- Gain Medium Tm：YAG
Achieve particle number inversion conditions to produce a laser of 2μm.It is very effective when ablation is performed on the surface of the tissue, and the coagulation is not too deep in the air or in the water. This makes the Tm laser very useful in basic laser surgery.
- L1、L2、L3、L4 lens
L1——a spherical collimating lens、L2——a
cylindrical lens、L3、L4——spherical focusing-lens.
In the Q-switched operation, the repetition rate related to the maximum output energy increase.This can be ascribed to the shortening of the energy storage time at high temperature. For at high temperature, the fluorescence lifetime of Tm3+ will decrease because of strong interaction between Tm3+ ions.
- Output Coupler
The output coupler had a reflectivity of 3% for 2.0 µm laser。
- Concave Mirror
The concave mirror was designed for high transmission at the wavelength of 785 nm and high reflection at the wavelength of 2.0 µm.When the laser acts, most of the energy is first absorbed by the water and the water is heated to expand rapidly. When the temperature rises to the boiling point of the water,the surface tension formed by vaporized bubbles exceeds the maximum tension of the tissue surface, the structure will be completely destroyed, an ablation is ejected out of the tissue surface in an instant.
- Treatment Of Benign Prostatic Gland Hyperplasia
Tm lasers have less thermal damage to the tissue and are safer to operate. And the Tm laser has better cutting, vaporization efficiency and hemostasis. These features make it ideal for prostate surgery.
- Treatment Of Bladder Tumors
The main methods of Tm laser treatment BC include bladder tumor vaporization and bladder tumor removal. Bladder tumor vaporization is particularly useful in elderly patients with low-grade non-muscle invasive bladder tumors. This method can achieve certain efficacy, low risk of complications, and because it does not require general anesthesia, it is suitable for outpatients.
- Application In Urolithiasis
The Tm laser lithotripsy mechanism is a photothermal effect. The mechanism of the photothermal effect is: on the one hand, the stone directly absorbs energy, heats the stone to pulverize it, and on the other hand, the water in the stone is rapidly heated to cause the steam to flow rapidly and destroy the stone.
- High absorption coefficient in water
- Low loss transmission in low hydroxide ion doped fibers
- 2μm in the human eye safety laser band 2μm
- High energy storage
- Small size and light weight