CW Laser Wavelength Meter

671 Series CW Laser Wavelength Meter

Wavelength accuracy as high as ± 0.0001 nm
Continuous calibration with built-in wavelength standard
Operation available from 1100 nm to 12 μm
Convenient pre-aligned fiber-optic input for visible and near-IR wavelengths
Free-space aperture input with visible alignment aid for IR and mid-IR wavelengths
Straightforward operation with PC using USB or Ethernet
Display software provided to control measurement parameters and report wavelength data
Automatic data reporting using custom or LabVIEW programming eliminates the need for a dedicated PC
Convenient tablet/smartphone application reports measurement data anywhere in the laboratory
Includes 5 year warranty
New Near Infrared wavelength range 1 um – 2.6um

High guaranteed wavelength accuracy
The 671 Series Laser Wavelength Meter uses proven Michelson interferometer-based technology to accurately measure the wavelength of CW lasers that operate from 375 nm to 12 μm. Two versions are available.

The model 671A is the most precise, measuring wavelength to an accuracy of ± 0.2 parts per million (± 0.0002 nm at 1000 nm). For experiments that are less exacting, the model 671B is a lower-priced alternative with an accuracy of ± 0.75 parts per million (± 0.0008 nm at 1000 nm).

Continuous calibration
To achieve the reliable accuracy you need, the 671 Laser Wavelength Meter is continuously calibrated with a built-in HeNe laser. This is the ideal reference source because its wavelength is well-known and fixed by fundamental atomic structure.

To achieve the highest accuracy, the model 671A uses a single-frequency HeNe laser that is stabilized using a precise balanced longitudinal mode technique. A standard HeNe laser is used as the wavelength reference in the 671B system.

Straightforward operation
The 671 Laser Wavelength Meter operates with a PC connected directly by USB or though a local area network via Ethernet. Software is provided to control measurement parameters and to report wavelength data, or the system can be integrated directly into an experiment using a library of commands for custom or LabVIEW programming. In addition, a browser-based application can be used with a tablet or smartphone to display laser wavelength information anywhere in the laboratory.

Wavelength Range.

The 671A variation can operate from 1100nm – 1μm, in the Visible (375 – 1100 nm), Near Infrared (520 – 1700 nm), Near Infared 2 (1 – 2.6 μm) and the Infrared (1 – 5 μm). Where the 671B can also operate in the Mid-Infrared (1.5 – 12 μm).

Specifications
Model	671A	671B
Laser Type	CW and quasi-CW (repetition rate > 10 MHz)
Wavelength
Range	VIS: 375 – 1100 nm NIR: 520 – 1700 nm NIR2: 1 – 2.6 μm IR: 1 – 5 μm	VIS: 375 – 1100 nm NIR: 520 – 1700 nm NIR2: 1 – 2.6 μm IR: 1 – 5 μm MIR: 1.5 – 12 μm
Accuracy ^{[1], [2]}	± 0.2 ppm ± 0.0002 nm @ 1000 nm ± 0.002 cm-1 @ 10,000 cm-1 ± 60 MHz @ 300,000 GHz	± 0.75 ppm (± 1 ppm for MIR) ± 0.0008 nm @ 1000 nm ± 0.008 cm-1 @ 10,000 cm-1 ± 225 MHz @ 300,000 GHz
Repeatability ^{[3], [4], [5]}	VIS/NIR/NIR2: ± 0.03 ppm (± 0.03 pm @ 1000 nm) IR: ± 0.06 ppm (± 0.2 pm @ 3 μm)	± 0.1 ppm (± 0.1 pm @ 1000 nm)
Calibration	Continuous – built-in stabilised single-frequency HeNe laser	Continuous – built-in standard HeNe laser
Display Resolution	9 digits	8 digits
Units ^[6]	nm, μm, cm-1, GHz, THz
Power (VIS / NIR) 7
Calibration Accuracy	± 15%
Resolution	2%
Units	mW, μW, dBm
Optical Input Signal
Maximum Bandwidth ^[8]	1 GHz	10 GHz
Minimum Input ^{[9], [10]}	VIS: 20 – 250 μW NIR: 10 – 580 μW IR: 65 – 750 μW	VIS: 10 – 110 μW NIR: 10 – 250 μW IR: 65 – 750 μW MIR: 120 – 925 μW
Measurement Rate
Measurement Rate	4 Hz (VIS / NIR) 2.5 Hz (IR)	10 Hz (VIS / NIR) 2.5 Hz (IR / MIR)
Inputs/Outputs
Optical Input^[11]	VIS/NIR: Pre-aligned FC/UPC or FC/APC connector (9 μm core diameter) – optional free beam-to-fi ber couplers IR/MIR: Collimated beam, 2-3 mm diameter aperture, visible tracer beam to facilitate alignment
Instrument Interface	USB and Ethernet interface with Windows-based display program, and browser-based display application Library of commands (SCPI) for custom and LabVIEW programming using any PC operating system
Computer Requirements ^[12]	PC running Windows 10, 1 GB available RAM, USB 2.0 (or later) port, monitor, pointing device
Environmental ^[10]
Warm-Up Time	< 15 minutes	None
Temperature \| Pressure \| Humidity	+15 C to +30 C (-10 C to +70 C storage) \| 500 – 900 mm Hg \| ≤ 90% R.H. at + 40 C (no condensation)
Dimensions and Weight
Dimensions (H x W x D) ^[13]	VIS / NIR: 142 mm x 165 mm x 381 mm IR / MIR: 191 mm x 165 mm x 381 mm
Weight	6.3 kg
Power Requirements	90 – 264 VAC, 47 – 63 Hz, 50 VA max
Warranty	5 Years (parts and labour)

^[1] Defined as measurement uncertainty, or maximum wavelength error, with a confidence level of ≥ 99.7%.
^[2] Traceable to accepted physical standards.
^[3] For 671A, standard deviation for a 10 minute measurement period after the instrument has reached thermal equilibrium.
^[4] For 671B, standard deviation for a 1 minute measurement period after the instrument has reached thermal equilibrium.
Long-term measurement variations due to longitudinal mode drift of the HeNe reference laser are < ± 0.4 ppm.
^[5] Wavelength resolution is approximately two times repeatability.
^[6] Data in units of nm, μm, and cm-1 are given as vacuum values.
^[7] The IR and MIR versions do not measure absolute power. An intensity meter displays relative power.
^[8] Bandwidth is FWHM. When bandwidth is greater, wavelength accuracy is reduced.
^[9] Sensitivity at specific wavelengths can be determined from graphs that are provided in the 671 Series Product Details brochure.
^[10] Characteristic performance, but non-warranted.
^[11] IR and MIR required beam height is 5.4 ± 0.25″.
^[12] For use with Windows-based display program. Interface with SCPI can be done using any PC operating system.
^[13] IR and MIR instrument height is adjustable (7.25 ± 0.25″) for alignment purposes.Bristol Instruments reserves the right to change the specifications as may be required to permit improvements in the design of its products.
Specifications are subject to change without notice.

671 Series CW Laser Wavelength Meter Datasheet
671 Series CW Laser Wavelength Meter Brochure