785 nm Laser

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

HP 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:

Back-reflections to the laser can cause spectral widening or even a COD (Catastrophic Optical Damage) of laser diode facet. In optical systems with significant back-reflections (e.g. more than 0.5%), 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.

Last edited on: 3 June 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.

Typical spectrum

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

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 Laser with an integrated clean-up filter

Drawing

The key dimensions of a free-space MatchBox.

Typical Near Field

Typical near field (0.45 m from output aperture) beam profile. Non-circularized beam of a 0785 nm direct diode laser.

Typical Far Field

Typical far field (1 m from output aperture) beam profile. Non-circularized beam of a 0785 nm direct diode laser.

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Raman Spectroscopy

Raman Spectroscopy is a powerful analytical technique that explores molecular vibrations by measuring inelastic scattering of monochromatic light. It provides valuable insights into molecular structure, composition, and chemical bonding, making it widely used in material science, chemistry, and biology. The unique spectral fingerprints obtained through Raman spectroscopy enable non-destructive and precise identification of substances, making it a versatile tool for research and quality control applications.

Confocal Microscopy

Confocal microscopy is a powerful imaging technique used in biological and materials science research. By employing point illumination and a spatial pinhole, confocal microscopy eliminates out-of-focus light, resulting in sharper, high-resolution images. This method enables three-dimensional imaging of specimens with exceptional optical sectioning, making it valuable for studying biological structures and dynamic processes at the cellular and subcellular levels.

Gas Sensing

None

Quantum Cryptography

Quantum cryptography is a way of securing information using the principles of quantum physics. One method of quantum cryptography is quantum key distribution (QKD), which allows two parties to share a secret key that can encrypt and decrypt messages. QKD uses entangled photons, which are pairs of light particles that have a quantum connection and share the same properties. By measuring the polarization of one photon, the other photon will have the same polarization, even if they are far apart. This way, the two parties can generate a random sequence of bits that form the key. However, to create and send entangled photons from space, they need small lasers that can fit into smallsats.