Allen David W
National Institute of Standards and Technology, Gaithersburg, MD 20899-8442.
J Res Natl Inst Stand Technol. 2007 Dec 1;112(6):303-6. doi: 10.6028/jres.112.024. Print 2007 Nov-Dec.
Holmium oxide glass has been used as a wavelength standard for over four decades. These standards have shown insignificant spectral variation from batch to batch and from one manufacturer to another. The National Institute of Standards and Technology (NIST) has certified and recertified holmium oxide glass samples for over four decades. Over this period of time there has been no recorded instance of a spectral shift of the certified bands for any of the samples measured. Moreover, these samples are known to be robust and relatively insensitive to a normal range of temperature and humidity. Based on the extensive experience that NIST has with this material and its long-term stability, NIST will no longer recommend the recertification of these standards. Furthermore, traceability may be established either through the supplier or by the end user without the need for NIST involvement.
四十多年来，氧化钬玻璃一直被用作波长标准。这些标准在不同批次之间以及不同制造商之间的光谱变化都不显著。美国国家标准与技术研究院（NIST）对氧化钬玻璃样品进行认证和重新认证已有四十多年。在此期间，没有记录到任何测量样品的认证谱带发生光谱偏移的情况。此外，已知这些样品性能稳定，对正常温度和湿度范围相对不敏感。基于NIST对这种材料的丰富经验及其长期稳定性，NIST将不再建议对这些标准进行重新认证。此外，可通过供应商或最终用户建立溯源性，无需NIST参与。
