Compact Narrow‑Linewidth Low‑Noise Seed Laser for Space

Yumeng Xu; Guofeng Xin; Dijun Chen; Guangwei Sun; Chenwen Hu; Yunjie Zhu; Li Tao; Xia Hou; Weibiao Chen

doi:10.3788/CJL241321

Chinese Journal of Lasers, Volume. 52, Issue 10, 1001004(2025)

Compact Narrow‑Linewidth Low‑Noise Seed Laser for Space

Yumeng Xu^*, Guofeng Xin^**, Dijun Chen, Guangwei Sun, Chenwen Hu, Yunjie Zhu, Li Tao, Xia Hou, and Weibiao Chen

Aerospace Laser Technology and Systems Department, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

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Abstract Get PDF(in Chinese)

Figures & Tables(16)

Fig. 1. Seed laser. (a) Structure diagram; (b) physical picture

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Fig. 2. Test results of welding strength of optical components

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Fig. 3. Output power and frequency of seed laser. (a) Output power of seed laser versus pump chip power; (b) output frequency of seed laser versus output power

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Fig. 4. Linewidth and frequency noise of seed laser. (a) Linewidth; (b) frequency noise

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Fig. 5. Relative intensity noise of seed laser

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Fig. 6. Output frequency of seed laser versus crystal temperature

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Fig. 7. Output frequency of seed laser versus PZT voltage

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Fig. 8. Changes in output power and wavelength of seed laser. (a) Change in power ; (b) change in wavelength

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Fig. 9. Schematic diagram of seed laser lifetime monitoring test platform

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Fig. 10. Normalized output power of seed laser versus acceleration life test time

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Fig. 11. Linewidth, frequency noise, and RIN of seed laser versus acceleration life test time. (a) Linewidth and frequency noise; (b) RIN

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Table 1. Temperature cycling test conditions
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Table 1. Temperature cycling test conditions
Parameter Content
Pressure
Atmospheric pressure，
filling nitrogen
Temperature /℃ -35‒+55
Temperature cycling number 100
Heating and cooling rates /（℃/min） 3‒5
Temperature retention time /h 2

Table 2. Mechanical test conditions

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Table 2. Mechanical test conditions

Random vibration test		Sinusoidal vibration test		Shock response spectrum
Parameter	Content	Parameter	Content	Parameter	Content
Power spectral density	0.36g²/Hz@ 100‒800 Hz	Magnitude	19.5g@15‒100 Hz	Shock spectrum acceleration （Q=10）	1600g@ 1500‒4000 Hz
Total root mean square acceleration	19.8g	Test direction	X， Y，Z	Test direction	X，Y，Z
Test direction	X， Y，Z	Scanning rate	2 otc/min	Test times	Three times in each direction
Test time	2 min in each direction			Test time	<20 ms

Table 3. Radiation test conditions
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Table 3. Radiation test conditions
Parameter Content
Radiation source Co-60
Total dose /krad 60
Dose rate /（rad/min） 333
Radiation time /min 180

Table 4. Thermal vacuum test conditions
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Table 4. Thermal vacuum test conditions
Parameter Content
Pressure /Pa ≤6.65×10^-3
Temperature /℃ -35‒+55
Temperature cycling number 7.5
Heating and cooling rates /（℃/min） 2

Table 5. Performance of seed lasers corresponding to main/backup pump chips

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Table 5. Performance of seed lasers corresponding to main/backup pump chips

Parameter	Value
Parameter	Main pump	Backup pump
Output power /mW	133.7	135.6
Output frequency /GHz	281645.315	281645.255
Linewidth /Hz	201	259
Frequency noise /（Hz/ $\sqrt[]{H z}$ ）（@10 kHz）	5.2	5.4
RIN/（dBc/Hz）（@100 MHz）	-170	-169
Temperature tuning range /GHz	44.97	42.55
PZT tuning range /MHz	315	305

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Yumeng Xu, Guofeng Xin, Dijun Chen, Guangwei Sun, Chenwen Hu, Yunjie Zhu, Li Tao, Xia Hou, Weibiao Chen. Compact Narrow‑Linewidth Low‑Noise Seed Laser for Space[J]. Chinese Journal of Lasers, 2025, 52(10): 1001004

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