TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The partitioning unit is provided with a wave plate (121) to convert the emitted laser beam onto a first polarized light and a second polarized light intersecting with each other, a first polarizer (122) reflects the second polarized light emitted from the wave plate and transmits the first polarized light emitted from the wave plate, a reflecting mirror (102) reflects the second polarized light reflected from the first polarized light, and a second polarizer reflects the second polarized light reflected from the reflecting mirror and transmits the first polarized light transmitted from the first polarizer. The two laser beams are the first polarized light and the second polarized light. The distance adjustment unit adjusts the path of the second polarized light reflected from the reflecting mirror by adjusting the angle of the reflecting mirror and is installed on the reflecting mirror. The device further comprises a wave plate rotating unit to rotate the wave plate and adjusts the ratio of the first polarized light and the second polarized light emitted from the wave plate, and a controlling unit to control the wave plate rotating unit and ensures the same power of the first polarized light and the second polarized light. The first partitioning unit is provided with a first wave plate to convert the emitted laser beam onto a first polarized light and a second polarized light intersecting with each other, a first polarizer reflects the second polarized light emitted from the first wave plate and transmits the first polarized light emitted from the first wave plate, a first reflecting mirror reflects the second polarized light reflected from the first polarized light, and a second polarizer reflects the second polarized light reflected from the first reflecting mirror and transmits the first polarized light transmitted from the first polarizer. The second partitioning unit is provided with a third polarized light and a fourth polarized light intersecting with each other and with the first polarized light, a second wave plate to convert the emitted second polarized light onto a fifth polarized light and a sixth polarized light intersecting with each other, a third polarizer reflects the fourth and sixth polarized light emitted from the second wave plate and transmits the third and fifth polarized light emitted from the second wave plate, a second reflecting mirror reflects the fourth and sixth polarized light reflected from the third polarized light, and a fourth polarizer reflects the fourth and sixth polarized light reflected from the second reflecting mirror and transmits the third and fifth polarized light transmitted from the third polarizer. The four laser beam includes third polarized light, fourth polarized light, fifth polarized light and the sixth polarized light. The first distance adjustment unit adjusts the path of the second polarized light reflected from the first reflecting mirror by adjusting the angle of the first reflecting mirror and is installed on the first reflecting mirror. The second distance adjustment unit adjusts the path of the fourth and sixth polarized light reflected from the second reflecting mirror by adjusting the angle of the second reflecting mirror and is installed on the second reflecting mirror. The device further comprises a first wave plate rotating unit to rotate the first wave plate and adjusts the ratio of the first polarized light and the second polarized light emitted from the first wave plate, a second wave plate rotating unit to rotate the second wave plate and adjusts the ratio of the third, fourth, fifth and sixth polarized lights emitted from the second wave plate, and a controlling unit controls the first wave plate rotating unit and ensures the same power of the first polarized light and the second polarized light or controls the second wave plate rotating unit and ensures the same power of the third, fourth, fifth and sixth polarized light.