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Ultraviolet broadband tuning frequency conversion method, device and laser

A frequency tuning and conversion method technology, applied in the laser field, can solve problems such as the scarcity of nonlinear optical crystals, failure to meet phase matching conditions, and limited laser tuning range, and achieve the effect of wide tuning band and flexible tuning

Pending Publication Date: 2022-04-12
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, limited by the existing nonlinear frequency conversion technology, the currently realized laser tuning range is limited and depends on specific nonlinear optical crystals and specific phase matching forms, especially for ultraviolet bands, suitable nonlinear optical crystals Scarce and generally do not meet the traditional phase-matching criteria

Method used

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  • Ultraviolet broadband tuning frequency conversion method, device and laser
  • Ultraviolet broadband tuning frequency conversion method, device and laser
  • Ultraviolet broadband tuning frequency conversion method, device and laser

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Embodiment 1: Quartz (SiO 2 ) crystal ultraviolet broadband tuned frequency conversion device

[0060] The preparation process of broadband frequency conversion device: such as figure 1 As shown, the ultraviolet nonlinear optical crystal is a quartz crystal, the crystal is cut in the Z direction, and the length is 5mm. In the cutting direction Z direction, the phase grating arranged periodically is processed by ultrafast laser direct writing technology, in which the ordered area and the disordered area The area width is L a = L b = 2.1 μm, the crystal length in the whole processing area is 4.2mm, a total of 1000 phase gratings are set, the crystal cross-section is 4mm×4mm, and the surface of the crystal is polished perpendicular to the Z direction.

[0061] Experimental device such as figure 2 As shown, the pump source 4 is an optical parametric oscillation pulsed laser, the wavelength tuning range is 410nm-2200nm, the pulse width is 10ns, and the repetition freque...

Embodiment 2

[0064] Embodiment 2: boron phosphate (BPO 4 ) crystal ultraviolet broadband tuned frequency converter

[0065] As described in Example 1, the difference is: the nonlinear optical crystal used is boron phosphate (BPO 4 ) crystal, the crystal length is 3.2mm, boron phosphate (BPO 4 ) in each grating period of the crystal, the width of the ordered area and the disordered area are both 1.5 μm, and a total of 1000 phase gratings are processed, and the incident angle of the incident laser is adjusted to meet the phase matching condition, and the ultraviolet wide-band tunable laser can be obtained. The range is 410nm-800nm, the angle tuning range is 0°<θ<84° (0°<φ<90°), and the broadband tuning spectrum range is 205nm-400nm.

Embodiment 3

[0066] Embodiment 3: Lithium triborate (LBO) crystal vacuum deep ultraviolet wideband frequency converter

[0067] As described in Example 1, the difference is: the nonlinear optical crystal used is lithium triborate (LBO) crystal, the crystal is cut along the X direction, and the cutting length is 4mm, boron phosphate (BPO 4 ) The width of the ordered region in each grating period of the crystal is L a =0.96μm, the width of the disordered region is L b =2.88μm; the pump source 4 is an optical parametric amplifier, the wavelength tuning range is 320nm-2600nm, and the repetition frequency is 1MHz; the wavelength range of the incident light wave is 320nm-480nm, and the incident angle of the incident laser light is adjusted to meet the phase matching condition Vacuum deep ultraviolet wide-band tuning spectrum can be obtained in the range of 160nm-240nm.

[0068]Because air has a strong absorption of vacuum deep ultraviolet laser with a wavelength of less than 200nm, the ultr...

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Abstract

The invention discloses an ultraviolet broadband tuning frequency conversion method, an ultraviolet broadband tuning frequency conversion device and an ultraviolet broadband tuning frequency conversion laser, which are characterized in that a nonlinear optical crystal through which ultraviolet penetrates is cut along a certain direction, and phase gratings periodically arranged in an ordered region and a disordered region are processed in the crystal in an ultrafast laser photoetching form; the effective period length of the phase grating is changed by controlling the incident angle of the fundamental frequency light or the temperature of the nonlinear optical crystal, so that the phase difference between the fundamental frequency light and the frequency doubling light or the sum frequency light is adjusted to provide tunable phase compensation, the phase matching condition is met, phase matching in multiple polarization forms can be achieved at the same time, and the polarization effect is improved. Therefore, the ultraviolet broadband tuning frequency conversion is realized, and wavelength and power detection is facilitated; the invention provides a new way for ultraviolet broadband optical frequency conversion, gets rid of the limitation that traditional phase matching depends on a specific polarization direction, makes full use of the pump light source, and has the advantages of high output power, wide tunable wavelength range, no polarization limitation and the like.

Description

technical field [0001] The invention relates to the technical field of lasers, and more specifically relates to a method, device and laser for ultraviolet broadband tuning frequency conversion. Background technique [0002] Nonlinear optical crystals are the core material for the development of laser science and technology, and are widely used in laser frequency conversion and laser modulation; tunable frequency conversion devices use nonlinear optical effects to expand the laser wavelength range and develop various kinds of bands. [0003] Nonlinear frequency conversion must meet the phase matching conditions. Generally speaking, nonlinear optical crystals must first meet three basic conditions: (1) The crystal must be non-centrosymmetric in structure and have second-order nonlinear optical effects; (2) It must be transparent in the applied wavelength band; (3) The nonlinear optical crystal must have a large birefringence to achieve phase matching. [0004] Ultraviolet br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/10H01S3/108H01S3/109H01S3/131
Inventor 于浩海张怀金邵明川
Owner SHANDONG UNIV
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