Medicinal all-solid-state yellow laser

A laser, all-solid-state technology, applied in the field of medical lasers, can solve the problems of low power density, low frequency doubling efficiency, low single pulse energy, etc., and achieve high output power/energy, high power and high energy, and high optical-to-optical conversion efficiency. Effect

Inactive Publication Date: 2010-08-25
SUZHOU INST OF BIOMEDICAL ENG & TECH
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Problems solved by technology

They mainly adopt the following three methods: one is to use more frequency-doubled Raman light methods, including intracavity frequency-doubled Raman light (Efficientdiode-end-pumped actively Q-switched Nd:YAG / SrWO4 / (KTP)yellow laser, "Optics Letters", Vol.34, 2009, 2601-2612) and extracavity frequency-doubled Raman light (Low-threshold, diode end-pumped Nd3+:GdVO4 self-Raman laser, "OpticsMaterials", Vol.29, 2007, 1817-1820), the method of extracavity frequency doubling Raman light has low frequency doubling efficiency due to low power density, so the output power and conversion efficiency of yellow light are low; the method of intracavity frequency doubling Raman light is mostly Using acousto-optic Q-switching to increase the power density of the fundamental frequency light can ensure a high average output power, but the single pulse energy is very low, and it is greatly affected by temperature changes
The second is to use two beams of light and frequency (Intracavity sum-frequency generation of 3.23 Wcontinuous-wave yellow light in an Nd:YAG laser, "Optics Communications", Vol.255, 2005, 248-252), this method has a structure Disadvantages such as complexity, large size, and low efficiency
The third is to adopt the method of frequency doubling outside the infrared optical cavity (Passively Q-switchedNd:YAG / (KTA) laser at 561nm, "Optics Communications", Vol.281, 2008, 4088-4091), this method is simple in structure, but single Pulse energy and average power are low, and high-power and high-energy yellow light output cannot be obtained

Method used

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Examples

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Embodiment 1

[0019] Referring to FIG. 1, a medical all-solid-state yellow light laser includes a pump source system 12, the pump source system 12 mainly includes a laser diode LD1, an optical fiber 2 and a focusing coupling arranged in sequence on an optical path Lens system 3, the working mode of the pumping source system 12 is continuous working mode, the maximum continuous pumping power is 30W, and the output wavelength is 808nm;

[0020] It also includes a Z-shaped resonant cavity device, the Z-shaped resonant cavity device includes a tail mirror 4, a concave folding mirror 6, a yellow light output mirror 7 and a total reflection mirror 9 arranged in sequence in the Z-shaped cavity 13. A laser gain medium 5 is placed between the tail mirror 4 and the concave folding mirror 6, and a Brewster sheet 10 is placed between the concave folding mirror 6 and the yellow light output mirror 7, and the yellow light output mirror 7 and the total reflection mirror A frequency doubling crystal 8 is p...

Embodiment 2

[0032] Substantially the same as Example 1, the differences are as follows:

[0033] (1) The laser gain medium 5 is a single-ended composite growth type Nd:YAG ceramic with a size of 3×3×9mm3 , the front end is a 4mm long undoped YAG ceramic, the doping area is 5mm long, the concentration is 1.1at.%, and the front and rear surfaces are plated with anti-reflection coatings for beams with wavelengths of 808nm, 1064nm, 1123nm and 1320nm. The transmittance for 1123nm and 1064nm beams is greater than 99.8%, and the transmittance for 808nm and 1320nm beams is greater than 98%.

[0034] (2) The frequency doubling crystal 8 is made of lithium triborate (LBO), and the size is 3×3×10mm 3 , the two ends of the crystal are coated with 1123nm and 561nm anti-reflection coatings, and the transmittance is greater than 99.8%; the matching method adopts a type of critical matching, and the cutting angle (θ, φ) is (90°, 7.6°).

Embodiment 3

[0036] Substantially the same as Example 1, the differences are as follows:

[0037] (1) The laser gain medium 5 is a double-ended composite growth type Nd:YAG ceramic with a size of 3×3×11mm 3 , the front and rear ends are respectively 3mm long undoped YAG ceramics, the doping area length is 5mm, the concentration is 1.1at. A film wherein the transmittance for beams of 1123 nm and 1064 nm is greater than 99.8%, and the transmittance for beams of 808 nm and 1320 nm is greater than 98%.

[0038] (2) Frequency doubling crystal 8 is selected from potassium phosphate peptide (KTP), and its size is 3×3×6mm 3 , both ends of the crystal are coated with 1123nm and 561nm anti-reflection coatings, and the transmittance is greater than 99.8%; the matching method adopts the second-class critical matching, and the cutting angle (θ, φ) is (75.4°, 0°).

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Abstract

The invention discloses a medicinal all-solid-state yellow laser. The laser comprises a pumping source system and a Z-shaped resonator device, wherein the pumping source system mainly comprises a laser diode (LD), an optical fiber and a focusing coupling lens system which are sequentially arranged on an optical path; the Z-shaped resonator device comprises a tail mirror, a concave folding mirror, a yellow light output mirror and a total-reflection mirror which are sequentially arranged in a Z-shaped chamber; a laser gain medium is arranged between the tail mirror and the concave folding mirror; a Brewster sheet is arranged between the concave folding mirror and the yellow light output mirror; a doubling frequency crystal is arranged between the yellow light output mirror and the total-reflection mirror; and the temperatures of the laser gain medium and the doubling frequency crystal are controlled by a refrigerating device. The medicinal all-solid-state yellow laser has the advantages of simple structure, small volume, high power/energy, high efficiency and good output stability and can obtain a medicinal laser output in a wave band of 561nm.

Description

technical field [0001] The invention relates to a medical laser, in particular to a medical all-solid-state yellow light laser. Background technique [0002] It is known that lasers in the yellow wavelength band have broad applications in the medical field. In diagnosis, it is ideal for total internal reflection fluorescence imaging (TIRF) systems or flow cytometry; in treatment, it can effectively treat diseases such as port-wine stains, telangiectasia and fundus macular degeneration . [0003] Commonly used yellow lasers include Kr ion laser (568nm), dye laser (577nm) and other lasers, but these lasers all have inherent shortcomings. Kr ion lasers belong to gas lasers, which are large in volume and weight, and consume a lot of power due to low efficiency; dye lasers are liquid lasers, which require frequent dye replacement, which is troublesome to work. Requirements. With the research progress and productization of semiconductor lasers, the research and product develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/17H01S3/06H01S3/042H01S3/10H01S3/081
Inventor 高静武晓东檀慧明位兵戴仙金
Owner SUZHOU INST OF BIOMEDICAL ENG & TECH
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