TOPAS-TWINS consists of two independently tunable optical parametric amplifiers (OPAs) integrated into a single housing. Both OPAs share the same white light source to provide excellent stability of both outputs, and CEP stabilized mid-IR pulses in a tuning range of 4.5 – 15 μm.

Both OPAs come with wavelength extension options, covering the wavelength range from 240 nm to 20 μm. Output specifications for each OPA are the same as those of TOPAS-PRIME. The maximum pump pulse energy depends on the pulse duration; see the specifications for more details.

Specifications Notes

TOPAS-TWINS specifications are given for the following pump laser parameters:

800 nm wavelength
1 mJ pulse energy
1 kHz repetition rate
30 – 40 fs pulse duration
Gaussian beam

Note 1: Specifications are given for a single TOPAS-TWINS channel.

Note 2: Specifications depend on pump wavelength and pulse duration. If they differ from the values above, contact sales@lightcon.com.

Note 3: Output pulse energy of each TOPAS-TWINS channel scales linearly in 1 – 3.5 mJ range, provided the device is installed and optimized for particular pump energy. The device has to be re-optimized if the pump energy changes more than 10% from the installation value.

Pump Laser Requirements

Model	TOPAS-TWINS
OPA channel	OPA-1	OPA-2
Pump wavelength	770 – 830 nm
Pump pulse duration (FWHM)	20 – 70 fs	20 – 35 fs	35 – 70 fs
Pump pulse energy	0.15 – 0.8 mJ	0.15 – 2.5 mJ	0.15 – 3.5 mJ
Repetition rate	< 20 kHz ¹⁾
Maximum pump power	15 W into each OPA
Pump polarization	Horizontal
Spectral bandwidth	< 1.2× transform limit
Energy stability	⩽ 1% RMS deviation ²⁾
Stability of pulse duration	⩽ 1% pulse-to-pulse
Pulse front tilt	< 10% of pulse duration
Pulse contrast	< 1: 20
Beam quality (M²)	⩽ 1.3
Beam astigmatism	< 0.15
Input beam spatial profile	Gaussian – Hyper-Gaussian
Intensity modulation	⩽ 15%, no hot spots
Beam pointing stability	< 10 μrad
Beam divergence	< 1.2× diffraction limit
Beam height from optical table	125 – 185 mm from optical table
Beam diameter, 1/e²	< 8.5 mm ³⁾

Maximum repetition rate for DFG1 (NDFG1) option is 1 kHz.
Normalized to average pulse energy, NRMSD.
Optional external telescope can be ordered for the beam diameter of 8.5 – 28 mm.

Output from TOPAS-TWINS (1160 – 2600 nm)

Model	TOPAS-TWINS
Tuning range (Signal and Idler combined)	1160 – 1600 nm (Signal) 1600 – 2600 nm (Idler)
Pulse energy at peak (Signal and Idler combined)	> 250 μJ
Pulse duration	(1 – 1.5)× pump pulse duration @ 1160 – 1550 nm < 2× pump pulse duration @ 1550 – 2600 nm
Time-bandwidth product	< 1
Polarization	Vertical (Signal) Horizontal (idler)
Pulse-to-pulse energy stability	< 3% RMS deviation ¹⁾ @ 1160 – 1550 nm

Normalized to average pulse energy, NRMSD.

VIS-UV Extension Options

Extension	Standard NIRUVIS	Separate mixer stage(s)
Level of computer control	Manual change of wavelength separators
Maximum wavelength range	240 – 1160 nm
Housing	Monolithic housing	No common housing
Number of output ports	4 (wavelength-dependent)

VIS Extension (475 – 1160 nm)

Extension		Standard NIRUVIS	Separate mixer stage
SHI	Tuning range	800 – 1160 nm
	Pulse energy at peak	> 20 μJ	> 15 μJ
	Pulse duration	(1 – 1.5)× pump pulse duration
	Polarization	Vertical
SHS	Tuning range	580 – 800 nm
	Pulse energy at peak	> 30 μJ
	Pulse duration	(1 – 1.5)× pump pulse duration @ 620 – 800 nm
	Polarization	Vertical	Horizontal

Extension		Standard Niruvis
Fresh pump option		Not available
SFI	Tuning range	533 – 600 nm
SFI	Pulse energy at peak	> 30 μJ
SFS	Tuning range	475 – 533 nm
SFS	Pulse energy at peak	> 40 μJ
Pulse duration		(1 – 1.5)× pump pulse duration
Polarization		Vertical

UV Extensions (240 – 480 nm)

Extension		Standard NIRUVIS	Separate mixer stage
FHI	Tuning range	400 – 480 nm
	Pulse energy at peak	> 4 μJ	> 2.5 μJ
	Pulse duration	(1.2 – 2)× pump pulse duration
	Polarization	Horizontal
FHS	Tuning range	290 – 400 nm
	Pulse energy at peak	> 5 μJ
	Pulse duration	(1.2 – 2)× pump pulse duration
	Polarization	Horizontal	Vertical

Extension		Standard NIRUVIS
SH of SFI	Tuning range	266 – 295 nm
	Pulse energy at peak	> 3 μJ
	Pulse duration	(1.2 – 2)× pump pulse duration
	Polarization	Horizontal
SH of SFS	Tuning range	240 – 266 nm
	Pulse energy at peak	> 3 μJ
	Pulse duration	< 3× pump pulse duration
	Polarization	Horizontal

DFG Extension (2600 – 13000 nm)

Extension	NDFG1 ¹⁾	NDFG1K ²⁾	NDFG2
Tuning range	2.6 – 9 μm	2.6 – 4.5 μm	4 – 13 μm
Pulse energy	> 2 μJ @ 4 μm > 0.5 μJ @ 9 μm	> 2 μJ @ 4 μm	> 1 μJ @ 5 μm > 0.1 μJ @ 13 μm
Pulse duration	< 3× pump pulse duration	< 3× pump pulse duration	Not specified
Polarization	Horizontal	Horizontal	Horizontal

Maximum pump repetition rate – 1 kHz. Limited crystal life time of 1000 – 2000 h.
Not available in collinear configuration.