page_title: Holmium(III) oxide
section_title: Applications
hierarchical_section_title: Holmium(III) oxide / Applications
caption_attribution_description: English: a solution of 4% holmium oxide in 10% perchloric acid, permanently fused into a 1 cm pathlength quartz cuvette. The wavelength values of the transmittance minimum of 14 absorption bands is certified to a wavelength uncertainty of about 0.2 nm, with the actual uncertainty varying with the band and the instrumental spectral bandwidth. The standard is certified for spectral bandwidths from 0.1 nm to 3.0 nm, and for wavelengths from 240 nm to 650 nm.
context_page_description: Holmium(III) oxide, or holmium oxide is a chemical compound of a rare-earth element holmium and oxygen with the formula Ho₂O₃. Together with dysprosium(III) oxide, holmium oxide is one of the most powerfully paramagnetic substances known. The oxide, also called holmia, occurs as a component of the related erbium oxide mineral called erbia. Typically, the oxides of the trivalent lanthanides coexist in nature, and separation of these components requires specialized methods. Holmium oxide is used in making specialty colored glasses. Glass containing holmium oxide and holmium oxide solutions have a series of sharp optical absorption peaks in the visible spectral range. They are therefore traditionally used as a convenient calibration standard for optical spectrophotometers.
context_section_description: Holmium oxide is one of the colorants used for cubic zirconia and glass, providing yellow or red coloring. Glass containing holmium oxide and holmium oxide solutions (usually in perchloric acid) have sharp optical absorption peaks in the spectral range 200-900 nm. They are therefore used as a calibration standard for optical spectrophotometers and are available commercially. As most other oxides of rare-earth elements, holmium oxide is used as a specialty catalyst, phosphor and a laser material. Holmium laser operates at wavelength of about 2.08 micrometres, either in pulsed or continuous regime. This laser is eye safe and is used in medicine, lidars, wind velocity measurements and atmosphere monitoring.
caption: A solution of 4% holmium oxide in 10% perchloric acid, permanently fused into a quartz cuvette as an optical calibration standard
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