785 nm SLM Laser

Item Code: 0785L-28A-NI-AT-NF

VBG Diode

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

Polarization maintaining fiber-coupled 785 nm lasers are a perfect choice for high-end Raman microscopy solutions. Highly flexible installation into new and existing PM fiber-based setups ensures a fast transition to a new, more effective solution, both in terms of output power and cost. Unprecedented >80 mW of power out of a PM fiber provides more flexibility in choosing focal spot size, by maintaining perfect spatial resolution. The typical linewidth of <200 MHz leads to high spectral resolution.

As a standard, these lasers are offered with FC/APC connector, however other connector types or a collimator may also be offered at a very competitive cost.

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: 14 November 2023

Parameter	Minimum Value	Typical Value	Maximum Value
Central wavelength, nm	784.9	785	785.1
Longitudinal modes	-	Single	-
Spectral line width FWHM, pm ¹	-	5	1
Output power, mW ²	5	80	90
Side-mode suppression ratio (SMSR), dB	-	50	-
Power stability, % (RMS, 8 hrs) ³	-	0.2	1
Power stability, % (peak-to-peak, 8 hrs) ⁴	-	2	3
Intensity noise, % (RMS, 20 Hz to 20 MHz) ⁵	-	0.25	0.6
Transversal modes	-	TEM00	-
Polarization direction	-	Aligned with the slow axis of the PM fiber and the connector key.	-
Polarization extinction ratio (from PM fiber), dB	20	23	-
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	-

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 20-30 pm resolution instead.

² Output power of FBG lasers can be changed with fairly good repeatability of spectrum.

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.

Typical spectrum

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

Drawing

Typical Near Field

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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.

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.