OSA: Measurement of Visible Light Devices for Medical Equipment

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nLED for pulse oximeter

A pulse oximeter is a medical measuring instrument that measures oxygen saturation in blood without collecting blood. Oxygen saturation is measured using the difference in the absorption characteristics of HbO2 (oxyhemoglobin) and Hb (reduced hemoglobin) in blood. Two LEDs with wavelengths of 665 nm and 880 nm are used for this measurement. Since the absorption characteristics of HbO2 and Hb change greatly depending on the wavelength, a LED with a high wavelength accuracy of about ± 0.5 nm is required for accurate measurement of oxygen saturation. The measurement wavelength range and high wavelength accuracy of the applicable models are suitable for measuring LEDs for pulse oximeters.

 

LED for pulse oximeter

Source: Konica Minolta website
https://www.konicaminolta.com/about/research/healthcare/pulse.html

Pulse Oximeter (Konica Minolta)

Source: Konica Minolta website
https://www.konicaminolta.jp/healthcare/products/pulseoximeters/index.html

nLaser for laser treatment equipment

Laser treatment devices use lasers with different wavelengths depending on the treatment target. The laser requires the singularity in wavelength so that it does not affect other parts than the target.

 

Lasers

Wavelength

Applications

Nd:YAG laser

1064 nm

Tattoos, keloids, acne, wrinkles

Laser diode

800 nm

Epilation, surgery, allergic rhinitis

Alexandrite laser

755 nm

Macule, bruise, epilation

Ruby laser

694 nm

Macule, bruises, moles

Dye laser

585 nm

Red bruise, vascular disease

Nd:YAG (SHG)

532 nm

Macule, freckles, red bruise

Laser diode

532 nm

Telangiectasia, hay fever

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