GB/T 39865-2021 in English

VALID

Method for measuring refractive index of uniaxial optical crystals

Issued on:2021-03-09
Implemented on:2021-10-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $160.00
$156.00

Standard No:	GB/T 39865-2021
Document status:	VALID
Title in English:	Method for measuring refractive index of uniaxial optical crystals
Title in Chinese:	单轴晶光学晶体折射率测量方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2021-03-09
Implemented on:	2021-10-01
ICS Classification:	17.180-Optics and optical measurements
Chinese Classification:	Q65-Artificial lens
Professional Classification:	GB-National Standard
Related Keywords:	uniaxial optical crystals refractive index measurement methods uniaxial optical crystals introduction technical background refractive index final refractive index
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《GB/T 39865-2021单轴晶光学晶体折射率测量方法》由TC461（全国人工晶体标准化技术委员会）归口，主管部门为中国建筑材料联合会。

Introduction

Technical Background of the Standard

With the development of cutting-edge fields such as laser technology and quantum communication, the precise measurement of the refractive index of uniaxial optical crystals has become a key link in material characterization. This standard fills the gap in the standardization of high-precision refractive index measurement methods at the 10^-6 level in my country.

Core measurement principle

Parameters	o light measurement	e light measurement
Calculation formula	n_o=sin i_o/sinθ	n_e=sin i_e/sinθ
Refraction angle determination	Large angle of positive uniaxial crystal	Large angle of negative uniaxial crystal
Source of uncertainty	Instrument error (0.000001), repeated measurement error

Key implementation requirements

Sample preparation specifications

Geometric dimensions: 10-20mm right-angle prism, vertex angle 10°-35°
Surface accuracy: incident/exit surface better than 0.2λ (λ=632.8nm)
Optical axis orientation: angle with the normal of the incident surface ≤5′

Typical operation case

Take the measurement of α-BBO crystal as an example: it is necessary to first perform environmental equilibration for 5 hours, use a 532nm laser light source, and take the average value of 6 repeated measurements. The final refractive index should be expressed as n_e=1.6753±0.000002(k=2).

Uncertainty control

The combined uncertainty is calculated using the formula u_n=√(∑(nn)²/[N(N-1)]+u₁₂²), where:

Type A uncertainty: introduced by repeated measurements, N≥6 is recommended
Type B uncertainty: provided by equipment calibration certificate

Industry application recommendations

Laser device manufacturers should establish a constant temperature measurement environment of 21℃±3℃
Scientific research institutions need to regularly calibrate the measurement system with standard quartz samples
Crystal growth units should control processing stress <0.5MPa

More samples: JJG 21-2008 GB 50021-2001(2009) YD/T 3934-2021

Sample only — not a preview of GB/T 39865-2021

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