High-power semiconductor lasers and high-power semiconductor lasers pumped lasers are widely used in material processing, laser marking, laser ranging, laser storage, laser display, laser illumination, laser medical and other civil fields, as well as laser guidance, laser night vision, laser weapons and other military fields. How to realize the reliability and aging test evaluation of high-power semiconductor lasers, including the study of the pump source of the test system, has been one of the hot spots of the discipline and one of the important directions of international manufacturing research.
This program will introduce you a kilowatt-class semiconductor laser on-line testing and aging system, as well as compatible with CW and QCW aging power supply. The product can collect the working current, working voltage, output optical power and other parameters of each aging device in real time, and monitor the heat sink temperature, cooling circulating water flow and water temperature in real time, which has the advantages of complete functions, high reliability and excellent cost performance, and can be used for the development and application of high-power laser units to promote the use of the system.
The laser is mainly composed of a pump source, a gain medium and a resonant cavity. Among them, the pump source is the light source of the laser, providing energy for the laser. Lasers can be divided into four categories according to the pumping method of electric pumping, chemical pumping, optical pumping, pneumatic pumping, can also be divided into liquid lasers, gas lasers, semiconductor lasers and solid-state lasers and so on according to the gain medium. Semiconductor lasers can be used alone as a laser, but also as a fiber laser and solid-state laser pumping source.
The use of semiconductor lasers as a solid-state laser pumping source can be compatible with both solid-state lasers and semiconductor lasers, the dual advantages: high photoelectric conversion efficiency, high power, high stability, high reliability, long life, small size, the semiconductor laser has been gradually replaced by the traditional chlorine or argon lamps, solid-state lasers have become the main pumping source, are widely used in the field of materials processing, medical and scientific research.
Table: Comparison of laser types
Pump source is the source of laser energy, according to the law of conservation of energy, laser output laser energy beam, need to produce laser energy input, pump source that is to play the role of energy excitation of the gain medium. Laser work, the pump source to the gain medium injected energy for excitation, the gain medium of the electron by the energy excitation occurs after the energy level jump, from the ground state jump to the excited state, due to the excited state compared to the ground state is a non-stationary state, the electron will spontaneously return to the ground state, and put out photons. Countless photons in the resonant cavity of the two sections of the cycle, reciprocating motion, constantly superposed, and ultimately the output direction, the frequency is highly consistent, high-energy laser beam.
Figure: Working principle diagram of the laser
Figure: Schematic diagram of the principle of excited radiation of a laser
High-power semiconductor lasers are mainly divided into single-tube and bar bar two kinds of structure, single-tube structure more wide optical cavity design, and increase the gain region, in order to achieve high power output, reduce the cavity surface disaster damage; bar structure for more than one single-tube lasers in parallel line array, more than one laser work at the same time, and then through the beam and other means to achieve high-power laser output.
Figure: Laser single tube vs. bar bar (line array) structure
Figure: Side-emitting and surface-emitting lasers
Typical packages for semiconductor lasers
Packaging on the role of the semiconductor laser: First, the establishment of the current loop, so that the chip can be stimulated by the current and produce light (stimulated radiation light amplification); Second, heat dissipation, to solve the chip when the heat generated by the light; Third, the chip and the circuit to play a role in protecting.
According to the function, there are two types of semiconductor laser package, one is the protective shell package, the second is the chip package. Protective shell package mainly TO package and butterfly package. This packaging structure is to cos with other materials such as metal protective cover sealed up, the benefits are: first, so that it will not be easily damaged, and secondly, the cavity surface is contaminated by the effective reduction of the chances of third is very easy to carry. Chip package mainly F-Mount type package, C-Mount type package. Chip packaging is the chip directly welded to different structures, different materials, a method of heat sink, the role of the heat sink is mainly to the chip when the heat generated by the luminous dissipation, to ensure that the chip can continue to work stably.
Importance and Status of Semiconductor Laser Chip Testing
The testing of laser chips is more complex, involving optical and electrical measurements, and also taking into account the differences in packaging forms. Compared with the same power level of traditional solid-state lasers or gas lasers, high-power lasers have obvious advantages in beam quality, efficiency, structure volume, life and system maintenance. But at the same time, due to the single chip out of the optical power, the unit area of heat generated by the large, if not good heat dissipation technology, will directly affect the output power of the semiconductor laser, threshold current density, electro-optical conversion efficiency, differential quantum efficiency, polarization and other properties, and lead to a decline in the life of the semiconductor laser and the reliability of the chip will be damaged, and ultimately affect the reliability of the device. Therefore, it plays a very important role in the development of the laser industry chain to put the laser chips under extreme operating conditions such as high temperature and current for life and reliability experiments, to eliminate the early failure devices and to detect the failure factors before delivering them for use.
At present, high-power laser chips generally face various difficulties in continuous output of high-current operation.
1, laser chip measurements generally have to look at the LIV data, photoelectric parameters are affected by heat is relatively large, as the temperature rises, the chip's threshold current increases.
2, laser chip DC, wide pulse under the test results are not allowed; 3, high-power laser surge impact resistance is poor, the requirements of the pulse current without overshoot, surge impact is small.
4, power supply fluctuations will affect the life of the laser, while causing optical power instability and device heating instability.
Innovative technological breakthroughs, localized excellent cost-effective laser aging test system solutions
Based on the technical development strength of the first localized digital source meter (SMU), as well as years of product coverage of international communications and semiconductor head user recognition and application research, Wuhan Purcells for the kilowatt-class high-power semiconductor laser chips need to use a narrow pulse of high-current testing and aging, chip heating and other serious problems, innovation and development of a set of good versatility, high-power, water-cooled aging test system. The product has good characteristics of high current narrow pulse constant current, current stability, strong anti-interference ability, and anti-overshoot, anti-backlash, anti-surge voltage regulator and constant current double protection circuit and other functions, for the pump laser aging test provides a complete solution. It realizes an integrated test system with multiple units, high efficiency, automatic monitoring and recording and uploading of test data.
Figure: Prosser LDBIXX series multiplexed high power laser aging system
After many years of systematic research on digital source meter and the good foundation of product industrialization, Purcells pump laser aging test system adopts the newly developed and independently designed high-current pulse constant-current source, which can be compatible with CW mode (60A) and QCW mode (600A) and supports four modes, such as DC constant-current, DC scanning, pulsed DC, pulsed scanning, etc. The drive power supply is controlled through RS485 interface, the host computer sets the output current and can read out the actual output value; in addition, it can also be connected in series and parallel with multiple units in a master-multiple-slave way. Drive power supply through the RS485 interface control, the host computer to set the output current, and can read out the actual output value; in addition, you can also be a master multi-slave multiple series-parallel connection, the host computer only need to control the host, the slave can realize the synchronous output. Support linear scanning, logarithmic scanning and customized scanning.
Figure: Purcells HCPLOXX series high power laser test power supply
Prosser offers a complete solution for aging testing of high power semiconductor lasers. For more information about our system solutions, please contact us.
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