785 nm Laser

Item Code: 0785L-41A-NI-NT-NF

VBG Diode Free-space

Preliminary

Full production

Replacement in due course

Not for new designs

Orders still accepted, deliveries still possible

No more orders accepted

Discontinued

Available (in stock) Not in stock

Description

This 785 nm laser features a single-longitudinal-mode (SLM) and operates in multiple transversal modes. It used mainly in industrial and handheld applications of Raman spectroscopy, where a high-power single-frequency operation is needed without the necessity of sharp focusing.
The transversal modes are distributed in one row, thus the fast axis can be focussed with M² ~1.3, while the slow axis has multiple modes and its focusability is poor - theoretically, it can be focussed to a width of ~50 µm.
This laser is a Volume Bragg Grating (VBG) stabilized diode laser, which is distinguished by high electrical efficiency and exceptional wavelength stability event if the output power is tuned.

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.

Last edited on: 11 April 2024

Parameter	Minimum Value	Typical Value	Maximum Value
Central wavelength, nm	784.5	785	785.5
Longitudinal modes	-	Narrow Spectrum	-
Spectral line width FWHM, pm	30	50	80
Output power, mW	-	1000	1500
Power tuning range, %	10	-	100
Side-mode suppression ratio (SMSR), dB ¹	-	50	-
Power stability, % (RMS, 8 hrs) ²	-	0.1	0.5
Power stability, % (peak-to-peak, 8 hrs) ³	-	2	3
Intensity noise, % (RMS, 20 Hz to 20 MHz) ⁴	-	0.3	1
Transversal modes	-	Multiple	-
Beam diameter at aperture (1/e2), mm	-	0.5 x 2	-
Polarization direction ⁵	-	Horizontal	-
Polarization contrast	1000	1500	-
Control interface type ⁶	-	UART	-
Operation mode	-	APC (CW)	-
Modulation bandwidth, MHz ⁷	-	N/A	-
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	-
Beam height from the base, mm	9.9	10.4	10.9
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	-	4	-
OEM lasers are not compliant with	-	IEC60825-1:2014 (compliant using additional accessories)	-
Country of origin	-	Lithuania	-

¹ Without a clean-up filter installed.

² 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.

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 Noise level is measured with a fast photodiode connected to an oscilloscope. The overall system bandwidth is from 2 kHz to 20 MHz.

⁵ For lasers without integrated optical isolators.

⁶ Break-out-boxes AM-C8 and AM-C3 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.