High power laser converter based on patterned SRB4B07 or PBB407 crystal

Patent metadata

Field	Value
Publication number	US-11719993-B2
Application number	US-201917415090-A
Country	US
Kind code	B2
Filing date	Dec 18, 2019
Priority date	Dec 18, 2018
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

The disclosed laser system is configured with a laser source outputting light at a fundamental frequency. The output light is incident on a frequency converter operative to convert the fundamental frequency to a higher harmonic including at least one frequency converting stage. The frequency converter is based on a SrB 4 O 7 (SBO) or PbB 4 O 7 (PBO) nonlinear crystal configured with a plurality of domains. The domains have periodically alternating polarity of the crystal axis enabling a QPM use and formed with each with highly parallel walls which deviate from one another less than 1 micron over a 10 mm distance.

First claim

The invention claimed is:

1. A laser system, comprising:
a laser source outputting light at a fundamental frequency; and
a frequency converter operative to convert the fundamental frequency into a higher harmonic and including at least one frequency converting stage which is based on a Strontium Tetraborate SrB 4 O 7 (SBO) or Lead Tetraborate PbB 4 O 7 (PBO) crystal, wherein the SBO/PBO crystal is configured with a plurality of uniform domains with defining a periodic structure an having respective periodically alternating polarities of the crystal axis so as to enable quasi-phase-matching (QPM).

2. The laser system of claim 1 , wherein the SBO/PBO crystal is configured to generate the higher harmonic selected from the group consisting of a second harmonic, third harmonic, fourth harmonic, and fifth harmonic and a combination of the higher harmonics.

3. The laser system of claim 2 , wherein the SBO/PBO crystal outputs a single mode light at a wavelength of about 130 nm and average power of at les 10 W at the fourth harmonic.

4. The laser system of claim 1 , wherein the SBO/PBO crystal is configured to provide optical parametric interactions.

5. The laser system of claim 1 , wherein the SBO/PBO crystal has a thickness of each domain for VIS-DUV light ranges varying between 0.2 μm and about 20 μm, and a clear aperture with a diameter ranging from about 1 mm to about 5 cm.

6. The laser system of claim 1 , wherein the laser source includes a laser system operating in a continuous wave (CW), quasi-continuous wave (QCW) or pulsed regime.

7. The laser system of claim 6 , wherein the laser source includes a solid-state laser selected from the group consisting of a fiber laser, yttrium aluminum glass (YAG) and disk laser, the solid state laser being configured with a gain medium doped with light emitting dopants, which are selected from rare-earth elements, and outputting light in a 1 to 2 μm wavelength range.

8. The laser system of claim 6 , wherein the laser source has a master-oscillator (MO) power amplifier (PA) configuration.

9. The laser system of claim wherein 8 , the laser source outputs a train of pulses in a nanosecond-picosecond pulse duration range.

10. The laser system of claim 1 , wherein the frequency converter includes a single, monolithic slab of SBO/PBO crystal formed with two different domain periods, wherein light at the fundamental frequency propagates along a path through the slab which has an upstream end thereof provided with the period for a second harmonic generation (SHG) and a downstream end of the slab having the period for the higher harmonic.

11. The laser system of claim 1 , wherein the uniform domains have highly parallel walls deviating from one another less than 1 μm over a 10 mm distance.

Assignees

• Ipg Photonics Corp

Inventors

• Gapontsev Valentin
• Cherepakhin Aleksander
• Zamkov Anatolii
• Evtikhiev Nikolay
• Perlov Dan
• Zaytsev Aleksander
• Sadovskiy Andrey
• Radionov Nikita

Classifications

• G02F1/39

  for parametric generation or amplification of light, infrared or ultraviolet waves · CPC title

• G02F1/3775

  with a periodic structure, e.g. domain inversion, for quasi-phase-matching [QPM] (G02F1/383 takes precedence) · CPC title

• G02F1/37

  for second-harmonic generation {(G02F1/3532 takes precedence)} · CPC title

• G02F1/3558

  Poled materials, e.g. with periodic poling; Fabrication of domain inverted structures, e.g. for quasi-phase-matching [QPM] · CPC title

• G02F1/3551 Primary

  Crystals · CPC title