638 NM SLM LASER (VBG DIODE; FREE-SPACE)

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Item Code:
0638L-21A-NI-NT-NF
Product status:
Full production Product specifications are stable. Delivery time is predictable.
Availability:

Description
638 nm single longitudinal mode laser could be used in micro Raman or shifted excitation Raman differential spectroscopy (SERDS). Together with 633 nm SLM laser it is a perfect match for SERDS. Raman signals can be a lot easier separated from the background noise compared to conventional Raman spectroscopy. Both lasers are VBG stabilized which provides a superior center wavelength tolerance of +/-0.1 nm.

Note:
In optical systems with strong back-reflections (e.g. more than 10%), the laser must be protected by using an optical isolator. Typical applications include interferometry, confocal microscopy (especially working with reflective samples), etc.
Specifications
Last edited on:  20 September 2019
Parameter Minimum Value Typical Value Maximum Value
 Central Wavelength, nm 637.7 637.8 638.1
 Longitudinal modes - Single -
 Spectral line width FWHM, pm - 0.1 1 1
 Output power, mW - 100 2 -
 Side-mode suppression ratio (SMSR), dB 40 50 60
 Power stability, % (RMS, 8 hrs) - 0.2 3 1
 Power stability, % (peak-to-peak, 8 hrs) - 2 4 3
 Noise, % (RMS, 20 Hz to 20 MHz) - 0.25 5 0.6
 Transversal modes - TEM00 -
 Beam Diameter at Aperture (1/e2), mm - 1 -
 Beam divergence (full angle), mrad - 1.1 -
 M2 horizontal axis - 1.2 1.4
 M2 vertical axis - 1.3 1.6
 M2 effective - 1.3 1.6
 Polarization direction - Horizontal 6 -
 Polarization contrast 1000 2000 5000
 Control interface type - UART 0 -
 Operation mode - APC (CW) -
 Modulation bandwidth, MHz - N/A 7 -
 Input voltage, VDC 4.8 5 5.3
 External power supply requirement - +5 V DC, 1.5 A -
 Dimensions, mm - 50 x 30 x 18 8 -
 Beam height from the base, mm 9.9 10.4 10.9
 Heat-sinking requirement, °C/W - 1 -
 Optimum heatsink temperature, °C 15 20 30
 Warm up time, mins (cold start) 0.2 1 2
 Temperature stabilization - Yes -
 Overheat protection - Yes -
 Storage temperature, °C (non-condensing) -10 - 50
 Net weight, kg 0.1 0.12 0.14
 Max. power consumption, W 0.4 2 10
 Warranty, months (op. hrs) - 14 (10000) 9 -
 RoHS - Yes -
 CE compliance - - General Product Safety Directive (GPSD) 2001/95/EC
- (EMC) Directive 2004/108/EC
-
 Laser Safety Class - 3B -
 OEM lasers are not compliant with - IEC60825-1:2014 (compliant using additional accessories) -
 Country of origin - Lithuania -
1 Measured with a scanning Fabry-Perot interferometer having 7.5 Mhz resolution, with scanning frequency of about 10 Hz. Interferometer testing is not provided for each laser being manufactured, the standard test is OSA measurement with 10-20 pm resolution instead.
2 The output power of SLM lasers shall not be tuned and SLM performance is not guaranteed at power ratings other than factory preset. However, the power setting capability is not disabled. External attenuators are recommended instead.
3 The long term power test is carried out at constant laser body temperature (+/-0.1 ‎°C) using an optical power meter with an input bandwidth of 10 Hz. The actual measurement rate has a period of about 20 seconds to 1 minute.
4 The long term power test is carried out at constant laser body temperature (+/-0.1 ‎°C) using an optical power meter with an input bandwidth of 10 Hz. The actual measurement rate has a period of about 20 seconds to 1 minute.
5 Noise level is measured with a fast photodiode connected to an oscilloscope. The overall system bandwidth is from 2 kHz to 20 MHz.
6 For lasers without integrated optical isolators.
0 Break-out-boxes AM-C8 and AM-H10 can be used for conversion of UART communication to either USB or RS232.
7 SLM lasers shall not be modulated - use external modulators instead.
8 Excluding control interface pins and an output window/fiber assembly.
9 Whichever occurs first. The laser has an integrated operational hours counter.
Note: Product specifications are subject to change without prior notice to improve reliability, function or design or otherwise.
Typical spectrum

Spectrum of 638 NM SLM LASER (VBG DIODE; FREE-SPACE)
Typical spectrum of 0638 nm diode laser. Measured with 20 pm resolution.
Typical Near Field

Near field beam profile of 638 NM SLM LASER (VBG DIODE; FREE-SPACE)
Typical near field (0.45 m from output aperture) beam profile. Non-circularized beam of a 0638 nm direct diode laser.
Typical Far Field

Far field beam profile of 638 NM SLM LASER (VBG DIODE; FREE-SPACE)
Typical far field (2.75 m from output aperture) beam profile. Non-circularized beam of a 0638 nm direct diode laser.
Drawing

Drawing of 638 NM SLM LASER (VBG DIODE; FREE-SPACE)
The key dimensions of a free-space MatchBox.