Laser light source

摘要

The present invention relates to a laser light source which reduces wavelength-dependent difference of focal position of condensed light when multicolor light with a wide spectral width is collimated and then condensed. The laser light source incorporates a collimator device, in which an installation position of a collimating lens with respect to a laser light entrance portion is set so that a beam waist position of laser light having passed through the collimating lens shifts closer to the collimating lens with a shorter-wavelength-side wavelength component out of wavelength components included in the laser light.

主权项

1. A laser light source comprising:
a single-mode optical fiber which emits laser light with a spectral width of several hundred nm from a core portion thereof; a collimating lens which collimates the laser light divergently emitted from the single-mode optical fiber; a condensing lens which condenses the laser light collimated by the collimating lens; a laser light entrance portion which sets an entrance position of the laser light emitted from the single-mode optical fiber; and a collimating lens installation portion which fixes the collimating lens, wherein an installation position of the collimating lens with respect to the laser light entrance portion is set so that a beam waist position of the laser light having passed through the collimating lens shifts closer to the collimating lens with a shorter-wavelength-side wavelength component out of wavelength components included in the laser light.