Infrared Laser (IR laser) is an electromagnetic wave between microwave and visible laser wavelength, between a wavelength ranges from 760nm to 1mm. IR laser is invisible laser with longer wavelength than red laser light. It covers band of thermal radiation emitted by objects at room temperature. It has better ability of through clouds than visible lasers. Invisible lasers have adapted well in communications, surveillance, detection, medical therapy, military and other aspects etc.

Infrared lasers can detected with optical devices. Usually infrared camera can convert IR laser into visible green laser light, human eyes never see the real infrared light. It has physical properties of thermal effects and strong ability of penetrating clouds.

Classifications:
● Near Infra-red, NIR| 700~ 2,000nm | 0.7~2 MICRON
● Middle Infra-red, MIR| 3,000~ 5,000nm | 3~5 MICRON
● Far Infra-red, FIR| 8,000~14,000nm | 8~14 MICRON

Medical Affects of Infrared Lasers

Infrared laser therapy contains near infrared laser (NIR, IR-A DIN), short wavelength IR laser (SWIR, IR-B DIN), middle wavelength IR laser (MWIR, IR-C DIN), long wavelength IR laser (LWIR, IR-C DIN). Near IR laser (0.76-1.5 microns), penetrates human tissue deeply, about 5mm to 10mm. Far IR laser (1.5-400 microns), mostly absorbed by skin surface, penetrate tissue depth of less than 2mm.
Infrared laser therapy can improve blood circulation, increase phagocytosis, reduce swelling, promote inflammation dissipated, and treat of chronic inflammation.

Infrared laser therapy bases on thermal effects. IR laser radiation can improve tissue temperature, expend telangiectasia, accelerate blood flow, enhance metabolism, and increase tissue ability and regeneration capacity. IR laser can reduce the excitability of the nervous system, analgesic, relieve striated and smooth muscle spasm and promote neurological recovery and so on.

IR laser therapy for chronic infectious wounds and chronic ulcers can improve tissue nutrition, elimination of granulation edema, promote granulation and accelerate wound healing. Infrared radiation can reduce the burn wound exudates. IR laser is also used for contusion treatment, promote tissue swelling and hematoma, dissipation and reduce postoperative adhesions, promote scar softening, and reduce scar contracture.

● IR laser effects on the joints
IR laser can deep penetrate into deep muscle and joint force to make internal body warm, relax muscle, promote the exchange of oxygen and nutrients microvascular network. It has excellent feature of pain relieving.

● IR laser affects on blood
IR laser can penetrate into subcutaneous tissue of body. The utilization of infrared laser reaction can rise temperature of deep subcutaneous skin, expand capillaries, promote blood circulation, resurrection enzymes, strengthen blood and tissue cell metabolism. It makes great help for cell rejuvenate and improve anemia.

● Regulation of blood pressure
Far infrared laser can expand capillaries, promote blood circulation, reduce high blood pressure, and improve the symptoms of low blood pressure. IR laser can also adjust the autonomic nervous system in the best condition.

● IR Laser used in military
IR laser get wide application as night vision illumination. It is very easy to make and produce clear image. Passive infrared laser camera does not emit infrared light, not easy be found by enemy, and have great observation ability to pass through fog, rain etc.
When military army uses IR laser for night vision equipment or devices, solider can find enemy ahead of being detected and fired shots. IR laser is widely used in military, satellite and industry, health, research, surveillance etc.

IR laser danger
IR laser is a thermal radiation source, high temperature can cause serious harm to human. Strong IR laser radiation can cause skin damage, similar to the case of burns, initially burning, and then burning wound.

● Infrared laser hazards to human eyes:
7500~13000 angstroms wavelength infrared laser has high light transmittance of the corner, can cause retina damage. Especially 11,000 angstroms wavelength IR laser has no effect of cornea crystal, but directly cause damage and burn to retina.

Up 19,000 angstroms wavelength infrared laser can almost absorbed by corner, can cause corneal burns of cloudy and white. Up 14,000 angstroms wavelength IR laser most is mostly absorbed by cornea and ocular fluid, through less than iris. Only 13,000 angstroms IR laser can penetrate into iris and cause the iris injury. Human eyes long-term exposure to IR laser can cause cataracts.