Method for preparing praseodymium-doped ion exchange aluminate and germanate glass waveguide

Abstract

The invention discloses a method for preparing a praseodymium-doped ion exchange aluminate and germanate glass waveguide. The method includes melting praseodymium-doped aluminate and germanate glass at first, processing the melted praseodymium-doped aluminate and germanate glass into a glass substrate, evaporating an aluminum coating on the glass substrate, and opening an ion exchange window with the width ranging from 8 micrometers to 50 micrometers on the surface of the glass substrate by micro-machining technique and a wet chemical corrosion method; and soaking the glass substrate in potassium nitrate melted salt or mixed molten salt of silver nitrate and potassium nitrate to exchange ions, washing the melted salt and the aluminum coating which are remained on the surface of the glass substrate, and then polishing the washed glass substrate to obtain the praseodymium-doped ion exchange aluminate and germanate glass waveguide. The method solves the problem that effective radiative transition of rare earth ions cannot be realized due to high energy of phonons of an oxide glass waveguide, and spontaneous radiation fluorescence is continuously amplified by praseodymium ions in a visible light wavelength range for the first time. The method has a good application prospect in fields of minimally-invasive photodynamic cancer therapy, laser, communication, lighting and the like.

Description

technical field [0001] The invention belongs to the field of preparation of rare earth-doped optical devices, and in particular relates to a preparation method of a praseodymium-doped ion-exchanged aluminogermanate glass waveguide. Background technique [0002] Photodynamic therapy, as an emerging and effective method for cancer treatment, is becoming increasingly popular due to its advantages of low toxicity, little damage to normal tissues; cold photochemical reaction, which does not affect other treatments; repeated medication, no drug tolerance, etc. s concern. This method refers to the use of light of appropriate wavelengths under the premise of the presence of oxygen molecules to induce a series of photodynamic reactions of anticancer photosensitive drugs that are preferentially enriched in tumor lesions, and promote the transformation of oxygen molecules into singlet oxygen, thereby destroying tumor tissue. , to kill cancer cells. As a key device for photodynamic th...

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Problems solved by technology

However, these irradiation light sources all have certain deficiencies. Although the laser has the advantages of good monochromaticity and easy transmission through optical fibers, its power density is too high. Once the target positioning error occurs, it will damage human healthy tissues, cause inflammation, Burns and swelling, and the high cost and limited lifespan of lasers make photodynamic therapy equipment expensive to use

Using high-power, multi-wavelength LEDs as irradiation light sources is an effective means of treating skin tumors and skin surface diseases such as port wine stains, acne, and condyloma acuminatum. On the surface of the skin, unable to reach the inside of the body

In addition, the LED light source can only output light of a single central wavelength, which makes it difficult to simultaneously excite several photosensitive drugs, which seriously restricts the therapeutic effect.

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