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美国Carpenter技术公司为Coherent激光器公司研制了低膨胀系数的铁、镍、钴棒材。这种高级的因瓦合金32-5因其具有低的热膨胀系数和高热质而用于离子激光装置中的谐振器,保证确定激光器中光学谐振腔镜子的临界准线。 这种因瓦合金是在室温下具有最小的膨胀率的马氏体、奥氏体的固溶合金,含有66％铁、32％镍、5.5％钴,此外添加了少量的锰、硅和碳。该合金在低至-55℃使用温度环境下拥有奥氏体的稳定性及在-55～90℃(-67～200°F)温度范围中的低热膨胀性能。 在离子激光器中,光学谐振腔由平面镜
Carpenter technology company for the United States Coherent laser company developed a low expansion coefficient of iron, nickel, cobalt bar. This advanced Invar 32-5 is used in resonators in ion laser devices due to its low coefficient of thermal expansion and high thermal mass to ensure that the critical line of the optical cavity mirror in the laser is determined. This invar alloy is a martensitic, austenitic solid solution alloy with minimum expansion at room temperature, containing 66% iron, 32% nickel and 5.5% cobalt, with minor additions of manganese, silicon and carbon . The alloy possesses austenitic stability at low service temperatures as low as -55 ° C and low thermal expansion at temperatures in the range of -55 to 90 ° C (-67 to 200 ° F). In ion lasers, the optical cavity consists of a plane mirror