Foreword
This document is drafted in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents".
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility of identifying patents.
This document is presented by the China Construction Materials Federation.
This document is categorized by the National Technical Committee for the Standardization of Artificial Crystals (SAC/TC 461).
1 Scope
This document describes the measurement method for the optical and laser properties of chromium town co-doped garnet crystals.
This document applies to the measurement of optical and laser properties of chromium town co-doped avionite garnet crystals and crystal elements. The measurement of optical and laser properties of chromium bait co-doped laser glass, chromium bait co-doped laser ceramics and other materials can refer to the implementation.
2 Normative reference documents
The contents of the following documents constitute the essential provisions of this document through the normative references in the text. Among them, note the date of the reference document, only the date of the corresponding version applies to this document; do not note the date of the reference document, its latest version (including all the revision of the list) applies to this document.
GB 7247.1 Safety of laser products Part 1: Equipment classification, requirements
GB/T 11297.1-2017 Laser bar wavefront distortion measurement method
GB/T 15175 Measurement methods for the main parameters of solid-state lasers
GB/T 16601.2 Laser and laser-related equipment laser damage value test method Part 2: value determination
GB/T 27661 Measurement method of the one-way loss coefficient of laser bars
GB/T 27665 Measurement method for the excitation performance of aluminum-doped ammonia baihaibao ah filthy back tendon stele Fenbibiege Aibin partner stone laser bars
GB/T 30902-2014 Determination of impurity elements of inorganic chemical products inductively coupled plasma emission spectrometry (ICP-OES)
GB/T 35118-2017 Measurement method of optical properties of aluminum-doped garnet laser crystal
3 Terminology and definitions
The following terms and definitions are applicable to this document.
4 Symbols and abbreviations
The symbols and abbreviations in Table 1 are applicable to this document.
5 Measurement Requirements
5.1 Measurement conditions
5.1.1 Environment
The measurement environment shall meet the following requirements.
a) Temperature: (22 Shi 6) C .
b) Temperature fluctuation during measurement: ≤ 2C .
c Relative humidity: ≤ 50%.
d) Cleanliness level: better than ISO Class 4.
No significant vibration, airflow, smoke, electromagnetic interference.
5.1.2 Safety
Laser safety measures according to the provisions of GB 7247.1.
5.2 Samples
5.2.1 Sample A
6 Measurement methods
6.1 Dopant concentration
6.1.1 Measurement principle
6.2 Extinction ratio
6.2.1 Measurement principle
The laser crystal to be measured is placed between two parallel polarizers and two orthogonal polarizers, and the test light is incident at one end of the laser crystal to be measured and out at the other end of the laser crystal. When the display value is smallest, the system is orthogonally polarized and the I' is recorded. Then the crystal to be measured is placed in the optical path and the crystal is rotated until the light intensity display value is maximum and the I' is recorded. The extinction ratio is calculated according to equation (13).
6.3 Wavefront aberration
6.3.1 Measurement principle
This method is based on Michelson (Michelson) interferometer measurement principle: a beam of human light into two beams after each is reflected back by the corresponding plane mirror to produce interference. The different light ranges of the two beams in the interference can be achieved by adjusting the length of the interferometric arm and changing the refractive index of the medium, so that different interference patterns can be formed and characterized by the peak-valley deviation of the wavefront distortion after the plane wavefront passes through the laser crystal under test.
6.3.2 Measurement device
A laser interferometer with an operating wavelength of 1 064 nm is used, and the accuracy should not be lower than a/20. 6.3.3 Measurement procedure
Select sample B, and measure the wavefront aberration according to GB/T 11297.1-2017 Chapter 7.
6.5 One-way loss coefficient
6.5.1 Measurement principle
The measurement system of one-way loss coefficient is designed as a ratio measurement between the light intensity of the measurement light path and the reference light path of the dual optical path, and the one-way loss coefficient is calculated according to the formula (32).
6.6 ﹑ laser working wavelength 6.6.1 measurement principle
According to the distribution law of wavelength in a certain space apart, the use of detectors to convert the light signal into electrical signals, light intensity according to the distribution law of wavelength, drawn into the corresponding harmonic line. The maximum light intensity is the working wavelength of the laser of the measured crystal sample. The principle diagram of the measurement is shown in Figure 2.
6.7 Slope efficiency
6.7.1 Measurement principle
The characteristic curves of the laser bar pumping input energy and the laser bar output energy are measured using a flat one-plane resonant cavity. The characteristic curve is made in a right-angle coordinate system with the input energy as the horizontal axis and the output energy as the vertical axis. The intersection of the straight-line extension of the characteristic curve and the input energy axis6 can be used to represent the laser min value of the laser rod; the slope of the straight-line portion of the characteristic curve can be used to represent the slope efficiency of the laser rod, see equation (44), equation (45).
Beam quality factor 6.8
6.8.1 Measurement principle
CCD spot camera is equipped with a detector and conversion circuit, which can convert the laser light Cambodian into a spot image, through the computer program processing can be directly read out the diameter of the light class. Change the camera position, measure 10 groups ~ 20 groups of light diameter (d) and the distance between the focusing lens and the camera (Z), according to the formula (51) for hyperbolic fitting, to get the beam characteristic coefficients A, B and C, beam waist diameter (d and far-field divergence angle (0) are calculated according to the formula (52), formula (53), M2 according to the formula (54).
7 Measurement report content
7.1 Measurement basic information
Measurement of basic information should contain the following.
a) the inspection unit.
b) the date of delivery
c) environmental conditions (including temperature and relative humidity).
d sample number and size specifications.
e) measurement equipment (including the name and model); f) measurement units.
g) measurement of the documents used (including the year of publication or publication number).
h) measurement personnel, measurement date.
i) verification personnel, verification date.
7.2 Measurement results
Measurement results should contain the following.
a) chromium doping concentration and doping bait concentration.
b) extinction ratio.
c) wavefront aberration.
d) Optical uniformity.
e) One-way loss coefficient.
f) Laser operating wavelength.
g) slope efficiency.
h)beam quality factor.
i) laser damage threshold.
7.3 Measurement record and report format
The measurement record and report format are shown in Appendix A.
Attachment A(Informative) Measurement Records and Reports
The format of recording and reporting of measurement data is shown in Table A.1.
Bibliography
Foreword
1 Scope
2 Normative reference documents
3 Terminology and definitions
4 Symbols and abbreviations
5 Measurement Requirements
6 Measurement methods
7 Measurement report content
Attachment A(Informative) Measurement Records and Reports
Bibliography
