Other

Mitutoyo Corporation

Hiroki Masuda

Hisayoshi Sakai

Kaoru Miyata

Yutaka Kuriyama

Jun Ishikawa

Morimasa Ueda

A laser frequency stabilizing device comprises a laser light producer operative to produce and emit a laser light containing a first and a second longitudinal mode light having different wavelengths; a spectrometer operative to spectrally decompose the laser light into the first longitudinal mode light and the second longitudinal mode light; a first detector operative to detect the light output signal from a absorption cell; a second and third detector operative to detect the signal intensity of the first and second longitudinal mode light; an actuator operative to change the resonant cavity length; a first drive controller operative to detect the saturated absorption signal from the light output signal detected at the first detector and control driving the actuator based on the saturated absorption signal; a second drive controller operative to control driving the actuator such that the signal intensity of the first longitudinal mode light detected at the second detector and the signal intensity of the second longitudinal mode light detected at the third detector have a ratio of a certain value; and a switcher operative to switch the control of the detector between the control by the first drive controller and the control by the second drive controller.

Laser frequency stabilizing device, method and program

An optical measuring light path formed by a vacuum-side laser beam (Pa) as a reference standard and an optical measuring light path formed by a gas-side laser beam (Pb) as a dimension to be measured are coaxially located sandwiching a movable end (optical transparent body ) of a vacuum container ( ) in order to satisfy Abbe's principle requiring linear disposition of the reference standard and the dimension to be measured in measurement direction, thereby reducing measurement error in measuring air refractive index and improving measurement accuracy therefor.

Air refractometer

Growing community of inventors

Tsukuba, Japan

Hiroki Masuda