High-stability heat sink device for lath solid laser crystal

The invention discloses a high-stability heat sink device for a lath solid laser crystal. The high-stability heat sink device comprises a gas cooling box and a supporting device, the two gas cooling boxes are arranged on the left side and the right side of the lath crystal, the four supporting devices are arranged at the four corners of the lath crystal respectively, the two gas boxes are arranged below and above the lath crystal respectively, the two supporting blocks are arranged at the two ends of each gas box respectively, and the supporting blocks of the two gas boxes are arranged at the bottoms of the supporting devices respectively. Two semiconductor coolers are respectively arranged above and below the gas cooling box; a plurality of guide plates and cooling plates are arranged in the gas cooling box at intervals in a staggered manner; by arranging the gas cooling box, gas for suspending the lath crystal is turned and cooled and then is used for cooling the lath crystal, the contact area of the gas an