The QTekLaser™ 553 – 628 nm Fiber Laser class combines second-harmonic generation (SHG) and sum-frequency generation (SFG) to deliver stable, single-frequency, polarization-maintaining light up to 6 W. Beam quality is < 1.1 and relative intensity noise stays below -125 dBc/Hz above 10 kHz. An IoT-enabled interface and 19" rack-mount chassis make it straightforward to integrate into quantum and precision-spectroscopy systems.
The wavelength range of QTekLaser™ products can be further extended using the nonlinear processes of second-harmonic generation (SHG) and sum-frequency generation (SFG). The SFG architecture is illustrated in figure 1. The extended wavelength values are summarized in the blue-shaded cells of table 1. This method achieves high power at wavelengths no fiber gain medium reaches directly.
Figure 1. QTekLaser™ sum-frequency generation (SFG) fiber laser system. The frequency sum mixer is integrated into the product.
Output Wavelength Matrix
SF-AMP-Yb2 (506 – 556 nm)
SF-AMP-Tm2 (865 – 1030 nm)
SF-AMP-Yb (1012 – 1112 nm)
SF-AMP-Er (1530 – 1610 nm)
SF-AMP-Tm (1730 – 2060 nm)
SF-AMP-Yb2 (506 – 556 nm)
253 – 278 nm
SF-AMP-Tm2 (865 – 1030 nm)
319 – 361 nm
432 – 515 nm
SF-AMP-Yb (1012 – 1112 nm)
304 – 371 nm
466 – 535 nm
506 – 556 nm
SF-AMP-Er (1530 – 1610 nm)
380 – 413 nm
553 – 628 nm
609 – 658 nm
765 – 805 nm
SF-AMP-Tm (1730 – 2060 nm)
391 – 438 nm
576 – 687 nm
638 – 722 nm
812 – 904 nm
865 – 1030 nm
Table 1. Wavelength extension of QTekLaser™ products via nonlinear frequency conversion. Yb² and Tm² denote frequency-doubled Yb and Tm amplifiers. Red: harmonic generation (SHG, or FHG via two cascaded SHG stages). Blue: sum-frequency generation (SFG), including cascaded SHG+SFG.
QTekLaser™ lasers comply with Federal Regulations (21 CFR Subchapter J, Part 1040) as administered by the Center for Devices and Radiological Health and are certified to IEC 60825-1:2014 standards.
It is the end user's responsibility to ensure that no significant light is retroreflected back into QTekLaser™ systems as this can degrade performance and potentially damage the lasers. To prevent this, the use of an external optical isolator is strongly recommended. Damage due to retroreflected light is not covered under warranty.
Ordering Information
Part Number: QT-LASR-SHG-SFG-(553 – 628)-6-W-2-2.0-2
Figure 3. Beam profile. 1/e² beam diameter 1.3 mm horizontally and 0.9 mm vertically.
Optical Spectrum
Figure 4. Optical spectrum at 6 W, measured with an Anritsu MS9710B optical spectrum analyzer at 0.001 nm resolution. The optical signal-to-noise ratio (OSNR) is 58 dB.
The 553 – 628 nm system delivers 6 W of single-frequency orange-red light for quantum computing and atomic physics. Its output can then be frequency-doubled to 277 – 314 nm.
