Buying Frequency Doubling Devices

Laser Technology Redefined

Enhance your laser systems with SHG and FHG technology, converting 1064 nm to 532 nm and further to 266 nm. Achieve high-efficiency green and UV outputs for precision applications in research, industry, and medical fields.

Engineering on Your Wavelength

Covesion manufactures stock and custom free space and fiber coupled tailored to your SHG requirements. Our up-conversion solutions offer exceptional conversion efficiency for Second Harmonic Generation (SHG) of IR to visible and shorter near-IR wavelengths.

Our custom capabilities include:

• free space or fiber coupled solutions
• multiple grating, chirped or fan-out designs
• tailored AR coatings
• custom grating periods and apertures
• 1×1 or 1×0 fiber input/output configurations
• resistive or Peltier temperature control
• integrated or external temperature control
• broad wavelength coverage
• power monitoring, control and output filtering
• compatibility with both CW and pulsed lasers

Change the Color of Light to Expand your Possibilities!

GWU's frequency conversion devices are flexible solutions for pulsed lasers. By means of second harmonic generation (SHG), third harmonic generation (THG) and fourth harmonic generation (FHG), not only the wavelength range but also the versatility of laser sources can be vastly extended. The UHG series offers widely tunable harmonic generation in a compact, modular design for ultrafast laser oscillators. Broadband optics for complete wavelength coverage ensure convenient usability and best performance.

Nonlinear frequency conversion in SHG crystals makes it possible to generate new shorter wavelengths from existing laser wavelengths. As part of our HarmoniXX product line, the HarmoniXX SHG is a frequency converter for the frequency doubling of ultrashort-pulse lasers.

The focus is on user-friendliness and a compact design. By featuring a quick exchange of optics, the HarmoniXX Second Harmonic Generation device can be used for a wide pulse duration range, from femtoseconds (fs) to several picoseconds (ps).

See our specifications for more details.

all wavelengths.

TOPTICA provides frequency-doubled continuous-wave diode and fiber lasers. The wavelength range covers 330 nm – 780 nm with up to 20 nm of tuning. In addition, stand-alone resonant frequency-doubling units are available.

Hangzhou Shalom EO offers a vast selection of nonlinear optical crystals for frequency doubling, also known as second harmonic generation (SHG). Shalom EO supplies different kinds of NLO crystals including BBO crystals, CLBO crystals, KDP and KD^*P, KTA, [PPLN waveguides, LBO, KTP, HGTR KTP, BIBO, LiNbO₃ and MgO:LiNbO₃ crystals, YCOB, in addition to the infrared nonlinear crystals ZnGeP₂ (ZGP) and LiIO₃. Miscellaneous coating options including uncoated, AR, HR, HT, PR coatings, electrodes, and custom coatings are available.

Both off-the-shelf and customized products are available. The crystals can be offered in the form of ingots, blanks, and laser-grade polished elements.

Recent days, Shalom EO launched CLBO (cesium lithium borate) crystals. Processed and polished in low humidity workshop, our CLBO crystals feature excellent performance in UV, vacuum UV (VUV), and deep UV (DUV) wavelength ranges.

Ultra-thin nonlinear crystals for femto-line lasers are also available.

Your reliable partner for photonics innovations!

Our nonlinear crystals for second harmonic generation include a wide choice of BBO, LBO, DKDP, KDP and KTP crystals for quick delivery. We also offer AgGaS₂, AgGaSe₂, GaSe, ZnGeP₂, LiIO₃ and KTA crystals for SHG at IR and mid-IR wavelengths. We also offer technical consulting services helping to choose and specify optimal crystal material, orientation and coating design for your particular application.

Solutions for Innovators

See us at OFC 2025 in San Francisco, April 1–3 (booth 5010)!

The Koheras HARMONIK high-power frequency-converted laser systems are single-frequency, mode-hop-free, and ultra-stable. Engineered for high-power and narrow-linewidth light at precise atomic transitions, they are perfect for quantum applications. Experience excellence with Koheras HARMONIK HP laser systems, ideal for quantum computing, sensing, metrology, and communications. Featuring a robust single-frequency design, low phase and intensity noise, high OSNR, and industrial-grade reliability.

Your trusted value co-creation partner

HC Photonics (HCP) offers both commercial off-the-shelf (COTS) and custom PPMgO:LN or PPMgO:LT based frequency doubling devices for wavelength ranging from 710 nm to 5000 nm.

The product mix includes bare crystals (bulk and waveguide) and plug-and-play fibered mixers. Key features:

• >200 kinds of commercial off-the-shelf (COTS) crystals with oven/holder for shipping today
• wavelength range: 710–5000 nm (355–2500 nm output after doubling)
• fibered mixer is single-pass, high-efficiency and optimized for specified input pumps
• available for fiber or free space as input/output coupling interfaces (such as 1×0, 1×1 or 0×0; 0 = free space, 1 = one fiber)
• >2W CW 780 nm 1×1 fibered waveguide mixer is an excellent device for quantum application
• >4 W visible 1x0 fibered bulk mixer is a robust, compact and easy-to-use device for biophotonics, metrology and quantum applications

Tune your wavelength

Radiantis offers second harmonic generators for MHz repetition-rate femtosecond and picosecond Ti:sapphire oscillators with conversion of efficiencies of 50%. The company also provides femtosecond SHG devices to double the 990 – 1550 nm range into the 495 – 775 nm range. Products are fully automated. Customised frequency doublers for other spectral ranges can also be developed.