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Saturable absorber based on planar optical waveguide and preparation method thereof

A saturable absorption, planar optical waveguide technology, used in lasers, laser parts, semiconductor lasers, etc., can solve the problems of increasing the effective length of light and saturable absorbers, reducing thermal effects, etc., to improve the anti-laser damage threshold. , enhance the modulation depth, avoid the effect of thermal effects

Inactive Publication Date: 2019-10-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of evanescent field not only increases the effective length of light and saturable absorber, but also reduces the thermal effect in the cavity

Method used

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  • Saturable absorber based on planar optical waveguide and preparation method thereof
  • Saturable absorber based on planar optical waveguide and preparation method thereof
  • Saturable absorber based on planar optical waveguide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This example illustrates how to prepare an ITO saturable absorber based on a planar optical waveguide and use it in a 1.5 micron band fiber pulse laser.

[0029] (1) Take 20 microliters of chemically synthesized ITO nanocrystalline toluene solution and drop it on a quartz plate to dry to form a film. Utilize femtosecond laser (220fs, 1300nm, 1kHz) to study the saturation absorption characteristics of ITO thin films by opening Z-scan technology, the results are as follows figure 1 As shown, obvious saturated absorption characteristics can be observed. Such as figure 2 As shown, by studying the relationship between the transmittance and the excitation power, it is confirmed again that the ITO thin film has excellent saturable absorption characteristics.

[0030] (2) if image 3 As shown, the waveguide is formed by etching the PLC chip by PECVD; take 20 microliters of chemically synthesized ITO nanocrystal toluene solution and drop it 10 microns above the waveguide for...

Embodiment 2

[0033] This example illustrates how to prepare an AZO saturable absorber based on a planar optical waveguide, and apply it to a solid-state laser with a wavelength of 1.0 micron to realize Q-switched pulse output.

[0034] (1) Take 20 microliters of chemically synthesized AZO nanocrystal toluene solution and drop it on the upper surface 10 microns away from the waveguide of the PLC chip. After drying, the AZO nanocrystal is covered on the upper surface of the waveguide as a saturable absorber device.

[0035] (2) The saturable absorber device obtained in (1) is integrated into a ring laser cavity to form a pulsed fiber laser (the gain fiber here is a Yb:YAP fiber), and a Q-modulated pulse is obtained under 980nm pumping Output, the laser wavelength is 1060nm, and the pulse width is 2.0 microseconds.

Embodiment 3

[0037] This example illustrates how to prepare an IZO saturable absorber based on a planar optical waveguide by using laser pulse deposition technology, and the working band covers 1.5-3.0 microns.

[0038] (1) Take a PLC chip with a thickness of 2 mm, a length of 10 mm, and a width of 5 mm, wherein the waveguide is formed by etching the PLC chip by PECVD.

[0039] (2) Deposit a layer of IZO nanocrystals at 10 microns above the waveguide of the PLC chip obtained in (1) by laser pulse deposition technology.

[0040] (3) Through the waveguide coupling platform, the PLC chip deposited with IZO nanocrystals and the optical fiber V-groove are coupled together to make an IZO saturable absorber with a planar optical waveguide.

[0041] (4) Based on the Tm-doped fiber, the planar optical waveguide IZO saturable absorber prepared in (2) was integrated into the ring fiber laser cavity, and the Q-switched pulse output in the 2.0 micron band was obtained with a pulse width of 4.0 microsec...

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Abstract

The invention discloses a saturable absorber based on a planar optical waveguide and a preparation method thereof. The saturable absorber is composed of the planar optical waveguide and a metal oxidefilm covering the planar optical waveguide. The planar optical waveguide comprises a PLC chip and a fiber V-groove. The metal oxide includes ITO, FTO, AZO, IZO, GZO, IGZO and transition metal oxides such as Ti, V, Mo, W, etc. The working band of the saturable absorber can cover the visible near infrared band because of different materials of the saturable absorber. The invention provides the brand-new saturable absorber for various pulse lasers and the preparation method thereof. The saturable absorber has the characteristics of simple preparation method, low cost and high laser damage threshold and can be widely used in various lasers such as solid-state lasers, fiber lasers and semiconductor lasers to generate the shortest laser pulses of being up to 100 femtoseconds.

Description

technical field [0001] The invention belongs to the field of pulsed lasers, and in particular relates to a saturable absorber based on a planar optical waveguide and a preparation method thereof. Background technique [0002] Pulsed lasers are widely used in laser manufacturing, medical treatment, and precision spectroscopy. Pulsed lasers can be generated by active and passive modulation, mainly mode-locked and Q-modulated. energy. Active modulation technology is currently mainly realized by introducing an acousto-optic modulator or an electro-optic modulator, while passive modulation includes a Kerr lens and a saturable absorber. At present, introducing a saturable absorber into the laser resonator to achieve pulse output through passive modulation is considered to be the most effective and economical pulse laser generation method. [0003] In most of the current reports, the insertion method of saturable absorbers is generally to cover the end face of the optical jumper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/098H01S5/065
CPCH01S3/1118H01S5/0657
Inventor 张多多刘小峰邱建荣
Owner ZHEJIANG UNIV
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