Passively Q-switched mode-locking of Tm:YAP laser based on Cr:ZnS saturable absorber

Abstract

Using a Cr:ZnS wafer as the saturable absorber, diode-pumped passively Q-switched mode-locking of a Tm:YAP laser at 1976 nm has been realized for the first time, to the best of our knowledge, and nearly 100% modulation depth of Q-switched mode-locking was achieved. The width of the mode-locked pulse was estimated to be about 980 ps with a repetition rate of 350 MHz within a roughly 300-ns-long Q-switched pulse envelope. A maximum output power of 940 mW was obtained, corresponding to the Q-switched pulse energy of 0.55 mJ. The emission wavelength evolution between the continuous-wave and Q-switched mode-locked operations was presented and discussed. The experimental results indicate that the Cr:ZnS absorber is a promising saturable absorber for passively Q-switched mode-locking operation around 2 μm.

ZnS Nanospheres for Optical Modulator in an Erbium‐Doped Fiber Laser

“…Up to now, the synthesis methods of ZnS include liquid phase method, solid phase method, gas phase method, etc. Due to its infrared transparency, fluorescence, phosphor, and other characteristics, ZnS nanospheres exhibit a quantum constraint effect when its radius is smaller than the exciton Bohr radius, resulting in blue shift of absorption spectrum and high efficiency fluorescence characteristics, which can be applied in a new generation of high‐performance photoelectric sensors and monitors …”

A solid-state passively Q-switched Tm,Gd:CaF2laser with a Ti3C2TxMXene absorber near 2µm

“…As we know, one of the important ways to achieve 2 µm pulsed laser output is passive Q-switching based on a saturable absorber (SA). In the past, Cr:ZnSe [4] and Cr:ZnS [5] have been widely employed as SAs to generate passively Q-switched lasers for 2 µm. But, the shortcomings of band selectivity and high-cost limit their long-term development [6].…”

“…In recent years, a new type of SA, two-dimensional (2D) materials, such as graphene, transition metal dichalcogenides, black phosphorus and so on, have been extensively reported Laser Physics Letters A solid-state passively Q-switched Tm,Gd:CaF 2 laser with a Ti 3 C 2 T x MXene absorber near 2 µm Yuqian Zu 1 , Cheng Zhang 1 , Xinsheng Guo 2 , Weiyuan Liang 3 , Jie Liu 1,5,6 , Liangbi Su 2,4 and Han Zhang 3 because they possess a wide absorption spectrum range, significant saturable absorption capacity, and are low-cost [7][8][9][10][11]. The emergence of 2D materials brings a promising prospect to 2 µm pulsed lasers [12][13][14][15][16][17].…”

Passively Q-switched mode-locked Ho,Pr:LiLuF4 laser operating at 2.9 µm with semiconductor saturable absorber mirror

“…For QML operation, owing to the lack of a MIR autocorrelator, we referred to the relevant calculation methods and utilized the large bandwidth of the oscilloscope and detector to make an approximate estimate of the pulse width of the QML pulse using the following formula: [26][27][28][29][30][31]…”