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Bonded periodically poled optical nonlinear crystals

A nonlinear crystal and periodic polarization technology, applied in lasers, adhesives, laser components, etc., can solve problems such as low optical damage threshold, increased cost, and limited output power of SHG lasers

Inactive Publication Date: 2012-05-23
C2C晶芯科技公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, relatively long KTP crystals (e.g., 5-10 mm) must be used to achieve high output (e.g., >100 mW) of SHG lasers, which increases laser size and cost
Second, the relatively low photodamage threshold of KTP limits the output power of SHG lasers
Third, KTP is not suitable for UV lasers because it is impossible for KTP to have phase matching conditions for UV generation
[0008] Although the idea of ​​using bonded nonlinear crystals in DPSS SHG lasers has been disclosed, some important questions about nonlinear crystal design have not been resolved, such as, if using periodically poled crystals, how long should we use? Nonlinear crystals and what period should be set

Method used

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  • Bonded periodically poled optical nonlinear crystals
  • Bonded periodically poled optical nonlinear crystals
  • Bonded periodically poled optical nonlinear crystals

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Embodiment Construction

[0022] The present invention solves the above-mentioned problems by the method described below:

[0023] In the first preferred embodiment, as Figure 5 As shown, the preferred length of the bonded nonlinear crystal with QPM structure is shown. In an SHG laser with an intracavity structure, the SH light output from the laser is determined by various factors, such as the length of the bonded nonlinear crystal, the optical power emitted into the laser crystal, and the fundamental frequency confined in the laser cavity The beam diameter of the light. Under ideal conditions, i.e., the nonlinear crystal has no losses and the beam diameter remains constant within the nonlinear crystal at the fundamental wavelength, the longer the nonlinear crystal, the higher the SH optical power we can obtain from the SHG laser. However, the length of nonlinear crystals with QPM structures is limited by the following factors. First, when the nonlinear crystal is bonded to the laser crystal, sinc...

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Abstract

A method for designing optimized length of a nonlinear crystal (3) with a bonded structure is provided. Also provided are a method for forming a short Quasi-Phase Matching (QPM) crystal (3) sandwiched by non-poled nonlinear crystals (2, 4), and a method for designing multiple-section periodically poled nonlinear crystal with a high temperature, while keeping sufficient long crystal length and high conversion efficiency.

Description

technical field [0001] The present invention relates to the design of bonded optical nonlinear crystals based on quasi-phase matching (QPM) techniques, which can be used to generate light in the wavelength range from UV to mid-IR. Background technique [0002] In the process of developing a second harmonic (SHG) laser based on a QPM optical nonlinear crystal, it is necessary to optimize and optimize the packaging of the QPM crystal. In the literature (S.W.Chu et al., "High-Efficiency Inta-cavity Continuous-Wave Green-Light Generation by Quasiphase Matching in Bulk Periodically Poled MgO:LiNbO 3 Crystal", Advances in OptoElectronics, 2008 volume (2008)) discloses an example of a diode-pumped solid-state (DPSS) SHG laser. In this document, the SHG laser consists of a pump laser diode 1, a laser crystal 2, and a QPM crystal 3 and the fiber output coupling mirror 4 is formed as figure 1 shown. The crystal faces of laser crystals and QPM crystals are appropriately coated with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/16H01S5/00H01S3/109H01S3/091
CPCH01S3/0627H01S3/0612H01S3/1673H01S3/09415H01S3/109H01S3/1611H01S3/0405Y10T156/10
Inventor 胡烨梁万国
Owner C2C晶芯科技公司