Fixed wavelength laser using multiorder halfwave plate
This patent describes a laser adapted to operate at a constant predetermined wavelength. It comprises: a highly reflective, rear mirror at one end of a laser cavity, an output coupler spaced from and aligned with the rear mirror at an outlet end of the laser cavity, an active laser medium positioned between and in alignment with the rear mirror and the output coupler, a thin film polarizer intermediate the rear mirror and the active laser medium, and a multiorder halfwave plate positioned between and aligned with the rear mirror and the thin-film polarizer, with the halfwave plate designed to rotate incident light beams traveling therethrough by 180{degrees} at the predetermined wavelength and to rotate incident light beams traveling therethrough by an amount other than 180{degrees} at wavelengths other than the predetermined wavelength, and with the thin film polarizer designed to reflect substantially all of the S-polarization of incident light beams, to transmit substantially all of the P-polarization of incident light beams at the predetermined wavelength.
- Assignee:
- II-VI Inc., Saxonburg, PA (USA)
- Patent Number(s):
- US 5012473; A
- Application Number:
- PPN: US 7-450157
- OSTI ID:
- 5046515
- Country of Publication:
- United States
- Language:
- English
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