Strain compensated robust semiconductor saturable absorber mirror for fiber lasers

Yan Wang; Nan Lin; Wanli Gao; Huanyu Song; Minglie Hu; Haiming Li; Wenxia Bao; Xiaoyu Ma; Zhigang Zhang

doi:doi:10.3788/COL201917.071404

Chinese Optics Letters, 2019, 17 (7): 071404, Published Online: Jul. 9, 2019

Strain compensated robust semiconductor saturable absorber mirror for fiber lasers Download： 762次

Yan Wang ¹Nan Lin ²Wanli Gao ¹Huanyu Song ³Minglie Hu ³Haiming Li ⁴Wenxia Bao ⁴Xiaoyu Ma ²Zhigang Zhang ^1,*

Author Affiliations

¹ State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China

² National Research Center for Optoelectronic Engineering, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100871, China

³ Ultrafast Laser Laboratory, Key Laboratory of Opto-electronic Information Technical Science of Ministry of Education, School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China

⁴ Huakuai Photonic Technologies Inc., Zhongshan 528400, China

Figures & Tables

Fig. 1. Designed structure of the SESAM.

下载图片查看原文

Fig. 2. Experimental setup for characterization of the SESAM. Test laser, 1064 nm mode-locked fiber laser with a pulse energy of 5 μJ; $λ / 2$ , half-wave plate; $λ / 4$ , quarter-wave plate; PBS, polarization beam splitter; lens, with a 30 mm focal length.

下载图片查看原文

Fig. 3. Nonlinear reflectivity measurements for the SESAM under test. The reflectivity is fitted with Eq. (1).

下载图片查看原文

Fig. 4. Experimental setup of the mode-locked laser based on SESAM. Integrated SESAM including a 1064 nm collimator, a lens with a 15 mm focal length, and a SESAM mounted on a copper heat sink; Yb:fiber, Yb-doped fiber with an absorption coefficient of 5 dB/m at 975 nm; WDM, wavelength division multiplexer; FBG, fiber grating with a center wavelength of 1064 nm; diode laser, with a center wavelength at 975 nm.

下载图片查看原文

Fig. 5. Image of the integrated SESAM.

下载图片查看原文

Fig. 6. Pulse sequences from the SESAM mode-locked laser.

下载图片查看原文

Fig. 7. (a) Measured pulse spectrum of the pulse train from the laser oscillator. (b) Intensity autocorrelation trace of the pulse train. (c) Measurement of output power as a function of pump power.

下载图片查看原文

Table1. Derived SESAM Parameters

Parameters	Measured Results
Saturation fluence $F_{sat}$	$39.3 μJ / {cm}^{2}$
Saturated reflectivity $R_{ns}$	96.5%
Linear reflectivity $R_{lin}$	85.0%
Modulation depth $β$	11.5%
Non-saturable loss $1 - R_{ns}$	3.5%
Damage threshold $F_{d}$	$9.5 mJ / {cm}^{2}$
ISA coefficient $F_{2}$	$6.3 \times 10^{2} mJ / {cm}^{2}$

查看原文

Yan Wang, Nan Lin, Wanli Gao, Huanyu Song, Minglie Hu, Haiming Li, Wenxia Bao, Xiaoyu Ma, Zhigang Zhang. Strain compensated robust semiconductor saturable absorber mirror for fiber lasers[J]. Chinese Optics Letters, 2019, 17(7): 071404.