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Folded lasers system

A laser system, folding technology, applied in lasers, semiconductor lasers, laser parts and other directions, can solve problems such as reduction, achieve the effect of loose alignment tolerance and minimized temperature gradient

Inactive Publication Date: 2014-05-07
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A temperature gradient across the NLO crystal may result in a reduction in the output power of the green laser (i.e., the output power leaving the NLO crystal)

Method used

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  • Folded lasers system
  • Folded lasers system

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0066] Figure 14 show Figure 11 Lens assembly 30 is shown. In this exemplary embodiment, figure 2 and 3 The lens assembly 30 is optimized to provide an RMS (root mean square) wavefront error (WFE) of less than 0.1λ for a ±200 μm field at a wavelength of 1060 nm at a numerical aperture NA of 0.4, and is optimized to have focal length and thickness The combination makes the optical path length between light source and receiver 9.36mm.

[0067] The radius of curvature of the lens assembly 30 (r 1 , r 2 ), thickness Th (vertex to vertex), and aspheric coefficients are chosen to have the following advantages:

[0068] 1. Minimize coma and astigmatism, (the two most serious aberrations for system performance);

[0069] 2. Obtain a large field of view: the combination of low field aberration and large aperture (for example, NA=0.4) makes the laser system for 400 μm (d =350μm, ±25μm) spacing has good coupling efficiency; and

[0070] 3. Provide the appropriate combination ...

example 2

[0082] Figure 16 Another exemplary lens assembly 30 suitable for use in laser system 10 is shown. Figure 16 The lens assembly 30 has the following features:

[0083] (I) It allows the laser system to be in a coupled cavity state (the OPL between the diode laser and the nonlinear laser system is equal to the OPL of the diode laser, and the error is within + / -0.05mm);

[0084] (II) and with the following parameters: (i) FWD = 0.568 mm; (ii) thickness Th (apex to apex) of 1.82 mm; (iii) focal length: f = 1.4 mm; (iv) glass refractive index N at 1060 nm is 1.784;

[0085] (v) NA=0.4.

[0086] Figure 16 The surface parameters of the lens assembly 30 are given in Table 2 below.

[0087] Table 2

[0088] wavelength

[0089]

example 3

[0091] Figure 17 A lens assembly 30 suitable for use in laser system 10 is shown. figure 2 and 3 The lens assembly 30 has the following features:

[0092] (I) It allows the laser system to be in a coupled cavity state (the OPL between the diode laser and the nonlinear laser system is equal to the OPL of the diode laser, and the error is within + / -0.05mm);

[0093] (II) and with the following parameters: (i) FWD = 1.01 mm; (ii) thickness Th (apex to apex) of 1.578 mm; (iii) focal length: f = 1.789 mm; (iv) glass refractive index N at 1060 nm is 1.5; (v) NA=0.4.

[0094] Figure 17 The surface parameters of the lens assembly 30 are given in Table 3 below.

[0095] table 3

[0096] Aspheric parameters

[0097] Sag

[0098] Sag=Ch^2 / (1+((1-(1+K)×C^2×h^2))^0.5)+A4h^4+A6h^6+…+A16h^16

[0099] h; radius

[0100] wavelength

1060

Lens thickness

1.578

Refractive index at 1060nm

1.502905

focal length

1.789

FWD

...

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Abstract

A folded laser system having an optical axis, the laser system comprising: (I) a coherent light source; (II) a reflector; (III) a lens component situated between the light source and the reflector; and (IV) a non-linear optical crystal, wherein the light source and the non-linear optical crystal are separated by a distance d>50µm. The lens component is positioned to provide a collimated beam when intercepting light from the light source, such that the collimated beam is at an angle T' to the optical axis, the reflector is situated to intercept the collimated beam and to reflect the collimated beam to the non-linear optical crystal through the lens; and the lens component is structured to provide an image on the non-linear optical crystal.

Description

technical field [0001] The present invention relates generally to folded laser systems, and more particularly to folded laser systems with nonlinear optical wavelength conversion, such as frequency doubled green lasers. Background technique [0002] Green laser generation can be achieved by nonlinear frequency doubling of infrared light. Typically, such as Figure 1A As shown, a beam 2 from an infrared diode laser ( 3 ) is directed into a nonlinear optical crystal 4 , such as periodically poled lithium niobate (PPLN), where the beam 2 is converted into green light 5 . [0003] The practical challenges of making such lasers stem from a number of issues. First, because small optical waveguides are used to confine light in both the diode laser and the nonlinear optical crystal, the alignment tolerances of the components (lens, nonlinear crystal, and diode laser) are on the order of tens of microns superior. This presents challenges both to the initial assembly of the laser a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/081
CPCH01S5/0035H01S5/02252H01S5/005H01S5/0427H01S5/1085H01S5/0092G02F1/3775H01S5/02326H01S3/081H01S3/10H01S3/108
Inventor E·阿尔莫里克J·高里尔L·C·小休格斯G·A·皮尔驰
Owner CORNING INC
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