Broadband red light generator for RGB display

US10008819B2 · kind B2 · utility

Assignee

• IPG PHOTONICS CORPORATION · US

Inventors

• Manuel J. Leonardo · San Francisco, US
• Igor Samartsev · Westborough, US
• Alexey Avdokhin · Upton, US
• Gregory L. Keaton · San Francisco, US

Key dates

• Filing date: Sep 16, 2015
• Grant date: Jun 26, 2018
• Expiry date: Sep 16, 2035

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01S3/2391
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A broad line red light generator is configured with a single mode (SM) pulsed ytterbium (“Yb”) fiber laser pump source outputting pump light in a fundamental mode (“FM”) at a pump wavelength which is selected from a 1030-1120 nm wavelength range. The disclosed generator further includes a SM fiber Raman converter spliced to an output of the Yb fiber laser pump source. The Raman converter induces an “n” order frequency Stokes shift of the pump light to output the pump light at a Raman-shifted wavelength within 1220 and 1300 nm wavelength range with a broad spectral line of at least 10 nm. The disclosed light generator further has a single pass second harmonic generator (“SHG”) with a lithium triborate (“LBO”) nonlinear optical crystal having a spectral acceptance linewidth which is sufficient to cover the broad spectral line of the pump light. The SHG generates a SM pulsed broad-line red light with a broad spectral line of at least 4 nm.