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Novel medium wave infrared laser crystals of chromium thulium co-doped erbium-activated yttrium aluminate

A technology of infrared laser and yttrium aluminate, which is applied in crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of low energy, high passive loss of laser, and low level

Inactive Publication Date: 2012-07-11
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

[0005] The main limitation of high-efficiency mid-infrared laser output by direct lasing of laser crystals is: due to the low energy of mid-infrared laser photons, it is equivalent to the lattice vibration frequency of many famous laser crystals, that is, the phonon vibration frequency, which leads to Fast non-radiative relaxation competes strongly with lasing emission, thus, leading to high passive loss of lasing
Because water has strong absorption for ~2.7μm laser light source (its absorption coefficient is more than 200 times that of water for ~2.0μm laser light source), so it is very difficult to study laser crystals and their devices in this band , so there are relatively few research reports on this aspect, and the level is not high, especially in China, no systematic research has been seen

Method used

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  • Novel medium wave infrared laser crystals of chromium thulium co-doped erbium-activated yttrium aluminate
  • Novel medium wave infrared laser crystals of chromium thulium co-doped erbium-activated yttrium aluminate
  • Novel medium wave infrared laser crystals of chromium thulium co-doped erbium-activated yttrium aluminate

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Embodiment 1

[0021] Embodiment one: Cr 3+ :Er 3+ : Tm 3+ : YAlO 3 Crystal Growth Preparation

[0022] The instrument used for crystal pulling method growth is DJL-400 intermediate frequency pulling furnace, and the model of intermediate frequency power supply is KGPF25-0.3-2.5. Use Pt / Pt-Rh thermocouple and type 815EPC ohmmeter for temperature control. The crucible used is an iridium crucible of Φ55mm×50mm, and the raw material used is 4N Y 2 o 3 、Cr 2 o 3 、Tm 2 o 3 with analytically pure Al 2 o 3 as raw material. Prepare raw materials according to the following chemical reaction formula:

[0023] (1-y-z)Y 2 o 3 +xCr 2 o 3 +zEr 2 o 3 +yTm 2 o 3 (1-x)Al 2 o 3 →2Y (1-y-z) Cr x T m y Er z al (1-x) o 3 x=1at%~20at%, y=0at%~50at%. Mix the raw materials evenly, press them into flakes, put them into a platinum crucible, put them into a common sintering furnace, slowly raise the temperature to 1080°C at 150°C / h, keep for 48h, repeat ...

Embodiment 2

[0025] Embodiment two: Cr 3+ :Er 3+ :Tm 3+ :YAlO 3 Crystal Laser Experiments

[0026] Process high-quality Cr with a size of 3+ :Er 3+ :Tm 3+ :YAlO 3 The crystal bar device uses a xenon lamp as the pump source for laser experiments. The xenon lamp pumped laser experimental device is attached Figure 4 shown. In the laser experiment, the size of the xenon lamp used is ф6mm×90mm, the pulse width is 220μs, the repetition frequency is 1Hz and 10Hz, the length of the laser resonator is 120mm, and the flat-flat cavity mirror is used. The output mirror and input mirror are between 2.64μm and 2.79 High transmittance in the μm~3.0μm band, high reflection (>99.8%) in the input mirror in the ~2.7μm band, and 5% to 6% transmittance in the output mirror in the ~2.7μm band, the energy probe used plus the filter lens , the filter lens is highly reflective in the 99%), and the transmittance in the >1.8μm band is 75%.

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Abstract

Novel medium wave infrared laser crystals of chromium thulium co-doped erbium-activated yttrium aluminate relate to the field of laser crystal material. The chemical formula of the crystal material is Cr<3+>:Er<3+>:Tm<3+>:YAlO3, the crystal material belongs to an orthorhombic system Pbnm (raletes to a space group), the cell parameter v equals to 198.02 cm<3>, and Dx equals to 5.497 g / cm<3>. Y2O3, Cr2O3, Er2O3 and Tm2O3 of 4N and analytical pure Al2O3 are taken as raw materials, the material of Cr<3+>:Er<3+>:Tm<3+>:YAlO3 is obtained through high-temperature solid phase reaction, and the crystals grow in inert atmosphere by adopting a czochralski method. The novel medium wave infrared laser crystals are used for outputting medium wave infrared band high-efficiency lasers ranging from 2.5 to 3.0 micrometers, and can be applied to the fields such as free space optical communication, remote sensing, airborne infrared pointing disturbance sources, infrared thermal imagers, lidars, remote sensing chemical sensors, topographical surveying, and air-pollution control.

Description

technical field [0001] The invention relates to the field of laser crystal materials. Background technique [0002] The mid-infrared 2.5μm~3μm band laser covers the main optical transmission window of the atmosphere. , and other fields have important applications. For this band of lasers, water vapor and other gases in the atmosphere, including CO, CO 2 and N 2 O, etc., there are strong vibrational absorption peaks, so this band is also called the atmospheric "molecular fingerprint" band. Therefore, this band laser can be widely used to detect low-concentration gas molecules that constitute air pollution and greenhouse gas effects, and play an important role in atmospheric environment monitoring and anti-chemical warfare; it can also be used to monitor human breathing gases and carry out medical research. diagnosis. In addition, the medical application of this band laser also includes tissue cutting and suturing, ophthalmology, neurosurgery, etc. [0003] At present, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/24H01S3/16
Inventor 涂朝阳王燕朱昭捷游振宇李坚富
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI