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Optoelectronics, TESTING

Lasers Endurance Characterization in Vacuum Conditions – Test Setup

  • Posted by Alejandro López Moya
  • On January 25, 2022
  • 0

Sometimes, Laser diodes characterization can be hard due to the laser’s nature. In the case of lasers, perfect control of current and temperature applied is mandatory. In addition, a good heat dissipation must be provided to avoid lasers being damaged. Special and complex equipment is required for a perfect characterization because accuracy is a must with this kind of optical component. Tiny variations in the range of picometers must be detected to carry out a perfect characterization.

When Lasers must be tested in extreme conditions like vacuum or high/low temperatures, test setup definition and implementation becomes a real challenge.

LIV Characterization for semiconductor laser

Figure 1. LIV Characterization for semiconductor laser

Figure 2. Variation of emission wavelength of semiconductor laser

Figure 2. Variation of emission wavelength of semiconductor laser

A complete Lot Acceptance Test sequence involves a high volume of tests (Mechanical, Environmental, Radiation, Assembly, ESD,..). Still, in this case, the most tricky test to carry out was the Endurance test, where 12 lasers from different wavelengths (NIR, SWIR1, and SWIR3, from 350nm to 5um) were powered at their nominal current during 1000 hours while in vacuum conditions.

Each laser was controlled at its nominal temperature with 12 independent TEC controllers, while the temperature inside the chamber was also controlled at 50ºC.

In addition, the optical power of every laser was monitored with an array of photodiodes (Si and InGaAs) along the entire test to check degradation. Temperatures of every laser and TEC voltages on lasers were also monitored.

The LabVIEW application was developed to control all equipment involved in the test and to show and record all signals required.

LabVIEW is an engineering software created by National Instruments, with a powerful graphical programming environment. It is mainly used for data acquisition, instrument control, measurement analysis, and representation. It provides all the elements required for the complete automation of a test system. Still, it can be used for an enormous variety of diverse applications, like product design validation of a component/system/sub-system.

Endurance test setup block diagram

Figure 3. Endurance test setup block diagram

Lasers and photodiodes were mounted on metallic cylinders, each one at one side of the tubes. For heat conduction from the vacuum chamber baseplate to the lasers, metallic supports were designed and manufactured. Powering of lasers was carried out through precision SMUs (Keithley 2602B). For photodiode current measurements, one digital multimeter HP3478-A was used. To switch between photodiodes to monitor, a relay matrix was used.

This relay matrix was controlled by one Microcontroller with specific C- code developed by ALTER.

Lasers mounted on vacuum chamber baseplate

Figure 4. Lasers mounted on vacuum chamber baseplate

Vacuum chamber used for endurance test

Figure 5. Vacuum chamber used for endurance test

Finally, all endurance test results were satisfactory, and all lasers continued with the LAT test sequence.

Lot Acceptance test (LAT)

A Lot Acceptance Test (LAT) is a reduced set of Qualification tests over components or equipment required to accept a specific manufacturing lot for its use. Previously to LAT, manufacturers must have carried out a Qualification process where a complete set of tests is done over them.

Previously to LAT, a Screening test sequence is carried out over the lot under test to detect potential failures (i.e., infant mortality) and to assure that components/equipment specifications are inside the ones provided by the manufacturer. In the case of components, this Screening test sequence also allows selecting the best ones for the final application (i.e., Flight models for space applications). The rest of the components continue with the LAT sequence.

Lasers mounted on vacuum chamber baseplate

Figure 6. Lasers mounted on vacuum chamber baseplate

Every family of components has its own standard for LAT sequence. This sequence normally includes Mechanical tests, like vibration and shocks, ESD tests, Environmental tests, Endurance tests, Radiation tests (Heavy ions, Gamma,…), Thermal vacuum tests, Assembly tests, and so on… This set of tests could be modified depending on the final application of the component/equipment. An example of LAT sequence for Laser Diodes, according to ESCC23202 is shown below:

 

Lasers mounted on vacuum chamber baseplate

Figure 7. Lasers mounted on vacuum chamber baseplate

A LAT sequence also allows customers to have complete traceability of the components they are going to use in their application, from the wafer used during manufacturing.

About ALTER TECHNOLOGY

ALTER TECHNOLOGY is the leading provider of micro and optoelectronics services in engineering, procurement, assembly, and test in space and harsh environment markets.

Our company develops and offers complete turn-key solutions covering front-end engineering tests, wafer and dice probing, and final tests, as well as wafer sawing, packaging, and assembly. Our services also extend to equipment and systems testing and certification in fields like small satellites, drones, security, transport, nuclear, etc.

Our organization works with superior technology, breakthrough innovations, and advanced applications to make our partner’s work easier.

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Alejandro López Moya
Alejandro López Moya
Test Engineer in Innovation and New Technologies Department at Alter Technology Tüv Nord
Alejandro López Moya has a Degree in Electronics Engineering from the University of Jaén.

After ending his studies in 2010, Alejandro started to work as a Test engineer, where he has accumulated more than 10 years of experience. He has developed a career focused on the design/development/execution of test systems for the most leading technology sectors like Aerospace, Aeronautics, and Automotive.

Since he joined Alter Technology in June 2016 as part of the Optoelectronics and New Technologies Department, Alejandro has been in charge of developing complex electronics designs based on FPGA/uP for Image sensors and mixed-signal ICs testing. Still, at the same time, he has been responsible for test setup development and test execution for all kinds of optoelectronics components. Within his framework, he is currently qualifying components for ESA projects like JUICE.
Alejandro López Moya
Latest posts by Alejandro López Moya (see all)
  • IR SOURCES THERMAL VACUUM CYCLING CHARACTERIZATION - February 11, 2022
  • Lasers Endurance Characterization in Vacuum Conditions – Test Setup - January 25, 2022
  • Calibration Sources in Vacuum Conditions - January 13, 2022
TAGS: EEE PARTS ENVIRONMENTAL TESTING EEE PARTS THERMAL CYCLING Temperature

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