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Ushio HL63680HD

Ushio HL63680HD Laser Diode, 638nm, 4.2W Power!

New Red Laser Diode with World’s Highest Optical Output Power of 4.2W Pulsed

Ushio Inc. has developed an exciting new red laser diode that achieves the world’s highest optical output power of 4.2 W pulsed*1 at a wavelength of 638nm;*2  the HL63680HD.  It is particularly suitable for use in laser light source projectors.

Ushio has been actively developing red laser diodes for use as light sources for laser projectors for several years. In 2019, the company launched the HL63520HD (wavelength 638nm, pulsed 3.5 W, continuous wave (CW) *3 2.4 W), setting a milestone as the laser diode with the world’s highest optical output power of 3.5 W in pulsed mode, contributing significantly to the proliferation of laser projectors.

The market’s demand for higher power at higher temperatures and increased Wall-Plug efficiency*4 for red laser diodes has grown. Red laser diodes, owing to their material properties, are sensitive to temperature changes, necessitating adequate cooling which results in larger equipment or reduced brightness due to insufficient heat dissipation.

In response to these market needs, Ushio has successfully enhanced performance at higher temperatures by refining and optimising chip structures. This achievement allows the HL63680HD to attain the world’s highest optical output power of 4.2 W in pulsed mode at a high temperature of 45°C, with the world’s highest Wall-Plug efficiency of 45% *2 in 638nm pulsed operation at 25°C.

In recent years, laser light source projectors have gained popularity across various applications, including cinema projectors, laser TVs and home projectors, owing to their capacity for superior colour reproduction and high efficiency. More recently, laser light sources have been under consideration for cutting-edge technologies aimed at enhancing safety in automotive applications such as augmented reality head-up displays (AR-HUD) utilising hologram technology.

download HL63680HD data sheet >


  • World’s highest optical output power of 4.2 W in pulsed mode at a high temperature of 45°C, with a lifetime MTTF, (Mean Time to Failure), exceeding 20,000 hours. This contributes to high brightness of projectors.
  • Achieved the world’s highest wall-plug efficiency of 45% at 25°C in pulsed operation at 638nm. This contributes to lower power consumption and the miniaturisation of projectors.
  • Achieved an optical output power of 3.0 W in continuous wave operation, with a lifetime MTTF exceeding 20,000 hours. Suitable for installation in both pulse and CW-operated projectors.
  • The emitter size and package match that of the previous model (HL63520HD), making it easy to replace.

HL63680HD specifications (Tc=25°C)

Pulse optical output power 4.2 W (Pulse, f=240Hz, duty=40%)
CW optical output power 3.0 W
Wall-Plug efficiency 45 (Pulse, f=240Hz, duty=40% )
Wavelength 638nm
Operating temperature -10°C to 55°C
Beam divergence angle 12°x 30°(FWHM)
Transverse mode Multi transverse mode
Oscillation mode TM mode
Package 9 mm TO-CAN package


*1 Oscillation of optical output power at given repeated intervals
*2 An internal investigation as of January 2024
*3 Continuous oscillation of given optical output power
*4 Ratio of optical output power to input power during pulse operation


Ushio laser diodes

All Ushio high performance laser diodes are available from the Optoelectronics Company. Please contact the Optoelectronics Company to request samples for testing.



Ushio’s laser diode collection offers wavelengths across UV (375–405 nm), red (630–690 nm), and NIR (705–852 nm), with prospective optical output powers from 5 mW to 3,500 mW. Our LD collection has low and high power lasers, with low-operating currents, long lifespans, and efficiency, all while remaining 100% RoHS-compliant.

Ushio’s Epitex division has grown into the largest collection of light emitting diodes on the market. Covering all violet, visible, and infrared wavelengths, from 365 nanometres (nm) to 1,750 nm, this vast catalogue creates a one-stop-shop for single and multi-wavelength LEDs.

https://www.ushio.eu/ , https://swir-led.com/


About The Optoelectronics Company Ltd

The Optoelectronics Company is a manufacturer of custom-designed and standard laser diode modules and laser diode collimators. It is also an authorised distributor and supplier of Ushio Laser Diodes and LEDs, OSRAM laser diodes and Panasonic Aspherical Glass Lenses to customers worldwide.

contact details

For more information about the Optoelectronics Company please visit our website at www.oe-company.com or contact us at: Green End Farm, Wood End Green, Henham, Hertfordshire, CM22 6AY, UK, tel: +44 (0) 1279 851851, email: info@oe-company.com.


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