This standard specifies the method for measuring the continuous laser threshold, slope efficiency and input power of a Ru-doped YAG laser rod in a standard laser cavity with a wavelength of 1.6 μm. GB 11297.5-1989 Measurement method for continuous laser threshold, slope efficiency and output power of a Nd-doped YAG laser rod GB11297.5-1989 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test method for continuous lasing threshold, slope efficiency and output power of Nd : YAG laser radsUDC 621. 383. 032
26:621.39
GB11297.5-89
This standard specifies the method for measuring the continuous lasing threshold, slope efficiency and output power of Nd : YAG laser rads in a standard laser cavity with a wavelength of 1.06um.
1 Terminology
The terms used in this standard conform to GB11293 Terminology of Solid Laser Materials. 2 Measurement principle
The characteristic curve of continuous pumping auxiliary power and output of Nd : YAG laser rads is measured using a planar resonant cavity. In the rectangular coordinate system, the input power is used as the horizontal axis and the output power is used as the vertical axis to draw this characteristic curve. The intercept of the intersection of the extended line of the straight part of the characteristic curve and the input power axis is the continuous laser threshold of the laser beam: the slope of the straight part of the characteristic curve is the slope efficiency. The output power under a given continuous input power is the continuous output power. 3 Measurement device and measurement conditions
The continuous laser test system used for measurement consists of the following components: nitrogen laser, infrared image converter, 1.06 μn1 wavelength dielectric diaphragm, focusing cavity, continuous nitrogen lamp, continuous laser power supply, power meter. Its optical system is shown in Figure 1. Figure 1
1—Nd·YAG laser; 2—Infrared image converter; 3—Reflector; 4—Collecting cavity; 5—Lamp; 6—Nd·YAG laser to be measured; 7—Reflector at the output end; 8—Power meter 3.1 Continuous laser power supply
3.1.1 Continuous laser power supply: DC power supply, output power range is 0.5~6kW, and the power output power instability should be less than 1%. 3.1.2 Power trigger: The voltage should be able to trigger the nitrogen lamp with an air pressure of 600kPa. 3.1.3 The laser power supply should be continuously adjustable and equipped with a water pressure protection switch. 3.1.4 When working near the laser, the operator should wear protective glasses to avoid directly observing the laser beam or the light reflected from the mirror with the naked eye. 3.1.5 The accuracy of the power indicator of the power supply is better than Class 1.5. Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on October 9, 1988, and implemented on January 1, 1990
3.2 Ammonia lamp
GB 11297. 5-89
3.2.1 Nitrogen lamp: straight tube shape, gas pressure not less than 400kPa. The arc length of the lamp is 100mm, the inner diameter of the lamp is 7mm, and the outer diameter is not more than 9mm. 3.2.2 The nitrogen lamp and the laser rod to be tested should be covered with a protective glass tube or other filter material that cuts off ultraviolet light. 3.3 The optical cavity adopts a metal cavity, the reflective surface in the cavity is gold-plated, and the maximum allowable value of the surface roughness R. is 0.01μm. The semi-long axis length of the focusing cavity is 17mm, the semi-short axis length is 15mm, the eccentricity is 0.47, and the focusing cavity length is 100mm. 3.4 The reflectivity of the total reflector for the light wave with a wavelength of 1.06um should be greater than 99.7%. 3.5 The transmittance of the output end reflector for the light wave with a wavelength of 1.06μm is 13%~17%. 3. The length of the continuous laser resonant cavity is 400mm. 3.1 The accuracy of the power meter is ±5%.
3. Use a hydrogen laser to debug the resonant cavity and use an infrared image converter as a display to make the resonant cavity reach the best state. 4 Calibration
Before each measurement, the continuous laser measurement system needs to be calibrated with a calibration laser rod to ensure the stability and accuracy of the measurement system. 4.1
Check whether the film layer of the reflector at both ends of the resonant cavity is scratched or detached, and whether the reflectivity changes. If there is a change, the reflector film needs to be replaced. Install the reflector on the adjustment frame and use the nitrogen-nitrogen laser beam to adjust the reflected light spots of the two reflectors to coincide. Install the calibration laser rod with known characteristic curve into the focusing cavity, adjust the reflected light spot on the end face of the rod and the reflected light spot of the membrane at both ends of the resonant cavity to the same weight. 4.4 Align the center of the receiving hole of the power meter with the laser beam. 4.5 Light the nitrogen lamp to make the input power large enough to make the resonant cavity oscillate and have laser output. Use the infrared image converter as a display, repeatedly adjust the resonator to make the laser in the most resonant state, at which time the reading power is the minimum. 4.6 Increase the input pump power and measure the output power with a power meter. The output power is calculated according to formula (1): bZxz.net
P=V×I
Where:
Input power, W:
TInput current, A,
V-Input voltage, V.
4.7 Use coordinate paper to draw the characteristic curve of the standard rod, so as to calculate the continuous laser cabinet value and slope efficiency. Compare this calculated result with the calibration rod and known data. If the relative error of the two results is within the allowable error range of the production 5, the measurement can be carried out. Otherwise, the system must be re-adjusted. Check whether the components meet the requirements, or replace some components. 5
Measurement steps
Encapsulate the micro-optical rod to be measured in the sleeve with adhesive. After it is completely cured, the measurement can be carried out. 5.4
Be particularly careful when sealing the laser rod into the sleeve. Do not damage the anti-reflection film layer on the end face. Use the V-groove to roll the sleeve straight so that the sleeve and the rod are coaxial. No dirt is allowed on the end face of the encapsulated laser rod. 5.2 Install the laser rod from the encapsulation shop into the focusing cavity. 5.3 Cool the lamp and laser rod with soft water. The water overflow should be kept at 15~40℃. 5.4 Use a nitrogen atmosphere laser beam to adjust the reflection light spots of the diaphragms at both ends and the rod to be measured to coincide. 5.5 Turn on the power, light the lamp, and adjust it using the method in 4.5 to minimize the laser threshold. 5.6 Increase the input power, measure the output power with a power meter, draw a laser power characteristic curve, and use the method in 4.7 to calculate the continuous laser threshold and slope efficiency.
5.7 After the input power of 4.5kW stabilizes, measure the output power of the rod. 5.8 After the measurement is completed, the input power should be gradually reduced, the power supply should be turned off, the cooling water should be stopped, and the laser rod to be tested should be taken out. Measurement accuracy
The measurement error of this method is less than ±5%.
Test report content
7.1 Operator's name.
7.2 Measurement date.
7.3 The number and size of the laser rod to be tested.
7.4 The residual reflectivity of the film layer at the end of the laser rod to be tested. 7.5 Measurement results
7.5.1 Continuous laser reading, kw;
7.5.2 Slope efficiency, %;
GB 11297. 5-89
7.5.3 Output power when input power is 4.5kW, W; 7.5.4 Characteristic curve of the measured laser sample. Additional remarks
This standard was drafted by the 11th Research Institute of the Ministry of Machinery and Electronics Industry. The main drafter of this standard is Zhang Peihe.
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