785 nm SLM Laser

Item Code: 0785L-23A-NI-AT-NF
VBG Diode SM fiber
Preliminary
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Full production
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Replacement in due course
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Not for new designs
The product is to be discontinued. Please contact us for production plans.
Orders still accepted, deliveries still possible
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Description

Single-frequency (SLM) 785 nm lasers are very popular in Raman spectroscopy. At this wavelength, good fluorescence suppression is observed as many fluorophores simply are not excited in the NIR range. Small footprint and +5VDC (USB typical) operating voltage is exactly what's needed for handheld portable devices. Integrated precision driver electronics ensure low-noise and very stable operation throughout the wide temperature range. 785 near-infrared radiation features low photon energy. VBG technology delivers a low-cost solution to sophisticated Raman spectroscopy needs.

Note:
In optical systems with strong back-reflections (e.g. more than 10%), the laser must be protected by using an optical isolator with at least 20 dB isolation. Typical applications include interferometry, confocal microscopy (especially working with reflective samples), etc. Failure to comply with these requirements will render the warranty void for cases of COD (Catastrophic Optical Damage) of laser diode facets.

Fiber Termination - FC/APC (AT): 8° polishing angle minimizes back reflections from fiber tip. This is necessary especially for SLM lasers.

Last edited on: 24 January 2024
Parameter Minimum Value Typical Value Maximum Value
 Central wavelength, nm 784.7 784.8 785.1
 Longitudinal modes - Single -
 Spectral line width FWHM, MHz 1 - 2 8
 Output power, mW 2 - 80 -
 Side-mode suppression ratio (SMSR), dB - 50 -
 Power stability, % (RMS, 8 hrs) 3 0.02 0.05 0.25
 Power stability, % (peak-to-peak, 8 hrs) 4 0.1 0.3 1
 Intensity noise, % (RMS, 20 Hz to 20 MHz) 5 0.1 0.15 0.6
 Control interface type 6 - UART -
 Operation mode - APC (CW) -
 Modulation bandwidth, MHz 7 - 10 -
 Input voltage, VDC 4.8 5 5.3
 External power supply requirement - +5 V DC, 1.5 A -
 Dimensions (WxDxH), mm 8 - 50 x 30 x 18 -
 Fiber length, m 0.95 1 1.1
 Heat-sinking requirement, °C/W - 1 -
 Optimum heatsink temperature, °C 18 25 32
 Warm up time, mins (cold start) 0.2 1 2
 Temperature stabilization - Internal TEC -
 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) 9 - 14 (10000) -
 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 -
 Spectral line width FWHM, pm 10 - 0.004 0.016

1 Measured using HighFinesse LineWidth Analyzer LWA-10k having 10 kHz resolution. Linewidth Analyzer testing is not provided for each laser being manufactured, the standard test is OSA measurement with 20-30 pm resolution instead.

2 The optical power of SLM lasers shall not be tuned and SLM performance is not guaranteed at power ratings other than the factory preset. However, the power setting capability is not disabled. External attenuators are recommended.

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 Break-out-boxes AM-C8 and AM-C3 can be used for conversion of UART communication to either USB or RS232.

7 TTL digital modulation up to 10 MHz.

8 Excluding control interface pins and an output window/fiber assembly.

9 Whichever occurs first. The laser has an integrated operational hours counter.

10 Converted from bandwidth value.

Typical spectrum

Typical spectrum of 0785 nm diode laser. Measured with 20 pm resolution.

Spectrum of 785 nm SLM Laser
Typical spectrum with an integrated clean-up filter

Typical spectrum of 0785 nm diode laser with an integrated clean-up filter. Measured with 20 pm resolution.

Spectrum of 785 nm SLM Laser with an integrated clean-up filter
Drawing

The key dimensions of a fiber-coupled MatchBox.

Drawing of 785 nm SLM Laser
Typical Near Field

Near field beam profile of 785 nm SLM Laser
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