Mid-infrared lasers operating near 3 µm are a subject of considerable research effort in recent years. The main reason is the broad range of potential applications for such sources in the field of medicine, environmental monitoring and free space communication. For many applications pulsed mid-infrared light sources with high output energy, short pulse duration (to reduce the impact of thermal background) and good pulse-to-pulse stability are preferred. A promising candidate for such pulsed light sources is a mid-infrared fiber laser realised using fluoride glass fibers doped with rare earth ions (for example erbium or dysprosium). In this contribution pulsed operation was obtained by implementing the Q-switching technique in a laser setup consisting of a fluoride fiber pumped with near infrared laser diodes. The obtained pulses have output energy above 100 µJ, with pulse width below 50 ns and repetition rate in the kilohertz range.
In this contribution experimental investigation of acousto-optically Q-switched erbium-doped fluorozirconate fiber laser is presented. Under the repetition rate of 1 kHz laser produces pulses with the shortest duration of 20 ns and the maximum pulse energy of 180 μJ, corresponding to a maximum peak power of 9 kW.
In this paper the hybrid wireless and fiber optic sensor system based on a fiber Bragg grating (FBG), ZigBee IEEE 802.15.4 and Radio over Fiber (RoF) has been presented. The sensor monitoring system generally consists of FBG-based temperature sensor integrating with ZigBee End Point, RoF modules and ZigBee Coordinator connected to the Managing Computer. The FBG-based sensor has been entirely demonstrated. It relies on conversion of a Bragg wavelength shift into a change of detected optical power. If the FBG spectrum is located on the spectral slope of light source, the Bragg wavelength shift implies the change of reflected optical power. Due to the distance, during the experiment ZigBee End Point and ZigBee Coordinator could not communicate. Thus, the RoF modules and single mode fiber have been applied in order to overcome the communication problems. By dint of this method information from FBG-based sensor could be transmitted to ZigBee Coordinator. Presented sensor system is easily applicable and prepared for another measurements. There are several advantages of FBG-based sensors, for instance: lightness, immunity to electromagnetic interferences or ability to long-term working. Moreover, the connection between optical fiber transmission and wireless communication ensures high flexibility and scalability. Thus, demonstrated sensor system could be applied at places with limited access.
This paper presents investigation of normal and cancerous tissue by the means of one and two photon fluorescence spectroscopy. A comparison those methods has been conducted, allowing for eventual determination of granting the best possible diagnostic results.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.