The pulsed fiber laser have many industrial applications in the field of solar photovoltaic, thin film cutting, sheet material cutting, welding, surface cleaning of materials, fine marking and material deepening, etc.
The STR Series 10-100W Q-Switched Pulse Fiber Laser is the industrial marking and micromachining laser. This series pulse laser has high peak power, high single-pulse energy and optional spot diameter and can be widely applied in the fields, such as marking, precision processing, graphic engraving of non-metal, gold, silver, copper and aluminum with altitude stress resistance, stainless materials without altitude stress resistance. Its marking process features lower cost and more stable performance compared with traditional laser. All components of the 10-100W Q-switched pulse fiber laser are developed by us independently, with high product reliability. And its good compatibility has well recognized by the market and its quality has reached the international advanced leve
Features:
Highly stable laser output
High single-pulse energy
High marking efficiency
Short pulse setup time
High reliability
Maintenance-free operation
Technical specifications:
|
Model |
STR-P10QE |
STR-P20QE |
STR-P30Q |
STR-P50Q |
STR-P50QB |
STR-P100Q |
|
Average output power (W) |
10 |
20 |
30 |
50 |
50 |
100 |
|
Central wavelength |
1064 |
|||||
|
Pulse repetition rate (kHz) |
20-60 |
30-60 |
50-100 |
20-200 |
||
|
Output power stability |
<3% |
<5% |
||||
|
Output beam diameter (mm) |
7±1 |
6.5±1 |
||||
|
Polarization |
Random |
|||||
|
Pulse width (ns) |
80-100 |
90-130 |
90-150 |
50-130 |
||
|
Maximum pulse energy (mJ) |
0.5 |
1 |
||||
|
Delivery cable length (m) |
2 |
|||||
|
Power supply (VDC) |
24 |
|||||
|
Power range (%) |
10-100 |
|||||
|
Power consumption (W) |
120 |
170 |
240 |
340 |
340 |
450 |
|
Size (mm) |
391x260x120 |
396x360x123 |
391x260x120 |
396x360x123 |
||
|
Cooling |
Air |
|||||
|
Operation temperature (°C) |
0-40 |
|||||
|
Pulsed fiber laser |
STR-P20QB |
STR-P30QB |
|
Wavelength(nm) |
1060~1085 |
1060~1085 |
|
Polarization |
Random |
Random |
|
Optical isolator |
Yes |
Yes |
|
Nominal average output power (W) |
≥20 |
≥30 |
|
Single pulse energy (mJ) |
1@20kHz |
1@30kHz |
|
Beam quality(M2) |
<1.5 |
<1.5 |
|
Beam Diameter(mm) |
7±1 |
7±1 |
|
Pulse duration(ns) |
<120@20kHz |
<120@30kHz |
|
Pulse repetition rate(kHz) |
20 - 60 |
30 - 60 |
|
Output Power Tunability(%) |
10-100 |
10-100 |
|
Output Fiber Cable length(m) |
2.0 |
2.0 |
|
Working voltage(VDC) |
24±1 |
24±1 |
|
Power consumption(W) |
200@20℃ |
300@20℃ |
|
Cooling |
Forced Air Cooled |
Forced Air Cooled |
|
Dimension W×D×H(mm) |
215×286×95 |
215×286×95 |
|
Operating temperature(℃) |
0～40 |
|
|
Store temperature(℃) |
-20～60 |
|
|
Operating Humidity(%) |
≤80% |
|
|
Model |
STR-P20QS |
STR-P30QS |
|
Average output power (W) |
≥20 |
≥30 |
|
Central wavelength |
1064 |
1064 |
|
Pulse repetition rate (kHz) |
30 - 60 |
40 - 60 |
|
Output power stability |
<3% |
<3% |
|
Output beam diameter (mm) |
6-8 |
6-8 |
|
Polarization |
Random |
Random |
|
Pulse width (ns) |
110-140 @30kHz |
130-150 @40kHz |
|
Maximum pulse energy (mJ) |
0.67 |
0.75 |
|
Beam quality (M2) |
<1.5 |
<1.6 |
|
Power supply (VDC) |
24±1 |
24±1 |
|
Power range (%) |
10-100 |
10-100 |
|
Power consumption (W) |
200@20℃ |
300@20℃ |
|
Size (mm) |
290*215*95 |
290*215*95 |
|
Cooling |
Air |
Air |
|
Operation temperature (°C) |
0～40 |
0～40 |
Remarks: STR-PQE, -P20QS and –P30QS are economic versions. Others are high-quality versions.
The brand-new short pulse fiber laser Series has a variety of pulse width options, including high average power (10-2000W), high-peak power (≤15kW) and 2-350ns, adjustable repetition frequencies of 10-1000kHz, short pulse setup time (≤100µs), online modifiable pulse width and other characteristics. It is ideal for industrial applications in the field of solar photovoltaic, thin film cutting, sheet material cutting, welding, surface cleaning of materials, fine marking and material deepening, etc.
Features:
Common control interface
Extremely wide operating frequency range
A variety of pulse width options
Online modifiable pulse width
Short pulse setup time
High light beam quality
Air cooling design
Technical specifications:
|
Model |
STR-P200 |
STR-P300 |
STR-P500 |
|
Central Emission wavelength (nm) |
1064 |
1064 |
1064 |
|
Nominal average output power (W) |
200@20-50kHz |
300@30-50kHz |
500@20-50kHz |
|
Nominal average output power (W) |
100@10kHz |
250@20kHz |
200@10kHz |
|
Pulse repetition rate (kHz) |
10-50 |
20-50 |
10-50 |
|
Laser power stability (8hrs) |
<5% |
<5% |
<5% |
|
Polarisation |
Random |
Random |
Random |
|
Pulse width (ns) |
90-130 |
120-140 |
80-160 |
|
Maximum Pulse energy (mJ) |
10@20kHz |
12.5@20kHz |
25@20kHz |
|
Fiber core dia. (um) |
100 |
100 |
200 |
|
Fiber length (m) |
5.0 |
5.0 |
10.0 |
|
Output power tunability (%) |
10-100 |
10-100 |
10-100 |
|
Operating voltage |
220VAC |
220VAC |
220VAC |
|
Cooling |
Air |
Water |
Water |
|
Operating temperature (oC) |
0-40 |
0-40 |
0-40 |
|
Dimension WxDxH (mm) |
485x237x764 |
485x237x764 |
502x254x755 |
The MOPA pulsed fiber lasers have the features such as high average power (20-200W), high peak power (15kW), tunable pulse widths from 2ns to 500ns and as high pulse repetition rate as 2000kHz. These lasers are ideal for applications such as solar , film cutting, thin material cutting, high resolution marking etc.
Technical specifications:
|
Model |
STR-P20MB |
STR-P60M |
STR-P100M |
|
Central Emission wavelength (nm) |
1064 |
1064 |
1064 |
|
Polarization |
Random |
Random |
Random |
|
Nominal average output power (W) |
20 |
60 |
100 |
|
Maximum Pulse energy (mJ) |
0.5 |
1.0 |
1.0 |
|
Pulse repetition rate (kHz) |
10-1000 |
20-1000 |
20-1000 |
|
Pulse width (ns) |
2-350 |
10-350 |
10-350 |
|
Typical beam quality (M2) |
<1.3 |
<1.6 |
<1.6 |
|
Collimated beam diameter (mm) |
6-8 |
6-8 |
5.5-7.5 |
|
Output power tunability (%) |
10-100 |
10-100 |
10-100 |
|
Long term power stability (8hrs) |
<3% |
<3% |
<5% |
|
Length of beam delivery fiber (m) |
2.0 |
2.0 |
2.0 |
|
Operating voltage |
24VDC |
24VDC |
220VAC |
|
Typical power consumption (W) |
150 |
350 |
450 |
|
Cooling |
Air |
Air |
Air |
|
Operating temperature (oC) |
0-40 |
0-40 |
0-40 |
|
Dimension WxDxH (mm) |
286x215x95 |
340x260x120 |
396x360x123 |
STJ-LP-Series Fiber Lasers adopts MOPA (Master Oscillator Power Amplifier) structure, diode laser as seed light, and fiber based power amplification. This laser integrates independence adjustment of pulse width and frequency, to make sure a constant pulse energy output, which provides a good combining solution to the requirements of high power laser source and high marking speed.
The extremely flexible pulse width and frequency adjustment, which plays a significant impact on colour formation, enables colour or silver shining marking on stainless steel.
Features:
Flexible & independent control of pulse width & frequency
Selectable pulse shape
High repetition frequency
No laser leakage
Applications:
Marking / Colour marking
Ablation
Cutting
Drilling
Scribing
Soldering
Trimming
Engraving
Technical specifications:
|
Model |
STJ-LP-20 |
STJ-LP-30 |
STJ-LP-60 |
STJ-LP-100 |
|
M2 |
< 1.3 |
< 1.8 |
||
|
Output cable length (m) |
2 |
3 |
||
|
Average output power (W) |
> 20 |
> 30 |
> 60 |
> 100 |
|
Maximum pulse energy (mJ) |
0.8 |
1.2 |
||
|
Pulse repetition rate at Maximum power (kHz) |
25~ 400 |
37 ~ 400 |
50 ~ 400 |
83 ~ 400 |
|
Pulse repetition rate (kHz) |
1 ~ 400 |
|||
|
Pulse width (ns) |
200 |
250 |
||
|
Output power stability (%) |
< 5 |
|||
|
Cooling |
Air |
|||
|
Power supply (V) |
24 |
|||
|
Current (A) |
< 8 |
< 10 |
< 15 |
< 20 |
|
Maximum power consumption (W) |
120 |
140 |
300 |
450 |
|
Central wavelength (nm) |
1064 |
|||
|
Pulse width @3dB (ns) |
< 15 |
|||
|
Polarization |
Random |
|||
|
Resist of high reflection |
Yes |
|||
|
Beam diameter (mm) |
7±0.5 |
6±0.5 |
||
|
Power range (%) |
0 ~ 100 |
|||
|
Operation temperature (°C) |
0 ~ 40 |
|||
|
Storage temperature (°C) |
-10 ~ 60 |
|||
|
Weight (kg) |
8 |
10 |
13.4 |
|
|
Size (mm) |
isolator: 42.5x42.4x262.5 |
315×275×99 |
337×278×120 |
|
STJ-M7 series high power pulsed fiber lasers make use of master oscillator power amplifier (MOPA) configuration, and show excellent laser performance as well as high level of temporal pulse shaping controllability. As compared to the Q-switching technology, the pulse repetition frequency (PRF) and pulse width can be controlled independently in MOPA configuration, through adjusting different combination of the above parameters, the peak power of laser can be well maintained. These lasers are suitable for more material processing which Q-switch limited. The higher output power makes its advantages especially in high speed marking applications.
Scribing, drilling
Surface treatment
Sheet metal cutting, welding
Marking on fly
Metal surface processing, peeling coating
|
Product number |
|
STJ-M7-20-SR |
STJ-M7-30-SR |
|
M2 |
|
<1.3 |
<1.3 |
|
Delivery Cable Length |
m |
2 |
2 |
|
Nominal Average Output Power |
W |
>20 |
>30 |
|
Maximum Pulse Energy |
mJ |
0.8 |
0.8 |
|
Pulse Repetition Rate Range |
kHz |
1 ~ 4000 |
1 ~ 4000 |
|
Pulse Duration |
ns |
2 ~ 350 |
2 ~ 350 |
|
Output Power Stability |
% |
<5 |
<5 |
|
Cooling Method |
|
Air |
Air |
|
Supply DC Voltage (VDC) |
V |
24 |
0.8 |
|
Current Consumption |
A |
<5 |
<6 |
|
Environmental Supply Current |
A |
>5 |
>6 |
|
Power@20℃ |
W |
<120 |
<144 |
|
Central Emission Wavelength |
nm |
1064 |
1064 |
|
Emission Bandwidth@3dB |
nm |
<15 |
<15 |
|
Polarization |
|
Random |
Random |
|
Output Beam Diameter |
mm |
7±0.5 |
7±0.5 |
|
Output Power Tuning Range |
% |
0 ~ 100 |
0 ~ 100 |
|
Operation Temperature |
℃ |
0 ~ 40 |
0 ~ 40 |
|
Storage Temperature |
℃ |
-10 ~ 60 |
-10 ~ 60 |
|
Weight |
kg |
4.4 |
4.5 |
|
Size(L×W×H) |
mm |
245 × 200 × 65 |
245 × 200 × 65 |
|
Product Number |
|
STJ-M7-60-L1-R |
STJ-M7-80-L1-R |
STJ-M7-100-L1-R |
STJ-M7-120-L1-R |
|
M2 |
|
<1.8 |
<1.8 |
<1.8 |
<1.8 |
|
Delivery Cable Length |
m |
3 |
3 |
3 |
3 |
|
Nominal Average Output Power |
W |
>60 |
>80 |
>100 |
>120 |
|
Maximum Pulse Energy |
mJ |
1.5 |
2.0 |
1.5 |
1.5 |
|
Pulse Repetition Rate Range |
kHz |
1 ~ 4000 |
1 ~ 4000 |
1 ~ 4000 |
1 ~ 4000 |
|
Pulse Duration |
ns |
2~500 |
2~500 |
2~500 |
2~500 |
|
Output Power Stability |
% |
<5 |
<5 |
<5 |
<5 |
|
Cooling Method |
|
Air Cooled |
Air Cooled |
Air Cooled |
Air Cooled |
|
Supply DC Voltage (VDC) |
V |
48 |
48 |
48 |
48 |
|
Current Consumption |
A |
<6 |
<7 |
<8 |
<9 |
|
Environmental Supply Current |
A |
>6 |
>7 |
>8 |
>9 |
|
Power@20℃ |
W |
<260 |
<300 |
<400 |
<450 |
|
Central Emission Wavelength |
nm |
1064 |
1064 |
1064 |
1064 |
|
Emission Bandwidth@3dB |
nm |
<15 |
<15 |
<15 |
<15 |
|
Polarization |
|
Random |
Random |
Random |
Random |
|
Output Beam Diameter |
mm |
7±0.5 |
7±0.5 |
7±0.5 |
7±0.5 |
|
Output Power Tuning Range |
% |
0 ~ 100 |
0 ~ 100 |
0 ~ 100 |
0 ~ 100 |
|
Operation Temperature |
℃ |
0 ~ 40 |
0 ~ 40 |
0 ~ 40 |
0 ~ 40 |
|
Storage Temperature |
℃ |
-10 ~ 60 |
-10 ~ 60 |
-10 ~ 60 |
-10 ~ 60 |
|
N.W |
KG |
8.5 |
8.5 |
13.2 |
13.2 |
|
Size(L×W×H) |
mm |
325 × 260 × 75 |
325 × 260 × 75 |
350 × 280 × 112 |
350 × 280 × 112 |
|
Product Number |
|
STJ-M7-150-L1-R |
STJ-M7-200-L1-R |
|
M2 |
|
<1.8 |
<1.8 |
|
Delivery Cable Length |
m |
5 |
5 |
|
Nominal Average Output Power |
W |
>150 |
>200 |
|
Maximum Pulse Energy |
mJ |
1.5 |
1.5 |
|
Pulse Repetition Rate Range |
kHz |
1 ~ 4000 |
1 ~ 4000 |
|
Pulse Duration |
ns |
4 ~ 500 |
8 ~ 500 |
|
Output Power Stability |
% |
<5 |
<5 |
|
Cooling Method |
|
Air Cooled |
Air Cooled |
|
Supply DC Voltage (VDC) |
V |
48 |
48 |
|
Current Consumption |
A |
<12 |
<16 |
|
Environmental Supply Current |
A |
>12 |
>16 |
|
Power@20℃ |
W |
<600 |
<800 |
|
Central Emission Wavelength |
nm |
1064 |
1064 |
|
Emission Bandwidth@3dB |
nm |
<20 |
<20 |
|
Polarization |
|
Random |
Random |
|
Output Beam Diameter |
mm |
7±0.5 |
7±0.5 |
|
Output Power Tuning Range |
% |
0 ~ 100 |
0 ~ 100 |
|
Operation Temperature |
℃ |
0 ~ 40 |
0 ~ 40 |
|
Storage Temperature |
℃ |
-10 ~ 60 |
-10 ~ 60 |
|
N.W |
KG |
24.8 |
24.8 |
|
Size(L×W×H) |
mm |
430 ×351× 133 |
430 ×351× 133 |
We offer fiber lasers with compact OEM modular design which is ideal for systems integration. They are widely used in communication, lidar, medical cosmetology, optical instrument, interference, holography, spectrum analysis, pump source, measurement, physics experiment, etc. The 1550 nm and 1064nm fiber laser are in single longitudinal and polarized mode. The pulsed mode up to 1MHz modulation and pulse duration variation are also available.
|
Model |
Wavelength (nm) |
Output power (mW) |
Pulse width |
Modulation rate |
Longitudinal mode |
Polarization |
|
STC-FL-266-PS |
266 |
1-10 |
<10 ps |
20-60 MHz |
Multi- |
>15dB |
|
STC-FL-343-PS |
343 |
1-50 |
<10 ps |
20-50 MHz |
Multi- |
>15dB |
|
STC-FL-355-PS |
355 |
1-50 |
<10 ps |
20-60 MHz |
Multi- |
>15dB |
|
STC-FL-515-PS |
515 |
1-200 |
<10 ps |
20-50 MHz |
Multi- |
>15dB |
|
STC-FL-532-PS |
532 |
1-150 |
<10 ps |
20-60 MHz |
Multi- |
>15dB |
|
STC-FL-1030-PS |
1030 |
1-2000 |
<10 ps |
20-50 MHz |
Multi- |
Random/ >15dB |
|
STC-FL-1030-PS-Seed |
1030 |
0.5-1 |
<10 ps |
20-50 MHz |
Multi- |
Random/ >15dB |
|
STC-FL-1064-PS |
1064 |
1-2000 |
<10 ps |
20-60 MHz |
Multi- |
Random/ >15dB |
|
STC-FL-1064-PS-Seed |
1064 |
0.5-1 |
<10 ps |
20-60 MHz |
Multi- |
Random/ >15dB |
|
STC-FL-266-Pico |
266 |
1-50 |
100-900 ps |
0.1-20 MHz |
Multi- |
>15dB |
|
STC-FL-343-Pico |
343 |
1-50 |
100-900 ps |
0.1-20 MHz |
Multi- |
>15dB |
|
STC-FL-355-Pico |
355 |
1-50 |
100-900 ps |
0.1-20 MHz |
Multi- |
>15dB |
|
STC-FL-515-Pico |
515 |
1-1000 |
100-900 ps |
0.1-20 MHz |
Multi- |
>15dB |
|
STC-FL-532-Pico |
532 |
1-1000 |
100-900 ps |
0.1-20 MHz |
Multi- |
>15dB |
|
STC-FL-535-Pico |
535 |
1-1000 |
100-900 ps |
0.1-20 MHz |
Multi- |
>15dB |
|
STC-FL-1030-Pico |
1030 |
10-5000 |
100-900 ps |
0.1-20 MHz |
Multi- |
Random/ >15dB |
|
STC-FL-1064-Pico |
1064 |
10-5000 |
100-900 ps |
0.1-20 MHz |
Multi- |
Random/ >15dB |
|
STC-FL-1070-Pico |
1070 |
10-5000 |
100-900 ps |
0.1-20 MHz |
Multi- |
Random/ >15dB |
|
STC-FL-1030-S |
1030 |
1 uW-200 mW |
5-100 ns |
1 Hz-10 MHz |
Multi- |
Random/ >15dB |
|
STC-FL-1064-S |
1064 |
1 uW-500 mW |
5-100 ns |
1 Hz-10 MHz |
Multi- |
Random/ >15dB |
|
STC-FL-1550-S |
1550 |
1uW-10 mW |
5-100 ns |
1 Hz-10 MHz |
Multi- |
Random/ >15dB |
|
STC-FL-266-Nano |
266 |
1-50 |
0.5-50 ns |
0.1-1 MHz |
Multi- |
>15dB |
|
STC-FL-343-Nano |
343 |
10-300 |
0.5-50 ns |
0.1-1 MHz |
Multi- |
>15dB |
|
STC-FL-355-Nano |
355 |
1-300 |
0.5-50 ns |
0.1-1 MHz |
Multi- |
>15dB |
|
STC-FL-515-Nano |
515 |
1-1000 |
0.5-50 ns |
0.1-1 MHz |
Multi- |
>15dB |
|
STC-FL-532-Nano |
532 |
1-1000 |
0.5-50 ns |
0.1-1 MHz |
Multi- |
>15dB |
|
STC-FL-535-Nano |
535 |
1-1000 |
0.5-50 ns |
0.1-1 MHz |
Multi- |
>15dB |
|
STC-FL-1030-Nano |
1030 |
0.5-10 W |
0.5-250 ns |
0.1-1 MHz |
Multi- |
Random/ >15dB |
|
STC-FL-1064-Nano |
1064 |
1000-5000 |
0.5-250 ns |
0.1-1 MHz |
Multi- |
Random/ >15dB |
|
STC-FL-1070-Nano |
1070 |
0.5-10 W |
0.5-250 ns |
0.1-1 MHz |
Multi- |
Random/ >15dB |
|
STC-FL-1550-Nano |
1550 |
50-1000 |
0.5-50 ns |
50-1000 kHz |
Multi- |
Random/ >15dB |
|
STC-FL-532-AO |
532 |
10-100 nJ |
0.5-50 ns |
1-1000 Hz |
Multi- |
Random/ >15dB |
|
STC-FL-1064-AO |
1064 |
1-20 uJ |
0.5-50 ns |
1-1000 Hz |
Multi- |
Random/ >15dB |
|
STC-FL-1550-AO |
1550 |
1-20 uJ |
0.5-50 ns |
1-200 Hz |
Multi- |
Random/ >15dB |
|
STC-FL-1064-CW |
1064 |
1-20 W |
N/A |
CW/ modulated |
Multi- |
Random/ >15dB |
|
STC-FL-1080-CW |
1080 |
1-20 W |
N/A |
CW/ modulated |
Multi- |
Random/ >15dB |
|
STC-FL-1550-CW |
1550 |
1-20 W |
N/A |
CW/ modulated |
Multi- |
Random/ >15dB |
|
STC-FL-1064-SF |
1064 |
1-500 |
N/A |
CW |
Single |
>15dB |
|
STC-FL-1550-SF |
1550 |
1-1000 |
N/A |
CW |
Single |
>15dB |
775nm pulsed fiber of Nanosecond Pulsed Fiber Lasers have been designed to allow users flexibility in their application refinement. With user selectable pulse-widths and repetition rates, these lasers put more options into the hands of the user than traditional lasers with fixed parameters. In addition, the ability to externally trigger pulses on some of the models make these laser an extremely flexible tool.
Based on an all-fiber laser cavity design and offering excellent beam quality and wall plug efficiency, these compact air-cooled lasers are an ideal choice for your application.
Repetition Rate: 20 - 40 MHz*
Average Power Stability: < 3%
Pulse to Pulse Stability:<5%
Features
All -fiber laser cavity
Excellent beam quality
High wall plug efficiency
Graphical User Interface
Highly reliable, maintenance free
Safety interlock
Compact & air-cooled
Applications
Structured Illumination Microscopy
Super Resolution Microscopy
3rd Generation DNA Sequencing
Entertainment
Military, and Scientific Research
|
|
Wavelength |
Energy/Pulse |
Pulse duration** |
|
External or Internal Triggering |
1028, 1064, 1550 nm |
100 nJ |
1.5 - 4 ns |
|
External or Internal Triggering |
514, 532 nm |
50 nJ |
1.3 - 4 ns |
|
External or Internal Triggering |
775 nm |
30 nJ |
1.3 - 4 ns |
|
Internal Triggering |
1120, 1240 nm |
60 nJ |
1.1 - 4 ns |
|
Internal Triggering |
560, 620 nm |
10 nJ |
0.5 - 2 ns |
* Other repetition rates custom
** Other models available
We also provide beam combiner modules (or called as red aiming module), which is designed for the use with the fiber lasers (or Nd:YAG lasers etc). Inside there is a beam combiner. A red diode is vertically fixed and the fiber laser beam horizontally goes through the module.
The beam combiner module STM-1064/650 is designed for combining 1064nm and 650nm laser beams. The matched red diode is ST-SD650-5G1 and the beam combiner is the diemsnion Φ20x1.5mm (or Φ20x2mm, Φ20x3mm etc) such as STJ-1064-BC-20-2. For other laser wavelengths, just select other beam combiners and the beam combiner modules at other wavelengths are available upon request. Please contact us for more information.
A leading supplier and manufacturer of a wide range of photonics products such as lasers,laser parts & machines.
Office: 18 South Liu Fang Yuan Road,Sintec Industrial Park, Wuhan Hubei, 430205 PR China
Tel: 18162698939
Fax: +86 27 51858989
QQ: 1392360513
Email: sales@SintecOptronics.cn
We always use our company's email boxes for business communication and never use any free-emails such as yahoo, hotmail, gmail etc. If you receive any email without our domain, please confirm with us via phone or wechat.
