Mr. Yuji Yokoyama Profile

Yuji Yokoyama

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Development of the liquid nitrogen cooled hollow core waveguide fiber for the mid-infrared region

Yasuhiro Hirahara, Ryota Ito, Yuji Yokoyama, Yuji Matsuura, Takashi Katagiri, Hiromu Nakagawa, Yasumasa Kasaba, Atsushi Yamazaki

Proceedings Volume 11451, 114516C (2020) https://doi.org/10.1117/12.2561187

KEYWORDS: Liquids, Nitrogen, Waveguides, Mid-IR, Transmittance, Silver, Data modeling, Telescopes, Astronomy, Glasses

Read Abstract +

We report on the development of the liquid nitrogen cooled hollow core waveguide (HCW) applicable for guiding midinfrared light from telescopes to the cryogenically cooled instruments with high transmittance. We employed a commercially available HCW, 2-m in length, transmitting 8 < λ < 13 μm in wavelength (astronomical N-band), made of polyimide tube with inner diameter of 0.8mmφ coated with a thin glass clad with Ag coated with AgI. In the present study, we designed and fabricated a flexible triple tube capable of cooling the HCW with liquid nitrogen flow, preventing ambient water vapor condensation on both inner and outer surface. One end of the HCW was sealed with 2mmφ and 1mm thick AR-coated Ge window employed with a vacuum adhesive, while another end left open for evacuation inside the HCW. The transmittance of the liquid nitrogen cooled HCW was measured by using the light source: quantum cascade laser continuously oscillating at 10.4 μm in wavelength with ~50 mW, and a thermopile detector. We have found ~10% improvement of the transmittance at 77 K compared with the room temperature condition. The observed increase of HCW transmittance is in reasonable accordance with a theoretical prediction based on the Drude model and the experimental data for electrical conductivity of thin Ag film at low temperature.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

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.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

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.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years