556 nm Fiber Laser

Features

High output power (2 W)
High reliability
Narrow linewidth (<10 kHz)
Excellent power stability (<1%)
User-friendly interface via IoT technology
4U 19" Rack mount
Certified to IEC 60825-1:2014 safety standards

Applications

Quantum Computing
Cooling
Loading atoms into tweezers and lattices
In-trap cooling during imaging
Low-loss, high-fidelity fluorescence readout of tweezer arrays
Site-resolved single-atom detection
Research

Second-Harmonic Generation (SHG)

QTekLaser^TM 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 periodic poled crystal technology and the associated waveguide technology, nonlinear frequency conversion has become a powerful tool to extend the application scope of fiber lasers. For QTekLaser^TM products, the max power of the converted laser light is constrained by the damage threshold of commercially available nonlinear crystals, which is typically several tens of watts.

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 QTekLaser^TM products via nonlinear frequency conversion. The red-shaded cells represent second-harmonic generation (SHG) and the blue-shaded cells sum-frequency generation (SFG).

Figure 2. QTekLaser^TM fiber laser system with an integrated frequency doubler.

Specifications

Download 556 nm Fiber Laser Specifications

Category	Parameter	Value	Unit
Laser	Wavelength	555.8	nm
	Laser linewidth	<10 kHz	kHz
	Operation mode	CW	/
	Thermal tuning range of seed	0.7	nm
	Max output power	2	W
	Input seed power	5 - 20	mW
	Output 1/e2 beam diameter	1-2	mm
	Beam quality (M2)	<1.1	/
	Relative intensity noise (RIN)	<-130 >10 kHz	dBc/Hz
	Fiber length to chassis	2	m
	Polarization direction	Vertical	/
	Polarization extinction ratio (PER)	>20	dB
	Optical signal-to-noise ratio (OSNR)	>45	dB
Electrical / Cooling	Warm-up time	20	min
	Max power consumption	200	W
	AC power supply voltage	110	V
	Fuse	6.3A, 250VAC, 5X20mm	/
	Remote interlock voltage	3.3	V
	Cooling	Chilled water	/
	Suggested chiller temperature	20	°C
	Chilled water flow rate	>=0.65	GPM
Environmental	Room humidity	30 – 60	%
	Room temperature	17 – 25	°C
	Weight	25 (55)	Kg (lbs)

QTekLaser^TM 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^TM 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-Yb-SHG-556-2-W-2-2.0-2

Laser Type: Seed laser + Yb-doped fiber amp + SHG

Product Selection Guide

Performance

Beam Quality

Figure 3. Beam Quality: 556 nm M² <1.1. M² is fitted to 0.97±0.04 along horizontal direction and 0.96±0.05 along vertical direction.

Beam Profile

Figure 4. Beam Profile 556 nm. 1/e² beam diameter of 1.1 mm horizontally and 1.1 mm vertically.

Laser Power vs. Current

Figure 5. Laser Power vs. Current: 556 nm

Relative Intensity Noise (RIN)

Figure 6. Relative Intensity Noise (RIN): 556 nm <-130 dBc/Hz >10 kHz.

Quantum Applications

At 556 nm, the QTekLaser™ system targets the ¹S₀ → ³P₁ inter combination transition of neutral ytterbium, the narrow "green" line of second-stage laser cooling. Its kHz linewidth and excellent power stability make it ideal for narrow-line magneto-optical trapping (MOT), cooling ytterbium atoms to the low-microkelvin temperatures needed to load high-fidelity optical tweezer arrays and optical lattices. These ultracold, tightly confined atoms are the foundation of neutral-atom quantum computing, quantum simulation, and state-of-the-art optical atomic clocks, where the 556 nm transition also supports precision spectroscopy and clock-state preparation. With its all-fiber architecture and IoT-enabled control, the 556 nm laser delivers the stability and reliability these demanding quantum experiments require.

Mechanical Dimensions

Figure 7. 556 nm fiber laser mechanical dimensions.

Product Photos

Figure 8. 556 nm fiber laser, 4U chassis water cooled.

556 nm fiber laser system 4U chassis back panel water cooled

Figure 9. 556 nm fiber laser, 4U chassis back panel water cooled