Wavelength tunable external cavity quantum cascade laser utilizing an angle tuned immersion grating as a wavelength selective filter element
AssigneeAgilent Technologies, Inc.
InventorGuthrie Partridge
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Abstract
A light source having a gain chip, a retro reflecting prism and a first actuator is disclosed. The gain chip amplifies light passing therethrough. The retro reflecting prism is characterized by a pivot axis within the retro reflecting prism, an input light direction, an output light direction, and a diffraction grating that receives light emitted by the gain chip traveling in the input direction, returns a diffracted light beam to the gain chip along the input light direction and generates an output light beam. The first actuator causes the retro reflecting prism to rotate about the pivot axis in response to a control signal being coupled to the first actuator.
Claims10
A light source comprising:
- a gain chip that amplifies light passing therethrough;
- an retro reflecting prism characterized by pivot axis within said retro reflecting prism, an input light direction, an output light direction and a diffraction grating that receives light emitted by said gain chip traveling in said input light direction, returns a diffracted light beam to said gain chip along said input light direction and generates an output light beam;
- and
- a first actuator that causes said retro reflecting prism to rotate about said pivot axis in response to a control signal being coupled to said first actuator.
Dependencies are inferred from the claim text.