Koheras BASIK single-frequency line card lasers

Features

Ultra-low phase noise and narrow linewidth
Stable single-frequency operation
Industrial OEM packaging
Designed for Multi-channel systems (ACOUSTIK) or stand-alone
Integrated fast wavelength modulation (optional)

This range of lasers offered as compact modules typically for industrial OEM integration. It is also designed as a building block for our ADJUSTIK benchtop systems and the ACOUSTIK multi-channel systems. It is supplied with NKTP CONTROL software for the control and read-out of laser parameters on a pc such as a wavelength, output power, and RIN suppression.

Any interferometric use that requires high-frequency stability or a long coherence length will benefit from this type of laser technology. The typical applications are remote sensing, including seismic sensing, such as oil and gas exploration and exploitation, security (perimeter and pipeline detection), and structural pipeline monitoring.

Furthermore, the low-intensity noise of the lasers combined with the high spectral stability makes them ideal as sources for wind LIDAR systems used for the wind turbine and aerospace industry, as well as for interferometry laser vibrometry sensing systems.

Options
Specifications

Laser models

Model	Standard Wavelength	Other wavelengths	Output power	PM	Fast modulation
X15	1550.12 nm	1535 - 1580 nm	30* mW	Yes	Yes
E15	1550.12 nm	1535 - 1580 nm	40 mW	Optional	Optional
C15	1550.12 nm	1535 - 1580 nm	>10 mW*	Optional	Optional
Y10	1064.00 nm	1030 - 1120 nm	> 10 mW*	Yes	Yes

_{*) Fixed output power (non-adjustable)}

C15: Is a co-doped Erbium/Ytterbium fiber laser for operation in the 1535-1580 nm wavelength range offering the lowest intensity noise (RIN) and is a shot-noise limited fiber laser.

X15/E15: Is an Erbium-doped fiber laser for operation in the 1535-1580 nm wavelength range offering the lowest phase and frequency noise and narrowest linewidth of the entire laser portfolio. It is often deployed for interferometric sensor/remote sensing applications, such as Distributed Acoustic Sensing (DAS), demanding 10s of kilometers of coherence length and ultra-high frequency stability.

Y10: Ytterbium-doped fiber laser system for operation in the 1030-1120 nm wavelength range with narrow linewidth and low-intensity noise. This laser is commonly used for laser stabilization, atomic physics /metrology, spectroscopy, fusion energy, general replacement of conventional Nd:YAG lasers, and many other applications.

Tuning and PM Options

PM operation: The output of the BASIK fiber laser is per default single-mode fiber, however, we always offer a PM (Polarisation Maintaining) option to ensure a fixed orientation of the polarisation. This may be required whenever the laser output needs to be externally modulated or frequency-converted.
Thermal wavelength tuning: The Koheras fiber laser systems are per default thermally tunable to enable the user to match and stabilise the laser at a certain wavelength.
Fast wavelength tuning: This feature can be offered for applications demanding higher wavelength stability than provided by the free-running laser. It enables the laser e.g. to be locked to an external reference such as an atomic transition line or interferometer.

Optical

Model	X15	E15	C15	Y10
Laser emission	CW - inherently single frequency
Beam quality [M²]	< 1.05	< 1.05	< 1.05	< 1.05
Linewidth [kHz] *	< 0.1	< 0.1	< 15	< 20
Max phase noise [dB((Rad/√Hz)/m)]	-105@1 Hz -125@10 Hz -130@100 Hz -128@1 kHz	-90@10 Hz -110@100 Hz -130@20 kHz	-69@10 Hz -89@100 Hz -109@20 kHz	-
Max phase-noise [(µrad/√Hz)/m]	3.1 @1 Hz 0.6@10 Hz 0.3@100 Hz 0.4@1 kHz	32@10 Hz 3.2@100 Hz 0.3@20 kHz	355@10 Hz 36@100 Hz 3.5@20 kHz	-
RIN peak [MHz]	app. 0.7	app. 0.7	app. 1	app. 1.5
RIN level @ peak / 10 MHz [dBc/Hz]	<-100 / <-135		<-120 /<-140	<-105 /<-140
Optical S/N (50 pm res.) [dB]	> 50 (typ. > 55)	> 50 (typ. > 55)	> 65 (typ > 70)
Min thermal wavelength tuning range [pm] *	+/- 125	+/- 350	+/- 350	+/- 240
Total thermal tuning range [pm]	350	1000	1000	680

Options:
Fast wavelength modulation range [GHz]	0.5	8	8	10
Fast wavelength modulation [kHz]	Up to 20
PM output - PER [dB]	> 23
Monitor optical	FC/APC

^{* Lorentzian

** Relative to center wavelength at room temperature. If the laser is operated in very cold or hot environments, this wavelength range is truncated on either the upper or lower side.}

Mechanical / Electrical/Environmental

Power supply requirements [VDC]	12
Power consumption [W]	Typical 4, max 12
Electrical interface	30 pin DIN41612 male
Fast modulation drive voltage	Differential 2x5 V with common-mode voltage at 2.5 V
Connectors	Standard: FC/APC pigtailed Option: Bulkhead/pigtailed FC/APC, SC/APC
Monitor output	Optional
Dimensions (HxWxD) [mm]	22.5x91.2(111)x220
Weight [kg]	0.6
Operating temperature range, module temperature [°C]	15 - 60
Storage temperature [°C]	-20 - 60
Humidity non condensing [%RH]	0-70