Watt-level all-fiber optical parametric chirped-pulse amplifier working at 1300  nm

Design of multiphoton microendoscope system for minimally invasive detection of cancer

“…8 The laser used in the system is a custom-made fiber-based laser that has a 100 fs pulse duration, a 45 MHz rep rate, and a 160 mW average power. 7 The laser pulse is pre-chirped using a pair of volume holographic gratings to apply negative dispersion to account for the positive dispersion of the rest of the endoscope system. The laser center wavelength (CWL) is 1400 nm, its spectrum is shown in Figure 3.…”

“…Similarly, the 3PEF/THG signal is also further split by another dichroic filter (3), where the 3PEF signal passes through while the THG signal is deviated another 90 degrees. In front of each PMT there is final bandpass filter to ensure more efficient blocking of unwanted wavelengths (4,5,7,8), to assure an optical density (OD) >5 outside the bandwidth of interest. As our design was based on available off-the-shelf filters, there is still cross-contamination of SHG signal in the 2PEF channel, as the 2PEF channel transmits light within the SHG bandwidth.…”

“…𝑡𝑡 𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠 = 𝜔𝜔 𝑠𝑠 𝑎𝑎 𝑠𝑠 (7) This value and the user specified linear motor speed are then used to calculate the corresponding acceleration value for the linear motor (Equation 8).…”

All-fiber high-power 1700 nm femtosecond laser based on optical parametric chirped-pulse amplification

“…Notably, by using this approach, a constant relative phase relation can be maintained between signal/idler and pump, which is important for many applications. This approach has been used to generate high power ultrashort pulses at other difficult wavelengths to generate in fiber such as 1300 nm [28]. Compared to the other approaches, our FOPCPA uses a standard single mode dispersion-shifted fiber (DSF), as the wavelength conversion tool and the energy scalability is better than the Raman soliton technique.…”

Усиление Рамановских Диссипативных Солитонов В Фосфоросиликатных Оптических Волокнах

“…На сегодняшний день наблюдается повышенный интерес к ультракоротким импульсам на длинах волн в области 1.3 мкм, что связано с перспективами их применения для многофотонной микроскопии биологических объектов [1]. Существует несколько методов получения такого излучения: с помощью новых активных сред (висмут, празеодим) [2,3], с использованием параметрических усилителей [4], а также посредством генерации рамановских диссипативных солитонов (РДС) в фосфоросиликатных оптических волокнах [5]. Ранее нами была показана возможность генерации импульсов с несущей длиной волны вблизи 1.3 мкм и энергией до 2.5 нДж во внешнем резонаторе.…”