovered after cooling. This indicates that the piezoelectric transducer and related circuits are reasonably designed, which can effectively resist high-temperature interference and maintain the accuracy of the modulation frequency. ​

(3) Response speed results

The rise time of AOM is somewhat prolonged at high temperatures. For most products, it is prolonged from < 35ns at room temperature to < 40ns, still meeting the requirements of high-speed modulation scenarios. Some high-end models have a stable rise time of less than 38ns at high temperatures. Their internal structure and materials have excellent resistance to thermal interference, ensuring rapid response characteristics. ​

 

Comprehensive tests show that the 780nm optical fiber AOM has stable most key performance indicators in high-temperature environments and possesses industrial-grade reliability. A few performance fluctuations are within an acceptable range. Through optimized design (such as improving the heat dissipation structure and selecting high-temperature stable materials), it is expected to further enhance the high-temperature working performance. In industrial high-temperature application scenarios, the rational selection of 780nm optical fiber AOM and the adoption of necessary temperature control measures can ensure the long-term, stable and efficient operation of optoelectronic systems, and promote the process of industrial automation and intelligence upgrades.

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