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Wavelength converting device, laser, and method to stabilize the wavelength conversion efficiency

A technology of wavelength conversion and conversion efficiency, which is applied in the fields of instruments, optics, nonlinear optics, etc., and can solve the problems that small-sized solid-state semiconductor lasers are difficult to implement

Inactive Publication Date: 2011-04-13
KONINK PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This solution exhibits limited effectiveness and / or is difficult to implement for small-sized solid-state semiconductor lasers

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  • Wavelength converting device, laser, and method to stabilize the wavelength conversion efficiency
  • Wavelength converting device, laser, and method to stabilize the wavelength conversion efficiency
  • Wavelength converting device, laser, and method to stabilize the wavelength conversion efficiency

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Embodiment Construction

[0020] Second order non-linear effects are usually relatively weak, then it is possible to use them to generate a frequency conversion process at a power level suitable for the practical application. In sum and difference frequency mixing (SFM, DFM), two input photons traveling through a nonlinear medium are added or subtracted to a higher or lower energy photon: ω 3 = ω 1 ±ω 2 . when ω 1 = ω 2 = ω, ω 3 = 2ω, the nonlinear susceptibility causes second harmonic generation (SHG). Other types of nonlinear processes, down-conversion or optical parametric generation (OPG), start with one input photon and result in two lower-energy photons. The two generated wavelengths are called signal and idler, with the signal being the shortest one. When a cavity is used to increase efficiency by resonating one or both of the generated fields, the device is called an optical parametric oscillator (OPO).

[0021] In a three-wave nonlinear process, the maximum output power level is obtain...

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Abstract

Proposed is a wavelength converting device (100) comprising a non- linear optical crystal (10) having periodically poled regions (20,30) with alternating polarity. The device (100) is characterized in that the period (41,42) of the poled regions along an axis (X) of the device vary in a direction (Y) perpendicular to the axis. The invention is based on the insight that a poling period corresponds to a given temperature. Thus, providing different poling periods along a direction in the wavelength converting device advantageously allows correlating the position of the device along that direction with a temperature.

Description

technical field [0001] The invention relates to a wavelength conversion device comprising a nonlinear optical crystal having periodically poled regions with alternating polarity. Furthermore, the invention relates to a laser comprising such a wavelength converting device. In addition, the present invention relates to methods of stabilizing the conversion efficiency of such devices. Background technique [0002] An embodiment of a laser and a wavelength conversion device of the aforementioned type is known from US5787102. This document discloses a nonlinear optical device using a periodically poled lithium niobate (PPLN) crystal having regions of alternating polarity, i.e. inverted nonlinear The symbol for the optical coefficient. Dispersion in nonlinear optical materials means that the refractive index n seen by the fundamental wave 1 Different from the refractive index n seen by second harmonic generated light 3 . As a result, the fundamental wave (wavelength λ) trave...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/37
CPCG02F2001/3546G02F1/3775G02F1/3546
Inventor R·A·M·希克梅特
Owner KONINK PHILIPS ELECTRONICS NV