A Method for Generating Orthogonal Polarization Synchronous Pulsed Laser Based on Double 45°-mgo:ln Cavity Dumping

Abstract

The invention belongs to the field of laser technology, and in particular relates to a dual-45 o ‑MgO:LN cavity-dumped orthogonally polarized synchronous pulse laser generation method. The method includes the following steps: the laser gain medium 3 absorbs the energy of the pump source 2 to generate unpolarized stimulated fluorescent radiation; o ‑MgO: LN4 applies transverse half-wave voltage to control double 45 o ‑MgO:LN birefringence effect separates unpolarized stimulated fluorescence into linearly polarized light, i.e. o-light and e-light. There is a large deviation angle between the two beams, and o-light and e-light are completely separated; the generated s-polarized light and p-polarized light Enter the s-light-polarization cavity emptying device and the p-light-polarization cavity emptying device respectively. Advantages of this method: single block double 45 o ‑MgO:LN produces two beams of polarized light that enter different cavity structures that are empty of the cavity respectively, and output two beams of orthogonal linearly polarized light with narrow pulse width and high peak power synchronously. Electro-optic crystals doped with MgO: LN crystals are laterally modulated, which can increase the length, reduce the thickness and reduce the crystal voltage.

Description

technical field

[0001] The invention belongs to the technical field of lasers, and in particular relates to a high-power, high-efficiency and high-beam-quality method for generating orthogonally polarized synchronous pulse lasers based on double 45°-MgO:LN cavity emptying. Background technique

[0002] Orthogonal dual-polarization lasers can be widely used in lidar, atmospheric detection, military, communication, medical and other fields. At present, most solid-state lasers use polarization devices such as polarizers or double Brewster mirrors to achieve polarized output, but this can only achieve single-polarized output, it is difficult to achieve dual-polarized output, and the extinction ratio of the output polarized light is also very low, very low. It is difficult to achieve the desired effect. Although it is currently possible to use a polarization switch to switch between two beams of vertically-horizontally polarized light, due to the time delay in the switching proc...

Examples

Embodiment 1

[0044] Such as figure 1 As shown in the schematic diagram, the resonant cavity mirror adopts a plano-concave mirror coated with a 1064nm total reflection film (HR, R>99.7%)

[0045] , radius of curvature R=1m; the pump source 808nm laser diode array side pump source; the gain medium is Nd:YAG crystal rod, size Φ4mmX67mm, Nd 3+ The doping concentration is 1.0mol%, and the two ends are coated with a 1064nm high-transparency film (AR, R2 ;; The s-light-total reflection mirror and the p-light-total reflection mirror are all just coated with a flat mirror with a 1064nm high-reflection film (HR, R>99.7%); the s-light-output mirror and p-light-output mirror A flat mirror is adopted, and the transmittance to 1064nm is 20%at; the size of the block MgO:LN crystal is 7mm×7mm×20mm, and the transparent end is coated with a 1064nm high-transparency film, and the doping concentration of MgO is 5.5mol%. Realize 1064nm narrow pulse width and high peak power synchronously pulsed 1064nm laser w...

Embodiment 2

[0047] Same as Example 1, the main difference is that the 808nm laser diode array side pumping source in Example 1 is replaced by 808nm continuous end pumping laser and then enters the resonant cavity through the pump light shaping system to realize 1064nm laser oscillation output.

Embodiment 3

[0049] Replace the two double-cavity emptying optical paths behind the 45°-MgO:LN crystal with two acousto-optic Q-switched optical paths, that is, two acousto-optic modulated orthogonally polarized synchronous pulse lasers can be realized. The advantage is that the cavity structure is simpler compact.

[0050] In summary, the present invention discloses a dual 45°-MgO:LN cavity-dumped orthogonal polarization synchronous pulse laser generation method. The laser device sequentially includes a front cavity mirror, a pump source, a laser gain medium, a double 45° doped magnesium oxide lithium niobate crystal (double 45°-MgO:LN), an s-light-polarization cavity emptying device, and a p Light-polarizing cavity emptying device. Applying a transverse λ / 2 voltage to the double 45°-MgO:LN crystal is used to control synchronous orthogonally polarized pulse output. The s light-polarization cavity emptying device and the p light-polarization cavity emptying device respectively control th...

technical field

[0001] The invention belongs to the technical field of lasers, and in particular relates to a high-power, high-efficiency and high-beam-quality method for generating orthogonally polarized synchronous pulse lasers based on double 45°-MgO:LN cavity emptying. Background technique

[0002] Orthogonal dual-polarization lasers can be widely used in lidar, atmospheric detection, military, communication, medical and other fields. At present, most solid-state lasers use polarization devices such as polarizers or double Brewster mirrors to achieve polarized output, but this can only achieve single-polarized output, it is difficult to achieve dual-polarized output, and the extinction ratio of the output polarized light is also very low, very low. It is difficult to achieve the desired effect. Although it is currently possible to use a polarization switch to switch between two beams of vertically-horizontally polarized light, due to the time delay in the switching proc...

Examples

Embodiment 1

[0044] Such as figure 1 As shown in the schematic diagram, the resonant cavity mirror adopts a plano-concave mirror coated with a 1064nm total reflection film (HR, R>99.7%)

[0045] , radius of curvature R=1m; the pump source 808nm laser diode array side pump source; the gain medium is Nd:YAG crystal rod, size Φ4mmX67mm, Nd 3+ The doping concentration is 1.0mol%, and the two ends are coated with a 1064nm high-transparency film (AR, R2 ;; The s-light-total reflection mirror and the p-light-total reflection mirror are all just coated with a flat mirror with a 1064nm high-reflection film (HR, R>99.7%); the s-light-output mirror and p-light-output mirror A flat mirror is adopted, and the transmittance to 1064nm is 20%at; the size of the block MgO:LN crystal is 7mm×7mm×20mm, and the transparent end is coated with a 1064nm high-transparency film, and the doping concentration of MgO is 5.5mol%. Realize 1064nm narrow pulse width and high peak power synchronously pulsed 1064nm laser w...

Embodiment 2

[0047] Same as Example 1, the main difference is that the 808nm laser diode array side pumping source in Example 1 is replaced by 808nm continuous end pumping laser and then enters the resonant cavity through the pump light shaping system to realize 1064nm laser oscillation output.

Embodiment 3

[0049] Replace the two double-cavity emptying optical paths behind the 45°-MgO:LN crystal with two acousto-optic Q-switched optical paths, that is, two acousto-optic modulated orthogonally polarized synchronous pulse lasers can be realized. The advantage is that the cavity structure is simpler compact.

[0050] In summary, the present invention discloses a dual 45°-MgO:LN cavity-dumped orthogonal polarization synchronous pulse laser generation method. The laser device sequentially includes a front cavity mirror, a pump source, a laser gain medium, a double 45° doped magnesium oxide lithium niobate crystal (double 45°-MgO:LN), an s-light-polarization cavity emptying device, and a p Light-polarizing cavity emptying device. Applying a transverse λ / 2 voltage to the double 45°-MgO:LN crystal is used to control synchronous orthogonally polarized pulse output. The s light-polarization cavity emptying device and the p light-polarization cavity emptying device respectively control th...

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