摘要:
Disclosed is an ASE-free continuously tunable external resonator laser in which reduction in tuning range and decrease in O utput are suppressed. The external resonator laser comprises: a fixed support body which has a half mirror that partially reflects incident light and partially t ransmits incident light fixed therein; and a rotatory support body which is rotat ably supported by the fixed support body by way of a shaft, and which has a laser chip that emits light, a collimator lens that collimates light emitted from the laser chip, and a diffraction grating that diffracts light emitted from the la ser chip, fixed therein.
摘要:
Fast wavelenght correction equipment for an electric discharge laser includes at least one piezoelectic drive (80) and a fast wavelength measurement system and a fast feedback response time. In a preferred embodiment equipment is provided to control wavelength on a slow, intermediate amd fast time scales, which vary in range from several milliseconds to a few microseconds respectively. Techniques include a combination of a relatively slow stepper motor (82) and a very fast piezoelectric drive (80) for tuning the laser wavelength using a tuning mirror (14).
摘要:
The invention relates to an High Repetition Rate UV Excimer Laser which includes a source of a laser beam and one or more windows which include magnesium fluoride. Another aspect of the invention relates to an excimer laser which includes a source of a laser beam, one or more windows which include magnesium fluoride and a source for annealing the one or more windows. Another aspect of the invention relates to a method of producing a predetermined narrow width laser beam.
摘要:
An integrated circuit lithograohy technique (pectral engineering) for bandwidth control of an electric discharge laser. A computer models lithographic parameters to determine a desired laser spectrum needed to produce a desired lithographic result. A fast responding tuning mechanism (104) adjusts the center wavelength of laser pulses in a burst of pulses to achieve an integrated spectrum approximating the desired laser spectrum. The laser beam bandwidth is controlled to produce an effective beam spectrum having at least two spectral peaks to produce improved pattern resolution in photo resits film. Line narrowing equipment (106) is provided having at least one piezoelectric drive and a fast banwidth detection control system having a time response of less than about 2.0 millisecond. A wavelength tuning mirror is dithered at dither rates of more than 500 dithers per second in phase with the repetition rate of the laser.