Intracavity holographic laser mode converter
AssigneeIpg Photonics Corporation
InventorsIvan DIVLIANSKY, Leonid GLEBOV, Lam MACH, Oussama MHIBIK, Nafiseh MOHAMMADDIAN
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Abstract
This invention is a broadband intra cavity laser mode convertor. This is a hologram of a complex phase mask imprinted inside of a volume Bragg grating with wide spectral width recorded in photo-thermo-refractive (PTR) glass. This hologram is a broadband phase converting monolithic device capable of use over a broad wavelength range at high instant and average power because of low absorption coefficient and low nonlinear refractive index of PTR glass. Therefore, it can be used for broadband optical beam transformations and conversion of modes in laser resonators.
Claims20
A laser comprising:
- a resonant cavity configured to generate radiation in a predetermined transverse mode which oscillates in a propagation plane;
- and
- a broadband holographic phase mask (HPM) mounted in the resonant cavity and fabricated with a phase profile which is different from that of the predetermined transverse mode, the HPM being tuned to a Bragg angle so as to diffract a portion of the generated radiation which has a spectral width of up to a bandwidth of the HPM and propagates in a desired transverse mode with the phase profile of the HPM in a diffraction plane extending transversely to the propagation plane.
Dependencies are inferred from the claim text.