Lead fluoride crystal co-doped with ytterbium and alkaline and preparation method thereof

Abstract

The invention relates to a lead fluoride crystal co-doped with ytterbium and alkaline and a preparation method thereof. The structural formula of the crystal is Ybx: My: PbF2, and the growth method of the crystal includes the following steps: (1) the values of x and y are determined; (2) the raw material is weighed in proportion, is fully and evenly mixed and is pressed into blocks, the blocks are put into an iraurite, platinum or plumbago crucible, PbF2 crystal is adopted as a seed crystal, growth atmosphere is high purity argon or CF4 gas, and melt growth method is adopted. Experiments show that the crystal of the invention has large absorption and emission section, long fluorescence life time and high thermal conduction.

Description

technical field

[0001] The invention relates to a laser crystal material, in particular to a ytterbium-base co-doped lead fluoride crystal and a preparation method thereof. The crystal can be applied to an all-solid-state LD pumped high repetition frequency, high power, tunable or ultra-short pulse laser . Background technique

[0002] Laser technology has developed by leaps and bounds since the invention of the first laser, and has been widely used in industry, medical care, information science, biotechnology and military. The application of laser technology in the national economy has been widely used in medical, communication, printing, and electronic industries. With the increase of laser power, high-energy lasers can be used for cutting, drilling, welding and surface treatment of various materials. Since the laser can act on the workpiece at a long distance, it is suitable for environments that are harmful to human body, such as the dismantling of nuclear power plant ...

Examples

Embodiment 1

[0022] Example 1: Growth of Yb by pulling method 0.03 :Na 0.03 :PbF 2 crystal

[0023] Press YbF 3 , NaF, PbF 2 The molar ratio of 0.03:0.03:1 is used for batching, fully mixed and evenly pressed into blocks, put into a graphite crucible, using PbF 2 The crystal is used as a seed crystal, and the growth atmosphere is CF 4 Protective gas, the pulling speed is 2 mm / hour, the rotation speed is 12 r / min, and after the growth, the cooling rate is 50°C / hour and cooled to room temperature. After the crystal is taken out, it is processed into 10×10×1mm 3 Spectroscopic test of the sample, its absorption spectrum such as figure 1 As shown, the fluorescence spectrum is as figure 2 shown. The test results of Example 1 are listed in Table 1 and compared with Yb:YAG, Yb:CaF 2 performance for comparison.

[0024] The present invention adopts alkali metal ion M (being Na + , K + , Li + ) to balance Yb 3+ Ion-substituted Pb 2+ The resulting system charge imbalance can signific...

Embodiment 2

[0027] Example 2: Growth of Yb by temperature gradient method 0.05 :K 0.05 :PbF 2 crystal

[0028] Press YbF 3 , KF, PbF 2 The molar ratio of 0.05:0.05:1 is used for batching, fully mixed and evenly pressed into blocks, put into a graphite crucible, and PbF is placed at the bottom of the crucible. 2 The crystal is used as a seed crystal, and the growth atmosphere is CF 4 Protective gas, the top of the crucible is covered, the temperature is raised to 820°C at 50°C / hour for 10 hours, and the crystal is grown at a cooling rate of 4°C / hour. After the growth is completed, the cooling rate is 20°C / hour.

Embodiment 3

[0029] Example 3: Growth of Yb by crucible descent method 0.1 :Li 0.2 :PbF 2 crystal

[0030] Press YbF 3 , LiF, PbF 2 The molar ratio is 0.1:0.2:1 for ingredients, fully mixed and evenly pressed into blocks, put into a platinum crucible, and PbF is placed at the bottom of the crucible. 2 The crystal is used as a seed crystal, and the growth atmosphere is CF 4 Protective gas, cover the top of the crucible. The crystal growth temperature gradient was set at 40°C / cm, the crucible was lowered at a rate of 3mm / hour, and after the growth, the temperature was cooled to room temperature at a cooling rate of 40°C / hour.

technical field

[0001] The invention relates to a laser crystal material, in particular to a ytterbium-base co-doped lead fluoride crystal and a preparation method thereof. The crystal can be applied to an all-solid-state LD pumped high repetition frequency, high power, tunable or ultra-short pulse laser . Background technique

[0002] Laser technology has developed by leaps and bounds since the invention of the first laser, and has been widely used in industry, medical care, information science, biotechnology and military. The application of laser technology in the national economy has been widely used in medical, communication, printing, and electronic industries. With the increase of laser power, high-energy lasers can be used for cutting, drilling, welding and surface treatment of various materials. Since the laser can act on the workpiece at a long distance, it is suitable for environments that are harmful to human body, such as the dismantling of nuclear power plant ...

Examples

Embodiment 1

[0022] Example 1: Growth of Yb by pulling method 0.03 :Na 0.03 :PbF 2 crystal

[0023] Press YbF 3 , NaF, PbF 2 The molar ratio of 0.03:0.03:1 is used for batching, fully mixed and evenly pressed into blocks, put into a graphite crucible, using PbF 2 The crystal is used as a seed crystal, and the growth atmosphere is CF 4 Protective gas, the pulling speed is 2 mm / hour, the rotation speed is 12 r / min, and after the growth, the cooling rate is 50°C / hour and cooled to room temperature. After the crystal is taken out, it is processed into 10×10×1mm 3 Spectroscopic test of the sample, its absorption spectrum such as figure 1 As shown, the fluorescence spectrum is as figure 2 shown. The test results of Example 1 are listed in Table 1 and compared with Yb:YAG, Yb:CaF 2 performance for comparison.

[0024] The present invention adopts alkali metal ion M (being Na + , K + , Li + ) to balance Yb 3+ Ion-substituted Pb 2+ The resulting system charge imbalance can signific...

Embodiment 2

[0027] Example 2: Growth of Yb by temperature gradient method 0.05 :K 0.05 :PbF 2 crystal

[0028] Press YbF 3 , KF, PbF 2 The molar ratio of 0.05:0.05:1 is used for batching, fully mixed and evenly pressed into blocks, put into a graphite crucible, and PbF is placed at the bottom of the crucible. 2 The crystal is used as a seed crystal, and the growth atmosphere is CF 4 Protective gas, the top of the crucible is covered, the temperature is raised to 820°C at 50°C / hour for 10 hours, and the crystal is grown at a cooling rate of 4°C / hour. After the growth is completed, the cooling rate is 20°C / hour.

Embodiment 3

[0029] Example 3: Growth of Yb by crucible descent method 0.1 :Li 0.2 :PbF 2 crystal

[0030] Press YbF 3 , LiF, PbF 2 The molar ratio is 0.1:0.2:1 for ingredients, fully mixed and evenly pressed into blocks, put into a platinum crucible, and PbF is placed at the bottom of the crucible. 2 The crystal is used as a seed crystal, and the growth atmosphere is CF 4 Protective gas, cover the top of the crucible. The crystal growth temperature gradient was set at 40°C / cm, the crucible was lowered at a rate of 3mm / hour, and after the growth, the temperature was cooled to room temperature at a cooling rate of 40°C / hour.

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