The main components of a 2.1μm Ho：YAG laser are：
- Gain medium
Achieve particle number inversion conditions to produce a laser of 2.1μm。The absorption coefficient in water of Ho：YAG is high and light can transmit in silicon dioxide fiber.
- A-Q：TeO2
TeO2 is an excellent acousto-optic crystal material, it is widely applied in the production of Acousto-optic modulator.Continuous laser is modulated into lasers with high peak power, narrow pulse width，different frequencies and high repetition rate.
- TFP：thin film polarizer
The thin film polarizer ensures that the polarization of the two pump lights is perpendicular to each other, one beam is p-polarized and one beam is s-polarized.
- Brewster plate
The horizontally polarized light is suppressed and the vertically polarized light is selected to be output.
- MR、HR、OC
MR and HR are highly transparent to the pump light, and the 2.1μm oscillating light is highly reflective. OC, output mirror.
The 2μm laser has a strong absorption peak to water, and water is the main component of biological tissue,so its penetration depth to biological soft tissue is only a few hundred microns. The laser spot is extremely directional and malleable, can ablate a small area,inducing transient condensation of biological proteins, so cut tissue can be quickly hemostasis during surgery. These advantages make 2μm lasers an ideal source for medical surgery.- Treatment Of Dermatological Diseases
Using Ho:YAG laser to treat certain dermatological diseases.It is easy to operate and accurate in positioning. It can not only vaporize, cut tissue, but also has coagulation and hemostasis. It has slight damage to surrounding tissues and quick wound healing.
- Ho Laser Lithotripsy
The pulsed Ho laser is introduced into the body through a cavity lens with a soft fiber to directly break and ablate the stone. High rate of crushed stone, high degree of crushing; Ho laser lithotripsy can also deal with polyps, ureter and urethral stricture, hemorrhage and other soft tissue diseases; short operation time, small tissue damage, less tissue bleeding, less edema, good for postoperative stone removal, cure rate is high.
- Laser Thermokeratoplasty
Using the photothermal effect of the laser to shrink the collagen fibers in the peripheral part of the cornea, and the curvature of the cornea center becomes steep to achieve purpose of hyperopia and hyperopic astigmatism correction.
- High absorption peak to water
- Inducing transient condensation of biological proteins
- High power
- Good beam quality
- Waves can transmit in silicon dioxide fiber
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