405 nm SLM Laser

Item Code: 0405L-45A-NI-AT-NF
HP VBG Diode PM fiber
Fiber Termination
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State-of-the-art 405 nm polarization-maintaining (PM) fiber-coupled diode laser, meticulously engineered to meet the standards of quantum cryptography. This laser operates at a single frequency, emitting a 405 nm wavelength beam with unrivaled precision and coherence. What sets it apart is its integrated polarization-maintaining fiber, ensuring the preservation of polarized light throughout your applications. This capability is crucial for quantum key distribution and secure data transmission, setting new benchmarks in data security.

PM fiber-coupled SLM 405 laser is distinguished by a very good beam quality and homogeneity. Integrated power electronics and monolithic fiber attachment make this laser immune to thermal changes in the environment and the output delivers spatially filtered TEM00 polarized radiation.

A core-less end-cap is included for fiber tip protection against optical damage and degradation due to optical radiation.

By default, this type of laser is built with FC/APC connector, but other fiber terminations are available upon request. Details about non-standard connector and the fiber used with it should be discussed with the Integrated Optics sales team.

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.

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

Last edited on: 3 June 2024
Parameter Minimum Value Typical Value Maximum Value
 Central wavelength, nm 404.5 405 405.4
 Spectral line width FWHM, MHz 1 - 20 60
 Output power, mW 2 - 50 -
 Power stability, % (RMS, 8 hrs) 3 0.02 0.1 0.5
 Power stability, % (peak-to-peak, 8 hrs) 4 0.1 1 2.5
 Intensity noise, % (RMS, 20 Hz to 20 MHz) 5 0.1 0.2 0.6
 Side-mode suppression ratio (SMSR), dB 40 50 60
 Longitudinal modes - Single -
 Transversal modes - TEM00 -
 Polarization direction 6 - Aligned within the slow axis of the PM fiber and the key position. -
 Polarization extinction ratio (from PM fiber), dB 13 20 -
 Fiber - PM-S405-XP -
 Fiber length, m 0.95 1 1.1
 Control interface type 7 - UART -
 Operation mode 8 - APC (CW) -
 Modulation bandwidth, MHz 9 - N/A -
 Input voltage, VDC 4.8 5 5.3
 Input current, A - 1.5 -
 Max. power consumption, W 0.4 2 10
 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 -
 External fan control - Yes -
 Overheat protection - Yes -
 Dimensions (WxDxH), mm 10 - 50 x 30 x 18 -
 Storage temperature, °C (non-condensing) -10 - 50
 Net weight, kg 0.1 0.12 0.14
 Laser safety class - 3B -
 RoHS - Yes -
 CE compliance - - General Product Safety Directive (GPSD) 2001/95/EC
- (EMC) Directive 2004/108/EC
 OEM lasers are not compliant with - IEC60825-1:2014 (compliant using additional accessories) -
 Warranty, months (op. hrs) 11 - 14 (10000) -
 Country of origin - Lithuania -
 Spectral line width FWHM, pm 12 - 0.01 0.03

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 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 With possible error of up to ±5°.

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

8 APC - Automatic Power Control.

9 SLM lasers shall not be modulated - use external modulators instead.

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

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

12 Converted from bandwidth value.

Typical spectrum

Typical spectrum of 0405 nm diode laser. Measured with 10 pm resolution.

Spectrum of 405 nm SLM Laser
Typical spectrum with an integrated clean-up filter

Typical spectrum of 0405 nm diode laser with an integrated clean-up filter. Measured with 10 pm resolution.

Spectrum of 405 nm SLM Laser with an integrated clean-up filter

The key dimensions of a fiber-coupled MatchBox.

Drawing of 405 nm SLM Laser
Typical Near Field

Near field beam profile of 405 nm SLM Laser

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.

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