Microstructures of La‐Doped Low Thermal Expansion Cordierite Ceramics

Unno, Hiroto; Toh, Shoichi; Sugawara, Jun; Hattori, Kensaku; Uehara, Satoshi; Matsumura, Shuichi

doi:10.1002/9781118217467.ch15

Cited by 2 publications

(1 citation statement)

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“…NEXCERA does not have a porous microstructure like other ceramics, so a smooth surface with an averaged-roughness of subnm level and a flatness of less than λ/10 can be realized, which is the same as with glass materials [17]. At room temperature, NEXCERA has a zero thermal expansion state due to the negative and positive contributions of the thermal expansion coefficients of cordierite grains and the amorphous layers [18]. It has been reported that ceramic cavities have zero expansion at room temperature and that the zero crossing sensitivity of the CTE is approximately five times larger than that of ULE cavities [19].…”

Section: Introductionmentioning

confidence: 99%

Stable CW laser based on low thermal expansion ceramic cavity with 49 mHz/s frequency drift

et al. 2017

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We describe a CW laser stabilized to a low thermal expansion ceramic cavity which has a lower frequency drift rate than cavities based on ultralow-expansion glass (ULE), which are widely used as optical references. Two identical optical cavities with spacers of different material, ceramic and ULE, were assembled and the optical frequencies locked to each of these cavities were compared. The optical frequency drifts of both CW lasers were measured to within a precision of 10 in one second over the course of one year. The ceramic cavity had a long-term frequency drift rate of 4.9 mHz/s and the ULE cavity had one of 23 mHz/s.

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Section: Introductionmentioning

confidence: 99%