Key Parameter
Built-in mechanisms
● Peltier and thermistor for crystal temperature control
● SWPF filter for fundamental wave cutting
● PD for switching light intensity monitoring
Options
● Fiber laser source for each wavelength
● Crystal temperature regulation control driver (external)
● Safety shutter (external)
● AOM (external)
Currently supports wavelength conversion | 1178nm→589nm，1064nm→532nm，1590nm→795nm,1560→780nm，1160nm-580nm，1550nm-775nm,1396nm-698nm,1018nm-509nm |
Output level* | Up to 1-W level (Free space output) |
Output form | Collimated light or optical fiber |
Beam quality | Space single mode, TEM 00, M 2 ≤ 1. 1 |
(T*The output level can change according to the characteristics of the input fundamental wave laser (power, line width, etc.)
Title | Parameter Free space output | Parameters (fiber coupled output) |
Order Part Number | WH-0780-000-A-B-C (space out) | WH-0780-000-F-B-C (fiber out) |
Required pump wavelength | 1560 nm | 1560 nm |
Frequency multiplication target wavelength | 780 nm | 780 nm |
Frequency multiplication efficiency | > 50 %/W
When pump power is below 100 mW | > 25%/W
When pump power is below 100 mW |
Operating temperature (Top) | Typ.: > 30 degree C
Temperature fine tuning is required. | Typ.: > 30 degree C
Temperature fine tuning is required. |
thermal resistor | B = 3450 | B = 3450 |
TEC current | 2 A max | 2 A max |
Title | Parameter Free space output | Parameters (fiber coupled output) |
Order Part Number | WH-078-000-A-B-C(space out) | WH-0780-000-F-B-C(Fiber out) |
Module dimensions | 54 mm x 30 mm x 11.2 mm | 54 mm x 30 mm x 11.2 mm |
Output window | IR-cut filter | none |
Input optical fiber | 1550 nm PANDA fiber with FC / APC connector | 1550 nm PANDA fiber with FC / APC connector |
Output optical fiber | Space out | 850 nm PANDA fiber with FC / APC connector |
Optical path diagram of PPLN frequency multiplication crystal
Take the following test: 1560→780nm as an example
First, select a 1560nm DFB semiconductor laser as the seed source and input it into the EDFA for optical amplification. The amplified fundamental frequency light is used as the pump source of the PPLN crystal, input from the input end of the crystal, and generates a multiplication frequency light of 780nm after passing through the PPLN. Before injecting the pump, you must first ensure that the temperature controller of the PPLN is working properly and the crystal has stabilized at the set temperature value.
The spectrum component of 780nm was tested by the spectrometer to confirm the frequency multiplication process. The spectrum is as follows:
By adjusting the working current of EDFA, we tested the frequency multiplication optical power change curve under different power fundamental frequency optical input. The higher the input power, the higher the frequency doubling efficiency.
Finally, we tested the power stability and frequency stability of the output frequency multiplication light, respectively, and verified the working stability of the PPLN crystal. These two indicators also depend on the noise of EDFA and DFB, and require a light source with lower noise for testing.
Power stability test
Note:
The waveguide needs to be properly heat-dissipated. It is recommended to install the waveguide on a heat sink. The contact surface between the waveguide and the heat sink should be coated with thermal conductive materials such as thermal grease. The recommended ambient operating temperature is 10~30℃. If it is not within this range, you need to perform secondary temperature control on the heat sink and set the temperature of the heat sink to about 20℃. It is strictly forbidden to operate without secondary temperature control in an environment higher than the waveguide matching temperature.
The matching temperature of the waveguide body must be within the range of 20~60℃.
First turn on the temperature control of the waveguide, wait for the temperature to stabilize, and then slowly increase the pump light. As the pump power increases, the optimal matching temperature of the waveguide will have a slight offset. At this time, fine-tune the waveguide temperature to maximize the frequency-doubled light modulation.
