770 nm Fiber Laser

Product Description

The QTekLaser™ 770 nm Fiber Laser is a high-performance source tailored for atomic physics and quantum research, particularly applications involving potassium transitions, laser cooling, and interferometry. Using advanced Second-Harmonic Generation (SHG), it delivers up to 2 W of narrow-linewidth, polarization-maintaining output at 770 nm. With a compact 3U, 19″ rack-mount chassis, robust beam quality, and an IoT-enabled control system, this laser combines scientific precision with industrial reliability for seamless laboratory integration.

Download 770 nm Fiber Laser Specifications
532 nm 14 W second-harmonic generation (SHG) fiber laser.
Figure 1. QTekLaserTM 770 nm fiber laser.

Features

  • Output power 2 W
  • High reliability with all-fiber design
  •  Narrow linewidth (<20 kHz)
  •  Excellent power stability (<1%)
  •  User-friendly interface via IoT technology
  • 3U 19" Rack mount
  • Certified to IEC 60825-1:2014 safety standards

Applications

  • Quantum computing
  • Quantum sensing
  • Atomic interferometry
  • Laser cooling and trapping 
  • Research

Second-Harmonic Generation (SHG)

QTekLaserTM offers laser systems with extended wavelength range by combining nonlinear frequency conversion technologies. Through second-harmonic generation (SHG) we achieve significant laser power at the visible and NIR regime (figure 2;  red-shaded cells of table 1).  With the development of waveguide technology, nonlinear frequency conversion has become a powerful tool to extend the application scope of fiber lasers.

Wavelength extension of QTekLaser products via nonlinear frequency conversion. The red-shaded cells represent SHG and blue-shaded cells SFG.
Table 1. Wavelength extension of QTekLaserTM products via nonlinear frequency conversion. The red-shaded cells represent second-harmonic generation (SHG) and the blue-shaded cells sum-frequency generation (SFG).
fiber laser system with an integrated frequency doubler
Figure 2. QTekLaserTM fiber laser system with an integrated frequency doubler.

Specifications

Download 770 nm Fiber Laser Specifications
Wavelength770 nm
Output power2 W
Polarization Extinction Ratio (PER)21 dB
Power stability<1%
Laser linewidth<20 kHz
Operating temperature17-25 °C
Cooling modeAir or Water cooling
Beam qualityTEM00, M2 ~1.0
Output modePM780-HP with FC/APC connector
Optical Signal-to-Noise (OSNR)50 dB
Relative Intensity Noise (RIN)<-130 dBc/Hz >10 kHz
Chassis3U or 4U 19" Rack mount
Category Parameter Value Unit
Laser Center wavelength 770.15 nm
Bandwidth > +/-1 nm
Operation mode CW /
Max output power 2 W
Input seed power 2 - 20 mW
Input seed polarization Slow axis or key direction
Output fiber type PM780-HP
Beam quality (M2) <1.1 /
Relative intensity noise (RIN) -130 >10 kHz dBc/Hz
Fiber length to chassis 3 m
Polarization direction Slow axis or key direction /
Polarization extinction ratio (PER) 21.7 dB
Optical signal-to-noise ratio (OSNR) 50 dB
Electrical / Cooling Warm-up time 10 min
Max power consumption 114 W
AC power supply voltage 110 V
Fuse 8A, 250VAC, 5X20mm /
Remote interlock voltage 3.3 V
Cooling Chilled water /
Suggested chiller temperature 21 °C
Chilled water flow rate >=0.65 GPM
Room temperature 17 – 25 °C
Environmental Room humidity 30 – 60 %
Weight 17.9 (39.4) Kg (lbs)
Class 4 Laser

QTekLaserTM 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 QTekLaserTM 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-770-2-A-2-2-0
Laser Type: Seed laser + Er-doped fiber amp + SHG
Product Selection Guide

Performance

Beam Profile

Beam Profile: 770 nm
Figure 3. Beam Profile 770 nm. The beam is collimated with a Thorlabs F220APC-780 collimator, not included. It exhibits an excellent, round Gaussian profile with a 1/e² beam diameter of 1.7  mm.

Laser Power vs. Current 

Laser Power vs. Current: 770 nm 
Figure 4. Laser Power vs. Current 770 nm.

Optical Spectrum

Optical Spectrum: 770 nm SMSR 70 dB
Figure 5. Optical Spectrum: 770 nm OSNR 50 dB

AMO Application
Potassium D1 Atomic Absorption

Potassium D1 atomic absorption
Figure 6. AMO Application: Potassium D1 Atomic Absorption 770 nm.

Relative Intensity Noise (RIN)

770 nm relative intensity noise (RIN)
Figure 7. Relative Intensity Noise (RIN) 770 nm, <-130 dBc/Hz >10 kHz

Polarization Extinction Ratio (PER)

polarization extinction ratio (PER) 770 nm
Figure 8. Polarization Extinction Ratio (PER) 770 nm 21.7 dB.

Mechanical Dimensions

770 nm fiber laser mechanical dimensions, 4U water cooled
Figure 9. 770 nm fiber laser mechanical dimensions, 4U water cooled.
770 nm fiber laser mechanical dimensions, 3U air cooled
Figure 9. 770 nm fiber laser mechanical dimensions, 3U air cooled.

Product Photos

532 nm complete fiber laser system 4U chassis water cooled
Figure11. 770 nm fiber laser 3U chassis air cooled.
532 nm complete fiber laser system 4U chassis back panel water cooled
Figure 12. 770 nm fiber laser 3U chassis back panel air cooled.
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